Add an additional toggle type

1 files changed, 53 insertions, 0 deletions

diff --git a/base/src/main/java/bjc/utils/data/OneWayToggle.java b/base/src/main/java/bjc/utils/data/OneWayToggle.java
new file mode 100644
index 0000000..edec4dd
--- /dev/null
+++ b/base/src/main/java/bjc/utils/data/OneWayToggle.java
@@ -0,0 +1,53 @@
+package bjc.utils.data;
+
+/**
+ * A toggle that will only give the first value once, only yielding the second
+ * value afterwards.
+ * 
+ * @author student
+ *
+ * @param <E>
+ *            The type of value stored
+ */
+public class OneWayToggle<E> implements Toggle<E> {
+	private E first;
+	private E second;
+
+	private boolean gotFirst;
+
+	/**
+	 * Create a new one-way toggle
+	 * 
+	 * @param first
+	 *            The value to offer first, and only once
+	 * @param second
+	 *            The value to offer second and repeatedly
+	 */
+	public OneWayToggle(E first, E second) {
+		this.first = first;
+
+		this.second = second;
+	}
+
+	@Override
+	public E get() {
+		if (gotFirst)
+			return second;
+
+		gotFirst = true;
+		return first;
+	}
+
+	@Override
+	public E peek() {
+		if (gotFirst)
+			return second;
+		return first;
+	}
+
+	@Override
+	public void set(boolean gotFirst) {
+		this.gotFirst = gotFirst;
+	}
+
+}