Source for org.jfree.chart.encoders.SunPNGEncoderAdapter

   1: /* ===========================================================
   2:  * JFreeChart : a free chart library for the Java(tm) platform
   3:  * ===========================================================
   4:  *
   5:  * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
   6:  *
   7:  * Project Info:  http://www.jfree.org/jfreechart/index.html
   8:  *
   9:  * This library is free software; you can redistribute it and/or modify it 
  10:  * under the terms of the GNU Lesser General Public License as published by 
  11:  * the Free Software Foundation; either version 2.1 of the License, or 
  12:  * (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but 
  15:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
  16:  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
  17:  * License for more details.
  18:  *
  19:  * You should have received a copy of the GNU Lesser General Public
  20:  * License along with this library; if not, write to the Free Software
  21:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
  22:  * USA.  
  23:  *
  24:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
  25:  * in the United States and other countries.]
  26:  *
  27:  * -------------------------
  28:  * SunPNGEncoderAdapter.java
  29:  * -------------------------
  30:  * (C) Copyright 2004, 2007, by Richard Atkinson and Contributors.
  31:  *
  32:  * Original Author:  Richard Atkinson;
  33:  * Contributor(s):   -;
  34:  *
  35:  * $Id: SunPNGEncoderAdapter.java,v 1.3.2.3 2007/02/02 14:51:22 mungady Exp $
  36:  *
  37:  * Changes
  38:  * -------
  39:  * 01-Aug-2004 : Initial version (RA);
  40:  * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
  41:  *
  42:  */
  43: 
  44: package org.jfree.chart.encoders;
  45: 
  46: import javax.imageio.ImageIO;
  47: import java.awt.image.BufferedImage;
  48: import java.io.OutputStream;
  49: import java.io.ByteArrayOutputStream;
  50: import java.io.IOException;
  51: 
  52: /**
  53:  * Adapter class for the Sun PNG Encoder.  The ImageEncoderFactory will only 
  54:  * return a reference to this class by default if the library has been compiled 
  55:  * under a JDK 1.4+ and is being run using a JDK 1.4+.
  56:  */
  57: public class SunPNGEncoderAdapter implements ImageEncoder {
  58: 
  59:     /**
  60:      * Get the quality of the image encoding (always 0.0).
  61:      *
  62:      * @return A float representing the quality.
  63:      */
  64:     public float getQuality() {
  65:         return 0.0f;
  66:     }
  67: 
  68:     /**
  69:      * Set the quality of the image encoding (not supported in this 
  70:      * ImageEncoder).
  71:      *
  72:      * @param quality  A float representing the quality.
  73:      */
  74:     public void setQuality(float quality) {
  75:         //  No op
  76:     }
  77: 
  78:     /**
  79:      * Get whether the encoder should encode alpha transparency (always false).
  80:      *
  81:      * @return Whether the encoder is encoding alpha transparency.
  82:      */
  83:     public boolean isEncodingAlpha() {
  84:         return false;
  85:     }
  86: 
  87:     /**
  88:      * Set whether the encoder should encode alpha transparency (not 
  89:      * supported in this ImageEncoder).
  90:      *
  91:      * @param encodingAlpha  Whether the encoder should encode alpha 
  92:      *                       transparency.
  93:      */
  94:     public void setEncodingAlpha(boolean encodingAlpha) {
  95:         //  No op
  96:     }
  97: 
  98:     /**
  99:      * Encodes an image in PNG format.
 100:      *
 101:      * @param bufferedImage  The image to be encoded.
 102:      * 
 103:      * @return The byte[] that is the encoded image.
 104:      * 
 105:      * @throws IOException
 106:      */
 107:     public byte[] encode(BufferedImage bufferedImage) throws IOException {
 108:         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
 109:         encode(bufferedImage, outputStream);
 110:         return outputStream.toByteArray();
 111:     }
 112: 
 113:     /**
 114:      * Encodes an image in PNG format and writes it to an OutputStream.
 115:      *
 116:      * @param bufferedImage  The image to be encoded.
 117:      * @param outputStream  The OutputStream to write the encoded image to.
 118:      * @throws IOException
 119:      */
 120:     public void encode(BufferedImage bufferedImage, OutputStream outputStream) 
 121:         throws IOException {
 122:         if (bufferedImage == null) {
 123:             throw new IllegalArgumentException("Null 'image' argument.");
 124:         }
 125:         if (outputStream == null) {
 126:             throw new IllegalArgumentException("Null 'outputStream' argument.");
 127:         }
 128:         ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
 129:     }
 130: 
 131: }