001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.imaging.palette; 018 019import java.io.Serializable; 020import java.util.Comparator; 021 022/** 023 * A comparator for {#link ColorCount} elements. 024 * 025 * <p>It uses a given {#link ColorComponent} to choose what 026 * channel must be used for the comparison.</p> 027 * 028 * <p>For example, if the comparator is created for the 029 * {@code ColorComponent.RED} channel, then it will 030 * compare the value of red of each {@code ColorCount} 031 * object in the array of elements.</p> 032 * 033 * @since 1.0-alpha2 034 */ 035public class ColorCountComparator implements Comparator<ColorCount>, Serializable { 036 private static final long serialVersionUID = 1L; 037 /** 038 * Color component used during the comparison. 039 */ 040 private ColorComponent colorComponent; 041 042 public ColorCountComparator(final ColorComponent colorComponent) { 043 this.colorComponent = colorComponent; 044 } 045 046 @Override 047 public int compare(ColorCount c1, ColorCount c2) { 048 switch (colorComponent) { 049 case ALPHA: 050 return c1.alpha - c2.alpha; 051 case RED: 052 return c1.red - c2.red; 053 case GREEN: 054 return c1.green - c2.green; 055 case BLUE: 056 return c1.blue - c2.blue; 057 default: 058 return 0; 059 } 060 } 061 062}