Package com.levigo.jadice.server.documentplatform

Class PageToImageWorker

java.lang.Object

com.levigo.jadice.server.core.NodeWorker<T>

com.levigo.jadice.server.core.StreamWorker<PageToImageNode>

com.levigo.jadice.server.documentplatform.PageToImageWorker

All Implemented Interfaces:

QualifiedLogEventReceiver, WorkerController<PageToImageNode>, Runnable

public class PageToImageWorker
extends StreamWorker<PageToImageNode>

This worker converts the pages of a document into images of a defined target format.

Constructor Summary

Constructors

Constructor	Description
PageToImageWorker()

Method Summary

Modifier and Type	Method	Description
protected static int	calcPNGCompressionLevel(float compressionQuality)	This method calculates the appropriate compression level for a given compression quality.
protected static BufferedImage	convertPageToBufferedImage(com.levigo.jadice.document.Page page, Dimension maximumSize)	Converts the document page to a buffered image.
protected static void	convertPageToTargetFormat(com.levigo.jadice.document.Page page, PageToImageNode.Format targetFormatName, Dimension maximumSize, int colorModel, float compressionQuality, OutputStream out)	Converts the current page to an input stream of the target format.
protected static com.levigo.jadice.document.Document	readDocument(Stream stream)	Read the stream into the document data structure.
protected void	work(Stream stream)	Converts the pages of a document into images in the target format.

Methods inherited from class com.levigo.jadice.server.core.StreamWorker

accept, reject, work

Methods inherited from class com.levigo.jadice.server.core.NodeWorker

abort, abortNow, addInputBundle, addOutputBundle, doAbort, doAbortNow, error, error, error, fail, fail, fail, getController, getInputBundle, getInputBundles, getJob, getLimitSupport, getNode, getOutputBundle, getOutputBundles, getServerJob, getState, getStreamTransportFactory, getTransportSender, initialize, isAbortRequested, postWork, preWork, run, setDescriptor, setJob, toString, warn, warn, warn

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PageToImageWorker

public PageToImageWorker()

Method Detail

work

protected void work(Stream stream)
             throws Throwable

Converts the pages of a document into images in the target format.

Specified by:

work in class StreamWorker<PageToImageNode>

Parameters:

stream - the input stream.

Throws:

Throwable - if an uncaught exception occurs.

convertPageToBufferedImage

protected static BufferedImage convertPageToBufferedImage(com.levigo.jadice.document.Page page,
                                                          Dimension maximumSize)

Converts the document page to a buffered image.

Parameters:

page - the given document page.

Returns:

the corresponding buffered image.

convertPageToTargetFormat

protected static void convertPageToTargetFormat(com.levigo.jadice.document.Page page,
                                                PageToImageNode.Format targetFormatName,
                                                Dimension maximumSize,
                                                int colorModel,
                                                float compressionQuality,
                                                OutputStream out)
                                         throws IOException

Converts the current page to an input stream of the target format.

Parameters:

page - the document's page.

targetFormatName - the desired target format.

maximumSize - the maximum bounds of the image result.

colorModel - a specified color model.

compressionQuality - the desired compression quality 1.0f (no compression) - 0.0 (full compression)

out - the OutputStream to which the image is written.

Throws:

IOException - if an I/O error occurs.

calcPNGCompressionLevel

protected static int calcPNGCompressionLevel(float compressionQuality)

This method calculates the appropriate compression level for a given compression quality.

Parameters:

compressionQuality - the desired compression quality.

Returns:

the calculated compression level.

readDocument

protected static com.levigo.jadice.document.Document readDocument(Stream stream)
                                                           throws com.levigo.jadice.document.JadiceException,
                                                                  IOException

Read the stream into the document data structure.

Parameters:

stream - the document's stream.

Returns:

the corresponding document.

Throws:

com.levigo.jadice.document.JadiceException - if the document couldn't be read.

IOException - if an I/O error occurs.