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Java example source code file (Function.java)
The Function.java Java example source code/* * 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 * * 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 com.google.common.base; import com.google.common.annotations.GwtCompatible; import com.google.errorprone.annotations.CanIgnoreReturnValue; import javax.annotation.Nullable; /** * Determines an output value based on an input value; a pre-Java-8 version of {@code * java.util.function.Function}. * * <p>The {@link Functions} class provides common functions and related utilites. * * <p>See the Guava User Guide article on * <a href="https://github.com/google/guava/wiki/FunctionalExplained">the use of {@code * Function}</a>. * * <h3>For Java 8+ users * * <p>This interface is now a legacy type. Use {@code java.util.function.Function} (or the * appropriate primitive specialization such as {@code ToIntFunction}) instead whenever possible. * Otherwise, at least reduce <i>explicit dependencies on this type by using lambda expressions * or method references instead of classes, leaving your code easier to migrate in the future. * * <p>To use an existing function (say, named {@code function}) in a context where the other * type</i> of function is expected, use the method reference {@code function::apply}. A future * version of {@code com.google.common.base.Function} will be made to <i>extend {@code * java.util.function.Function}, making conversion code necessary only in one direction. At that * time, this interface will be officially discouraged. * * @author Kevin Bourrillion * @since 2.0 */ @GwtCompatible public interface Function<F, T> { /** * Returns the result of applying this function to {@code input}. This method is <i>generally * expected</i>, but not absolutely required, to have the following properties: * * <ul> * <li>Its execution does not cause any observable side effects. * <li>The computation is consistent with equals; that is, {@link Objects#equal * Objects.equal}{@code (a, b)} implies that {@code Objects.equal(function.apply(a), * function.apply(b))}. * </ul> * * @throws NullPointerException if {@code input} is null and this function does not accept null * arguments */ @Nullable @CanIgnoreReturnValue T apply(@Nullable F input); /** * Indicates whether another object is equal to this function. * * <p>Most implementations will have no reason to override the behavior of {@link Object#equals}. * However, an implementation may also choose to return {@code true} whenever {@code object} is a * {@link Function} that it considers <i>interchangeable with this one. "Interchangeable" * <i>typically means that {@code Objects.equal(this.apply(f), that.apply(f))} is true for all * {@code f} of type {@code F}. Note that a {@code false} result from this method does not imply * that the functions are known <i>not to be interchangeable. */ @Override boolean equals(@Nullable Object object); } Other Java examples (source code examples)Here is a short list of links related to this Java Function.java source code file: |
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