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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
/*
* 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.imaging.palette;
import java.io.Serializable;
import java.util.Comparator;
/**
* A comparator for {#link ColorCount} elements.
*
* It uses a given {#link ColorComponent} to choose what
* channel must be used for the comparison.
*
* For example, if the comparator is created for the
* {@code ColorComponent.RED} channel, then it will
* compare the value of red of each {@code ColorCount}
* object in the array of elements.
*
* @since 1.0-alpha2
*/
public class ColorCountComparator implements Comparator, Serializable {
private static final long serialVersionUID = 1L;
/**
* Color component used during the comparison.
*/
private ColorComponent colorComponent;
public ColorCountComparator(final ColorComponent colorComponent) {
this.colorComponent = colorComponent;
}
@Override
public int compare(ColorCount c1, ColorCount c2) {
switch (colorComponent) {
case ALPHA:
return c1.alpha - c2.alpha;
case RED:
return c1.red - c2.red;
case GREEN:
return c1.green - c2.green;
case BLUE:
return c1.blue - c2.blue;
default:
return 0;
}
}
}