src/share/classes/java/util/function/LongUnaryOperator.java
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rev 7675 : 8019840: Spec updates for java.util.function
Reviewed-by: mduigou
Contributed-by: brian.goetz@oracle.com
*** 25,89 ****
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
! * {@code long}.
*
* @see UnaryOperator
* @since 1.8
*/
@FunctionalInterface
public interface LongUnaryOperator {
/**
! * Returns the {@code long} result of the operation upon the {@code long}
! * operand.
*
! * @param operand the operand value
! * @return the operation result value
*/
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;
}
}
--- 25,95 ----
package java.util.function;
import java.util.Objects;
/**
! * Represents an operation on a single {@code long}-valued operand that produces
! * a {@code long}-valued result. This is the primitive type specialization of
! * {@link UnaryOperator} for {@code long}.
! *
! * <p>This is a <a href="package-summary.html">functional interface</a>
! * whose functional method is {@link #applyAsLong(long)}.
*
* @see UnaryOperator
* @since 1.8
*/
@FunctionalInterface
public interface LongUnaryOperator {
/**
! * Applies this operator to the given operand.
*
! * @param operand the operand
! * @return the operator result
*/
long applyAsLong(long operand);
/**
! * Returns a composed operator that first applies the {@code before}
! * operator to its input, and then applies this operator to the result.
! * If evaluation of either operator throws an exception, it is relayed to
! * the caller of the composed operator.
! *
! * @param before the operator to apply before this operator is applied
! * @return a composed operator that first applies the {@code before}
! * operator and then applies this operator
* @throws NullPointerException if before is null
+ *
+ * @see #andThen(LongUnaryOperator)
*/
default LongUnaryOperator compose(LongUnaryOperator before) {
Objects.requireNonNull(before);
return (long v) -> applyAsLong(before.applyAsLong(v));
}
/**
! * Returns a composed operator that first applies this operator to
! * its input, and then applies the {@code after} operator to the result.
! * If evaluation of either operator throws an exception, it is relayed to
! * the caller of the composed operator.
! *
! * @param after the operator to apply after this operator is applied
! * @return a composed operator that first applies this operator and then
! * applies the {@code after} operator
* @throws NullPointerException if after is null
+ *
+ * @see #compose(LongUnaryOperator)
*/
default LongUnaryOperator andThen(LongUnaryOperator after) {
Objects.requireNonNull(after);
return (long t) -> after.applyAsLong(applyAsLong(t));
}
/**
! * Returns a unary operator that always returns its input argument.
*
! * @return a unary operator that always returns its input argument
*/
static LongUnaryOperator identity() {
return t -> t;
}
}