--- a/jdk/src/share/classes/java/util/function/LongUnaryOperator.java Wed May 15 10:25:59 2013 +0200
+++ b/jdk/src/share/classes/java/util/function/LongUnaryOperator.java Fri May 17 10:36:04 2013 -0700
@@ -24,6 +24,8 @@
*/
package java.util.function;
+import java.util.Objects;
+
/**
* An operation on a single {@code long} operand yielding a {@code long} result.
* This is the primitive type specialization of {@link UnaryOperator} for
@@ -42,5 +44,46 @@
* @param operand the operand value
* @return the operation result value
*/
- public long applyAsLong(long operand);
+ long applyAsLong(long operand);
+
+ /**
+ * Compose a new function which applies the provided function followed by
+ * this function. If either function throws an exception, it is relayed
+ * to the caller.
+ *
+ * @param before An additional function to be applied before this function
+ * is applied
+ * @return A function which performs the provided function followed by this
+ * function
+ * @throws NullPointerException if before is null
+ */
+ default LongUnaryOperator compose(LongUnaryOperator before) {
+ Objects.requireNonNull(before);
+ return (long v) -> applyAsLong(before.applyAsLong(v));
+ }
+
+ /**
+ * Compose a new function which applies this function followed by the
+ * provided function. If either function throws an exception, it is relayed
+ * to the caller.
+ *
+ * @param after An additional function to be applied after this function is
+ * applied
+ * @return A function which performs this function followed by the provided
+ * function followed
+ * @throws NullPointerException if after is null
+ */
+ default LongUnaryOperator andThen(LongUnaryOperator after) {
+ Objects.requireNonNull(after);
+ return (long t) -> after.applyAsLong(applyAsLong(t));
+ }
+
+ /**
+ * Returns a unary operator that provides its input value as the result.
+ *
+ * @return a unary operator that provides its input value as the result
+ */
+ static LongUnaryOperator identity() {
+ return t -> t;
+ }
}