194 lines
6.6 KiB
Java
194 lines
6.6 KiB
Java
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache POI" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache POI", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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package org.apache.poi.hssf.usermodel;
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import org.apache.poi.hssf.record.PaletteRecord;
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import org.apache.poi.hssf.util.HSSFColor;
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/**
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* Represents a workbook color palette.
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* Internally, the XLS format refers to colors using an offset into the palette
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* record. Thus, the first color in the palette has the index 0x8, the second
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* has the index 0x9, etc. through 0x40
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*
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* @author Brian Sanders (bsanders at risklabs dot com)
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*/
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public class HSSFPalette
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{
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private PaletteRecord palette;
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protected HSSFPalette(PaletteRecord palette)
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{
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this.palette = palette;
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}
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/**
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* Retrieves the color at a given index
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*
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* @param index the palette index, between 0x8 to 0x40 inclusive
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* @return the color, or null if the index is not populated
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*/
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public HSSFColor getColor(short index)
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{
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byte[] b = palette.getColor(index);
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if (b != null)
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{
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return new CustomColor(index, b);
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}
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return null;
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}
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/**
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* Finds the first occurance of a given color
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*
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* @param red the RGB red component, between 0 and 255 inclusive
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* @param green the RGB green component, between 0 and 255 inclusive
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* @param blue the RGB blue component, between 0 and 255 inclusive
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* @return the color, or null if the color does not exist in this palette
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*/
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public HSSFColor findColor(byte red, byte green, byte blue)
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{
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byte[] b = palette.getColor(PaletteRecord.FIRST_COLOR_INDEX);
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for (short i = (short) PaletteRecord.FIRST_COLOR_INDEX; b != null;
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b = palette.getColor(++i))
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{
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if (b[0] == red && b[1] == blue && b[2] == green)
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{
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return new CustomColor(i, b);
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}
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}
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return null;
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}
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/**
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* Sets the color at the given offset
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*
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* @param index the palette index, between 0x8 to 0x40 inclusive
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* @param red the RGB red component, between 0 and 255 inclusive
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* @param green the RGB green component, between 0 and 255 inclusive
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* @param blue the RGB blue component, between 0 and 255 inclusive
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*/
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public void setColorAtIndex(short index, byte red, byte green, byte blue)
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{
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palette.setColor(index, red, green, blue);
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}
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private static class CustomColor extends HSSFColor
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{
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private short byteOffset;
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private byte red;
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private byte green;
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private byte blue;
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private CustomColor(short byteOffset, byte[] colors)
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{
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this(byteOffset, colors[0], colors[1], colors[2]);
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}
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private CustomColor(short byteOffset, byte red, byte green, byte blue)
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{
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this.byteOffset = byteOffset;
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this.red = red;
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this.green = green;
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this.blue = blue;
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}
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public short getIndex()
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{
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return byteOffset;
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}
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public short[] getTriplet()
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{
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return new short[]
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{
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(short) (red & 0xff),
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(short) (green & 0xff),
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(short) (blue & 0xff)
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};
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}
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public String getHexString()
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{
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StringBuffer sb = new StringBuffer();
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sb.append(getGnumericPart(red));
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sb.append(':');
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sb.append(getGnumericPart(green));
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sb.append(':');
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sb.append(getGnumericPart(blue));
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return sb.toString();
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}
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private String getGnumericPart(byte color)
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{
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String s;
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if (color == 0)
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{
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s = "0";
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}
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else
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{
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int c = color & 0xff; //as unsigned
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c = (c << 8) | c; //pad to 16-bit
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s = Integer.toHexString(c).toUpperCase();
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while (s.length() < 4)
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{
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s = "0" + s;
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}
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}
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return s;
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}
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}
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}
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