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:  * Changes
  36:  * -------
  37:  * 01-Aug-2004 : Initial version (RA);
  38:  * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
  39:  *
  40:  */
  41: 
  42: package org.jfree.chart.encoders;
  43: 
  44: import java.awt.image.BufferedImage;
  45: import java.io.ByteArrayOutputStream;
  46: import java.io.IOException;
  47: import java.io.OutputStream;
  48: 
  49: import javax.imageio.ImageIO;
  50: 
  51: /**
  52:  * Adapter class for the Sun PNG Encoder.  The ImageEncoderFactory will only 
  53:  * return a reference to this class by default if the library has been compiled 
  54:  * under a JDK 1.4+ and is being run using a JDK 1.4+.
  55:  */
  56: public class SunPNGEncoderAdapter implements ImageEncoder {
  57: 
  58:     /**
  59:      * Get the quality of the image encoding (always 0.0).
  60:      *
  61:      * @return A float representing the quality.
  62:      */
  63:     public float getQuality() {
  64:         return 0.0f;
  65:     }
  66: 
  67:     /**
  68:      * Set the quality of the image encoding (not supported in this 
  69:      * ImageEncoder).
  70:      *
  71:      * @param quality  A float representing the quality.
  72:      */
  73:     public void setQuality(float quality) {
  74:         //  No op
  75:     }
  76: 
  77:     /**
  78:      * Get whether the encoder should encode alpha transparency (always false).
  79:      *
  80:      * @return Whether the encoder is encoding alpha transparency.
  81:      */
  82:     public boolean isEncodingAlpha() {
  83:         return false;
  84:     }
  85: 
  86:     /**
  87:      * Set whether the encoder should encode alpha transparency (not 
  88:      * supported in this ImageEncoder).
  89:      *
  90:      * @param encodingAlpha  Whether the encoder should encode alpha 
  91:      *                       transparency.
  92:      */
  93:     public void setEncodingAlpha(boolean encodingAlpha) {
  94:         //  No op
  95:     }
  96: 
  97:     /**
  98:      * Encodes an image in PNG format.
  99:      *
 100:      * @param bufferedImage  The image to be encoded.
 101:      * 
 102:      * @return The byte[] that is the encoded image.
 103:      * 
 104:      * @throws IOException
 105:      */
 106:     public byte[] encode(BufferedImage bufferedImage) throws IOException {
 107:         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
 108:         encode(bufferedImage, outputStream);
 109:         return outputStream.toByteArray();
 110:     }
 111: 
 112:     /**
 113:      * Encodes an image in PNG format and writes it to an OutputStream.
 114:      *
 115:      * @param bufferedImage  The image to be encoded.
 116:      * @param outputStream  The OutputStream to write the encoded image to.
 117:      * @throws IOException
 118:      */
 119:     public void encode(BufferedImage bufferedImage, OutputStream outputStream) 
 120:         throws IOException {
 121:         if (bufferedImage == null) {
 122:             throw new IllegalArgumentException("Null 'image' argument.");
 123:         }
 124:         if (outputStream == null) {
 125:             throw new IllegalArgumentException("Null 'outputStream' argument.");
 126:         }
 127:         ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream);
 128:     }
 129: 
 130: }