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Commons IO example source code file (ReverseComparator.java)
The Commons IO ReverseComparator.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.io.comparator; import java.io.File; import java.io.Serializable; import java.util.Comparator; /** * Reverses the result of comparing two objects using * the delegate {@link Comparator}. * * @version $Revision: 1021884 $ $Date: 2010-10-12 19:49:16 +0100 (Tue, 12 Oct 2010) $ * @since Commons IO 1.4 */ class ReverseComparator extends AbstractFileComparator implements Serializable { private final Comparator<File> delegate; /** * Construct an instance with the sepecified delegate {@link Comparator}. * * @param delegate The comparator to delegate to */ public ReverseComparator(Comparator<File> delegate) { if (delegate == null) { throw new IllegalArgumentException("Delegate comparator is missing"); } this.delegate = delegate; } /** * Compare using the delegate Comparator, but reversing the result. * * @param file1 The first file to compare * @param file2 The second file to compare * @return the result from the delegate {@link Comparator#compare(Object, Object)} * reversing the value (i.e. positive becomes negative and vice versa) */ public int compare(File file1, File file2) { return delegate.compare(file2, file1); // parameters switched round } /** * String representation of this file comparator. * * @return String representation of this file comparator */ @Override public String toString() { return super.toString() + "[" + delegate.toString() + "]"; } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO ReverseComparator.java source code file: |
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