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Commons Collections example source code file (PredicateTransformer.java)
The Commons Collections PredicateTransformer.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.commons.collections.functors; import java.io.Serializable; import org.apache.commons.collections.Predicate; import org.apache.commons.collections.Transformer; /** * Transformer implementation that calls a Predicate using the input object * and then returns the input. * * @since Commons Collections 3.0 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $ * * @author Stephen Colebourne */ public class PredicateTransformer implements Transformer, Serializable { /** Serial version UID */ private static final long serialVersionUID = 5278818408044349346L; /** The closure to wrap */ private final Predicate iPredicate; /** * Factory method that performs validation. * * @param predicate the predicate to call, not null * @return the <code>predicate transformer * @throws IllegalArgumentException if the predicate is null */ public static Transformer getInstance(Predicate predicate) { if (predicate == null) { throw new IllegalArgumentException("Predicate must not be null"); } return new PredicateTransformer(predicate); } /** * Constructor that performs no validation. * Use <code>getInstance if you want that. * * @param predicate the predicate to call, not null */ public PredicateTransformer(Predicate predicate) { super(); iPredicate = predicate; } /** * Transforms the input to result by calling a predicate. * * @param input the input object to transform * @return the transformed result */ public Object transform(Object input) { return (iPredicate.evaluate(input) ? Boolean.TRUE : Boolean.FALSE); } /** * Gets the predicate. * * @return the predicate * @since Commons Collections 3.1 */ public Predicate getPredicate() { return iPredicate; } } Other Commons Collections examples (source code examples)Here is a short list of links related to this Commons Collections PredicateTransformer.java source code file: |
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