April 15, 2014 23:37 · Apr 15, 2014
diff --git a/AbstractHasKey.java b/AbstractHasKey.java
@@ -0,0 +1,38 @@
+/*
+ */
+
+package st.voo.tick.entity.util;
+
+import com.googlecode.objectify.Key;
+import com.googlecode.objectify.Ref;
+
+/**
+ * A simple way to remove some boilerplate from some entity.
+ */
+abstract public class AbstractHasKey<T extends HasKey<T>> implements HasKey<T>
+{
+	/* (non-Javadoc)
+	 * @see st.voo.tick.entity.util.HasKey#getRef()
+	 */
+	@Override
+	public Ref<T> getRef() {
+		return Ref.create(getKey());
+	}
+
+	/* (non-Javadoc)
+	 * @see st.voo.tick.entity.util.HasKey#equivalent(com.googlecode.objectify.Key)
+	 */
+	@Override
+	public boolean equivalent(Key<T> key) {
+		return getKey().equals(key);
+	}
+
+	/* (non-Javadoc)
+	 * @see st.voo.tick.entity.util.HasKey#equivalent(com.googlecode.objectify.Ref)
+	 */
+	@Override
+	public boolean equivalent(Ref<T> ref) {
+		return getKey().equivalent(ref);
+	}
+
+}
diff --git a/HasKey.java b/HasKey.java
@@ -0,0 +1,26 @@
+/*
+ */
+
+package st.voo.tick.entity.util;
+
+import com.googlecode.objectify.Key;
+import com.googlecode.objectify.Ref;
+
+
+/**
+ * Defines a common interface for entities to expose their key
+ */
+public interface HasKey<T extends HasKey<T>>
+{
+	/** Gets the key for the entity, duh */
+	Key<T> getKey();
+
+	/** Gets the ref version. Might need to rename this to ref() to avoid javabeans signature. */
+	Ref<T> getRef();
+
+	/** @return true if this entity is key-equivalent */
+	boolean equivalent(Key<T> key);
+
+	/** @return true if this entity is key-equivalent */
+	boolean equivalent(Ref<T> ref);
+}