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.util.Objects;
020
021public class SimplePalette implements Palette {
022
023    private final int[] palette;
024
025    /**
026     * Constructs a new instance.
027     *
028     * @param palette palette to copy and store.
029     */
030    public SimplePalette(final int[] palette) {
031        this.palette = Objects.requireNonNull(palette, "palette").clone();
032    }
033
034    @Override
035    public int getEntry(final int index) {
036        return palette[index];
037    }
038
039    @Override
040    public int getPaletteIndex(final int rgb) {
041        for (int i = 0; i < palette.length; i++) {
042            if (palette[i] == rgb) {
043                return i;
044            }
045        }
046        return -1;
047    }
048
049    @Override
050    public int length() {
051        return palette.length;
052    }
053}