marcel.lang.util.function.CharUnaryOperator Maven / Gradle / Ivy
package marcel.lang.util.function;
import java.util.Objects;
@FunctionalInterface
public interface CharUnaryOperator {
/**
* Applies this operator to the given operand.
*
* @param operand the operand
* @return the operator result
*/
char applyAsChar(char 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(CharUnaryOperator)
*/
default CharUnaryOperator compose(CharUnaryOperator before) {
Objects.requireNonNull(before);
return (char v) -> applyAsChar(before.applyAsChar(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(CharUnaryOperator)
*/
default CharUnaryOperator andThen(CharUnaryOperator after) {
Objects.requireNonNull(after);
return (char t) -> after.applyAsChar(applyAsChar(t));
}
/**
* Returns a unary operator that always returns its input argument.
*
* @return a unary operator that always returns its input argument
*/
static CharUnaryOperator identity() {
return t -> t;
}
}