Package org.apache.pdfbox.pdmodel.common
Class PDStream
java.lang.Object
org.apache.pdfbox.pdmodel.common.PDStream
- All Implemented Interfaces:
COSObjectable
- Direct Known Subclasses:
PDEmbeddedFile
,PDMemoryStream
,PDMetadata
,PDObjectStream
A PDStream represents a stream in a PDF document. Streams are tied to a
single PDF document.
- Version:
- $Revision: 1.17 $
- Author:
- Ben Litchfield
-
Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
PDStream()
This will create a new empty PDStream object.Creates a PDStream which wraps the given COSStream.PDStream
(PDDocument document) This will create a new empty PDStream object.PDStream
(PDDocument doc, InputStream str) Constructor.PDStream
(PDDocument doc, InputStream str, boolean filtered) Constructor. -
Method Summary
Modifier and TypeMethodDescriptionvoid
If there are not compression filters on the current stream then this will add a compression filter, flate compression for example.static PDStream
createFromCOS
(COSBase base) Create a pd stream from either a regular COSStream on a COSArray of cos streams.This will get a stream that can be read from.This will get a stream that can be written to.byte[]
This will copy the stream into a byte array.Convert this standard java object to a COS object.int
Get the decoded stream length.Get the list of decode parameters.getFile()
This will get the file specification for this stream.Get the list of decode parameters.This will get the list of filters that are associated with this stream.This will get the list of filters that are associated with this stream.A convenience method to get this stream as a string.int
This will get the length of the filtered/compressed stream.Get the metadata that is part of the document catalog.getPartiallyFilteredStream
(List<String> stopFilters) This will get a stream with some filters applied but not others.Get the cos stream associated with this object.void
setDecodedStreamLength
(int decodedStreamLength) Set the decoded stream length.void
setDecodeParms
(List<?> decodeParams) This will set the list of decode parameterss.void
Set the file specification.void
setFileDecodeParams
(List<?> decodeParams) This will set the list of decode params.void
setFileFilters
(List<String> filters) This will set the filters that are part of this stream.void
setFilters
(List<COSName> filters) This will set the filters that are part of this stream.void
setMetadata
(PDMetadata meta) Set the metadata for this object.
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Constructor Details
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PDStream
protected PDStream()This will create a new empty PDStream object. -
PDStream
This will create a new empty PDStream object.- Parameters:
document
- The document that the stream will be part of.
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PDStream
Creates a PDStream which wraps the given COSStream.- Parameters:
str
- The stream parameter.
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PDStream
Constructor. Reads all data from the input stream and embeds it into the document, this will close the InputStream.- Parameters:
doc
- The document that will hold the stream.str
- The stream parameter.- Throws:
IOException
- If there is an error creating the stream in the document.
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PDStream
Constructor. Reads all data from the input stream and embeds it into the document, this will close the InputStream.- Parameters:
doc
- The document that will hold the stream.str
- The stream parameter.filtered
- True if the stream already has a filter applied.- Throws:
IOException
- If there is an error creating the stream in the document.
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Method Details
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addCompression
public void addCompression()If there are not compression filters on the current stream then this will add a compression filter, flate compression for example. -
createFromCOS
Create a pd stream from either a regular COSStream on a COSArray of cos streams.- Parameters:
base
- Either a COSStream or COSArray.- Returns:
- A PDStream or null if base is null.
- Throws:
IOException
- If there is an error creating the PDStream.
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getCOSObject
Convert this standard java object to a COS object.- Specified by:
getCOSObject
in interfaceCOSObjectable
- Returns:
- The cos object that matches this Java object.
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createOutputStream
This will get a stream that can be written to.- Returns:
- An output stream to write data to.
- Throws:
IOException
- If an IO error occurs during writing.
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createInputStream
This will get a stream that can be read from.- Returns:
- An input stream that can be read from.
- Throws:
IOException
- If an IO error occurs during reading.
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getPartiallyFilteredStream
This will get a stream with some filters applied but not others. This is useful when doing images, ie filters = [flate,dct], we want to remove flate but leave dct- Parameters:
stopFilters
- A list of filters to stop decoding at.- Returns:
- A stream with decoded data.
- Throws:
IOException
- If there is an error processing the stream.
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getStream
Get the cos stream associated with this object.- Returns:
- The cos object that matches this Java object.
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getLength
public int getLength()This will get the length of the filtered/compressed stream. This is readonly in the PD Model and will be managed by this class.- Returns:
- The length of the filtered stream.
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getFilters
This will get the list of filters that are associated with this stream. Or null if there are none.- Returns:
- A list of all encoding filters to apply to this stream.
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setFilters
This will set the filters that are part of this stream.- Parameters:
filters
- The filters that are part of this stream.
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getDecodeParms
Get the list of decode parameters. Each entry in the list will refer to an entry in the filters list.- Returns:
- The list of decode parameters.
- Throws:
IOException
- if there is an error retrieving the parameters.
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setDecodeParms
This will set the list of decode parameterss.- Parameters:
decodeParams
- The list of decode parameterss.
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getFile
This will get the file specification for this stream. This is only required for external files.- Returns:
- The file specification.
- Throws:
IOException
- If there is an error creating the file spec.
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setFile
Set the file specification.- Parameters:
f
- The file specification.
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getFileFilters
This will get the list of filters that are associated with this stream. Or null if there are none.- Returns:
- A list of all encoding filters to apply to this stream.
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setFileFilters
This will set the filters that are part of this stream.- Parameters:
filters
- The filters that are part of this stream.
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getFileDecodeParams
Get the list of decode parameters. Each entry in the list will refer to an entry in the filters list.- Returns:
- The list of decode parameters.
- Throws:
IOException
- if there is an error retrieving the parameters.
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setFileDecodeParams
This will set the list of decode params.- Parameters:
decodeParams
- The list of decode params.
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getByteArray
This will copy the stream into a byte array.- Returns:
- The byte array of the filteredStream
- Throws:
IOException
- When getFilteredStream did not work
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getInputStreamAsString
A convenience method to get this stream as a string. Uses the default system encoding.- Returns:
- a String representation of this (input) stream.
- Throws:
IOException
- if there is an error while converting the stream to a string.
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getMetadata
Get the metadata that is part of the document catalog. This will return null if there is no meta data for this object.- Returns:
- The metadata for this object.
- Throws:
IllegalStateException
- if the value of the metadata entry is different from a stream or null
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setMetadata
Set the metadata for this object. This can be null.- Parameters:
meta
- The meta data for this object.
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getDecodedStreamLength
public int getDecodedStreamLength()Get the decoded stream length.- Returns:
- the decoded stream length
- Since:
- Apache PDFBox 1.1.0
- See Also:
-
setDecodedStreamLength
public void setDecodedStreamLength(int decodedStreamLength) Set the decoded stream length.- Parameters:
decodedStreamLength
- the decoded stream length- Since:
- Apache PDFBox 1.1.0
- See Also:
-