Release v0.2.0v0.2.0

7 files changed, 2068 insertions, 0 deletions

diff --git a/src/org/unitConverter/converterGUI/DelegateListModel.java b/src/org/unitConverter/converterGUI/DelegateListModel.java
new file mode 100755
index 0000000..b80f63d
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/DelegateListModel.java
@@ -0,0 +1,242 @@
+/**
+ * Copyright (C) 2018 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+
+import javax.swing.AbstractListModel;
+
+/**
+ * A list model that delegates to a list.
+ * <p>
+ * It is recommended to use the delegate methods in DelegateListModel instead of the delegated list's methods because
+ * the delegate methods handle updating the list.
+ * </p>
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-01-14
+ * @since v0.1.0
+ */
+final class DelegateListModel<E> extends AbstractListModel<E> implements List<E> {
+	/**
+	 * @since 2019-01-14
+	 * @since v0.1.0
+	 */
+	private static final long serialVersionUID = 8985494428224810045L;
+
+	/**
+	 * The list that this model is a delegate to.
+	 * 
+	 * @since 2019-01-14
+	 * @since v0.1.0
+	 */
+	private final List<E> delegate;
+
+	/**
+	 * Creates an empty {@code DelegateListModel}.
+	 * 
+	 * @since 2019-04-13
+	 */
+	public DelegateListModel() {
+		this(new ArrayList<>());
+	}
+
+	/**
+	 * Creates the {@code DelegateListModel}.
+	 * 
+	 * @param delegate
+	 *            list to delegate
+	 * @since 2019-01-14
+	 * @since v0.1.0
+	 */
+	public DelegateListModel(final List<E> delegate) {
+		this.delegate = delegate;
+	}
+
+	@Override
+	public boolean add(final E element) {
+		final int index = this.delegate.size();
+		final boolean success = this.delegate.add(element);
+		this.fireIntervalAdded(this, index, index);
+		return success;
+	}
+
+	@Override
+	public void add(final int index, final E element) {
+		this.delegate.add(index, element);
+		this.fireIntervalAdded(this, index, index);
+	}
+
+	@Override
+	public boolean addAll(final Collection<? extends E> c) {
+		boolean changed = false;
+		for (final E e : c) {
+			if (this.add(e)) {
+				changed = true;
+			}
+		}
+		return changed;
+	}
+
+	@Override
+	public boolean addAll(final int index, final Collection<? extends E> c) {
+		for (final E e : c) {
+			this.add(index, e);
+		}
+		return !c.isEmpty(); // Since this is a list, it will always change if c has elements.
+	}
+
+	@Override
+	public void clear() {
+		final int oldSize = this.delegate.size();
+		this.delegate.clear();
+		if (oldSize >= 1) {
+			this.fireIntervalRemoved(this, 0, oldSize - 1);
+		}
+	}
+
+	@Override
+	public boolean contains(final Object elem) {
+		return this.delegate.contains(elem);
+	}
+
+	@Override
+	public boolean containsAll(final Collection<?> c) {
+		for (final Object e : c) {
+			if (!c.contains(e))
+				return false;
+		}
+		return true;
+	}
+
+	@Override
+	public E get(final int index) {
+		return this.delegate.get(index);
+	}
+
+	@Override
+	public E getElementAt(final int index) {
+		return this.delegate.get(index);
+	}
+
+	@Override
+	public int getSize() {
+		return this.delegate.size();
+	}
+
+	@Override
+	public int indexOf(final Object elem) {
+		return this.delegate.indexOf(elem);
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return this.delegate.isEmpty();
+	}
+
+	@Override
+	public Iterator<E> iterator() {
+		return this.delegate.iterator();
+	}
+
+	@Override
+	public int lastIndexOf(final Object elem) {
+		return this.delegate.lastIndexOf(elem);
+	}
+
+	@Override
+	public ListIterator<E> listIterator() {
+		return this.delegate.listIterator();
+	}
+
+	@Override
+	public ListIterator<E> listIterator(final int index) {
+		return this.delegate.listIterator(index);
+	}
+
+	@Override
+	public E remove(final int index) {
+		final E returnValue = this.delegate.get(index);
+		this.delegate.remove(index);
+		this.fireIntervalRemoved(this, index, index);
+		return returnValue;
+	}
+
+	@Override
+	public boolean remove(final Object o) {
+		final int index = this.delegate.indexOf(o);
+		final boolean returnValue = this.delegate.remove(o);
+		this.fireIntervalRemoved(this, index, index);
+		return returnValue;
+	}
+
+	@Override
+	public boolean removeAll(final Collection<?> c) {
+		boolean changed = false;
+		for (final Object e : c) {
+			if (this.remove(e)) {
+				changed = true;
+			}
+		}
+		return changed;
+	}
+
+	@Override
+	public boolean retainAll(final Collection<?> c) {
+		final int oldSize = this.size();
+		final boolean returnValue = this.delegate.retainAll(c);
+		this.fireIntervalRemoved(this, this.size(), oldSize - 1);
+		return returnValue;
+	}
+
+	@Override
+	public E set(final int index, final E element) {
+		final E returnValue = this.delegate.get(index);
+		this.delegate.set(index, element);
+		this.fireContentsChanged(this, index, index);
+		return returnValue;
+	}
+
+	@Override
+	public int size() {
+		return this.delegate.size();
+	}
+
+	@Override
+	public List<E> subList(final int fromIndex, final int toIndex) {
+		return this.delegate.subList(fromIndex, toIndex);
+	}
+
+	@Override
+	public Object[] toArray() {
+		return this.delegate.toArray();
+	}
+
+	@Override
+	public <T> T[] toArray(final T[] a) {
+		return this.delegate.toArray(a);
+	}
+
+	@Override
+	public String toString() {
+		return this.delegate.toString();
+	}
+}
diff --git a/src/org/unitConverter/converterGUI/FilterComparator.java b/src/org/unitConverter/converterGUI/FilterComparator.java
new file mode 100755
index 0000000..7b17bfc
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/FilterComparator.java
@@ -0,0 +1,129 @@
+/**

+ * Copyright (C) 2018 Adrien Hopkins

+ *

+ * This program is free software: you can redistribute it and/or modify

+ * it under the terms of the GNU Affero General Public License as published by

+ * the Free Software Foundation, either version 3 of the License, or

+ * (at your option) any later version.

+ *

+ * This program is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU Affero General Public License for more details.

+ *

+ * You should have received a copy of the GNU Affero General Public License

+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.

+ */

+package org.unitConverter.converterGUI;

+

+import java.util.Comparator;

+import java.util.Objects;

+

+/**

+ * A comparator that compares strings using a filter.

+ * 

+ * @author Adrien Hopkins

+ * @since 2019-01-15

+ * @since v0.1.0

+ */

+final class FilterComparator implements Comparator<String> {

+	/**

+	 * The filter that the comparator is filtered by.

+	 * 

+	 * @since 2019-01-15

+	 * @since v0.1.0

+	 */

+	private final String filter;

+	/**

+	 * The comparator to use if the arguments are otherwise equal.

+	 * 

+	 * @since 2019-01-15

+	 * @since v0.1.0

+	 */

+	private final Comparator<String> comparator;

+	/**

+	 * Whether or not the comparison is case-sensitive.

+	 * 

+	 * @since 2019-04-14

+	 * @since v0.2.0

+	 */

+	private final boolean caseSensitive;

+

+	/**

+	 * Creates the {@code FilterComparator}.

+	 * 

+	 * @param filter

+	 * @since 2019-01-15

+	 * @since v0.1.0

+	 */

+	public FilterComparator(final String filter) {

+		this(filter, null);

+	}

+

+	/**

+	 * Creates the {@code FilterComparator}.

+	 * 

+	 * @param filter

+	 *            string to filter by

+	 * @param comparator

+	 *            comparator to fall back to if all else fails, null is compareTo.

+	 * @throws NullPointerException

+	 *             if filter is null

+	 * @since 2019-01-15

+	 * @since v0.1.0

+	 */

+	public FilterComparator(final String filter, final Comparator<String> comparator) {

+		this(filter, comparator, false);

+	}

+

+	/**

+	 * Creates the {@code FilterComparator}.

+	 * 

+	 * @param filter

+	 *            string to filter by

+	 * @param comparator

+	 *            comparator to fall back to if all else fails, null is compareTo.

+	 * @param caseSensitive

+	 *            whether or not the comparator is case-sensitive

+	 * @throws NullPointerException

+	 *             if filter is null

+	 * @since 2019-04-14

+	 * @since v0.2.0

+	 */

+	public FilterComparator(final String filter, final Comparator<String> comparator, final boolean caseSensitive) {

+		this.filter = Objects.requireNonNull(filter, "filter must not be null.");

+		this.comparator = comparator;

+		this.caseSensitive = caseSensitive;

+	}

+

+	@Override

+	public int compare(final String arg0, final String arg1) {

+		// if this is case insensitive, make them lowercase

+		final String str0, str1;

+		if (this.caseSensitive) {

+			str0 = arg0;

+			str1 = arg1;

+		} else {

+			str0 = arg0.toLowerCase();

+			str1 = arg1.toLowerCase();

+		}

+

+		// elements that start with the filter always go first

+		if (str0.startsWith(this.filter) && !str1.startsWith(this.filter))

+			return -1;

+		else if (!str0.startsWith(this.filter) && str1.startsWith(this.filter))

+			return 1;

+

+		// elements that contain the filter but don't start with them go next

+		if (str0.contains(this.filter) && !str1.contains(this.filter))

+			return -1;

+		else if (!str0.contains(this.filter) && !str1.contains(this.filter))

+			return 1;

+

+		// other elements go last

+		if (this.comparator == null)

+			return str0.compareTo(str1);

+		else

+			return this.comparator.compare(str0, str1);

+	}

+}

diff --git a/src/org/unitConverter/converterGUI/GridBagBuilder.java b/src/org/unitConverter/converterGUI/GridBagBuilder.java
new file mode 100755
index 0000000..f1229b2
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/GridBagBuilder.java
@@ -0,0 +1,479 @@
+/**
+ * Copyright (C) 2018 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.awt.GridBagConstraints;
+import java.awt.Insets;
+
+/**
+ * A builder for Java's {@link java.awt.GridBagConstraints} class.
+ * 
+ * @author Adrien Hopkins
+ * @since 2018-11-30
+ * @since v0.1.0
+ */
+final class GridBagBuilder {
+	/**
+	 * The built {@code GridBagConstraints}'s {@code gridx} property.
+	 * <p>
+	 * Specifies the cell containing the leading edge of the component's display area, where the first cell in a row has
+	 * <code>gridx=0</code>. The leading edge of a component's display area is its left edge for a horizontal,
+	 * left-to-right container and its right edge for a horizontal, right-to-left container. The value
+	 * <code>RELATIVE</code> specifies that the component be placed immediately following the component that was added
+	 * to the container just before this component was added.
+	 * <p>
+	 * The default value is <code>RELATIVE</code>. <code>gridx</code> should be a non-negative value.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#gridy
+	 * @see java.awt.ComponentOrientation
+	 */
+	private final int gridx;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code gridy} property.
+	 * <p>
+	 * Specifies the cell at the top of the component's display area, where the topmost cell has <code>gridy=0</code>.
+	 * The value <code>RELATIVE</code> specifies that the component be placed just below the component that was added to
+	 * the container just before this component was added.
+	 * <p>
+	 * The default value is <code>RELATIVE</code>. <code>gridy</code> should be a non-negative value.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#gridx
+	 */
+	private final int gridy;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code gridwidth} property.
+	 * <p>
+	 * Specifies the number of cells in a row for the component's display area.
+	 * <p>
+	 * Use <code>REMAINDER</code> to specify that the component's display area will be from <code>gridx</code> to the
+	 * last cell in the row. Use <code>RELATIVE</code> to specify that the component's display area will be from
+	 * <code>gridx</code> to the next to the last one in its row.
+	 * <p>
+	 * <code>gridwidth</code> should be non-negative and the default value is 1.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#gridheight
+	 */
+	private final int gridwidth;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code gridheight} property.
+	 * <p>
+	 * Specifies the number of cells in a column for the component's display area.
+	 * <p>
+	 * Use <code>REMAINDER</code> to specify that the component's display area will be from <code>gridy</code> to the
+	 * last cell in the column. Use <code>RELATIVE</code> to specify that the component's display area will be from
+	 * <code>gridy</code> to the next to the last one in its column.
+	 * <p>
+	 * <code>gridheight</code> should be a non-negative value and the default value is 1.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#gridwidth
+	 */
+	private final int gridheight;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code weightx} property.
+	 * <p>
+	 * Specifies how to distribute extra horizontal space.
+	 * <p>
+	 * The grid bag layout manager calculates the weight of a column to be the maximum <code>weightx</code> of all the
+	 * components in a column. If the resulting layout is smaller horizontally than the area it needs to fill, the extra
+	 * space is distributed to each column in proportion to its weight. A column that has a weight of zero receives no
+	 * extra space.
+	 * <p>
+	 * If all the weights are zero, all the extra space appears between the grids of the cell and the left and right
+	 * edges.
+	 * <p>
+	 * The default value of this field is <code>0</code>. <code>weightx</code> should be a non-negative value.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#weighty
+	 */
+	private double weightx;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code weighty} property.
+	 * <p>
+	 * Specifies how to distribute extra vertical space.
+	 * <p>
+	 * The grid bag layout manager calculates the weight of a row to be the maximum <code>weighty</code> of all the
+	 * components in a row. If the resulting layout is smaller vertically than the area it needs to fill, the extra
+	 * space is distributed to each row in proportion to its weight. A row that has a weight of zero receives no extra
+	 * space.
+	 * <p>
+	 * If all the weights are zero, all the extra space appears between the grids of the cell and the top and bottom
+	 * edges.
+	 * <p>
+	 * The default value of this field is <code>0</code>. <code>weighty</code> should be a non-negative value.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#weightx
+	 */
+	private double weighty;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code anchor} property.
+	 * <p>
+	 * This field is used when the component is smaller than its display area. It determines where, within the display
+	 * area, to place the component.
+	 * <p>
+	 * There are three kinds of possible values: orientation relative, baseline relative and absolute. Orientation
+	 * relative values are interpreted relative to the container's component orientation property, baseline relative
+	 * values are interpreted relative to the baseline and absolute values are not. The absolute values are:
+	 * <code>CENTER</code>, <code>NORTH</code>, <code>NORTHEAST</code>, <code>EAST</code>, <code>SOUTHEAST</code>,
+	 * <code>SOUTH</code>, <code>SOUTHWEST</code>, <code>WEST</code>, and <code>NORTHWEST</code>. The orientation
+	 * relative values are: <code>PAGE_START</code>, <code>PAGE_END</code>, <code>LINE_START</code>,
+	 * <code>LINE_END</code>, <code>FIRST_LINE_START</code>, <code>FIRST_LINE_END</code>, <code>LAST_LINE_START</code>
+	 * and <code>LAST_LINE_END</code>. The baseline relative values are: <code>BASELINE</code>,
+	 * <code>BASELINE_LEADING</code>, <code>BASELINE_TRAILING</code>, <code>ABOVE_BASELINE</code>,
+	 * <code>ABOVE_BASELINE_LEADING</code>, <code>ABOVE_BASELINE_TRAILING</code>, <code>BELOW_BASELINE</code>,
+	 * <code>BELOW_BASELINE_LEADING</code>, and <code>BELOW_BASELINE_TRAILING</code>. The default value is
+	 * <code>CENTER</code>.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.ComponentOrientation
+	 */
+	private int anchor;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code fill} property.
+	 * <p>
+	 * This field is used when the component's display area is larger than the component's requested size. It determines
+	 * whether to resize the component, and if so, how.
+	 * <p>
+	 * The following values are valid for <code>fill</code>:
+	 *
+	 * <ul>
+	 * <li><code>NONE</code>: Do not resize the component.
+	 * <li><code>HORIZONTAL</code>: Make the component wide enough to fill its display area horizontally, but do not
+	 * change its height.
+	 * <li><code>VERTICAL</code>: Make the component tall enough to fill its display area vertically, but do not change
+	 * its width.
+	 * <li><code>BOTH</code>: Make the component fill its display area entirely.
+	 * </ul>
+	 * <p>
+	 * The default value is <code>NONE</code>.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 */
+	private int fill;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code insets} property.
+	 * <p>
+	 * This field specifies the external padding of the component, the minimum amount of space between the component and
+	 * the edges of its display area.
+	 * <p>
+	 * The default value is <code>new Insets(0, 0, 0, 0)</code>.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 */
+	private Insets insets;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code ipadx} property.
+	 * <p>
+	 * This field specifies the internal padding of the component, how much space to add to the minimum width of the
+	 * component. The width of the component is at least its minimum width plus <code>ipadx</code> pixels.
+	 * <p>
+	 * The default value is <code>0</code>.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#ipady
+	 */
+	private int ipadx;
+
+	/**
+	 * The built {@code GridBagConstraints}'s {@code ipady} property.
+	 * <p>
+	 * This field specifies the internal padding, that is, how much space to add to the minimum height of the component.
+	 * The height of the component is at least its minimum height plus <code>ipady</code> pixels.
+	 * <p>
+	 * The default value is 0.
+	 * 
+	 * @serial
+	 * @see #clone()
+	 * @see java.awt.GridBagConstraints#ipadx
+	 */
+	private int ipady;
+
+	/**
+	 * @param gridx
+	 *            x position
+	 * @param gridy
+	 *            y position
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder(final int gridx, final int gridy) {
+		this(gridx, gridy, 1, 1);
+	}
+
+	/**
+	 * @param gridx
+	 *            x position
+	 * @param gridy
+	 *            y position
+	 * @param gridwidth
+	 *            number of cells occupied horizontally
+	 * @param gridheight
+	 *            number of cells occupied vertically
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder(final int gridx, final int gridy, final int gridwidth, final int gridheight) {
+		this(gridx, gridy, gridwidth, gridheight, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE,
+				new Insets(0, 0, 0, 0), 0, 0);
+	}
+
+	/**
+	 * @param gridx
+	 *            x position
+	 * @param gridy
+	 *            y position
+	 * @param gridwidth
+	 *            number of cells occupied horizontally
+	 * @param gridheight
+	 *            number of cells occupied vertically
+	 * @param weightx
+	 * @param weighty
+	 * @param anchor
+	 * @param fill
+	 * @param insets
+	 * @param ipadx
+	 * @param ipady
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	private GridBagBuilder(final int gridx, final int gridy, final int gridwidth, final int gridheight,
+			final double weightx, final double weighty, final int anchor, final int fill, final Insets insets,
+			final int ipadx, final int ipady) {
+		super();
+		this.gridx = gridx;
+		this.gridy = gridy;
+		this.gridwidth = gridwidth;
+		this.gridheight = gridheight;
+		this.weightx = weightx;
+		this.weighty = weighty;
+		this.anchor = anchor;
+		this.fill = fill;
+		this.insets = (Insets) insets.clone();
+		this.ipadx = ipadx;
+		this.ipady = ipady;
+	}
+
+	/**
+	 * @return {@code GridBagConstraints} created by this builder
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagConstraints build() {
+		return new GridBagConstraints(this.gridx, this.gridy, this.gridwidth, this.gridheight, this.weightx,
+				this.weighty, this.anchor, this.fill, this.insets, this.ipadx, this.ipady);
+	}
+
+	/**
+	 * @return anchor
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getAnchor() {
+		return this.anchor;
+	}
+
+	/**
+	 * @return fill
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getFill() {
+		return this.fill;
+	}
+
+	/**
+	 * @return gridheight
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getGridheight() {
+		return this.gridheight;
+	}
+
+	/**
+	 * @return gridwidth
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getGridwidth() {
+		return this.gridwidth;
+	}
+
+	/**
+	 * @return gridx
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getGridx() {
+		return this.gridx;
+	}
+
+	/**
+	 * @return gridy
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getGridy() {
+		return this.gridy;
+	}
+
+	/**
+	 * @return insets
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public Insets getInsets() {
+		return this.insets;
+	}
+
+	/**
+	 * @return ipadx
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getIpadx() {
+		return this.ipadx;
+	}
+
+	/**
+	 * @return ipady
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public int getIpady() {
+		return this.ipady;
+	}
+
+	/**
+	 * @return weightx
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public double getWeightx() {
+		return this.weightx;
+	}
+
+	/**
+	 * @return weighty
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public double getWeighty() {
+		return this.weighty;
+	}
+
+	/**
+	 * @param anchor
+	 *            anchor to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setAnchor(final int anchor) {
+		this.anchor = anchor;
+		return this;
+	}
+
+	/**
+	 * @param fill
+	 *            fill to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setFill(final int fill) {
+		this.fill = fill;
+		return this;
+	}
+
+	/**
+	 * @param insets
+	 *            insets to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setInsets(final Insets insets) {
+		this.insets = insets;
+		return this;
+	}
+
+	/**
+	 * @param ipadx
+	 *            ipadx to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setIpadx(final int ipadx) {
+		this.ipadx = ipadx;
+		return this;
+	}
+
+	/**
+	 * @param ipady
+	 *            ipady to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setIpady(final int ipady) {
+		this.ipady = ipady;
+		return this;
+	}
+
+	/**
+	 * @param weightx
+	 *            weightx to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setWeightx(final double weightx) {
+		this.weightx = weightx;
+		return this;
+	}
+
+	/**
+	 * @param weighty
+	 *            weighty to set
+	 * @since 2018-11-30
+	 * @since v0.1.0
+	 */
+	public GridBagBuilder setWeighty(final double weighty) {
+		this.weighty = weighty;
+		return this;
+	}
+}
diff --git a/src/org/unitConverter/converterGUI/MutablePredicate.java b/src/org/unitConverter/converterGUI/MutablePredicate.java
new file mode 100644
index 0000000..e15b3cd
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/MutablePredicate.java
@@ -0,0 +1,70 @@
+/**
+ * Copyright (C) 2019 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.util.function.Predicate;
+
+/**
+ * A container for a predicate, which can be changed later.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-04-13
+ * @since v0.2.0
+ */
+final class MutablePredicate<T> implements Predicate<T> {
+	/**
+	 * The predicate stored in this {@code MutablePredicate}
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private Predicate<T> predicate;
+
+	/**
+	 * Creates the {@code MutablePredicate}.
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public MutablePredicate(final Predicate<T> predicate) {
+		this.predicate = predicate;
+	}
+
+	/**
+	 * @return predicate
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public final Predicate<T> getPredicate() {
+		return this.predicate;
+	}
+
+	/**
+	 * @param predicate
+	 *            new value of predicate
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public final void setPredicate(final Predicate<T> predicate) {
+		this.predicate = predicate;
+	}
+
+	@Override
+	public boolean test(final T t) {
+		return this.predicate.test(t);
+	}
+}
diff --git a/src/org/unitConverter/converterGUI/SearchBoxList.java b/src/org/unitConverter/converterGUI/SearchBoxList.java
new file mode 100644
index 0000000..1995466
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/SearchBoxList.java
@@ -0,0 +1,297 @@
+/**
+ * Copyright (C) 2019 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.function.Predicate;
+
+import javax.swing.JList;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTextField;
+
+/**
+ * @author Adrien Hopkins
+ * @since 2019-04-13
+ * @since v0.2.0
+ */
+final class SearchBoxList extends JPanel {
+
+	/**
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private static final long serialVersionUID = 6226930279415983433L;
+
+	/**
+	 * The text to place in an empty search box.
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private static final String EMPTY_TEXT = "Search...";
+
+	/**
+	 * The color to use for an empty foreground.
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private static final Color EMPTY_FOREGROUND = new Color(192, 192, 192);
+
+	// the components
+	private final Collection<String> itemsToFilter;
+	private final DelegateListModel<String> listModel;
+	private final JTextField searchBox;
+	private final JList<String> searchItems;
+
+	private boolean searchBoxEmpty = true;
+
+	// I need to do this because, for some reason, Swing is auto-focusing my search box without triggering a focus
+	// event.
+	private boolean searchBoxFocused = false;
+
+	private Predicate<String> customSearchFilter = o -> true;
+	private final Comparator<String> defaultOrdering;
+	private final boolean caseSensitive;
+
+	/**
+	 * Creates the {@code SearchBoxList}.
+	 * 
+	 * @param itemsToFilter
+	 *            items to put in the list
+	 * @since 2019-04-14
+	 */
+	public SearchBoxList(final Collection<String> itemsToFilter) {
+		this(itemsToFilter, null, false);
+	}
+
+	/**
+	 * Creates the {@code SearchBoxList}.
+	 * 
+	 * @param itemsToFilter
+	 *            items to put in the list
+	 * @param defaultOrdering
+	 *            default ordering of items after filtration (null=Comparable)
+	 * @param caseSensitive
+	 *            whether or not the filtration is case-sensitive
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public SearchBoxList(final Collection<String> itemsToFilter, final Comparator<String> defaultOrdering,
+			final boolean caseSensitive) {
+		super(new BorderLayout(), true);
+		this.itemsToFilter = itemsToFilter;
+		this.defaultOrdering = defaultOrdering;
+		this.caseSensitive = caseSensitive;
+
+		// create the components
+		this.listModel = new DelegateListModel<>(new ArrayList<>(itemsToFilter));
+		this.searchItems = new JList<>(this.listModel);
+
+		this.searchBox = new JTextField(EMPTY_TEXT);
+		this.searchBox.setForeground(EMPTY_FOREGROUND);
+
+		// add them to the panel
+		this.add(this.searchBox, BorderLayout.PAGE_START);
+		this.add(new JScrollPane(this.searchItems), BorderLayout.CENTER);
+
+		// set up the search box
+		this.searchBox.addFocusListener(new FocusListener() {
+			@Override
+			public void focusGained(final FocusEvent e) {
+				SearchBoxList.this.searchBoxFocusGained(e);
+			}
+
+			@Override
+			public void focusLost(final FocusEvent e) {
+				SearchBoxList.this.searchBoxFocusLost(e);
+			}
+		});
+
+		this.searchBox.addCaretListener(e -> this.searchBoxTextChanged());
+		this.searchBoxEmpty = true;
+	}
+
+	/**
+	 * Adds an additional filter for searching.
+	 * 
+	 * @param filter
+	 *            filter to add.
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public void addSearchFilter(final Predicate<String> filter) {
+		this.customSearchFilter = this.customSearchFilter.and(filter);
+	}
+
+	/**
+	 * Resets the search filter.
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public void clearSearchFilters() {
+		this.customSearchFilter = o -> true;
+	}
+
+	/**
+	 * @return this component's search box component
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	public final JTextField getSearchBox() {
+		return this.searchBox;
+	}
+
+	/**
+	 * @param searchText
+	 *            text to search for
+	 * @return a filter that filters out that text, based on this list's case sensitive setting
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	private Predicate<String> getSearchFilter(final String searchText) {
+		if (this.caseSensitive)
+			return string -> string.contains(searchText);
+		else
+			return string -> string.toLowerCase().contains(searchText.toLowerCase());
+	}
+
+	/**
+	 * @return this component's list component
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	public final JList<String> getSearchList() {
+		return this.searchItems;
+	}
+
+	/**
+	 * @return index selected in item list
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	public int getSelectedIndex() {
+		return this.searchItems.getSelectedIndex();
+	}
+
+	/**
+	 * @return value selected in item list
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public String getSelectedValue() {
+		return this.searchItems.getSelectedValue();
+	}
+
+	/**
+	 * Re-applies the filters.
+	 * 
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	public void reapplyFilter() {
+		final String searchText = this.searchBoxEmpty ? "" : this.searchBox.getText();
+		final FilterComparator comparator = new FilterComparator(searchText, this.defaultOrdering, this.caseSensitive);
+		final Predicate<String> searchFilter = this.getSearchFilter(searchText);
+
+		this.listModel.clear();
+		this.itemsToFilter.forEach(string -> {
+			if (searchFilter.test(string)) {
+				this.listModel.add(string);
+			}
+		});
+
+		// applies the custom filters
+		this.listModel.removeIf(this.customSearchFilter.negate());
+
+		// sorts the remaining items
+		this.listModel.sort(comparator);
+	}
+
+	/**
+	 * Runs whenever the search box gains focus.
+	 * 
+	 * @param e
+	 *            focus event
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private void searchBoxFocusGained(final FocusEvent e) {
+		this.searchBoxFocused = true;
+		if (this.searchBoxEmpty) {
+			this.searchBox.setText("");
+			this.searchBox.setForeground(Color.BLACK);
+		}
+	}
+
+	/**
+	 * Runs whenever the search box loses focus.
+	 * 
+	 * @param e
+	 *            focus event
+	 * @since 2019-04-13
+	 * @since v0.2.0
+	 */
+	private void searchBoxFocusLost(final FocusEvent e) {
+		this.searchBoxFocused = false;
+		if (this.searchBoxEmpty) {
+			this.searchBox.setText(EMPTY_TEXT);
+			this.searchBox.setForeground(EMPTY_FOREGROUND);
+		}
+	}
+
+	/**
+	 * Runs whenever the text in the search box is changed.
+	 * <p>
+	 * Reapplies the search filter, and custom filters.
+	 * </p>
+	 * 
+	 * @since 2019-04-14
+	 * @since v0.2.0
+	 */
+	private void searchBoxTextChanged() {
+		if (this.searchBoxFocused) {
+			this.searchBoxEmpty = this.searchBox.getText().equals("");
+		}
+		final String searchText = this.searchBoxEmpty ? "" : this.searchBox.getText();
+		final FilterComparator comparator = new FilterComparator(searchText, this.defaultOrdering, this.caseSensitive);
+		final Predicate<String> searchFilter = this.getSearchFilter(searchText);
+
+		// initialize list with items that match the filter then sort
+		this.listModel.clear();
+		this.itemsToFilter.forEach(string -> {
+			if (searchFilter.test(string)) {
+				this.listModel.add(string);
+			}
+		});
+
+		// applies the custom filters
+		this.listModel.removeIf(this.customSearchFilter.negate());
+
+		// sorts the remaining items
+		this.listModel.sort(comparator);
+	}
+}
diff --git a/src/org/unitConverter/converterGUI/UnitConverterGUI.java b/src/org/unitConverter/converterGUI/UnitConverterGUI.java
new file mode 100755
index 0000000..e258c6f
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/UnitConverterGUI.java
@@ -0,0 +1,827 @@
+/**
+ * Copyright (C) 2018 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.unitConverter.converterGUI;
+
+import java.awt.BorderLayout;
+import java.awt.GridLayout;
+import java.io.File;
+import java.math.BigDecimal;
+import java.math.MathContext;
+import java.text.DecimalFormat;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Predicate;
+
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
+import javax.swing.JComboBox;
+import javax.swing.JFormattedTextField;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JSlider;
+import javax.swing.JTabbedPane;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+
+import org.unitConverter.UnitsDatabase;
+import org.unitConverter.dimension.StandardDimensions;
+import org.unitConverter.dimension.UnitDimension;
+import org.unitConverter.unit.BaseUnit;
+import org.unitConverter.unit.NonlinearUnits;
+import org.unitConverter.unit.SI;
+import org.unitConverter.unit.Unit;
+import org.unitConverter.unit.UnitPrefix;
+
+/**
+ * @author Adrien Hopkins
+ * @since 2018-12-27
+ * @since v0.1.0
+ */
+final class UnitConverterGUI {
+	private static class Presenter {
+		/**
+		 * Adds default units and dimensions to a database.
+		 * 
+		 * @param database
+		 *            database to add to
+		 * @since 2019-04-14
+		 * @since v0.2.0
+		 */
+		private static void addDefaults(final UnitsDatabase database) {
+			database.addUnit("metre", SI.METRE);
+			database.addUnit("kilogram", SI.KILOGRAM);
+			database.addUnit("gram", SI.KILOGRAM.dividedBy(1000));
+			database.addUnit("second", SI.SECOND);
+			database.addUnit("ampere", SI.AMPERE);
+			database.addUnit("kelvin", SI.KELVIN);
+			database.addUnit("mole", SI.MOLE);
+			database.addUnit("candela", SI.CANDELA);
+			database.addUnit("bit", SI.SI.getBaseUnit(StandardDimensions.INFORMATION));
+			database.addUnit("unit", SI.SI.getBaseUnit(UnitDimension.EMPTY));
+			// nonlinear units - must be loaded manually
+			database.addUnit("tempCelsius", NonlinearUnits.CELSIUS);
+			database.addUnit("tempFahrenheit", NonlinearUnits.FAHRENHEIT);
+
+			// load initial dimensions
+			database.addDimension("LENGTH", StandardDimensions.LENGTH);
+			database.addDimension("MASS", StandardDimensions.MASS);
+			database.addDimension("TIME", StandardDimensions.TIME);
+			database.addDimension("TEMPERATURE", StandardDimensions.TEMPERATURE);
+		}
+
+		/** The presenter's associated view. */
+		private final View view;
+
+		/** The units known by the program. */
+		private final UnitsDatabase database;
+
+		/** The names of all of the units */
+		private final List<String> unitNames;
+
+		/** The names of all of the prefixes */
+		private final List<String> prefixNames;
+
+		/** The names of all of the dimensions */
+		private final List<String> dimensionNames;
+
+		private final Comparator<String> prefixNameComparator;
+
+		private int significantFigures = 6;
+
+		/**
+		 * Creates the presenter.
+		 * 
+		 * @param view
+		 *            presenter's associated view
+		 * @since 2018-12-27
+		 * @since v0.1.0
+		 */
+		Presenter(final View view) {
+			this.view = view;
+
+			// load initial units
+			this.database = new UnitsDatabase();
+			Presenter.addDefaults(this.database);
+
+			this.database.loadUnitsFile(new File("unitsfile.txt"));
+			this.database.loadDimensionFile(new File("dimensionfile.txt"));
+
+			// a comparator that can be used to compare prefix names
+			// any name that does not exist is less than a name that does.
+			// otherwise, they are compared by value
+			this.prefixNameComparator = (o1, o2) -> {
+				if (!Presenter.this.database.containsPrefixName(o1))
+					return -1;
+				else if (!Presenter.this.database.containsPrefixName(o2))
+					return 1;
+
+				final UnitPrefix p1 = Presenter.this.database.getPrefix(o1);
+				final UnitPrefix p2 = Presenter.this.database.getPrefix(o2);
+
+				if (p1.getMultiplier() < p2.getMultiplier())
+					return -1;
+				else if (p1.getMultiplier() > p2.getMultiplier())
+					return 1;
+
+				return o1.compareTo(o2);
+			};
+
+			this.unitNames = new ArrayList<>(this.database.unitMapPrefixless().keySet());
+			this.unitNames.sort(null); // sorts it using Comparable
+
+			this.prefixNames = new ArrayList<>(this.database.prefixMap().keySet());
+			this.prefixNames.sort(this.prefixNameComparator); // sorts it using my comparator
+
+			this.dimensionNames = new DelegateListModel<>(new ArrayList<>(this.database.dimensionMap().keySet()));
+			this.dimensionNames.sort(null); // sorts it using Comparable
+
+			// a Predicate that returns true iff the argument is a full base unit
+			final Predicate<Unit> isFullBase = unit -> unit instanceof BaseUnit && ((BaseUnit) unit).isFullBase();
+
+			// print out unit counts
+			System.out.printf("Successfully loaded %d units with %d unit names (%d base units).%n",
+					new HashSet<>(this.database.unitMapPrefixless().values()).size(),
+					this.database.unitMapPrefixless().size(),
+					new HashSet<>(this.database.unitMapPrefixless().values()).stream().filter(isFullBase).count());
+		}
+
+		/**
+		 * Converts in the dimension-based converter
+		 * 
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public final void convertDimensionBased() {
+			final String fromSelection = this.view.getFromSelection();
+			if (fromSelection == null) {
+				this.view.showErrorDialog("Error", "No unit selected in From field");
+				return;
+			}
+			final String toSelection = this.view.getToSelection();
+			if (toSelection == null) {
+				this.view.showErrorDialog("Error", "No unit selected in To field");
+				return;
+			}
+
+			final Unit from = this.database.getUnit(fromSelection);
+			final Unit to = this.database.getUnit(toSelection);
+
+			final String input = this.view.getDimensionConverterInput();
+			if (input.equals("")) {
+				this.view.showErrorDialog("Error", "No value to convert entered.");
+				return;
+			}
+			final double beforeValue = Double.parseDouble(input);
+			final double value = to.convertFromBase(from.convertToBase(beforeValue));
+
+			final String output = this.getRoundedString(value);
+
+			this.view.setDimensionConverterOutputText(
+					String.format("%s %s = %s %s", input, fromSelection, output, toSelection));
+		}
+
+		/**
+		 * Runs whenever the convert button is pressed.
+		 * 
+		 * <p>
+		 * Reads and parses a unit expression from the from and to boxes, then converts {@code from} to {@code to}. Any
+		 * errors are shown in JOptionPanes.
+		 * </p>
+		 * 
+		 * @since 2019-01-26
+		 * @since v0.1.0
+		 */
+		public final void convertExpressions() {
+			final String fromUnitString = this.view.getFromText();
+			final String toUnitString = this.view.getToText();
+
+			if (fromUnitString.isEmpty()) {
+				this.view.showErrorDialog("Parse Error", "Please enter a unit expression in the From: box.");
+				return;
+			}
+			if (toUnitString.isEmpty()) {
+				this.view.showErrorDialog("Parse Error", "Please enter a unit expression in the To: box.");
+				return;
+			}
+
+			// try to parse from
+			final Unit from;
+			try {
+				from = this.database.getUnitFromExpression(fromUnitString);
+			} catch (final IllegalArgumentException e) {
+				this.view.showErrorDialog("Parse Error", "Could not recognize text in From entry: " + e.getMessage());
+				return;
+			}
+
+			final double value;
+			// try to parse to
+			final Unit to;
+			try {
+				if (this.database.containsUnitName(toUnitString)) {
+					// if it's a unit, convert to that
+					to = this.database.getUnit(toUnitString);
+				} else {
+					to = this.database.getUnitFromExpression(toUnitString);
+				}
+			} catch (final IllegalArgumentException e) {
+				this.view.showErrorDialog("Parse Error", "Could not recognize text in To entry: " + e.getMessage());
+				return;
+			}
+
+			// if I can't convert, leave
+			if (!from.canConvertTo(to)) {
+				this.view.showErrorDialog("Conversion Error",
+						String.format("Cannot convert between %s and %s", fromUnitString, toUnitString));
+				return;
+			}
+
+			value = to.convertFromBase(from.convertToBase(1));
+
+			// round value
+			final String output = this.getRoundedString(value);
+
+			this.view.setExpressionConverterOutputText(
+					String.format("%s = %s %s", fromUnitString, output, toUnitString));
+		}
+
+		/**
+		 * @return a list of all of the unit dimensions
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public final List<String> dimensionNameList() {
+			return this.dimensionNames;
+		}
+
+		/**
+		 * @return a comparator to compare prefix names
+		 * @since 2019-04-14
+		 * @since v0.2.0
+		 */
+		public final Comparator<String> getPrefixNameComparator() {
+			return this.prefixNameComparator;
+		}
+
+		/**
+		 * @param value
+		 *            value to round
+		 * @return string of that value rounded to {@code significantDigits} significant digits.
+		 * @since 2019-04-14
+		 * @since v0.2.0
+		 */
+		private final String getRoundedString(final double value) {
+			// round value
+			final BigDecimal bigValue = new BigDecimal(value).round(new MathContext(this.significantFigures));
+			String output = bigValue.toString();
+
+			// remove trailing zeroes
+			if (output.contains(".")) {
+				while (output.endsWith("0")) {
+					output = output.substring(0, output.length() - 1);
+				}
+				if (output.endsWith(".")) {
+					output = output.substring(0, output.length() - 1);
+				}
+			}
+
+			return output;
+		}
+
+		/**
+		 * @return a set of all prefix names in the database
+		 * @since 2019-04-14
+		 * @since v0.2.0
+		 */
+		public final Set<String> prefixNameSet() {
+			return this.database.prefixMap().keySet();
+		}
+
+		/**
+		 * Runs whenever a prefix is selected in the viewer.
+		 * <p>
+		 * Shows its information in the text box to the right.
+		 * </p>
+		 * 
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public final void prefixSelected() {
+			final String prefixName = this.view.getPrefixViewerSelection();
+			if (prefixName == null)
+				return;
+			else {
+				final UnitPrefix prefix = this.database.getPrefix(prefixName);
+
+				this.view.setPrefixTextBoxText(String.format("%s%nMultiplier: %s", prefixName, prefix.getMultiplier()));
+			}
+		}
+
+		/**
+		 * @param significantFigures
+		 *            new value of significantFigures
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public final void setSignificantFigures(final int significantFigures) {
+			this.significantFigures = significantFigures;
+		}
+
+		/**
+		 * Returns true if and only if the unit represented by {@code unitName} has the dimension represented by
+		 * {@code dimensionName}.
+		 * 
+		 * @param unitName
+		 *            name of unit to test
+		 * @param dimensionName
+		 *            name of dimension to test
+		 * @return whether unit has dimenision
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public final boolean unitMatchesDimension(final String unitName, final String dimensionName) {
+			final Unit unit = this.database.getUnit(unitName);
+			final UnitDimension dimension = this.database.getDimension(dimensionName);
+			return unit.getDimension().equals(dimension);
+		}
+
+		/**
+		 * Runs whenever a unit is selected in the viewer.
+		 * <p>
+		 * Shows its information in the text box to the right.
+		 * </p>
+		 * 
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public final void unitNameSelected() {
+			final String unitName = this.view.getUnitViewerSelection();
+			if (unitName == null)
+				return;
+			else {
+				final Unit unit = this.database.getUnit(unitName);
+
+				this.view.setUnitTextBoxText(unit.toString());
+			}
+		}
+
+		/**
+		 * @return a set of all of the unit names
+		 * @since 2019-04-14
+		 * @since v0.2.0
+		 */
+		public final Set<String> unitNameSet() {
+			return this.database.unitMapPrefixless().keySet();
+		}
+	}
+
+	private static class View {
+		/** The view's frame. */
+		private final JFrame frame;
+		/** The view's associated presenter. */
+		private final Presenter presenter;
+
+		// DIMENSION-BASED CONVERTER
+		/** The panel for inputting values in the dimension-based converter */
+		private final JTextField valueInput;
+		/** The panel for "From" in the dimension-based converter */
+		private final SearchBoxList fromSearch;
+		/** The panel for "To" in the dimension-based converter */
+		private final SearchBoxList toSearch;
+		/** The output area in the dimension-based converter */
+		private final JTextArea dimensionBasedOutput;
+
+		// EXPRESSION-BASED CONVERTER
+		/** The "From" entry in the conversion panel */
+		private final JTextField fromEntry;
+		/** The "To" entry in the conversion panel */
+		private final JTextField toEntry;
+		/** The output area in the conversion panel */
+		private final JTextArea output;
+
+		// UNIT AND PREFIX VIEWERS
+		/** The searchable list of unit names in the unit viewer */
+		private final SearchBoxList unitNameList;
+		/** The searchable list of prefix names in the prefix viewer */
+		private final SearchBoxList prefixNameList;
+		/** The text box for unit data in the unit viewer */
+		private final JTextArea unitTextBox;
+		/** The text box for prefix data in the prefix viewer */
+		private final JTextArea prefixTextBox;
+
+		/**
+		 * Creates the {@code View}.
+		 * 
+		 * @since 2019-01-14
+		 * @since v0.1.0
+		 */
+		public View() {
+			this.presenter = new Presenter(this);
+			this.frame = new JFrame("Unit Converter");
+			this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+			// create the components
+			this.unitNameList = new SearchBoxList(this.presenter.unitNameSet());
+			this.prefixNameList = new SearchBoxList(this.presenter.prefixNameSet(),
+					this.presenter.getPrefixNameComparator(), true);
+			this.unitTextBox = new JTextArea();
+			this.prefixTextBox = new JTextArea();
+			this.fromSearch = new SearchBoxList(this.presenter.unitNameSet());
+			this.toSearch = new SearchBoxList(this.presenter.unitNameSet());
+			this.valueInput = new JFormattedTextField(new DecimalFormat("###############0.################"));
+			this.dimensionBasedOutput = new JTextArea(2, 32);
+			this.fromEntry = new JTextField();
+			this.toEntry = new JTextField();
+			this.output = new JTextArea(2, 32);
+
+			// create more components
+			this.initComponents();
+
+			this.frame.pack();
+		}
+
+		/**
+		 * @return value in dimension-based converter
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public String getDimensionConverterInput() {
+			return this.valueInput.getText();
+		}
+
+		/**
+		 * @return selection in "From" selector in dimension-based converter
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public String getFromSelection() {
+			return this.fromSearch.getSelectedValue();
+		}
+
+		/**
+		 * @return text in "From" box in converter panel
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public String getFromText() {
+			return this.fromEntry.getText();
+		}
+
+		/**
+		 * @return index of selected prefix in prefix viewer
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public String getPrefixViewerSelection() {
+			return this.prefixNameList.getSelectedValue();
+		}
+
+		/**
+		 * @return selection in "To" selector in dimension-based converter
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public String getToSelection() {
+			return this.toSearch.getSelectedValue();
+		}
+
+		/**
+		 * @return text in "To" box in converter panel
+		 * @since 2019-01-26
+		 * @since v0.1.0
+		 */
+		public String getToText() {
+			return this.toEntry.getText();
+		}
+
+		/**
+		 * @return index of selected unit in unit viewer
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public String getUnitViewerSelection() {
+			return this.unitNameList.getSelectedValue();
+		}
+
+		/**
+		 * Starts up the application.
+		 * 
+		 * @since 2018-12-27
+		 * @since v0.1.0
+		 */
+		public final void init() {
+			this.frame.setVisible(true);
+		}
+
+		/**
+		 * Initializes the view's components.
+		 * 
+		 * @since 2018-12-27
+		 * @since v0.1.0
+		 */
+		private final void initComponents() {
+			final JPanel masterPanel = new JPanel();
+			this.frame.add(masterPanel);
+
+			masterPanel.setLayout(new BorderLayout());
+
+			{ // pane with all of the tabs
+				final JTabbedPane masterPane = new JTabbedPane();
+				masterPanel.add(masterPane, BorderLayout.CENTER);
+
+				{ // a panel for unit conversion using a selector
+					final JPanel convertUnitPanel = new JPanel();
+					masterPane.addTab("Convert Units", convertUnitPanel);
+
+					convertUnitPanel.setLayout(new BorderLayout());
+
+					{ // panel for input part
+						final JPanel inputPanel = new JPanel();
+						convertUnitPanel.add(inputPanel, BorderLayout.CENTER);
+
+						inputPanel.setLayout(new GridLayout(1, 3));
+
+						final JComboBox<String> dimensionSelector = new JComboBox<>(
+								this.presenter.dimensionNameList().toArray(new String[0]));
+						dimensionSelector.setSelectedItem("LENGTH");
+
+						// handle dimension filter
+						final MutablePredicate<String> dimensionFilter = new MutablePredicate<>(s -> true);
+
+						// panel for From things
+						inputPanel.add(this.fromSearch);
+
+						this.fromSearch.addSearchFilter(dimensionFilter);
+
+						{ // for dimension selector and arrow that represents conversion
+							final JPanel inBetweenPanel = new JPanel();
+							inputPanel.add(inBetweenPanel);
+
+							inBetweenPanel.setLayout(new BorderLayout());
+
+							{ // dimension selector
+								inBetweenPanel.add(dimensionSelector, BorderLayout.PAGE_START);
+							}
+
+							{ // the arrow in the middle
+								final JLabel arrowLabel = new JLabel("->");
+								inBetweenPanel.add(arrowLabel, BorderLayout.CENTER);
+							}
+						}
+
+						// panel for To things
+
+						inputPanel.add(this.toSearch);
+
+						this.toSearch.addSearchFilter(dimensionFilter);
+
+						// code for dimension filter
+						dimensionSelector.addItemListener(e -> {
+							dimensionFilter.setPredicate(string -> View.this.presenter.unitMatchesDimension(string,
+									(String) dimensionSelector.getSelectedItem()));
+							this.fromSearch.reapplyFilter();
+							this.toSearch.reapplyFilter();
+						});
+
+						// apply the item listener once because I have a default selection
+						dimensionFilter.setPredicate(string -> View.this.presenter.unitMatchesDimension(string,
+								(String) dimensionSelector.getSelectedItem()));
+						this.fromSearch.reapplyFilter();
+						this.toSearch.reapplyFilter();
+					}
+
+					{ // panel for submit and output, and also value entry
+						final JPanel outputPanel = new JPanel();
+						convertUnitPanel.add(outputPanel, BorderLayout.PAGE_END);
+
+						outputPanel.setLayout(new GridLayout(3, 1));
+
+						{ // unit input
+							final JPanel valueInputPanel = new JPanel();
+							outputPanel.add(valueInputPanel);
+
+							valueInputPanel.setLayout(new BorderLayout());
+
+							{ // prompt
+								final JLabel valuePrompt = new JLabel("Value to convert: ");
+								valueInputPanel.add(valuePrompt, BorderLayout.LINE_START);
+							}
+
+							{ // value to convert
+								valueInputPanel.add(this.valueInput, BorderLayout.CENTER);
+							}
+						}
+
+						{ // button to convert
+							final JButton convertButton = new JButton("Convert");
+							outputPanel.add(convertButton);
+
+							convertButton.addActionListener(e -> this.presenter.convertDimensionBased());
+						}
+
+						{ // output of conversion
+							outputPanel.add(this.dimensionBasedOutput);
+							this.dimensionBasedOutput.setEditable(false);
+						}
+					}
+				}
+
+				{ // panel for unit conversion using expressions
+					final JPanel convertExpressionPanel = new JPanel();
+					masterPane.addTab("Convert Unit Expressions", convertExpressionPanel);
+
+					convertExpressionPanel.setLayout(new GridLayout(5, 1));
+
+					{ // panel for units to convert from
+						final JPanel fromPanel = new JPanel();
+						convertExpressionPanel.add(fromPanel);
+
+						fromPanel.setBorder(BorderFactory.createTitledBorder("From"));
+						fromPanel.setLayout(new GridLayout(1, 1));
+
+						{ // entry for units
+							fromPanel.add(this.fromEntry);
+						}
+					}
+
+					{ // panel for units to convert to
+						final JPanel toPanel = new JPanel();
+						convertExpressionPanel.add(toPanel);
+
+						toPanel.setBorder(BorderFactory.createTitledBorder("To"));
+						toPanel.setLayout(new GridLayout(1, 1));
+
+						{ // entry for units
+							toPanel.add(this.toEntry);
+						}
+					}
+
+					{ // button to convert
+						final JButton convertButton = new JButton("Convert!");
+						convertExpressionPanel.add(convertButton);
+
+						convertButton.addActionListener(e -> this.presenter.convertExpressions());
+					}
+
+					{ // output of conversion
+						final JPanel outputPanel = new JPanel();
+						convertExpressionPanel.add(outputPanel);
+
+						outputPanel.setBorder(BorderFactory.createTitledBorder("Output"));
+						outputPanel.setLayout(new GridLayout(1, 1));
+
+						{ // output
+							outputPanel.add(this.output);
+							this.output.setEditable(false);
+						}
+					}
+
+					{ // panel for specifying precision
+						final JPanel sigDigPanel = new JPanel();
+						convertExpressionPanel.add(sigDigPanel);
+
+						sigDigPanel.setBorder(BorderFactory.createTitledBorder("Significant Digits"));
+
+						{ // slider
+							final JSlider sigDigSlider = new JSlider(0, 12);
+							sigDigPanel.add(sigDigSlider);
+
+							sigDigSlider.setMajorTickSpacing(4);
+							sigDigSlider.setMinorTickSpacing(1);
+							sigDigSlider.setSnapToTicks(true);
+							sigDigSlider.setPaintTicks(true);
+							sigDigSlider.setPaintLabels(true);
+
+							sigDigSlider.addChangeListener(
+									e -> this.presenter.setSignificantFigures(sigDigSlider.getValue()));
+						}
+					}
+				}
+
+				{ // panel to look up units
+					final JPanel unitLookupPanel = new JPanel();
+					masterPane.addTab("Unit Viewer", unitLookupPanel);
+
+					unitLookupPanel.setLayout(new GridLayout());
+
+					{ // search panel
+						unitLookupPanel.add(this.unitNameList);
+
+						this.unitNameList.getSearchList()
+								.addListSelectionListener(e -> this.presenter.unitNameSelected());
+					}
+
+					{ // the text box for unit's toString
+						unitLookupPanel.add(this.unitTextBox);
+						this.unitTextBox.setEditable(false);
+						this.unitTextBox.setLineWrap(true);
+					}
+				}
+
+				{ // panel to look up prefixes
+					final JPanel prefixLookupPanel = new JPanel();
+					masterPane.addTab("Prefix Viewer", prefixLookupPanel);
+
+					prefixLookupPanel.setLayout(new GridLayout(1, 2));
+
+					{ // panel for listing and seaching
+						prefixLookupPanel.add(this.prefixNameList);
+
+						this.prefixNameList.getSearchList()
+								.addListSelectionListener(e -> this.presenter.prefixSelected());
+					}
+
+					{ // the text box for prefix's toString
+						prefixLookupPanel.add(this.prefixTextBox);
+						this.prefixTextBox.setEditable(false);
+						this.prefixTextBox.setLineWrap(true);
+					}
+				}
+			}
+		}
+
+		/**
+		 * Sets the text in the output of the dimension-based converter.
+		 * 
+		 * @param text
+		 *            text to set
+		 * @since 2019-04-13
+		 * @since v0.2.0
+		 */
+		public void setDimensionConverterOutputText(final String text) {
+			this.dimensionBasedOutput.setText(text);
+		}
+
+		/**
+		 * Sets the text in the output of the conversion panel.
+		 * 
+		 * @param text
+		 *            text to set
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public void setExpressionConverterOutputText(final String text) {
+			this.output.setText(text);
+		}
+
+		/**
+		 * Sets the text of the prefix text box in the prefix viewer.
+		 * 
+		 * @param text
+		 *            text to set
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public void setPrefixTextBoxText(final String text) {
+			this.prefixTextBox.setText(text);
+		}
+
+		/**
+		 * Sets the text of the unit text box in the unit viewer.
+		 * 
+		 * @param text
+		 *            text to set
+		 * @since 2019-01-15
+		 * @since v0.1.0
+		 */
+		public void setUnitTextBoxText(final String text) {
+			this.unitTextBox.setText(text);
+		}
+
+		/**
+		 * Shows an error dialog.
+		 * 
+		 * @param title
+		 *            title of dialog
+		 * @param message
+		 *            message in dialog
+		 * @since 2019-01-14
+		 * @since v0.1.0
+		 */
+		public void showErrorDialog(final String title, final String message) {
+			JOptionPane.showMessageDialog(this.frame, message, title, JOptionPane.ERROR_MESSAGE);
+		}
+	}
+
+	public static void main(final String[] args) {
+		new View().init();
+	}
+}
diff --git a/src/org/unitConverter/converterGUI/package-info.java b/src/org/unitConverter/converterGUI/package-info.java
new file mode 100644
index 0000000..1555291
--- /dev/null
+++ b/src/org/unitConverter/converterGUI/package-info.java
@@ -0,0 +1,24 @@
+/**
+ * Copyright (C) 2019 Adrien Hopkins
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+/**
+ * All classes that work to convert units.
+ * 
+ * @author Adrien Hopkins
+ * @since 2019-01-25
+ * @since v0.2.0
+ */
+package org.unitConverter.converterGUI;
\ No newline at end of file