Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/awt/image/ImageDecoder.java

@@ -0,0 +1,156 @@
+/* ImageDecoder.java --
+   Copyright (C) 1999, 2000, 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.awt.image;
+
+import java.awt.image.ImageConsumer;
+import java.awt.image.ImageProducer;
+import java.io.ByteArrayInputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Vector;
+
+public abstract class ImageDecoder implements ImageProducer 
+{
+  Vector consumers = new Vector ();
+  String filename;
+  URL url;
+  byte[] data;
+  int offset;
+  int length;
+  InputStream input;
+
+  static
+  {
+    // FIXME: there was some broken code here that looked like
+    // it wanted to rely on this property.  I don't have any idea
+    // what it was intended to do.
+    // String endian = System.getProperties ().getProperty ("gnu.cpu.endian");
+  }
+
+  public ImageDecoder (String filename)
+  {
+    this.filename = filename;
+  }
+
+  public ImageDecoder (URL url)
+  {
+    this.url = url;
+  }
+
+  public ImageDecoder (InputStream is)
+  {
+    this.input = is;
+  }
+
+  public ImageDecoder (byte[] imagedata, int imageoffset, int imagelength)
+  {
+    data = imagedata;
+    offset = imageoffset;
+    length = imagelength;
+  }
+
+  public void addConsumer (ImageConsumer ic) 
+  {
+    consumers.addElement (ic);
+  }
+
+  public boolean isConsumer (ImageConsumer ic)
+  {
+    return consumers.contains (ic);
+  }
+  
+  public void removeConsumer (ImageConsumer ic)
+  {
+    consumers.removeElement (ic);
+  }
+
+  public void startProduction (ImageConsumer ic)
+  {
+    if (!isConsumer(ic))
+      addConsumer(ic);
+
+    Vector list = (Vector) consumers.clone ();
+    try 
+      {
+	// Create the input stream here rather than in the
+	// ImageDecoder constructors so that exceptions cause
+	// imageComplete to be called with an appropriate error
+	// status.
+        if (input == null)
+          {
+            try 
+              {
+                if (url != null)
+                  input = url.openStream();
+                else
+                  {
+                    if (filename != null)
+                      input = new FileInputStream (filename);
+                    else
+                      input = new ByteArrayInputStream (data, offset, length);
+                  }
+                produce (list, input);
+              } 
+            finally 
+              {
+                input = null;
+              }
+          }
+        else
+          {
+            produce (list, input);
+          }
+      }
+    catch (Exception e)
+      {
+	for (int i = 0; i < list.size (); i++)
+	  {
+	    ImageConsumer ic2 = (ImageConsumer) list.elementAt (i);
+	    ic2.imageComplete (ImageConsumer.IMAGEERROR);
+	  }
+      }
+  }
+
+  public void requestTopDownLeftRightResend (ImageConsumer ic) 
+  { 
+  }
+
+  public abstract void produce (Vector v, InputStream is) throws IOException;
+}