Class PngImageParser
- java.lang.Object
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- org.apache.commons.imaging.common.BinaryFileParser
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- org.apache.commons.imaging.ImageParser
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- org.apache.commons.imaging.formats.png.PngImageParser
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- All Implemented Interfaces:
XmpEmbeddable
public class PngImageParser extends ImageParser implements XmpEmbeddable
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Field Summary
Fields Modifier and Type Field Description private static java.lang.String[]
ACCEPTED_EXTENSIONS
private static java.lang.String
DEFAULT_EXTENSION
private static java.util.logging.Logger
LOGGER
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Constructor Summary
Constructors Constructor Description PngImageParser()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
dumpImageFile(java.io.PrintWriter pw, ByteSource byteSource)
Write the ImageInfo and format-specific information for the image content of the specified byte source to a PrintWriterprivate java.util.List<PngChunk>
filterChunks(java.util.List<PngChunk> chunks, ChunkType type)
protected java.lang.String[]
getAcceptedExtensions()
Get an array of all accepted extensionsprotected ImageFormat[]
getAcceptedTypes()
Get an array of ImageFormat objects describing all accepted typesjava.awt.image.BufferedImage
getBufferedImage(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params)
Gets a buffered image specified by the byte source (for sources that specify multiple images, choice of which image is returned is implementation dependent).static java.lang.String
getChunkTypeName(int chunkType)
java.util.List<java.lang.String>
getChunkTypes(java.io.InputStream is)
java.lang.String
getDefaultExtension()
Get the default extension for the format specified by an implementation of ImageParser.byte[]
getICCProfileBytes(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params)
Get an array of bytes describing the International Color Consortium (ICC) specification for the color space of the image contained in the input byteSource.ImageInfo
getImageInfo(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params)
Get image information from the specified ByteSource.java.awt.Dimension
getImageSize(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params)
Get the size of the image described by the specified ByteSource.ImageMetadata
getMetadata(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params)
Get image metadata from the specified byte source.java.lang.String
getName()
Get a descriptive name for the implementation of an ImageParser.private TransparencyFilter
getTransparencyFilter(PngColorType pngColorType, PngChunk pngChunktRNS)
java.lang.String
getXmpXml(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params)
Get a string containing XML-formatted text conforming to the Extensible Metadata Platform (EXP) standard for representing information about image content.boolean
hasChunkType(ByteSource byteSource, ChunkType chunkType)
private boolean
keepChunk(int chunkType, ChunkType[] chunkTypes)
private java.util.List<PngChunk>
readChunks(java.io.InputStream is, ChunkType[] chunkTypes, boolean returnAfterFirst)
private java.util.List<PngChunk>
readChunks(ByteSource byteSource, ChunkType[] chunkTypes, boolean returnAfterFirst)
void
readSignature(java.io.InputStream is)
void
writeImage(java.awt.image.BufferedImage src, java.io.OutputStream os, java.util.Map<java.lang.String,java.lang.Object> params)
Writes the content of a BufferedImage to the specified output stream.-
Methods inherited from class org.apache.commons.imaging.ImageParser
canAcceptExtension, canAcceptExtension, canAcceptType, dumpImageFile, dumpImageFile, dumpImageFile, getAllBufferedImages, getAllBufferedImages, getAllBufferedImages, getAllImageParsers, getBufferedImage, getBufferedImage, getBufferedImageFactory, getFormatCompliance, getFormatCompliance, getFormatCompliance, getICCProfileBytes, getICCProfileBytes, getICCProfileBytes, getICCProfileBytes, getImageInfo, getImageInfo, getImageInfo, getImageSize, getImageSize, getImageSize, getImageSize, getMetadata, getMetadata, getMetadata, getMetadata, getMetadata, isStrict
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Methods inherited from class org.apache.commons.imaging.common.BinaryFileParser
debugNumber, debugNumber, getByteOrder, setByteOrder
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Field Detail
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LOGGER
private static final java.util.logging.Logger LOGGER
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DEFAULT_EXTENSION
private static final java.lang.String DEFAULT_EXTENSION
- See Also:
- Constant Field Values
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ACCEPTED_EXTENSIONS
private static final java.lang.String[] ACCEPTED_EXTENSIONS
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Method Detail
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getName
public java.lang.String getName()
Description copied from class:ImageParser
Get a descriptive name for the implementation of an ImageParser.- Specified by:
getName
in classImageParser
- Returns:
- a valid, subject-matter-specific string.
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getDefaultExtension
public java.lang.String getDefaultExtension()
Description copied from class:ImageParser
Get the default extension for the format specified by an implementation of ImageParser. Some parsers can support more than one extension (i.e. .JPEG, .JPG; .TIF, .TIFF, etc.).- Specified by:
getDefaultExtension
in classImageParser
- Returns:
- A valid string.
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getAcceptedExtensions
protected java.lang.String[] getAcceptedExtensions()
Description copied from class:ImageParser
Get an array of all accepted extensions- Specified by:
getAcceptedExtensions
in classImageParser
- Returns:
- A valid array of one or more elements.
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getAcceptedTypes
protected ImageFormat[] getAcceptedTypes()
Description copied from class:ImageParser
Get an array of ImageFormat objects describing all accepted types- Specified by:
getAcceptedTypes
in classImageParser
- Returns:
- A valid array of one or more elements.
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getChunkTypeName
public static java.lang.String getChunkTypeName(int chunkType)
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getChunkTypes
public java.util.List<java.lang.String> getChunkTypes(java.io.InputStream is) throws ImageReadException, java.io.IOException
- Parameters:
is
- PNG image input stream- Returns:
- List of String-formatted chunk types, ie. "tRNs".
- Throws:
ImageReadException
- if it fail to read the PNG chunksjava.io.IOException
- if it fails to read the input stream data
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hasChunkType
public boolean hasChunkType(ByteSource byteSource, ChunkType chunkType) throws ImageReadException, java.io.IOException
- Throws:
ImageReadException
java.io.IOException
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keepChunk
private boolean keepChunk(int chunkType, ChunkType[] chunkTypes)
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readChunks
private java.util.List<PngChunk> readChunks(java.io.InputStream is, ChunkType[] chunkTypes, boolean returnAfterFirst) throws ImageReadException, java.io.IOException
- Throws:
ImageReadException
java.io.IOException
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readSignature
public void readSignature(java.io.InputStream is) throws ImageReadException, java.io.IOException
- Throws:
ImageReadException
java.io.IOException
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readChunks
private java.util.List<PngChunk> readChunks(ByteSource byteSource, ChunkType[] chunkTypes, boolean returnAfterFirst) throws ImageReadException, java.io.IOException
- Throws:
ImageReadException
java.io.IOException
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getICCProfileBytes
public byte[] getICCProfileBytes(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageReadException, java.io.IOException
Description copied from class:ImageParser
Get an array of bytes describing the International Color Consortium (ICC) specification for the color space of the image contained in the input byteSource. Not all formats support ICC profiles.- Specified by:
getICCProfileBytes
in classImageParser
- Parameters:
byteSource
- A valid ByteSource.params
- Optional instructions for special-handling or interpretation of the input data.- Returns:
- If available, a valid array of bytes; otherwise, a null
- Throws:
ImageReadException
- In the event that the specified content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful read or access operation.
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getImageSize
public java.awt.Dimension getImageSize(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageReadException, java.io.IOException
Description copied from class:ImageParser
Get the size of the image described by the specified ByteSource.- Specified by:
getImageSize
in classImageParser
- Parameters:
byteSource
- A valid reference to a ByteSource.params
- Optional instructions for special-handling or interpretation of the input data.- Returns:
- A valid instance of Dimension.
- Throws:
ImageReadException
- In the event that the specified content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful read or access operation.
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getMetadata
public ImageMetadata getMetadata(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageReadException, java.io.IOException
Description copied from class:ImageParser
Get image metadata from the specified byte source. Format-specific ImageParser implementations are expected to return a valid IImageMetadata object or to throw an ImageReadException if unable to process the specified byte source.The params argument provides a mechanism for individual implementations to pass optional information into the parser. Not all formats will require this capability. Because the base class may call this method with a null params argument, implementations should always include logic for ignoring null input.
- Specified by:
getMetadata
in classImageParser
- Parameters:
byteSource
- A valid byte source.params
- Optional instructions for special-handling or interpretation of the input data (null objects are permitted and must be supported by implementations).- Returns:
- A valid, potentially subject-matter-specific implementation of the IImageMetadata interface describing the content extracted from the source content.
- Throws:
ImageReadException
- In the event that the ByteSource content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful data read operation.
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filterChunks
private java.util.List<PngChunk> filterChunks(java.util.List<PngChunk> chunks, ChunkType type)
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getTransparencyFilter
private TransparencyFilter getTransparencyFilter(PngColorType pngColorType, PngChunk pngChunktRNS) throws ImageReadException, java.io.IOException
- Throws:
ImageReadException
java.io.IOException
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getImageInfo
public ImageInfo getImageInfo(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageReadException, java.io.IOException
Description copied from class:ImageParser
Get image information from the specified ByteSource. Format-specific ImageParser implementations are expected to return a valid ImageInfo object or to throw an ImageReadException if unable to process the specified data.The params argument provides a mechanism for individual implementations to pass optional information into the parser. Not all formats will require this capability. Because the base class may call this method with a null params argument, implementations should always include logic for ignoring null input.
- Specified by:
getImageInfo
in classImageParser
- Parameters:
byteSource
- A valid ByteSource objectparams
- Optional instructions for special-handling or interpretation of the input data (null objects are permitted and must be supported by implementations).- Returns:
- A valid image information object describing the content extracted from the specified data.
- Throws:
ImageReadException
- In the event that the specified content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful data access operation.
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getBufferedImage
public java.awt.image.BufferedImage getBufferedImage(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageReadException, java.io.IOException
Description copied from class:ImageParser
Gets a buffered image specified by the byte source (for sources that specify multiple images, choice of which image is returned is implementation dependent).- Specified by:
getBufferedImage
in classImageParser
- Parameters:
byteSource
- A valid instance of ByteSourceparams
- Optional instructions for special-handling or interpretation of the input data (null objects are permitted and must be supported by implementations).- Returns:
- A valid instance of BufferedImage.
- Throws:
ImageReadException
- In the event that the specified content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful read or access operation.
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dumpImageFile
public boolean dumpImageFile(java.io.PrintWriter pw, ByteSource byteSource) throws ImageReadException, java.io.IOException
Description copied from class:ImageParser
Write the ImageInfo and format-specific information for the image content of the specified byte source to a PrintWriter- Overrides:
dumpImageFile
in classImageParser
- Parameters:
pw
- print writer used for writing the ImageInfobyteSource
- A valid byte source.- Returns:
- A valid PrintWriter.
- Throws:
ImageReadException
- In the event that the specified content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful read or access operation.
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writeImage
public void writeImage(java.awt.image.BufferedImage src, java.io.OutputStream os, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageWriteException, java.io.IOException
Description copied from class:ImageParser
Writes the content of a BufferedImage to the specified output stream.The params argument provides a mechanism for individual implementations to pass optional information into the parser. Not all formats will support this capability. Currently, some of the parsers do not check for null arguments. So in cases where no optional specifications are supported, application code should pass in an empty instance of an implementation of the map interface (i.e. an empty HashMap).
- Overrides:
writeImage
in classImageParser
- Parameters:
src
- An image giving the source content for outputos
- A valid output stream for storing the formatted imageparams
- A non-null Map implementation supplying optional, format-specific instructions for output (such as selections for data compression, color models, etc.)- Throws:
ImageWriteException
- In the event that the output format cannot handle the input image or invalid params are specified.java.io.IOException
- In the event of an write error from the output stream.
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getXmpXml
public java.lang.String getXmpXml(ByteSource byteSource, java.util.Map<java.lang.String,java.lang.Object> params) throws ImageReadException, java.io.IOException
Description copied from interface:XmpEmbeddable
Get a string containing XML-formatted text conforming to the Extensible Metadata Platform (EXP) standard for representing information about image content. Not all image formats support EXP information and even for those that do, there is no guarantee that such information will be present in an image.- Specified by:
getXmpXml
in interfaceXmpEmbeddable
- Parameters:
byteSource
- A valid reference to a ByteSource.params
- Optional instructions for special-handling or interpretation of the input data.- Returns:
- If XMP metadata is present, a valid string; if it is not present, a null.
- Throws:
ImageReadException
- In the event that the specified content does not conform to the format of the specific parser implementation.java.io.IOException
- In the event of unsuccessful read or access operation.
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