1 files changed, 76 insertions, 0 deletions
diff --git a/src/org/unitConverter/newUnits/AbstractUnit.java b/src/org/unitConverter/newUnits/AbstractUnit.java
new file mode 100644
index 0000000..909ea8b
--- /dev/null
+++ b/src/org/unitConverter/newUnits/AbstractUnit.java
@@ -0,0 +1,76 @@
+/**
+ * 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.newUnits;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+import org.unitConverter.dimension.BaseDimension;
+import org.unitConverter.math.ObjectProduct;
+
+/**
+ * @author Adrien Hopkins
+ * @since 2019-10-16
+ */
+public abstract class AbstractUnit implements Unit {
+	/**
+	 * The combination of units that this unit is based on.
+	 */
+	private final ObjectProduct<BaseUnit> unitBase;
+
+	/**
+	 * Cache storing the result of getDimension()
+	 */
+	private transient ObjectProduct<BaseDimension> dimension = null;
+
+	/**
+	 * Creates the {@code AbstractUnit}.
+	 * 
+	 * @param unitBase
+	 * @since 2019-10-16
+	 * @throws NullPointerException
+	 *             if unitBase is null
+	 */
+	public AbstractUnit(final ObjectProduct<BaseUnit> unitBase) {
+		this.unitBase = Objects.requireNonNull(unitBase, "unitBase must not be null.");
+	}
+
+	/**
+	 * @return unitBase
+	 * @since 2019-10-16
+	 */
+	@Override
+	public final ObjectProduct<BaseUnit> getBase() {
+		return this.unitBase;
+	}
+
+	@Override
+	public ObjectProduct<BaseDimension> getDimension() {
+		if (this.dimension == null) {
+			final Map<BaseUnit, Integer> mapping = this.unitBase.exponentMap();
+			final Map<BaseDimension, Integer> dimensionMap = new HashMap<>();
+
+			for (final BaseUnit key : mapping.keySet()) {
+				dimensionMap.put(key.getBaseDimension(), mapping.get(key));
+			}
+
+			this.dimension = ObjectProduct.fromExponentMapping(dimensionMap);
+		}
+		return this.dimension;
+	}
+}