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Diffstat (limited to 'src/org/unitConverter/UnitsDatabase.java')
| -rw-r--r-- | src/org/unitConverter/UnitsDatabase.java | 1658 |
1 files changed, 0 insertions, 1658 deletions
diff --git a/src/org/unitConverter/UnitsDatabase.java b/src/org/unitConverter/UnitsDatabase.java deleted file mode 100644 index 520195c..0000000 --- a/src/org/unitConverter/UnitsDatabase.java +++ /dev/null @@ -1,1658 +0,0 @@ -/** - * 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; - -import java.io.BufferedReader; -import java.io.File; -import java.io.FileNotFoundException; -import java.io.FileReader; -import java.io.IOException; -import java.util.AbstractSet; -import java.util.ArrayList; -import java.util.Arrays; -import java.util.Collection; -import java.util.Collections; -import java.util.HashMap; -import java.util.Iterator; -import java.util.List; -import java.util.Map; -import java.util.NoSuchElementException; -import java.util.Objects; -import java.util.Set; -import java.util.function.BiFunction; -import java.util.function.Function; -import java.util.function.Predicate; -import java.util.regex.Matcher; -import java.util.regex.Pattern; - -import org.unitConverter.dimension.UnitDimension; -import org.unitConverter.math.DecimalComparison; -import org.unitConverter.math.ExpressionParser; -import org.unitConverter.unit.DefaultUnitPrefix; -import org.unitConverter.unit.LinearUnit; -import org.unitConverter.unit.SI; -import org.unitConverter.unit.Unit; -import org.unitConverter.unit.UnitPrefix; - -/** - * A database of units, prefixes and dimensions, and their names. - * - * @author Adrien Hopkins - * @since 2019-01-07 - * @since v0.1.0 - */ -public final class UnitsDatabase { - /** - * A map for units that allows the use of prefixes. - * <p> - * As this map implementation is intended to be used as a sort of "augmented view" of a unit and prefix map, it is - * unmodifiable but instead reflects the changes to the maps passed into it. Do not edit this map, instead edit the - * maps that were passed in during construction. - * </p> - * <p> - * The rules for applying prefixes onto units are the following: - * <ul> - * <li>Prefixes can only be applied to linear units.</li> - * <li>Before attempting to search for prefixes in a unit name, this map will first search for a unit name. So, if - * there are two units, "B" and "AB", and a prefix "A", this map will favour the unit "AB" over the unit "B" with - * the prefix "A", even though they have the same string.</li> - * <li>Longer prefixes are preferred to shorter prefixes. So, if you have units "BC" and "C", and prefixes "AB" and - * "A", inputting "ABC" will return the unit "C" with the prefix "AB", not "BC" with the prefix "A".</li> - * </ul> - * </p> - * <p> - * This map is infinite in size if there is at least one unit and at least one prefix. If it is infinite, some - * operations that only work with finite collections, like converting name/entry sets to arrays, will throw an - * {@code IllegalStateException}. - * </p> - * <p> - * Because of ambiguities between prefixes (i.e. kilokilo = mega), {@link #containsValue} and {@link #values()} - * currently ignore prefixes. - * </p> - * - * @author Adrien Hopkins - * @since 2019-04-13 - * @since v0.2.0 - */ - private static final class PrefixedUnitMap implements Map<String, Unit> { - /** - * The class used for entry sets. - * - * <p> - * If the map that created this set is infinite in size (has at least one unit and at least one prefix), this - * set is infinite as well. If this set is infinite in size, {@link #toArray} will fail with a - * {@code IllegalStateException} instead of creating an infinite-sized array. - * </p> - * - * @author Adrien Hopkins - * @since 2019-04-13 - * @since v0.2.0 - */ - private static final class PrefixedUnitEntrySet extends AbstractSet<Map.Entry<String, Unit>> { - /** - * The entry for this set. - * - * @author Adrien Hopkins - * @since 2019-04-14 - * @since v0.2.0 - */ - private static final class PrefixedUnitEntry implements Entry<String, Unit> { - private final String key; - private final Unit value; - - /** - * Creates the {@code PrefixedUnitEntry}. - * - * @param key - * key - * @param value - * value - * @since 2019-04-14 - * @since v0.2.0 - */ - public PrefixedUnitEntry(final String key, final Unit value) { - this.key = key; - this.value = value; - } - - /** - * @since 2019-05-03 - */ - @Override - public boolean equals(final Object o) { - if (!(o instanceof Map.Entry)) - return false; - final Map.Entry<?, ?> other = (Map.Entry<?, ?>) o; - return Objects.equals(this.getKey(), other.getKey()) - && Objects.equals(this.getValue(), other.getValue()); - } - - @Override - public String getKey() { - return this.key; - } - - @Override - public Unit getValue() { - return this.value; - } - - /** - * @since 2019-05-03 - */ - @Override - public int hashCode() { - return (this.getKey() == null ? 0 : this.getKey().hashCode()) - ^ (this.getValue() == null ? 0 : this.getValue().hashCode()); - } - - @Override - public Unit setValue(final Unit value) { - throw new UnsupportedOperationException("Cannot set value in an immutable entry"); - } - - /** - * Returns a string representation of the entry. The format of the string is the string representation - * of the key, then the equals ({@code =}) character, then the string representation of the value. - * - * @since 2019-05-03 - */ - @Override - public String toString() { - return this.getKey() + "=" + this.getValue(); - } - } - - /** - * An iterator that iterates over the units of a {@code PrefixedUnitNameSet}. - * - * @author Adrien Hopkins - * @since 2019-04-14 - * @since v0.2.0 - */ - private static final class PrefixedUnitEntryIterator implements Iterator<Entry<String, Unit>> { - // position in the unit list - private int unitNamePosition = 0; - // the indices of the prefixes attached to the current unit - private final List<Integer> prefixCoordinates = new ArrayList<>(); - - // values from the unit entry set - private final Map<String, Unit> map; - private transient final List<String> unitNames; - private transient final List<String> prefixNames; - - /** - * Creates the {@code UnitsDatabase.PrefixedUnitMap.PrefixedUnitNameSet.PrefixedUnitNameIterator}. - * - * @since 2019-04-14 - * @since v0.2.0 - */ - public PrefixedUnitEntryIterator(final PrefixedUnitMap map) { - this.map = map; - this.unitNames = new ArrayList<>(map.units.keySet()); - this.prefixNames = new ArrayList<>(map.prefixes.keySet()); - } - - /** - * @return current unit name - * @since 2019-04-14 - * @since v0.2.0 - */ - private String getCurrentUnitName() { - final StringBuilder unitName = new StringBuilder(); - for (final int i : this.prefixCoordinates) { - unitName.append(this.prefixNames.get(i)); - } - unitName.append(this.unitNames.get(this.unitNamePosition)); - - return unitName.toString(); - } - - @Override - public boolean hasNext() { - if (this.unitNames.isEmpty()) - return false; - else { - if (this.prefixNames.isEmpty()) - return this.unitNamePosition >= this.unitNames.size() - 1; - else - return true; - } - } - - /** - * Changes this iterator's position to the next available one. - * - * @since 2019-04-14 - * @since v0.2.0 - */ - private void incrementPosition() { - this.unitNamePosition++; - - if (this.unitNamePosition >= this.unitNames.size()) { - // we have used all of our units, go to a different prefix - this.unitNamePosition = 0; - - // if the prefix coordinates are empty, then set it to [0] - if (this.prefixCoordinates.isEmpty()) { - this.prefixCoordinates.add(0, 0); - } else { - // get the prefix coordinate to increment, then increment - int i = this.prefixCoordinates.size() - 1; - this.prefixCoordinates.set(i, this.prefixCoordinates.get(i) + 1); - - // fix any carrying errors - while (i >= 0 && this.prefixCoordinates.get(i) >= this.prefixNames.size()) { - // carry over - this.prefixCoordinates.set(i--, 0); // null and decrement at the same time - - if (i < 0) { // we need to add a new coordinate - this.prefixCoordinates.add(0, 0); - } else { // increment an existing one - this.prefixCoordinates.set(i, this.prefixCoordinates.get(i) + 1); - } - } - } - } - } - - @Override - public Entry<String, Unit> next() { - // get next element - final Entry<String, Unit> nextEntry = this.peek(); - - // iterate to next position - this.incrementPosition(); - - return nextEntry; - } - - /** - * @return the next element in the iterator, without iterating over it - * @since 2019-05-03 - */ - private Entry<String, Unit> peek() { - if (!this.hasNext()) - throw new NoSuchElementException("No units left!"); - - // if I have prefixes, ensure I'm not using a nonlinear unit - // since all of the unprefixed stuff is done, just remove nonlinear units - if (!this.prefixCoordinates.isEmpty()) { - while (this.unitNamePosition < this.unitNames.size() - && !(this.map.get(this.unitNames.get(this.unitNamePosition)) instanceof LinearUnit)) { - this.unitNames.remove(this.unitNamePosition); - } - } - - final String nextName = this.getCurrentUnitName(); - - return new PrefixedUnitEntry(nextName, this.map.get(nextName)); - } - - /** - * Returns a string representation of the object. The exact details of the representation are - * unspecified and subject to change. - * - * @since 2019-05-03 - */ - @Override - public String toString() { - return String.format("Iterator iterating over name-unit entries; next value is \"%s\"", - this.peek()); - } - } - - // the map that created this set - private final PrefixedUnitMap map; - - /** - * Creates the {@code PrefixedUnitNameSet}. - * - * @param map - * map that created this set - * @since 2019-04-13 - * @since v0.2.0 - */ - public PrefixedUnitEntrySet(final PrefixedUnitMap map) { - this.map = map; - } - - @Override - public boolean add(final Map.Entry<String, Unit> e) { - throw new UnsupportedOperationException("Cannot add to an immutable set"); - } - - @Override - public boolean addAll(final Collection<? extends Map.Entry<String, Unit>> c) { - throw new UnsupportedOperationException("Cannot add to an immutable set"); - } - - @Override - public void clear() { - throw new UnsupportedOperationException("Cannot clear an immutable set"); - } - - @Override - public boolean contains(final Object o) { - // get the entry - final Entry<String, Unit> entry; - - try { - // This is OK because I'm in a try-catch block, catching the exact exception that would be thrown. - @SuppressWarnings("unchecked") - final Entry<String, Unit> tempEntry = (Entry<String, Unit>) o; - entry = tempEntry; - } catch (final ClassCastException e) { - throw new IllegalArgumentException("Attempted to test for an entry using a non-entry."); - } - - return this.map.containsKey(entry.getKey()) && this.map.get(entry.getKey()).equals(entry.getValue()); - } - - @Override - public boolean containsAll(final Collection<?> c) { - for (final Object o : c) - if (!this.contains(o)) - return false; - return true; - } - - @Override - public boolean isEmpty() { - return this.map.isEmpty(); - } - - @Override - public Iterator<Entry<String, Unit>> iterator() { - return new PrefixedUnitEntryIterator(this.map); - } - - @Override - public boolean remove(final Object o) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public boolean removeAll(final Collection<?> c) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public boolean removeIf(final Predicate<? super Entry<String, Unit>> filter) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public boolean retainAll(final Collection<?> c) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public int size() { - if (this.map.units.isEmpty()) - return 0; - else { - if (this.map.prefixes.isEmpty()) - return this.map.units.size(); - else - // infinite set - return Integer.MAX_VALUE; - } - } - - /** - * @throws IllegalStateException - * if the set is infinite in size - */ - @Override - public Object[] toArray() { - if (this.map.units.isEmpty() || this.map.prefixes.isEmpty()) - return super.toArray(); - else - // infinite set - throw new IllegalStateException("Cannot make an infinite set into an array."); - } - - /** - * @throws IllegalStateException - * if the set is infinite in size - */ - @Override - public <T> T[] toArray(final T[] a) { - if (this.map.units.isEmpty() || this.map.prefixes.isEmpty()) - return super.toArray(a); - else - // infinite set - throw new IllegalStateException("Cannot make an infinite set into an array."); - } - - @Override - public String toString() { - if (this.map.units.isEmpty() || this.map.prefixes.isEmpty()) - return super.toString(); - else - return String.format("Infinite set of name-unit entries created from units %s and prefixes %s", - this.map.units, this.map.prefixes); - } - } - - /** - * The class used for unit name sets. - * - * <p> - * If the map that created this set is infinite in size (has at least one unit and at least one prefix), this - * set is infinite as well. If this set is infinite in size, {@link #toArray} will fail with a - * {@code IllegalStateException} instead of creating an infinite-sized array. - * </p> - * - * @author Adrien Hopkins - * @since 2019-04-13 - * @since v0.2.0 - */ - private static final class PrefixedUnitNameSet extends AbstractSet<String> { - /** - * An iterator that iterates over the units of a {@code PrefixedUnitNameSet}. - * - * @author Adrien Hopkins - * @since 2019-04-14 - * @since v0.2.0 - */ - private static final class PrefixedUnitNameIterator implements Iterator<String> { - // position in the unit list - private int unitNamePosition = 0; - // the indices of the prefixes attached to the current unit - private final List<Integer> prefixCoordinates = new ArrayList<>(); - - // values from the unit name set - private final Map<String, Unit> map; - private transient final List<String> unitNames; - private transient final List<String> prefixNames; - - /** - * Creates the {@code UnitsDatabase.PrefixedUnitMap.PrefixedUnitNameSet.PrefixedUnitNameIterator}. - * - * @since 2019-04-14 - * @since v0.2.0 - */ - public PrefixedUnitNameIterator(final PrefixedUnitMap map) { - this.map = map; - this.unitNames = new ArrayList<>(map.units.keySet()); - this.prefixNames = new ArrayList<>(map.prefixes.keySet()); - } - - /** - * @return current unit name - * @since 2019-04-14 - * @since v0.2.0 - */ - private String getCurrentUnitName() { - final StringBuilder unitName = new StringBuilder(); - for (final int i : this.prefixCoordinates) { - unitName.append(this.prefixNames.get(i)); - } - unitName.append(this.unitNames.get(this.unitNamePosition)); - - return unitName.toString(); - } - - @Override - public boolean hasNext() { - if (this.unitNames.isEmpty()) - return false; - else { - if (this.prefixNames.isEmpty()) - return this.unitNamePosition >= this.unitNames.size() - 1; - else - return true; - } - } - - /** - * Changes this iterator's position to the next available one. - * - * @since 2019-04-14 - * @since v0.2.0 - */ - private void incrementPosition() { - this.unitNamePosition++; - - if (this.unitNamePosition >= this.unitNames.size()) { - // we have used all of our units, go to a different prefix - this.unitNamePosition = 0; - - // if the prefix coordinates are empty, then set it to [0] - if (this.prefixCoordinates.isEmpty()) { - this.prefixCoordinates.add(0, 0); - } else { - // get the prefix coordinate to increment, then increment - int i = this.prefixCoordinates.size() - 1; - this.prefixCoordinates.set(i, this.prefixCoordinates.get(i) + 1); - - // fix any carrying errors - while (i >= 0 && this.prefixCoordinates.get(i) >= this.prefixNames.size()) { - // carry over - this.prefixCoordinates.set(i--, 0); // null and decrement at the same time - - if (i < 0) { // we need to add a new coordinate - this.prefixCoordinates.add(0, 0); - } else { // increment an existing one - this.prefixCoordinates.set(i, this.prefixCoordinates.get(i) + 1); - } - } - } - } - } - - @Override - public String next() { - final String nextName = this.peek(); - - this.incrementPosition(); - - return nextName; - } - - /** - * @return the next element in the iterator, without iterating over it - * @since 2019-05-03 - */ - private String peek() { - if (!this.hasNext()) - throw new NoSuchElementException("No units left!"); - // if I have prefixes, ensure I'm not using a nonlinear unit - // since all of the unprefixed stuff is done, just remove nonlinear units - if (!this.prefixCoordinates.isEmpty()) { - while (this.unitNamePosition < this.unitNames.size() - && !(this.map.get(this.unitNames.get(this.unitNamePosition)) instanceof LinearUnit)) { - this.unitNames.remove(this.unitNamePosition); - } - } - - return this.getCurrentUnitName(); - } - - /** - * Returns a string representation of the object. The exact details of the representation are - * unspecified and subject to change. - * - * @since 2019-05-03 - */ - @Override - public String toString() { - return String.format("Iterator iterating over unit names; next value is \"%s\"", this.peek()); - } - } - - // the map that created this set - private final PrefixedUnitMap map; - - /** - * Creates the {@code PrefixedUnitNameSet}. - * - * @param map - * map that created this set - * @since 2019-04-13 - * @since v0.2.0 - */ - public PrefixedUnitNameSet(final PrefixedUnitMap map) { - this.map = map; - } - - @Override - public boolean add(final String e) { - throw new UnsupportedOperationException("Cannot add to an immutable set"); - } - - @Override - public boolean addAll(final Collection<? extends String> c) { - throw new UnsupportedOperationException("Cannot add to an immutable set"); - } - - @Override - public void clear() { - throw new UnsupportedOperationException("Cannot clear an immutable set"); - } - - @Override - public boolean contains(final Object o) { - return this.map.containsKey(o); - } - - @Override - public boolean containsAll(final Collection<?> c) { - for (final Object o : c) - if (!this.contains(o)) - return false; - return true; - } - - @Override - public boolean isEmpty() { - return this.map.isEmpty(); - } - - @Override - public Iterator<String> iterator() { - return new PrefixedUnitNameIterator(this.map); - } - - @Override - public boolean remove(final Object o) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public boolean removeAll(final Collection<?> c) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public boolean removeIf(final Predicate<? super String> filter) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public boolean retainAll(final Collection<?> c) { - throw new UnsupportedOperationException("Cannot remove from an immutable set"); - } - - @Override - public int size() { - if (this.map.units.isEmpty()) - return 0; - else { - if (this.map.prefixes.isEmpty()) - return this.map.units.size(); - else - // infinite set - return Integer.MAX_VALUE; - } - } - - /** - * @throws IllegalStateException - * if the set is infinite in size - */ - @Override - public Object[] toArray() { - if (this.map.units.isEmpty() || this.map.prefixes.isEmpty()) - return super.toArray(); - else - // infinite set - throw new IllegalStateException("Cannot make an infinite set into an array."); - - } - - /** - * @throws IllegalStateException - * if the set is infinite in size - */ - @Override - public <T> T[] toArray(final T[] a) { - if (this.map.units.isEmpty() || this.map.prefixes.isEmpty()) - return super.toArray(a); - else - // infinite set - throw new IllegalStateException("Cannot make an infinite set into an array."); - } - - @Override - public String toString() { - if (this.map.units.isEmpty() || this.map.prefixes.isEmpty()) - return super.toString(); - else - return String.format("Infinite set of name-unit entries created from units %s and prefixes %s", - this.map.units, this.map.prefixes); - } - } - - /** - * The units stored in this collection, without prefixes. - * - * @since 2019-04-13 - * @since v0.2.0 - */ - private final Map<String, Unit> units; - - /** - * The available prefixes for use. - * - * @since 2019-04-13 - * @since v0.2.0 - */ - private final Map<String, UnitPrefix> prefixes; - - // caches - private transient Collection<Unit> values = null; - private transient Set<String> keySet = null; - private transient Set<Entry<String, Unit>> entrySet = null; - - /** - * Creates the {@code PrefixedUnitMap}. - * - * @param units - * map mapping unit names to units - * @param prefixes - * map mapping prefix names to prefixes - * @since 2019-04-13 - * @since v0.2.0 - */ - public PrefixedUnitMap(final Map<String, Unit> units, final Map<String, UnitPrefix> prefixes) { - // I am making unmodifiable maps to ensure I don't accidentally make changes. - this.units = Collections.unmodifiableMap(units); - this.prefixes = Collections.unmodifiableMap(prefixes); - } - - @Override - public void clear() { - throw new UnsupportedOperationException("Cannot clear an immutable map"); - } - - @Override - public Unit compute(final String key, - final BiFunction<? super String, ? super Unit, ? extends Unit> remappingFunction) { - throw new UnsupportedOperationException("Cannot edit an immutable map"); - } - - @Override - public Unit computeIfAbsent(final String key, final Function<? super String, ? extends Unit> mappingFunction) { - throw new UnsupportedOperationException("Cannot edit an immutable map"); - } - - @Override - public Unit computeIfPresent(final String key, - final BiFunction<? super String, ? super Unit, ? extends Unit> remappingFunction) { - throw new UnsupportedOperationException("Cannot edit an immutable map"); - } - - @Override - public boolean containsKey(final Object key) { - // First, test if there is a unit with the key - if (this.units.containsKey(key)) - return true; - - // Next, try to cast it to String - if (!(key instanceof String)) - throw new IllegalArgumentException("Attempted to test for a unit using a non-string name."); - final String unitName = (String) key; - - // Then, look for the longest prefix that is attached to a valid unit - String longestPrefix = null; - int longestLength = 0; - - for (final String prefixName : this.prefixes.keySet()) { - // a prefix name is valid if: - // - it is prefixed (i.e. the unit name starts with it) - // - it is longer than the existing largest prefix (since I am looking for the longest valid prefix) - // - the part after the prefix is a valid unit name - // - the unit described that name is a linear unit (since only linear units can have prefixes) - if (unitName.startsWith(prefixName) && prefixName.length() > longestLength) { - final String rest = unitName.substring(prefixName.length()); - if (this.containsKey(rest) && this.get(rest) instanceof LinearUnit) { - longestPrefix = prefixName; - longestLength = prefixName.length(); - } - } - } - - return longestPrefix != null; - } - - /** - * {@inheritDoc} - * - * <p> - * Because of ambiguities between prefixes (i.e. kilokilo = mega), this method only tests for prefixless units. - * </p> - */ - @Override - public boolean containsValue(final Object value) { - return this.units.containsValue(value); - } - - @Override - public Set<Entry<String, Unit>> entrySet() { - if (this.entrySet == null) { - this.entrySet = new PrefixedUnitEntrySet(this); - } - return this.entrySet; - } - - @Override - public Unit get(final Object key) { - // First, test if there is a unit with the key - if (this.units.containsKey(key)) - return this.units.get(key); - - // Next, try to cast it to String - if (!(key instanceof String)) - throw new IllegalArgumentException("Attempted to obtain a unit using a non-string name."); - final String unitName = (String) key; - - // Then, look for the longest prefix that is attached to a valid unit - String longestPrefix = null; - int longestLength = 0; - - for (final String prefixName : this.prefixes.keySet()) { - // a prefix name is valid if: - // - it is prefixed (i.e. the unit name starts with it) - // - it is longer than the existing largest prefix (since I am looking for the longest valid prefix) - // - the part after the prefix is a valid unit name - // - the unit described that name is a linear unit (since only linear units can have prefixes) - if (unitName.startsWith(prefixName) && prefixName.length() > longestLength) { - final String rest = unitName.substring(prefixName.length()); - if (this.containsKey(rest) && this.get(rest) instanceof LinearUnit) { - longestPrefix = prefixName; - longestLength = prefixName.length(); - } - } - } - - // if none found, returns null - if (longestPrefix == null) - return null; - else { - // get necessary data - final String rest = unitName.substring(longestLength); - // this cast will not fail because I verified that it would work before selecting this prefix - final LinearUnit unit = (LinearUnit) this.get(rest); - final UnitPrefix prefix = this.prefixes.get(longestPrefix); - - return unit.withPrefix(prefix); - } - } - - @Override - public boolean isEmpty() { - return this.units.isEmpty(); - } - - @Override - public Set<String> keySet() { - if (this.keySet == null) { - this.keySet = new PrefixedUnitNameSet(this); - } - return this.keySet; - } - - @Override - public Unit merge(final String key, final Unit value, - final BiFunction<? super Unit, ? super Unit, ? extends Unit> remappingFunction) { - throw new UnsupportedOperationException("Cannot merge into an immutable map"); - } - - @Override - public Unit put(final String key, final Unit value) { - throw new UnsupportedOperationException("Cannot add entries to an immutable map"); - } - - @Override - public void putAll(final Map<? extends String, ? extends Unit> m) { - throw new UnsupportedOperationException("Cannot add entries to an immutable map"); - } - - @Override - public Unit putIfAbsent(final String key, final Unit value) { - throw new UnsupportedOperationException("Cannot add entries to an immutable map"); - } - - @Override - public Unit remove(final Object key) { - throw new UnsupportedOperationException("Cannot remove entries from an immutable map"); - } - - @Override - public boolean remove(final Object key, final Object value) { - throw new UnsupportedOperationException("Cannot remove entries from an immutable map"); - } - - @Override - public Unit replace(final String key, final Unit value) { - throw new UnsupportedOperationException("Cannot replace entries in an immutable map"); - } - - @Override - public boolean replace(final String key, final Unit oldValue, final Unit newValue) { - throw new UnsupportedOperationException("Cannot replace entries in an immutable map"); - } - - @Override - public void replaceAll(final BiFunction<? super String, ? super Unit, ? extends Unit> function) { - throw new UnsupportedOperationException("Cannot replace entries in an immutable map"); - } - - @Override - public int size() { - if (this.units.isEmpty()) - return 0; - else { - if (this.prefixes.isEmpty()) - return this.units.size(); - else - // infinite set - return Integer.MAX_VALUE; - } - } - - @Override - public String toString() { - if (this.units.isEmpty() || this.prefixes.isEmpty()) - return super.toString(); - else - return String.format("Infinite map of name-unit entries created from units %s and prefixes %s", - this.units, this.prefixes); - } - - /** - * {@inheritDoc} - * - * <p> - * Because of ambiguities between prefixes (i.e. kilokilo = mega), this method ignores prefixes. - * </p> - */ - @Override - public Collection<Unit> values() { - if (this.values == null) { - this.values = Collections.unmodifiableCollection(this.units.values()); - } - return this.values; - } - } - - /** - * A regular expression that separates names and expressions in unit files. - */ - private static final Pattern NAME_EXPRESSION = Pattern.compile("(\\S+)\\s+(\\S.*)"); - - /** - * The exponent operator - * - * @param base - * base of exponentiation - * @param exponentUnit - * exponent - * @return result - * @since 2019-04-10 - * @since v0.2.0 - */ - private static final LinearUnit exponentiateUnits(final LinearUnit base, final LinearUnit exponentUnit) { - // exponent function - first check if o2 is a number, - if (exponentUnit.getBase().equals(SI.SI.getBaseUnit(UnitDimension.EMPTY))) { - // then check if it is an integer, - final double exponent = exponentUnit.getConversionFactor(); - if (DecimalComparison.equals(exponent % 1, 0)) - // then exponentiate - return base.toExponent((int) (exponent + 0.5)); - else - // not an integer - throw new UnsupportedOperationException("Decimal exponents are currently not supported."); - } else - // not a number - throw new IllegalArgumentException("Exponents must be numbers."); - } - - /** - * The units in this system, excluding prefixes. - * - * @since 2019-01-07 - * @since v0.1.0 - */ - private final Map<String, Unit> prefixlessUnits; - - /** - * The unit prefixes in this system. - * - * @since 2019-01-14 - * @since v0.1.0 - */ - private final Map<String, UnitPrefix> prefixes; - - /** - * The dimensions in this system. - * - * @since 2019-03-14 - * @since v0.2.0 - */ - private final Map<String, UnitDimension> dimensions; - - /** - * A map mapping strings to units (including prefixes) - * - * @since 2019-04-13 - * @since v0.2.0 - */ - private final Map<String, Unit> units; - - /** - * A parser that can parse unit expressions. - * - * @since 2019-03-22 - * @since v0.2.0 - */ - private final ExpressionParser<LinearUnit> unitExpressionParser = new ExpressionParser.Builder<>( - this::getLinearUnit).addBinaryOperator("+", (o1, o2) -> o1.plus(o2), 0) - .addBinaryOperator("-", (o1, o2) -> o1.minus(o2), 0) - .addBinaryOperator("*", (o1, o2) -> o1.times(o2), 1).addSpaceFunction("*") - .addBinaryOperator("/", (o1, o2) -> o1.dividedBy(o2), 1) - .addBinaryOperator("^", UnitsDatabase::exponentiateUnits, 2).build(); - - /** - * A parser that can parse unit prefix expressions - * - * @since 2019-04-13 - * @since v0.2.0 - */ - private final ExpressionParser<UnitPrefix> prefixExpressionParser = new ExpressionParser.Builder<>(this::getPrefix) - .addBinaryOperator("*", (o1, o2) -> o1.times(o2), 0).addSpaceFunction("*") - .addBinaryOperator("/", (o1, o2) -> o1.dividedBy(o2), 0) - .addBinaryOperator("^", (o1, o2) -> o1.toExponent(o2.getMultiplier()), 1).build(); - - /** - * A parser that can parse unit dimension expressions. - * - * @since 2019-04-13 - * @since v0.2.0 - */ - private final ExpressionParser<UnitDimension> unitDimensionParser = new ExpressionParser.Builder<>( - this::getDimension).addBinaryOperator("*", (o1, o2) -> o1.times(o2), 0).addSpaceFunction("*") - .addBinaryOperator("/", (o1, o2) -> o1.dividedBy(o2), 0).build(); - - /** - * Creates the {@code UnitsDatabase}. - * - * @since 2019-01-10 - * @since v0.1.0 - */ - public UnitsDatabase() { - this.prefixlessUnits = new HashMap<>(); - this.prefixes = new HashMap<>(); - this.dimensions = new HashMap<>(); - this.units = new PrefixedUnitMap(this.prefixlessUnits, this.prefixes); - } - - /** - * Adds a unit dimension to the database. - * - * @param name - * dimension's name - * @param dimension - * dimension to add - * @throws NullPointerException - * if name or dimension is null - * @since 2019-03-14 - * @since v0.2.0 - */ - public void addDimension(final String name, final UnitDimension dimension) { - this.dimensions.put(Objects.requireNonNull(name, "name must not be null."), - Objects.requireNonNull(dimension, "dimension must not be null.")); - } - - /** - * Adds to the list from a line in a unit dimension file. - * - * @param line - * line to look at - * @param lineCounter - * number of line, for error messages - * @since 2019-04-10 - * @since v0.2.0 - */ - private void addDimensionFromLine(final String line, final long lineCounter) { - // ignore lines that start with a # sign - they're comments - if (line.isEmpty()) - return; - if (line.contains("#")) { - this.addDimensionFromLine(line.substring(0, line.indexOf("#")), lineCounter); - return; - } - - // divide line into name and expression - final Matcher lineMatcher = NAME_EXPRESSION.matcher(line); - if (!lineMatcher.matches()) - throw new IllegalArgumentException(String.format( - "Error at line %d: Lines of a dimension file must consist of a dimension name, then spaces or tabs, then a dimension expression.", - lineCounter)); - final String name = lineMatcher.group(1); - final String expression = lineMatcher.group(2); - - if (name.endsWith(" ")) { - System.err.printf("Warning - line %d's dimension name ends in a space", lineCounter); - } - - // if expression is "!", search for an existing dimension - // if no unit found, throw an error - if (expression.equals("!")) { - if (!this.containsDimensionName(name)) - throw new IllegalArgumentException( - String.format("! used but no dimension found (line %d).", lineCounter)); - } else { - // it's a unit, get the unit - final UnitDimension dimension; - try { - dimension = this.getDimensionFromExpression(expression); - } catch (final IllegalArgumentException e) { - System.err.printf("Parsing error on line %d:%n", lineCounter); - throw e; - } - - this.addDimension(name, dimension); - } - } - - /** - * Adds a unit prefix to the database. - * - * @param name - * prefix's name - * @param prefix - * prefix to add - * @throws NullPointerException - * if name or prefix is null - * @since 2019-01-14 - * @since v0.1.0 - */ - public void addPrefix(final String name, final UnitPrefix prefix) { - this.prefixes.put(Objects.requireNonNull(name, "name must not be null."), - Objects.requireNonNull(prefix, "prefix must not be null.")); - } - - /** - * Adds a unit to the database. - * - * @param name - * unit's name - * @param unit - * unit to add - * @throws NullPointerException - * if unit is null - * @since 2019-01-10 - * @since v0.1.0 - */ - public void addUnit(final String name, final Unit unit) { - this.prefixlessUnits.put(Objects.requireNonNull(name, "name must not be null."), - Objects.requireNonNull(unit, "unit must not be null.")); - } - - /** - * Adds to the list from a line in a unit file. - * - * @param line - * line to look at - * @param lineCounter - * number of line, for error messages - * @since 2019-04-10 - * @since v0.2.0 - */ - private void addUnitOrPrefixFromLine(final String line, final long lineCounter) { - // ignore lines that start with a # sign - they're comments - if (line.isEmpty()) - return; - if (line.contains("#")) { - this.addUnitOrPrefixFromLine(line.substring(0, line.indexOf("#")), lineCounter); - return; - } - - // divide line into name and expression - final Matcher lineMatcher = NAME_EXPRESSION.matcher(line); - if (!lineMatcher.matches()) - throw new IllegalArgumentException(String.format( - "Error at line %d: Lines of a unit file must consist of a unit name, then spaces or tabs, then a unit expression.", - lineCounter)); - final String name = lineMatcher.group(1); - final String expression = lineMatcher.group(2); - - if (name.endsWith(" ")) { - System.err.printf("Warning - line %d's unit name ends in a space", lineCounter); - } - - // if expression is "!", search for an existing unit - // if no unit found, throw an error - if (expression.equals("!")) { - if (!this.containsUnitName(name)) - throw new IllegalArgumentException(String.format("! used but no unit found (line %d).", lineCounter)); - } else { - if (name.endsWith("-")) { - final UnitPrefix prefix; - try { - prefix = this.getPrefixFromExpression(expression); - } catch (final IllegalArgumentException e) { - System.err.printf("Parsing error on line %d:%n", lineCounter); - throw e; - } - this.addPrefix(name.substring(0, name.length() - 1), prefix); - } else { - // it's a unit, get the unit - final Unit unit; - try { - unit = this.getUnitFromExpression(expression); - } catch (final IllegalArgumentException e) { - System.err.printf("Parsing error on line %d:%n", lineCounter); - throw e; - } - - this.addUnit(name, unit); - } - } - } - - /** - * Tests if the database has a unit dimension with this name. - * - * @param name - * name to test - * @return if database contains name - * @since 2019-03-14 - * @since v0.2.0 - */ - public boolean containsDimensionName(final String name) { - return this.dimensions.containsKey(name); - } - - /** - * Tests if the database has a unit prefix with this name. - * - * @param name - * name to test - * @return if database contains name - * @since 2019-01-13 - * @since v0.1.0 - */ - public boolean containsPrefixName(final String name) { - return this.prefixes.containsKey(name); - } - - /** - * Tests if the database has a unit with this name, taking prefixes into consideration - * - * @param name - * name to test - * @return if database contains name - * @since 2019-01-13 - * @since v0.1.0 - */ - public boolean containsUnitName(final String name) { - return this.units.containsKey(name); - } - - /** - * @return a map mapping dimension names to dimensions - * @since 2019-04-13 - * @since v0.2.0 - */ - public Map<String, UnitDimension> dimensionMap() { - return Collections.unmodifiableMap(this.dimensions); - } - - /** - * Gets a unit dimension from the database using its name. - * - * <p> - * This method accepts exponents, like "L^3" - * </p> - * - * @param name - * dimension's name - * @return dimension - * @since 2019-03-14 - * @since v0.2.0 - */ - public UnitDimension getDimension(final String name) { - Objects.requireNonNull(name, "name must not be null."); - if (name.contains("^")) { - final String[] baseAndExponent = name.split("\\^"); - - final UnitDimension base = this.getDimension(baseAndExponent[0]); - - final int exponent; - try { - exponent = Integer.parseInt(baseAndExponent[baseAndExponent.length - 1]); - } catch (final NumberFormatException e2) { - throw new IllegalArgumentException("Exponent must be an integer."); - } - - return base.toExponent(exponent); - } - return this.dimensions.get(name); - } - - /** - * Uses the database's data to parse an expression into a unit dimension - * <p> - * The expression is a series of any of the following: - * <ul> - * <li>The name of a unit dimension, which multiplies or divides the result based on preceding operators</li> - * <li>The operators '*' and '/', which multiply and divide (note that just putting two unit dimensions next to each - * other is equivalent to multiplication)</li> - * <li>The operator '^' which exponentiates. Exponents must be integers.</li> - * </ul> - * - * @param expression - * expression to parse - * @throws IllegalArgumentException - * if the expression cannot be parsed - * @throws NullPointerException - * if expression is null - * @since 2019-04-13 - * @since v0.2.0 - */ - public UnitDimension getDimensionFromExpression(final String expression) { - Objects.requireNonNull(expression, "expression must not be null."); - - // attempt to get a dimension as an alias first - if (this.containsDimensionName(expression)) - return this.getDimension(expression); - - // force operators to have spaces - String modifiedExpression = expression; - modifiedExpression = modifiedExpression.replaceAll("\\*", " \\* "); - modifiedExpression = modifiedExpression.replaceAll("/", " / "); - modifiedExpression = modifiedExpression.replaceAll(" *\\^ *", "\\^"); - - // fix broken spaces - modifiedExpression = modifiedExpression.replaceAll(" +", " "); - - return this.unitDimensionParser.parseExpression(modifiedExpression); - } - - /** - * Gets a unit. If it is linear, cast it to a LinearUnit and return it. Otherwise, throw an - * {@code IllegalArgumentException}. - * - * @param name - * unit's name - * @return unit - * @since 2019-03-22 - * @since v0.2.0 - */ - private LinearUnit getLinearUnit(final String name) { - // see if I am using a function-unit like tempC(100) - if (name.contains("(") && name.contains(")")) { - // break it into function name and value - final List<String> parts = Arrays.asList(name.split("\\(")); - if (parts.size() != 2) - throw new IllegalArgumentException("Format nonlinear units like: unit(value)."); - - // solve the function - final Unit unit = this.getUnit(parts.get(0)); - final double value = Double.parseDouble(parts.get(1).substring(0, parts.get(1).length() - 1)); - return unit.getBase().times(unit.convertToBase(value)); - } else { - // get a linear unit - final Unit unit = this.getUnit(name); - if (unit instanceof LinearUnit) - return (LinearUnit) unit; - else - throw new IllegalArgumentException(String.format("%s is not a linear unit.", name)); - } - } - - /** - * Gets a unit prefix from the database from its name - * - * @param name - * prefix's name - * @return prefix - * @since 2019-01-10 - * @since v0.1.0 - */ - public UnitPrefix getPrefix(final String name) { - try { - return new DefaultUnitPrefix(Double.parseDouble(name)); - } catch (final NumberFormatException e) { - return this.prefixes.get(name); - } - } - - /** - * Gets a unit prefix from a prefix expression - * <p> - * Currently, prefix expressions are much simpler than unit expressions: They are either a number or the name of - * another prefix - * </p> - * - * @param expression - * expression to input - * @return prefix - * @throws IllegalArgumentException - * if expression cannot be parsed - * @throws NullPointerException - * if any argument is null - * @since 2019-01-14 - * @since v0.1.0 - */ - public UnitPrefix getPrefixFromExpression(final String expression) { - Objects.requireNonNull(expression, "expression must not be null."); - - // attempt to get a unit as an alias first - if (this.containsUnitName(expression)) - return this.getPrefix(expression); - - // force operators to have spaces - String modifiedExpression = expression; - modifiedExpression = modifiedExpression.replaceAll("\\*", " \\* "); - modifiedExpression = modifiedExpression.replaceAll("/", " / "); - modifiedExpression = modifiedExpression.replaceAll("\\^", " \\^ "); - - // fix broken spaces - modifiedExpression = modifiedExpression.replaceAll(" +", " "); - - return this.prefixExpressionParser.parseExpression(modifiedExpression); - } - - /** - * Gets a unit from the database from its name, looking for prefixes. - * - * @param name - * unit's name - * @return unit - * @since 2019-01-10 - * @since v0.1.0 - */ - public Unit getUnit(final String name) { - try { - final double value = Double.parseDouble(name); - return SI.SI.getBaseUnit(UnitDimension.EMPTY).times(value); - } catch (final NumberFormatException e) { - return this.units.get(name); - } - - } - - /** - * Uses the database's unit data to parse an expression into a unit - * <p> - * The expression is a series of any of the following: - * <ul> - * <li>The name of a unit, which multiplies or divides the result based on preceding operators</li> - * <li>The operators '*' and '/', which multiply and divide (note that just putting two units or values next to each - * other is equivalent to multiplication)</li> - * <li>The operator '^' which exponentiates. Exponents must be integers.</li> - * <li>A number which is multiplied or divided</li> - * </ul> - * This method only works with linear units. - * - * @param expression - * expression to parse - * @throws IllegalArgumentException - * if the expression cannot be parsed - * @throws NullPointerException - * if expression is null - * @since 2019-01-07 - * @since v0.1.0 - */ - public Unit getUnitFromExpression(final String expression) { - Objects.requireNonNull(expression, "expression must not be null."); - - // attempt to get a unit as an alias first - if (this.containsUnitName(expression)) - return this.getUnit(expression); - - // force operators to have spaces - String modifiedExpression = expression; - modifiedExpression = modifiedExpression.replaceAll("\\+", " \\+ "); - modifiedExpression = modifiedExpression.replaceAll("-", " - "); - modifiedExpression = modifiedExpression.replaceAll("\\*", " \\* "); - modifiedExpression = modifiedExpression.replaceAll("/", " / "); - modifiedExpression = modifiedExpression.replaceAll("\\^", " \\^ "); - - // fix broken spaces - modifiedExpression = modifiedExpression.replaceAll(" +", " "); - - // the previous operation breaks negative numbers, fix them! - // (i.e. -2 becomes - 2) - for (int i = 2; i < modifiedExpression.length(); i++) { - if (modifiedExpression.charAt(i) == '-' - && Arrays.asList('+', '-', '*', '/', '^').contains(modifiedExpression.charAt(i - 2))) { - // found a broken negative number - modifiedExpression = modifiedExpression.substring(0, i + 1) + modifiedExpression.substring(i + 2); - } - } - - return this.unitExpressionParser.parseExpression(modifiedExpression); - } - - /** - * Adds all dimensions from a file, using data from the database to parse them. - * <p> - * Each line in the file should consist of a name and an expression (parsed by getDimensionFromExpression) separated - * by any number of tab characters. - * <p> - * <p> - * Allowed exceptions: - * <ul> - * <li>Anything after a '#' character is considered a comment and ignored.</li> - * <li>Blank lines are also ignored</li> - * <li>If an expression consists of a single exclamation point, instead of parsing it, this method will search the - * database for an existing unit. If no unit is found, an IllegalArgumentException is thrown. This is used to define - * initial units and ensure that the database contains them.</li> - * </ul> - * - * @param file - * file to read - * @throws IllegalArgumentException - * if the file cannot be parsed, found or read - * @throws NullPointerException - * if file is null - * @since 2019-01-13 - * @since v0.1.0 - */ - public void loadDimensionFile(final File file) { - Objects.requireNonNull(file, "file must not be null."); - try (FileReader fileReader = new FileReader(file); BufferedReader reader = new BufferedReader(fileReader)) { - // while the reader has lines to read, read a line, then parse it, then add it - long lineCounter = 0; - while (reader.ready()) { - this.addDimensionFromLine(reader.readLine(), ++lineCounter); - } - } catch (final FileNotFoundException e) { - throw new IllegalArgumentException("Could not find file " + file, e); - } catch (final IOException e) { - throw new IllegalArgumentException("Could not read file " + file, e); - } - } - - /** - * Adds all units from a file, using data from the database to parse them. - * <p> - * Each line in the file should consist of a name and an expression (parsed by getUnitFromExpression) separated by - * any number of tab characters. - * <p> - * <p> - * Allowed exceptions: - * <ul> - * <li>Anything after a '#' character is considered a comment and ignored.</li> - * <li>Blank lines are also ignored</li> - * <li>If an expression consists of a single exclamation point, instead of parsing it, this method will search the - * database for an existing unit. If no unit is found, an IllegalArgumentException is thrown. This is used to define - * initial units and ensure that the database contains them.</li> - * </ul> - * - * @param file - * file to read - * @throws IllegalArgumentException - * if the file cannot be parsed, found or read - * @throws NullPointerException - * if file is null - * @since 2019-01-13 - * @since v0.1.0 - */ - public void loadUnitsFile(final File file) { - Objects.requireNonNull(file, "file must not be null."); - try (FileReader fileReader = new FileReader(file); BufferedReader reader = new BufferedReader(fileReader)) { - // while the reader has lines to read, read a line, then parse it, then add it - long lineCounter = 0; - while (reader.ready()) { - this.addUnitOrPrefixFromLine(reader.readLine(), ++lineCounter); - } - } catch (final FileNotFoundException e) { - throw new IllegalArgumentException("Could not find file " + file, e); - } catch (final IOException e) { - throw new IllegalArgumentException("Could not read file " + file, e); - } - } - - /** - * @return a map mapping prefix names to prefixes - * @since 2019-04-13 - * @since v0.2.0 - */ - public Map<String, UnitPrefix> prefixMap() { - return Collections.unmodifiableMap(this.prefixes); - } - - @Override - public String toString() { - return String.format("Unit Database with %d units and %d unit prefixes", this.prefixlessUnits.size(), - this.prefixes.size()); - } - - /** - * Returns a map mapping unit names to units, including units with prefixes. - * <p> - * The returned map is infinite in size if there is at least one unit and at least one prefix. If it is infinite, - * some operations that only work with finite collections, like converting name/entry sets to arrays, will throw an - * {@code IllegalStateException}. - * </p> - * <p> - * Specifically, the operations that will throw an IllegalStateException if the map is infinite in size are: - * <ul> - * <li>{@code unitMap.entrySet().toArray()} (either overloading)</li> - * <li>{@code unitMap.keySet().toArray()} (either overloading)</li> - * </ul> - * </p> - * <p> - * Because of ambiguities between prefixes (i.e. kilokilo = mega), the map's {@link PrefixedUnitMap#containsValue - * containsValue} and {@link PrefixedUnitMap#values() values()} methods currently ignore prefixes. - * </p> - * - * @return a map mapping unit names to units, including prefixed names - * @since 2019-04-13 - * @since v0.2.0 - */ - public Map<String, Unit> unitMap() { - return this.units; // PrefixedUnitMap is immutable so I don't need to make an unmodifiable map. - } - - /** - * @return a map mapping unit names to units, ignoring prefixes - * @since 2019-04-13 - * @since v0.2.0 - */ - public Map<String, Unit> unitMapPrefixless() { - return Collections.unmodifiableMap(this.prefixlessUnits); - } -} |