Java Doc for ImageDecoderImpl.java in  » Graphic-Library » xmlgraphics-commons-1.2 » org » apache » xmlgraphics » image » codec » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Graphic Library » xmlgraphics commons 1.2 » org.apache.xmlgraphics.image.codec.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.xmlgraphics.image.codec.util.ImageDecoderImpl

All known Subclasses:   org.apache.xmlgraphics.image.codec.png.PNGImageDecoder,  org.apache.xmlgraphics.image.codec.tiff.TIFFImageDecoder,
ImageDecoderImpl
abstract public class ImageDecoderImpl implements ImageDecoder(Code)
A partial implementation of the ImageDecoder interface useful for subclassing.


Field Summary
protected  SeekableStreaminput
     The SeekableStream associcted with this ImageEncoder.
protected  ImageDecodeParamparam
     The ImageDecodeParam object associated with this ImageEncoder.

Constructor Summary
public  ImageDecoderImpl(SeekableStream input, ImageDecodeParam param)
     Constructs an ImageDecoderImpl with a given SeekableStream and ImageDecodeParam instance.
public  ImageDecoderImpl(InputStream input, ImageDecodeParam param)
     Constructs an ImageDecoderImpl with a given InputStream and ImageDecodeParam instance.

Method Summary
public  RasterdecodeAsRaster()
     Returns a Raster that contains the decoded contents of the SeekableStream associated with this ImageDecoder.
public  RasterdecodeAsRaster(int page)
     Returns a Raster that contains the decoded contents of the SeekableStream associated with this ImageDecoder. The given page of a multi-page image is decoded.
public  RenderedImagedecodeAsRenderedImage()
     Returns a RenderedImage that contains the decoded contents of the SeekableStream associated with this ImageDecoder.
abstract public  RenderedImagedecodeAsRenderedImage(int page)
     Returns a RenderedImage that contains the decoded contents of the SeekableStream associated with this ImageDecoder. The given page of a multi-page image is decoded.
public  SeekableStreamgetInputStream()
     Returns the SeekableStream associated with this ImageDecoder.
public  intgetNumPages()
     Returns the number of pages present in the current stream. By default, the return value is 1.
public  ImageDecodeParamgetParam()
     Returns the current parameters as an instance of the ImageDecodeParam interface.
public  voidsetParam(ImageDecodeParam param)
     Sets the current parameters to an instance of the ImageDecodeParam interface.

Field Detail
input
protected SeekableStream input(Code)
The SeekableStream associcted with this ImageEncoder.



param
protected ImageDecodeParam param(Code)
The ImageDecodeParam object associated with this ImageEncoder.




Constructor Detail
ImageDecoderImpl
public ImageDecoderImpl(SeekableStream input, ImageDecodeParam param)(Code)
Constructs an ImageDecoderImpl with a given SeekableStream and ImageDecodeParam instance.



ImageDecoderImpl
public ImageDecoderImpl(InputStream input, ImageDecodeParam param)(Code)
Constructs an ImageDecoderImpl with a given InputStream and ImageDecodeParam instance. The input parameter will be used to construct a ForwardSeekableStream; if the ability to seek backwards is required, the caller should construct an instance of SeekableStream and make use of the other contructor.




Method Detail
decodeAsRaster
public Raster decodeAsRaster() throws IOException(Code)
Returns a Raster that contains the decoded contents of the SeekableStream associated with this ImageDecoder. Only the first page of a multi-page image is decoded.



decodeAsRaster
public Raster decodeAsRaster(int page) throws IOException(Code)
Returns a Raster that contains the decoded contents of the SeekableStream associated with this ImageDecoder. The given page of a multi-page image is decoded. If the page does not exist, an IOException will be thrown. Page numbering begins at zero.
Parameters:
  page - The page to be decoded.



decodeAsRenderedImage
public RenderedImage decodeAsRenderedImage() throws IOException(Code)
Returns a RenderedImage that contains the decoded contents of the SeekableStream associated with this ImageDecoder. Only the first page of a multi-page image is decoded.



decodeAsRenderedImage
abstract public RenderedImage decodeAsRenderedImage(int page) throws IOException(Code)
Returns a RenderedImage that contains the decoded contents of the SeekableStream associated with this ImageDecoder. The given page of a multi-page image is decoded. If the page does not exist, an IOException will be thrown. Page numbering begins at zero.
Parameters:
  page - The page to be decoded.



getInputStream
public SeekableStream getInputStream()(Code)
Returns the SeekableStream associated with this ImageDecoder.



getNumPages
public int getNumPages() throws IOException(Code)
Returns the number of pages present in the current stream. By default, the return value is 1. Subclasses that deal with multi-page formats should override this method.



getParam
public ImageDecodeParam getParam()(Code)
Returns the current parameters as an instance of the ImageDecodeParam interface. Concrete implementations of this interface will return corresponding concrete implementations of the ImageDecodeParam interface. For example, a JPEGImageDecoder will return an instance of JPEGDecodeParam.



setParam
public void setParam(ImageDecodeParam param)(Code)
Sets the current parameters to an instance of the ImageDecodeParam interface. Concrete implementations of ImageDecoder may throw a RuntimeException if the param argument is not an instance of the appropriate subclass or subinterface. For example, a JPEGImageDecoder will expect param to be an instance of JPEGDecodeParam.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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