java.util.function.Function Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jacline-jrejs Show documentation

The newest version!

/*
 * Copyright 2015 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package java.util.function;

import static javaemul.internal.InternalPreconditions.checkCriticalNotNull;

/**
 * See 
 * the official Java API doc for details.
 *
 * @param  type of the argument
 * @param  type of the return value
 */
@FunctionalInterface
public interface Function {

  static  Function identity() {
    return t -> t;
  }

  R apply(T t);

  default  Function andThen(Function after) {
    checkCriticalNotNull(after);
    return t -> after.apply(apply(t));
  }

  default  Function compose(Function before) {
    checkCriticalNotNull(before);
    return t -> apply(before.apply(t));
  }
}