Code maintenace and changes

1 files changed, 115 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/Identity.java b/BJC-Utils2/src/main/java/bjc/utils/data/Identity.java
new file mode 100644
index 0000000..dcc7bef
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/data/Identity.java
@@ -0,0 +1,115 @@
+package bjc.utils.data;
+
+import java.util.function.Function;
+import java.util.function.UnaryOperator;
+
+/**
+ * @author ben
+ *
+ * @param <ContainedType>
+ */
+/**
+ * Simple implementation of IHolder that has no hidden behavior
+ * 
+ * @author ben
+ *
+ * @param <ContainedType>
+ *            The type contained in the holder
+ */
+public class Identity<ContainedType> implements IHolder<ContainedType> {
+	private ContainedType heldValue;
+
+	/**
+	 * Create a holder holding null
+	 */
+	public Identity() {
+		heldValue = null;
+	}
+
+	/**
+	 * Create a holder holding the specified value
+	 * 
+	 * @param value
+	 *            The value to hold
+	 */
+	public Identity(ContainedType value) {
+		heldValue = value;
+	}
+
+	@Override
+	public <BoundType> IHolder<BoundType> bind(
+			Function<ContainedType, IHolder<BoundType>> binder) {
+		return binder.apply(heldValue);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#equals(java.lang.Object)
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		} else if (obj == null) {
+			return false;
+		} else if (getClass() != obj.getClass()) {
+			return false;
+		}
+
+		Identity<?> other = (Identity<?>) obj;
+
+		if (heldValue == null) {
+			if (other.heldValue != null) {
+				return false;
+			}
+		} else if (!heldValue.equals(other.heldValue)) {
+			return false;
+		}
+
+		return true;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see java.lang.Object#hashCode()
+	 */
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+
+		int result = 1;
+
+		int fieldHash = (heldValue == null) ? 0 : heldValue.hashCode();
+
+		result = prime * result + fieldHash;
+
+		return result;
+	}
+
+	@Override
+	public <MappedType> IHolder<MappedType> map(
+			Function<ContainedType, MappedType> mapper) {
+		return new Identity<>(mapper.apply(heldValue));
+	}
+
+	@Override
+	public String toString() {
+		return "holding[v=" + heldValue + "]";
+	}
+
+	@Override
+	public IHolder<ContainedType> transform(
+			UnaryOperator<ContainedType> transformer) {
+		heldValue = transformer.apply(heldValue);
+
+		return this;
+	}
+
+	@Override
+	public <UnwrappedType> UnwrappedType unwrap(
+			Function<ContainedType, UnwrappedType> unwrapper) {
+		return unwrapper.apply(heldValue);
+	}
+}
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