Class ImageWriter

protected Locale[] availableLocales

All locales available for localization of warning messages, or null if localization is not supported.

protected Locale locale

The current locale used to localize warning messages, or null if no locale has been set.

protected ImageWriterSpi originatingProvider

The image writer SPI that instantiated this writer.

protected Object output

An ImageInputStream to which image data is written.

protected List progressListeners

A list of installed progress listeners. Initially null, meaning no installed listeners.

protected List warningListeners

A list of installed warning listeners. Initially null, meaning no installed listeners.

protected List warningLocales

A list of warning locales corresponding with the list of installed warning listeners. Initially null, meaning no locales.

protected ImageWriter(ImageWriterSpi originatingProvider)

Construct an image writer.

Parameters:

originatingProvider - the provider that is constructing this image writer, or null

public void abort()

Request that writing be aborted. The unwritten portions of the destination image will be undefined. Writers should clear the abort flag before starting a write operation, then poll it periodically during the write operation.

protected boolean abortRequested()

Check if the abort flag is set.

Returns:

true if the current write operation should be aborted, false otherwise

public void addIIOWriteProgressListener(IIOWriteProgressListener listener)

Install a write progress listener. This method will return immediately if listener is null.

Parameters:

listener - a write progress listener or null

public void addIIOWriteWarningListener(IIOWriteWarningListener listener)

Install a write warning listener. This method will return immediately if listener is null. Warning messages sent to this listener will be localized using the current locale. If the current locale is null then this writer will select a sensible default.

Parameters:

listener - a write warning listener

public boolean canInsertEmpty(int imageIndex)
            throws IOException

Check whether a new empty image can be inserted at the given frame index. Pixel values may be filled in later using the replacePixels methods. Indices greater than the insertion index will be incremented. If imageIndex is -1, the image will be appended at the end of the current image list.

Parameters:

imageIndex - the frame index

Returns:

true if an empty image can be inserted at imageIndex, false otherwise

Throws:

IllegalStateException - if output is null

IndexOutOfBoundsException - if imageIndex is less than -1 or greater than the last index in the current image list

IOException - if a write error occurs

public boolean canInsertImage(int imageIndex)
            throws IOException

Check whether an image can be inserted at the given frame index. Indices greater than the insertion index will be incremented. If imageIndex is -1, the image will be appended at the end of the current image list.

Parameters:

imageIndex - the frame index

Returns:

true if an image can be inserted at imageIndex, false otherwise

Throws:

IllegalStateException - if output is null

IndexOutOfBoundsException - if imageIndex is less than -1 or greater than the last index in the current image list

IOException - if a write error occurs

public boolean canRemoveImage(int imageIndex)
            throws IOException

Check whether an image can be removed from the given frame index. Indices greater than the removal index will be decremented.

Parameters:

imageIndex - the frame index

Returns:

true if an image can be removed from imageIndex, false otherwise

Throws:

IllegalStateException - if output is null

IndexOutOfBoundsException - if imageIndex is less than 0 or greater than the last index in the current image list

IOException - if a write error occurs

public boolean canReplaceImageMetadata(int imageIndex)
            throws IOException

Check whether the metadata associated the image at the given frame index can be replaced.

Parameters:

imageIndex - the frame index

Returns:

true if the metadata associated with the image at imageIndex can be replaced, false otherwise

Throws:

IllegalStateException - if output is null

IndexOutOfBoundsException - if imageIndex is less than 0 or greater than the last index in the current image list

IOException - if a write error occurs

public boolean canReplacePixels(int imageIndex)
            throws IOException

Check whether the pixels within the image at the given index can be replaced.

Parameters:

imageIndex - the frame index

Returns:

true if the pixels in the image at imageIndex can be replaced, false otherwise

Throws:

IllegalStateException - if output is null

IndexOutOfBoundsException - if imageIndex is less than 0 or greater than the last index in the current image list

IOException - if a write error occurs

public boolean canReplaceStreamMetadata()
            throws IOException

Check whether the metadata associated the entire image stream can be replaced.

Returns:

true if the stream metadata can be replaced, false otherwise

Throws:

IllegalStateException - if output is null

IOException - if a write error occurs

public boolean canWriteEmpty()
            throws IOException

Check whether an entire empty image, including empty metadata and empty thumbnails, can be written to the output stream, leaving pixel values to be filled in later using the replacePixels methods.

Returns:

true if an entire empty image can be written before its contents are filled in, false otherwise

Throws:

IllegalStateException - if output is null

IOException - if a write error occurs

public boolean canWriteRasters()

Check if IIOImages containing raster data are supported.

Returns:

true if raster IIOImages are supported, false otherwise

public boolean canWriteSequence()

Check if an image can be appended at the end of the current list of images even if prior images have already been written.

Returns:

true if sequences of images can be written, false otherwise

protected void clearAbortRequest()

Clear the abort flag.

public abstract IIOMetadata convertImageMetadata(IIOMetadata inData,
                                                 ImageTypeSpecifier imageType,
                                                 ImageWriteParam param)

Convert IIOMetadata from an input reader format, returning an IIOMetadata suitable for use by an image writer. The ImageTypeSpecifier specifies the destination image type. An optional ImageWriteParam argument is available in case the image writing parameters affect the metadata conversion.

Specified by:

convertImageMetadata in interface ImageTranscoder

Parameters:

inData - the metadata coming from an image reader

imageType - the output image type of the writer

param - the image writing parameters or null

Returns:

the converted metadata that should be used by the image writer, or null if this ImageTranscoder has no knowledge of the input metadata

Throws:

IllegalArgumentException - if either inData or imageType is null

public abstract IIOMetadata convertStreamMetadata(IIOMetadata inData,
                                                  ImageWriteParam param)

Convert IIOMetadata from an input stream format, returning an IIOMetadata suitable for use by an image writer. An optional ImageWriteParam argument is available in case the image writing parameters affect the metadata conversion.

Specified by:

convertStreamMetadata in interface ImageTranscoder

Parameters:

inData - the metadata coming from an input image stream

param - the image writing parameters or null

Returns:

the converted metadata that should be used by the image writer, or null if this ImageTranscoder has no knowledge of the input metadata

Throws:

IllegalArgumentException - if inData is null

public void dispose()

Releases any resources allocated to this object. Subsequent calls to methods on this object will produce undefined results. The default implementation does nothing; subclasses should use this method ensure that native resources are released.

public void endInsertEmpty()
            throws IOException

Complete inserting an empty image in the output stream.

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if inserting empty images is not supported

IllegalArgumentException - if a call to prepareInsertEmpty was not called previous to this method being called (a sequence of prepareInsertEmpty calls must be terminated by a call to endInsertEmpty)

IllegalArgumentException - if prepareWriteEmpty was called before this method being called (without a terminating call to endWriteEmpty)

IllegalArgumentException - if prepareReplacePixels was called before this method being called (without a terminating call to endReplacePixels)

IOException - if a write error occurs

public void endReplacePixels()
            throws IOException

Complete replacing pixels in an image in the output stream.

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if replacing pixels is not supported by this writer

IllegalArgumentException - if prepareReplacePixels was not called before this method being called

IOException - if a write error occurs

public void endWriteEmpty()
            throws IOException

Complete writing an empty image to the image output stream.

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if writing empty images is not supported

IllegalArgumentException - if a call to prepareWriteEmpty was not called previous to this method being called (a sequence of prepareWriteEmpty calls must be terminated by a call to endWriteEmpty)

IllegalArgumentException - if prepareInsertEmpty was called before this method being called (without a terminating call to endInsertEmpty)

IllegalArgumentException - if prepareReplacePixels was called before this method being called (without a terminating call to endReplacePixels)

IOException - if a write error occurs

public void endWriteSequence()
            throws IOException

Complete writing a sequence of images to the output stream. This method may patch header data and write out footer data.

Throws:

IllegalStateException - if output is null

IllegalStateException - if prepareWriteSequence has not been called

UnsupportedOperationException - if writing a sequence of images is not supported

IOException - if a write error occurs

public Locale[] getAvailableLocales()

Retrieve the available locales. Return null if no locales are available or a clone of availableLocales.

Returns:

an array of locales or null

public abstract IIOMetadata getDefaultImageMetadata(ImageTypeSpecifier imageType,
                                                    ImageWriteParam param)

Get a metadata object appropriate for encoding an image specified by the given image type specifier and optional image write parameters.

Parameters:

imageType - an image type specifier

param - image writing parameters, or null

Returns:

a metadata object appropriate for encoding an image of the given type with the given parameters

public abstract IIOMetadata getDefaultStreamMetadata(ImageWriteParam param)

Get a metadata object appropriate for encoding the default image type handled by this writer, optionally considering image write parameters.

Parameters:

param - image writing parameters, or null

Returns:

a metadata object appropriate for encoding an image of the default type with the given parameters

public ImageWriteParam getDefaultWriteParam()

Retrieve the default write parameters for this writer's image format. The default implementation returns new ImageWriteParam().

Returns:

image writing parameters

public Locale getLocale()

Get this writer's locale. null is returned if the locale has not been set.

Returns:

this writer's locale, or null

public int getNumThumbnailsSupported(ImageTypeSpecifier imageType,
                                     ImageWriteParam param,
                                     IIOMetadata streamMetadata,
                                     IIOMetadata imageMetadata)

Get the number of thumbnails supported by this image writer, based on the given image type, image writing parameters, and stream and image metadata. The image writing parameters are optional, in case they affect the number of thumbnails supported.

Parameters:

imageType - an image type specifier, or null

param - image writing parameters, or null

streamMetadata - the metadata associated with this stream, or null

imageMetadata - the metadata associated with this image, or null

Returns:

the number of thumbnails that this writer supports writing or -1 if the given information is insufficient

public ImageWriterSpi getOriginatingProvider()

Get the ImageWriterSpi that created this writer or null.

Returns:

an ImageWriterSpi, or null

public Object getOutput()

Get this reader's image output destination. null is returned if the image destination has not been set.

Returns:

an image output destination object, or null

public Dimension[] getPreferredThumbnailSizes(ImageTypeSpecifier imageType,
                                              ImageWriteParam param,
                                              IIOMetadata streamMetadata,
                                              IIOMetadata imageMetadata)

Get the preferred sizes for thumbnails based on the given image type, image writing parameters, and stream and image metadata. The preferred sizes are returned in pairs of dimension values; the first value in the array is a dimension object representing the minimum thumbnail size, the second value is a dimension object representing a maximum thumbnail size. The writer can select a size within the range given by each pair, or it can ignore these size hints.

Parameters:

imageType - an image type specifier, or null

param - image writing parameters, or null

streamMetadata - the metadata associated with this stream, or null

imageMetadata - the metadata associated with this image, or null

Returns:

an array of dimension pairs whose length is a multiple of 2, or null if there is no preferred size (any size is allowed) or if the size is unknown (insufficient information was provided)

public void prepareInsertEmpty(int imageIndex,
                               ImageTypeSpecifier imageType,
                               int width,
                               int height,
                               IIOMetadata imageMetadata,
                               BufferedImage> thumbnails,
                               ImageWriteParam param)
            throws IOException

Start inserting an empty image in the image output stream. All indices after the specified index are incremented. An index of -1 implies that the empty image should be appended to the end of the current image list. The insertion that this method call starts is not complete until endInsertEmpty is called. prepareInsertEmpty cannot be called again until endInsertEmpty is called and calls to prepareWriteEmpty and prepareInsertEmpty may not be intersperced.

Parameters:

imageIndex - the image index

imageType - the image type specifier

width - the image width

height - the image height

imageMetadata - the image metadata, or null

thumbnails - a list of thumbnails, or null

param - image write parameters, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if inserting empty images is not supported

IndexOutOfBoundsException - if imageIndex is less than -1 or greater than the last index in the current image list

IllegalStateException - if a previous call to prepareInsertEmpty was made (without a terminating call to endInsertEmpty)

IllegalStateException - if a previous call to prepareWriteEmpty was made (without a terminating call to endWriteEmpty)

IllegalArgumentException - if imageType is null or thumbnails contain non-BufferedImage objects

IllegalArgumentException - if either width or height is less than 1

IOException - if a write error occurs

public void prepareReplacePixels(int imageIndex,
                                 Rectangle region)
            throws IOException

Start the replacement of pixels within an image in the output stream. Output pixels will be clipped to lie within region.

Parameters:

imageIndex - the index of the image in which pixels are being replaced

region - the rectangle to which to limit pixel replacement

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if replacing pixels is not supported

IndexOutOfBoundsException - if imageIndex is less than 0 or greater than the last index in the current image list

IllegalStateException - if a previous call to prepareReplacePixels was made (without a terminating call to endReplacePixels)

IllegalArgumentException - if either region.width or region.height is less than 1, or if region is null

IOException - if a write error occurs

public void prepareWriteEmpty(IIOMetadata streamMetadata,
                              ImageTypeSpecifier imageType,
                              int width,
                              int height,
                              IIOMetadata imageMetadata,
                              BufferedImage> thumbnails,
                              ImageWriteParam param)
            throws IOException

Start writing an empty image to the end of the image output stream. The writing that this method call starts is not complete until endWriteEmpty is called. prepareWritetEmpty cannot be called again until endWriteEmpty is called and calls to prepareWriteEmpty and prepareInsertEmpty may not be intersperced.

Parameters:

streamMetadata - metadata associated with the stream, or null

imageType - the image type specifier

width - the image width

height - the image height

imageMetadata - the image metadata, or null

thumbnails - a list of thumbnails, or null

param - image write parameters, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if writing empty images is not supported

IndexOutOfBoundsException - if imageIndex is less than -1 or greater than the last index in the current image list

IllegalStateException - if a previous call to prepareInsertEmpty was made (without a terminating call to endInsertEmpty)

IllegalStateException - if a previous call to prepareWriteEmpty was made (without a terminating call to endWriteEmpty)

IllegalArgumentException - if imageType is null or thumbnails contain non-BufferedImage objects

IllegalArgumentException - if either width or height is less than 1

IOException - if a write error occurs

public void prepareWriteSequence(IIOMetadata streamMetadata)
            throws IOException

Start the writing of a sequence of images.

Parameters:

streamMetadata - the stream metadata, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if writing sequences of images is not supported

IOException - if a write error occurs

protected void processImageComplete()

Notifies all installed write progress listeners that image loading has completed by calling their imageComplete methods.

protected void processImageProgress(float percentageDone)

Notifies all installed write progress listeners that a certain percentage of the image has been loaded, by calling their imageProgress methods.

Parameters:

percentageDone - the percentage of image data that has been loaded

protected void processImageStarted(int imageIndex)

Notifies all installed write progress listeners, by calling their imageStarted methods, that image loading has started on the given image.

Parameters:

imageIndex - the frame index of the image that has started loading

protected void processThumbnailComplete()

Notifies all installed write progress listeners, by calling their thumbnailComplete methods, that a thumbnail has completed loading.

protected void processThumbnailProgress(float percentageDone)

Notifies all installed write progress listeners that a certain percentage of a thumbnail has been loaded, by calling their thumbnailProgress methods.

Parameters:

percentageDone - the percentage of thumbnail data that has been loaded

protected void processThumbnailStarted(int imageIndex,
                                       int thumbnailIndex)

Notifies all installed write progress listeners, by calling their imageStarted methods, that thumbnail loading has started on the given thumbnail of the given image.

Parameters:

imageIndex - the frame index of the image one of who's thumbnails has started loading

thumbnailIndex - the index of the thumbnail that has started loading

protected void processWarningOccurred(int imageIndex,
                                      String warning)

Notifies all installed warning listeners, by calling their warningOccurred methods, that a warning message has been raised.

Parameters:

imageIndex - the index of the image that was being written when the warning was raised

warning - the warning message

Throws:

IllegalArgumentException - if warning is null

protected void processWarningOccurred(int imageIndex,
                                      String baseName,
                                      String keyword)

Notify all installed warning listeners, by calling their warningOccurred methods, that a warning message has been raised. The warning message is retrieved from a resource bundle, using the given basename and keyword.

Parameters:

imageIndex - the index of the image that was being written when the warning was raised

baseName - the basename of the resource from which to retrieve the warning message

keyword - the keyword used to retrieve the warning from the resource bundle

Throws:

IllegalArgumentException - if either baseName or keyword is null

IllegalArgumentException - if no resource bundle is found using baseName

IllegalArgumentException - if the given keyword produces no results from the resource bundle

IllegalArgumentException - if the retrieved object is not a String

protected void processWriteAborted()

Notifies all installed write progress listeners that image loading has been aborted by calling their writeAborted methods.

public void removeAllIIOWriteProgressListeners()

Uninstall all write progress listeners.

public void removeAllIIOWriteWarningListeners()

Uninstall all write warning listeners.

public void removeIIOWriteProgressListener(IIOWriteProgressListener listener)

Uninstall the given write progress listener.

Parameters:

listener - the listener to remove

public void removeIIOWriteWarningListener(IIOWriteWarningListener listener)

Uninstall the given write warning listener.

Parameters:

listener - the listener to remove

public void removeImage(int imageIndex)
            throws IOException

Remove the image at the specified index from the output stream.

Parameters:

imageIndex - the frame index from which to remove the image

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if removing this image is not supported

IndexOutOfBoundsException - if imageIndex is less than 0 or greater than the last index in the current image list

IOException - if a write error occurs

public void replaceImageMetadata(int imageIndex,
                                 IIOMetadata imageMetadata)
            throws IOException

Replace the metadata associated with the image at the given index.

Parameters:

imageIndex - the index of the image whose metadata should be replaced

imageMetadata - the metadata, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if replacing this image's metadata is not supported

IndexOutOfBoundsException - if imageIndex is less than 0 or greater than the last index in the current image list

IOException - if a write error occurs

public void replacePixels(Raster raster,
                          ImageWriteParam param)
            throws IOException

Replace a region of an image in the output stream with a portion of the given raster data. The image data must be of the same type as that in the output stream. The destination region is given by the image writing parameters and the source region is the one given to prepareReplacePixels.

Parameters:

raster - the raster data with which to overwrite the image region in the stream

param - the image writing parameters

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if replacing pixels is not supported

IllegalStateException - if prepareReplacePixels was not called before this method was called

UnsupportedOperationException - if raster data is not supported

IllegalArgumentException - if raster is null or if param is null or if the overlap of the source and destination regions contains no pixels or if the image types differ and no conversion is possible

IOException - if a write error occurs

public void replacePixels(RenderedImage image,
                          ImageWriteParam param)
            throws IOException

Replace a region of an image in the output stream with a portion of the given rendered image. The image data must be of the same type as that in the output stream. The destination region is given by the image writing parameters and the source region is the one given to prepareReplacePixels.

Parameters:

image - the rendered image with which to overwrite the image region in the stream

param - the image writing parameters

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if replacing pixels is not supported

IllegalStateException - if prepareReplacePixels was not called before this method was called

IllegalArgumentException - if image is null or if param is null or if the overlap of the source and destination regions contains no pixels or if the image types differ and no conversion is possible

IOException - if a write error occurs

public void replaceStreamMetadata(IIOMetadata streamMetadata)
            throws IOException

Replace the metadata associated with this image stream.

Parameters:

streamMetadata - the stream metadata, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if replacing the stream metadata is not supported

IOException - if a write error occurs

public void reset()

Reset this writer's internal state.

public void setLocale(Locale locale)

Set the current locale or use the default locale.

Parameters:

locale - the locale to set, or null

public void setOutput(Object output)

Set the output destination of the given object. The output destination must be set before many methods can be called on this writer. (see all ImageWriter methods that throw IllegalStateException). If input is null then the current input source will be removed.

Parameters:

Throws:

IllegalArgumentException - if input is not a valid input source for this writer and is not an ImageInputStream

public void write(RenderedImage image)
            throws IOException

Write a rendered image to the output stream.

Parameters:

image - a rendered image containing image data to be written

Throws:

IllegalStateException - if output is null

IllegalArgumentException - if image is null

IOException - if a write error occurs

public void write(IIOImage image)
            throws IOException

Write a image data, metadata and thumbnails to the output stream.

Parameters:

image - image data, metadata and thumbnails to be written

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if image contains raster data but this writer does not support rasters

IllegalArgumentException - if image is null

IOException - if a write error occurs

public abstract void write(IIOMetadata streamMetadata,
                           IIOImage image,
                           ImageWriteParam param)
            throws IOException

Write an image stream, including thumbnails and metadata to the output stream. The output must have been set prior to this method being called. Metadata associated with the stream may be supplied, or it can be left null. IIOImage may contain raster data if this writer supports rasters, or it will contain a rendered image. Thumbnails are resized if need be. Image writing parameters may be specified to affect writing, or may be left null.

Parameters:

streamMetadata - metadata associated with this stream, or null

image - an IIOImage containing image data, metadata and thumbnails to be written

param - image writing parameters, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if image contains raster data but this writer does not support rasters

IllegalArgumentException - if image is null

IOException - if a write error occurs

public void writeInsert(int imageIndex,
                        IIOImage image,
                        ImageWriteParam param)
            throws IOException

Insert an image into the output stream. Indices greater than the specified index are incremented accordingly. Specifying an index of -1 causes the image to be appended at the end of the current image list.

Parameters:

imageIndex - the frame index at which to insert the image

image - the image data, metadata and thumbnails to be inserted

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if image insertion is not supported

IllegalArgumentException - if image is null

IndexOutOfBoundsException - if imageIndex is less than -1 or greater than the last index in the current image list

UnsupportedOperationException - if image contains raster data but this writer does not support rasters

IOException - if a write error occurs

public void writeToSequence(IIOImage image,
                            ImageWriteParam param)
            throws IOException

Write a sequence of images, including thumbnails and metadata, to the output stream. The output must have been set prior to this method being called. Metadata associated with the stream may be supplied, or it can be left null. IIOImage may contain raster data if this writer supports rasters, or it will contain a rendered image. Thumbnails are resized if need be. Image writing parameters may be specified to affect writing, or may be left null.

Parameters:

image - an IIOImage containing image data, metadata and thumbnails to be written

param - image writing parameters, or null

Throws:

IllegalStateException - if output is null

UnsupportedOperationException - if writing sequences of images is not supported

IllegalArgumentException - if image is null

UnsupportedOperationException - if image contains raster data but this writer does not support rasters

IOException - if a write error occurs