|
Commons Collections example source code file (TransformingComparator.java)
The Commons Collections TransformingComparator.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.comparators; import java.util.Comparator; import org.apache.commons.collections.Transformer; /** * Decorates another Comparator with transformation behavior. That is, the * return value from the transform operation will be passed to the decorated * {@link Comparator#compare(Object,Object) compare} method. * * @since Commons Collections 2.0 (?) * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $ * * @see org.apache.commons.collections.Transformer * @see org.apache.commons.collections.comparators.ComparableComparator */ public class TransformingComparator implements Comparator { /** The decorated comparator. */ protected Comparator decorated; /** The transformer being used. */ protected Transformer transformer; //----------------------------------------------------------------------- /** * Constructs an instance with the given Transformer and a * {@link ComparableComparator ComparableComparator}. * * @param transformer what will transform the arguments to <code>compare */ public TransformingComparator(Transformer transformer) { this(transformer, new ComparableComparator()); } /** * Constructs an instance with the given Transformer and Comparator. * * @param transformer what will transform the arguments to <code>compare * @param decorated the decorated Comparator */ public TransformingComparator(Transformer transformer, Comparator decorated) { this.decorated = decorated; this.transformer = transformer; } //----------------------------------------------------------------------- /** * Returns the result of comparing the values from the transform operation. * * @param obj1 the first object to transform then compare * @param obj2 the second object to transform then compare * @return negative if obj1 is less, positive if greater, zero if equal */ public int compare(Object obj1, Object obj2) { Object value1 = this.transformer.transform(obj1); Object value2 = this.transformer.transform(obj2); return this.decorated.compare(value1, value2); } } Other Commons Collections examples (source code examples)Here is a short list of links related to this Commons Collections TransformingComparator.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.