    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.formats.tiff.photometricinterpreters.floatingpoint;
    018
    019import java.awt.Color;
    020
    021/**
    022 * Provides a palette entry for a color assignment to a single value. This class
    023 * will assign a color to a value only if it is an exact match for the input.
    024 * This class will also support Float.NaN
    025 */
    026public class PaletteEntryForValue implements PaletteEntry {
    027
    028    private final float value;
    029    private final int iColor;
    030    private final Color color;
    031    private final boolean isNull;
    032
    033    /**
    034     * Constructs a palette entry for a single value.
    035     * <p>
    036     * This class will support color-assignments for Float.NaN.
    037     *
    038     * @param value the color value associated with this palette entry; a
    039     * Float&#46;NaN is allowed.
    040     * @param color the color assigned to value
    041     */
    042    public PaletteEntryForValue(final float value, final Color color) {
    043        if (color == null) {
    044            throw new IllegalArgumentException("Null colors not allowed");
    045        }
    046        this.value = value;
    047        this.color = color;
    048        this.iColor = color.getRGB();
    049        isNull = Float.isNaN(value);
    050
    051    }
    052
    053    @Override
    054    public boolean isCovered(final float f) {
    055        if (isNull) {
    056            return Float.isNaN(f);
    057        }
    058        return f == value;
    059    }
    060
    061    @Override
    062    public int getARGB(final float f) {
    063        if (isNull && Float.isNaN(f)) {
    064            return iColor;
    065        }
    066        if (f == value) {
    067            return iColor;
    068        }
    069        return 0;
    070    }
    071
    072    @Override
    073    public Color getColor(final float f) {
    074        if (isNull && Float.isNaN(f)) {
    075            return color;
    076        }
    077        if (f == value) {
    078            return color;
    079        }
    080        return null;
    081    }
    082
    083    @Override
    084    public boolean coversSingleEntry() {
    085        return true;
    086    }
    087
    088    @Override
    089    public float getLowerBound() {
    090        return value;
    091    }
    092
    093    @Override
    094    public float getUpperBound() {
    095        return value;
    096    }
    097
    098    @Override
    099    public String toString() {
    100        return "PaletteEntry for single value" + value;
    101    }
    102}