Caching last hashing result

Author: GreenWizard2015

YASL-Core/src/YASL/Hashing/ChgCachedHash.java

@@ -0,0 +1,27 @@
+package YASL.Hashing;
+
+public class ChgCachedHash<T> implements IHashingGenerator<T> {
+	private final IHashingGenerator<T> _gen;
+
+	public ChgCachedHash(IHashingGenerator<T> gen) {
+		this._gen = gen;
+	}
+
+	@Override
+	public IHasher<T> generate(int range, int levels) {
+		final IHasher<T> gen = _gen.generate(range, levels);
+		return new IHasher<T>() {
+			private T			_lastRequest	= null;
+			private int[]	_lastResult		= null;
+
+			@Override
+			public int[] apply(T x) {
+				if (!x.equals(_lastRequest)) {
+					_lastRequest = x;
+					_lastResult = gen.apply(x);
+				}
+				return _lastResult;
+			}
+		};
+	}
+}