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  * Copyright (C) 2007 The Guava Authors
  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
import  javax.annotation.Nullable;

Determines an output value based on an input value.

The Functions class provides common functions and related utilites.

See the Guava User Guide article on the use of Function.

Kevin Bourrillion
2.0 (imported from Google Collections Library)
public interface Function<F, T> {
Returns the result of applying this function to input. This method is generally expected, but not absolutely required, to have the following properties:
  • Its execution does not cause any observable side effects.
  • The computation is consistent with equals; that is, Objects.equal(a, b) implies that Objects.equal(function.apply(a), function.apply(b)).

NullPointerException if input is null and this function does not accept null arguments
  @Nullable T apply(@Nullable F input);

Indicates whether another object is equal to this function.

Most implementations will have no reason to override the behavior of Object.equals. However, an implementation may also choose to return true whenever object is a Function that it considers interchangeable with this one. "Interchangeable" typically means that Objects.equal(this.apply(f), that.apply(f)) is true for all f of type F. Note that a false result from this method does not imply that the functions are known not to be interchangeable.

  boolean equals(@Nullable Object object);
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