imageio.java

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

  }
  
  private static Iterator getWritersByFilter(Class type,
					     ServiceRegistry.Filter filter,
                                             Object writerExtension)
  {
    try
      {
        Iterator it = getRegistry().getServiceProviders(type, filter, true);
        return new ImageWriterIterator(it, writerExtension);
      }
    catch (IllegalArgumentException e)
      {
        return Collections.EMPTY_SET.iterator();
      }
  }

  public static File getCacheDirectory()
  {
    return cacheDirectory;
  }

  public static Iterator getImageReadersByFormatName(String formatName)
  {
    if (formatName == null)
      throw new IllegalArgumentException("formatName may not be null");

    return getReadersByFilter(ImageReaderSpi.class,
                              new ReaderFormatFilter(formatName),
                              formatName);
  }

  public static Iterator getImageReadersByMIMEType(String MIMEType)
  {
    if (MIMEType == null)
      throw new IllegalArgumentException("MIMEType may not be null");

    return getReadersByFilter(ImageReaderSpi.class,
                              new ReaderMIMETypeFilter(MIMEType),
                              MIMEType);
  }

  public static Iterator getImageReadersBySuffix(String fileSuffix)
  {
    if (fileSuffix == null)
      throw new IllegalArgumentException("formatName may not be null");
    
    return getReadersByFilter(ImageReaderSpi.class,
                              new ReaderSuffixFilter(fileSuffix),
                              fileSuffix);
  }

  public static Iterator getImageWritersByFormatName(String formatName)
  {
    if (formatName == null)
      throw new IllegalArgumentException("formatName may not be null");
    
    return getWritersByFilter(ImageWriterSpi.class,
                              new WriterFormatFilter(formatName),
                              formatName);
  }

  public static Iterator getImageWritersByMIMEType(String MIMEType)
  {
    if (MIMEType == null)
      throw new IllegalArgumentException("MIMEType may not be null");
    
    return getWritersByFilter(ImageWriterSpi.class,
                              new WriterMIMETypeFilter(MIMEType),
                              MIMEType);
  }

  public static Iterator getImageWritersBySuffix(String fileSuffix)
  {
    if (fileSuffix == null)
      throw new IllegalArgumentException("fileSuffix may not be null");
    
    return getWritersByFilter(ImageWriterSpi.class,
                              new WriterSuffixFilter(fileSuffix),
                              fileSuffix);
  }

  public static String[] getReaderFormatNames()
  {
    try
      {
        Iterator it =
	  getRegistry().getServiceProviders(ImageReaderSpi.class, true);
	ArrayList result = new ArrayList();

	while (it.hasNext())
	  {
	    ImageReaderSpi spi = (ImageReaderSpi) it.next();
	    String[] names = spi.getFormatNames();

	    for (int i = names.length - 1; i >= 0; --i)
	      result.add(names[i]);
	  }

	return (String[]) result.toArray(new String[result.size()]);
      }
    catch (IllegalArgumentException e)
      {
        return new String[0];
      }
  }

  public static String[] getReaderMIMETypes()
  {
    try
      {
        Iterator it =
	  getRegistry().getServiceProviders(ImageReaderSpi.class, true);
	ArrayList result = new ArrayList();

	while (it.hasNext())
	  {
	    ImageReaderSpi spi = (ImageReaderSpi) it.next();
	    String[] names = spi.getMIMETypes();

	    for (int i = names.length - 1; i >= 0; --i)
	      result.add(names[i]);
	  }

	return (String[]) result.toArray(new String[result.size()]);
      }
    catch (IllegalArgumentException e)
      {
        return new String[0];
      }
  }

  private static IIORegistry getRegistry()
  {
    return IIORegistry.getDefaultInstance();
  }

  public static boolean getUseCache()
  {
    return useCache;
  }

  public static String[] getWriterFormatNames()
  {
    try
      {
        Iterator it =
	  getRegistry().getServiceProviders(ImageWriterSpi.class, true);
	ArrayList result = new ArrayList();

	while (it.hasNext())
	  {
	    ImageWriterSpi spi = (ImageWriterSpi) it.next();
	    String[] names = spi.getFormatNames();

	    for (int i = names.length - 1; i >= 0; --i)
	      result.add(names[i]);
	  }

	return (String[]) result.toArray(new String[result.size()]);
      }
    catch (IllegalArgumentException e)
      {
        return new String[0];
      }
  }

  public static String[] getWriterMIMETypes()
  {
    try
      {
        Iterator it =
	  getRegistry().getServiceProviders(ImageWriterSpi.class, true);
	ArrayList result = new ArrayList();

	while (it.hasNext())
	  {
	    ImageWriterSpi spi = (ImageWriterSpi) it.next();
	    String[] names = spi.getMIMETypes();

	    for (int i = names.length - 1; i >= 0; --i)
	      result.add(names[i]);
	  }

	return (String[]) result.toArray(new String[result.size()]);
      }
    catch (IllegalArgumentException e)
      {
        return new String[0];
      }
  }
  
  /**
   * Rescans the application classpath for ImageIO service providers
   * and registers them.
   */
  public static void scanForPlugins()
  {
    IIORegistry.getDefaultInstance().registerApplicationClasspathSpis();
  }

  public static void setCacheDirectory(File cacheDirectory)
  {
    if (cacheDirectory != null)
      {
        if (!cacheDirectory.isDirectory())
          throw new IllegalArgumentException("cacheDirectory must be a directory");

        cacheDirectory.canWrite();
      }
    
    ImageIO.cacheDirectory = cacheDirectory;
  }

  public static void setUseCache(boolean useCache)
  {
    ImageIO.useCache = useCache;
  }

  /* 
   * "Standard" simplified entry points.
   */

  public static boolean write(RenderedImage im,
                              String formatName,
                              File output)
    throws IOException
  {
    return write(im, formatName, new FileOutputStream(output));
  }

  public static boolean write(RenderedImage im,
                              String formatName,
                              OutputStream output)
    throws IOException
  {
    return write(im, formatName, new MemoryCacheImageOutputStream(output));
  }
  
  
  public static boolean write(RenderedImage im,
                              String formatName,
                              ImageOutputStream output)
    throws IOException
  {
    Iterator writers = getImageWritersByFormatName(formatName);
    IIOImage img = new IIOImage(im, null, null);
    while (writers.hasNext())
      {
        ImageWriter w = (ImageWriter) writers.next();
        try 
          {
            w.setOutput(output);
          }
        catch (IllegalArgumentException e)
          {
            continue;
          }
        
        w.write(null, img, null);
        output.close();
        return true;
      }
    return false;
  }

  public static BufferedImage read(ImageInputStream stream)
    throws IOException
  {
    Iterator providers = getRegistry().getServiceProviders(ImageReaderSpi.class, true);
    while (providers.hasNext())
      {
        ImageReaderSpi spi = (ImageReaderSpi) providers.next();
        if (spi.canDecodeInput(stream))
          {
            ImageReader reader = spi.createReaderInstance();
            reader.setInput(stream);
            return reader.read(0, null);
          }
      }
    return null;
  }
        
  public static BufferedImage read(URL input)
    throws IOException
  {
    return read(input.openStream());
  }

  public static BufferedImage read(InputStream input)
    throws IOException
  {
    return read(new MemoryCacheImageInputStream(input));
  }

  public static BufferedImage read(File input)
    throws IOException
  {
    return read(new FileInputStream(input));
  }

}