1 files changed, 63 insertions, 6 deletions
diff --git a/src/unitConverter/UnitsDatabase.java b/src/unitConverter/UnitsDatabase.java
index 4816db1..9f5a6a2 100755
--- a/src/unitConverter/UnitsDatabase.java
+++ b/src/unitConverter/UnitsDatabase.java
@@ -37,7 +37,7 @@ import unitConverter.unit.Unit;
 import unitConverter.unit.UnitPrefix;
 
 /**
- * A database of units.
+ * A database of units and prefixes, and their names.
  * 
  * @author Adrien Hopkins
  * @since 2019-01-07
@@ -61,6 +61,13 @@ public final class UnitsDatabase {
 	private final Map<String, UnitPrefix> prefixes;
 
 	/**
+	 * The dimensions in this system.
+	 * 
+	 * @since 2019-03-14
+	 */
+	private final Map<String, UnitDimension> dimensions;
+
+	/**
 	 * Creates the {@code UnitsDatabase}.
 	 * 
 	 * @since 2019-01-10
@@ -69,6 +76,7 @@ public final class UnitsDatabase {
 	public UnitsDatabase() {
 		this.units = new HashMap<>();
 		this.prefixes = new HashMap<>();
+		this.dimensions = new HashMap<>();
 	}
 
 	/**
@@ -164,14 +172,30 @@ public final class UnitsDatabase {
 	}
 
 	/**
-	 * Adds a unit prefix to the database using a custom name
+	 * 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
+	 */
+	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 a unit prefix to the database.
 	 * 
 	 * @param name
 	 *            prefix's name
 	 * @param prefix
 	 *            prefix to add
 	 * @throws NullPointerException
-	 *             if name or unit is null
+	 *             if name or prefix is null
 	 * @since 2019-01-14
 	 * @since v0.1.0
 	 */
@@ -181,7 +205,7 @@ public final class UnitsDatabase {
 	}
 
 	/**
-	 * Adds a unit to the database using a custom name
+	 * Adds a unit to the database.
 	 * 
 	 * @param name
 	 *            unit's name
@@ -193,7 +217,20 @@ public final class UnitsDatabase {
 	 * @since v0.1.0
 	 */
 	public void addUnit(final String name, final Unit unit) {
-		this.units.put(name, Objects.requireNonNull(unit, "unit must not be null."));
+		this.units.put(Objects.requireNonNull(name, "name must not be null."),
+				Objects.requireNonNull(unit, "unit must not be null."));
+	}
+
+	/**
+	 * 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
+	 */
+	public boolean containsDimensionName(final String name) {
+		return this.dimensions.containsKey(name);
 	}
 
 	/**
@@ -210,7 +247,7 @@ public final class UnitsDatabase {
 	}
 
 	/**
-	 * Tests if the database has a unit prefix with this name
+	 * Tests if the database has a unit prefix with this name.
 	 * 
 	 * @param name
 	 *            name to test
@@ -242,6 +279,26 @@ public final class UnitsDatabase {
 	}
 
 	/**
+	 * @return an immutable set of all of the dimension names in this database.
+	 * @since 2019-03-14
+	 */
+	public Set<String> dimensionNameSet() {
+		return Collections.unmodifiableSet(this.dimensions.keySet());
+	}
+
+	/**
+	 * Gets a unit dimension from the database using its name.
+	 * 
+	 * @param name
+	 *            dimension's name
+	 * @return dimension
+	 * @since 2019-03-14
+	 */
+	public UnitDimension getDimension(final String name) {
+		return this.dimensions.get(name);
+	}
+
+	/**
 	 * Gets a unit prefix from the database from its name
 	 * 
 	 * @param name