package com.tom_roush.pdfbox.pdmodel.common;
import com.tom_roush.pdfbox.cos.COSName;
import com.tom_roush.pdfbox.cos.COSStream;
import com.tom_roush.pdfbox.pdmodel.PDDocument;
/**
* A PDStream represents a stream in a PDF document. Streams are tied to a single
* PDF document.
*
* @author Ben Litchfield
*/
public class PDObjectStream extends PDStream
{
/**
* Constructor.
*
* @param str The stream parameter.
*/
public PDObjectStream( COSStream str )
{
super( str );
}
/**
* This will create a new PDObjectStream object.
*
* @param document The document that the stream will be part of.
* @return A new stream object.
*/
public static PDObjectStream createStream( PDDocument document )
{
COSStream cosStream = document.getDocument().createCOSStream();
PDObjectStream strm = new PDObjectStream( cosStream );
strm.getStream().setItem( COSName.TYPE, COSName.OBJ_STM );
return strm;
}
/**
* Get the type of this object, should always return "ObjStm".
*
* @return The type of this object.
*/
public String getType()
{
return getStream().getNameAsString( COSName.TYPE );
}
/**
* Get the number of compressed object.
*
* @return The number of compressed objects.
*/
public int getNumberOfObjects()
{
return getStream().getInt( COSName.N, 0 );
}
/**
* Set the number of objects.
*
* @param n The new number of objects.
*/
public void setNumberOfObjects( int n )
{
getStream().setInt( COSName.N, n );
}
/**
* The byte offset (in the decoded stream) of the first compressed object.
*
* @return The byte offset to the first object.
*/
public int getFirstByteOffset()
{
return getStream().getInt( COSName.FIRST, 0 );
}
/**
* The byte offset (in the decoded stream) of the first compressed object.
*
* @param n The byte offset to the first object.
*/
public void setFirstByteOffset( int n )
{
getStream().setInt( COSName.FIRST, n );
}
/**
* A reference to an object stream, of which the current object stream is
* considered an extension.
*
* @return The object that this stream is an extension.
*/
public PDObjectStream getExtends()
{
PDObjectStream retval = null;
COSStream stream = (COSStream)getStream().getDictionaryObject( COSName.EXTENDS );
if( stream != null )
{
retval = new PDObjectStream( stream );
}
return retval;
}
/**
* A reference to an object stream, of which the current object stream is
* considered an extension.
*
* @param stream The object stream extension.
*/
public void setExtends( PDObjectStream stream )
{
getStream().setItem( COSName.EXTENDS, stream );
}
}