org.apache.pdfbox.cos

Class COSStream

java.lang.Object

org.apache.pdfbox.cos.COSBase

org.apache.pdfbox.cos.COSDictionary

org.apache.pdfbox.cos.COSStream

All Implemented Interfaces:

Closeable, AutoCloseable, COSObjectable

Direct Known Subclasses:

COSStreamArray

public class COSStream
extends COSDictionary
implements Closeable

This class represents a stream object in a PDF document.

Author:

Ben Litchfield

Field Summary

Fields inherited from class org.apache.pdfbox.cos.COSDictionary

items

Constructor Summary

Constructors

Constructor and Description
COSStream(COSDictionary dictionary, RandomAccess storage) Constructor.
COSStream(RandomAccess storage) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Object	accept(ICOSVisitor visitor) visitor pattern double dispatch method.
void	close()
OutputStream	createFilteredStream() This will create a new stream for which filtered byte should be written to.
OutputStream	createFilteredStream(COSBase expectedLength) This will create a new stream for which filtered byte should be written to.
OutputStream	createUnfilteredStream() This will create an output stream that can be written to.
long	getFilteredLength() This will get the length of the encoded stream.
long	getFilteredLengthWritten() This will get the length of the data written in the encoded stream.
InputStream	getFilteredStream() This will get the stream with all of the filters applied.
COSBase	getFilters() This will return the filters to apply to the byte stream.
RandomAccess	getScratchFile() Deprecated. the direct access to the scratch file will be removed.
List<Object>	getStreamTokens() This will get all the tokens in the stream.
InputStream	getUnfilteredStream() This will get the logical content stream with none of the filters.
void	replaceWithStream(COSStream stream) Deprecated. will be removed
void	setFilteredLength(long length) This will set the expected length of the encoded stream.
void	setFilters(COSBase filters) set the filters to be applied to the stream.

Methods inherited from class org.apache.pdfbox.cos.COSDictionary

addAll, clear, containsKey, containsKey, containsValue, entrySet, getBoolean, getBoolean, getBoolean, getDate, getDate, getDate, getDate, getDictionaryObject, getDictionaryObject, getDictionaryObject, getDictionaryObject, getDictionaryObject, getEmbeddedDate, getEmbeddedDate, getEmbeddedDate, getEmbeddedDate, getEmbeddedInt, getEmbeddedInt, getEmbeddedInt, getEmbeddedInt, getEmbeddedString, getEmbeddedString, getEmbeddedString, getEmbeddedString, getFloat, getFloat, getFloat, getFloat, getInt, getInt, getInt, getInt, getInt, getInt, getInt, getItem, getItem, getKeyForValue, getLong, getLong, getLong, getLong, getLong, getNameAsString, getNameAsString, getNameAsString, getNameAsString, getObjectFromPath, getString, getString, getString, getString, getValues, keyList, keySet, mergeInto, removeItem, setBoolean, setBoolean, setDate, setDate, setEmbeddedDate, setEmbeddedDate, setEmbeddedInt, setEmbeddedInt, setEmbeddedString, setEmbeddedString, setFloat, setFloat, setInt, setInt, setItem, setItem, setItem, setItem, setLong, setLong, setName, setName, setString, setString, size, toString

Methods inherited from class org.apache.pdfbox.cos.COSBase

getCOSObject, getFilterManager, isDirect, isNeedToBeUpdate, setDirect, setNeedToBeUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

COSStream

public COSStream(RandomAccess storage)

Constructor. Creates a new stream with an empty dictionary.

Parameters:

storage - The intermediate storage for the stream.

COSStream

public COSStream(COSDictionary dictionary,
         RandomAccess storage)

Constructor.

Parameters:

dictionary - The dictionary that is associated with this stream.

storage - The intermediate storage for the stream.

Method Detail

replaceWithStream

public void replaceWithStream(COSStream stream)

Deprecated. will be removed

This will replace this object with the data from the new object. This is used to easily maintain referential integrity when changing references to new objects.

Parameters:

stream - The stream that have the new values in it.

getScratchFile

public RandomAccess getScratchFile()

Deprecated. the direct access to the scratch file will be removed.

This will get the scratch file associated with this stream.

Returns:

The scratch file where this stream is being stored.

getStreamTokens

public List<Object> getStreamTokens()
                             throws IOException

This will get all the tokens in the stream.

Returns:

All of the tokens in the stream.

Throws:

IOException - If there is an error parsing the stream.

getFilteredStream

public InputStream getFilteredStream()
                              throws IOException

This will get the stream with all of the filters applied.

Returns:

the bytes of the physical (endoced) stream

Throws:

IOException - when encoding/decoding causes an exception

getFilteredLength

public long getFilteredLength()
                       throws IOException

This will get the length of the encoded stream.

Returns:

the length of the encoded stream as long

Throws:

IOException

setFilteredLength

public void setFilteredLength(long length)

This will set the expected length of the encoded stream. Call this method if the previously set expected length is wrong, to avoid further trouble.

Parameters:

length - the expected length of the encoded stream.

getFilteredLengthWritten

public long getFilteredLengthWritten()
                              throws IOException

This will get the length of the data written in the encoded stream.

Returns:

the length of the data written in the encoded stream as long

Throws:

IOException

getUnfilteredStream

public InputStream getUnfilteredStream()
                                throws IOException

This will get the logical content stream with none of the filters.

Returns:

the bytes of the logical (decoded) stream

Throws:

IOException - when encoding/decoding causes an exception

accept

public Object accept(ICOSVisitor visitor)
              throws COSVisitorException

visitor pattern double dispatch method.

Overrides:

accept in class COSDictionary

Parameters:

visitor - The object to notify when visiting this object.

Returns:

any object, depending on the visitor implementation, or null

Throws:

COSVisitorException - If an error occurs while visiting this object.

getFilters

public COSBase getFilters()

This will return the filters to apply to the byte stream. The method will return - null if no filters are to be applied - a COSName if one filter is to be applied - a COSArray containing COSNames if multiple filters are to be applied

Returns:

the COSBase object representing the filters

createFilteredStream

public OutputStream createFilteredStream()
                                  throws IOException

This will create a new stream for which filtered byte should be written to. You probably don't want this but want to use the createUnfilteredStream, which is used to write raw bytes to.

Returns:

A stream that can be written to.

Throws:

IOException - If there is an error creating the stream.

createFilteredStream

public OutputStream createFilteredStream(COSBase expectedLength)
                                  throws IOException

This will create a new stream for which filtered byte should be written to. You probably don't want this but want to use the createUnfilteredStream, which is used to write raw bytes to.

Parameters:

expectedLength - An entry where a length is expected.

Returns:

A stream that can be written to.

Throws:

IOException - If there is an error creating the stream.

setFilters

public void setFilters(COSBase filters)
                throws IOException

set the filters to be applied to the stream.

Parameters:

filters - The filters to set on this stream.

Throws:

IOException - If there is an error clearing the old filters.

createUnfilteredStream

public OutputStream createUnfilteredStream()
                                    throws IOException

This will create an output stream that can be written to.

Returns:

An output stream which raw data bytes should be written to.

Throws:

IOException - If there is an error creating the stream.

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable