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* Copyright (c) 2006, www.pdfbox.org
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* contributors may be used to endorse or promote products derived from this
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package org.pdfbox.pdmodel.common.function;
import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSBase;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSFloat;
import org.pdfbox.cos.COSName;
import org.pdfbox.pdmodel.common.PDRange;
/**
* This class represents a function in a PDF document.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.3 $
*/
public abstract class PDDictionaryFunction extends PDFunction
{
private COSDictionary function = null;
/**
* Constructor to create a new blank function, should only be called by
* subclasses.
*
* @param functionType An integer describing the function type, only 0,2,3,4
* are defined by the PDF sepc.
*/
protected PDDictionaryFunction( int functionType )
{
function = new COSDictionary();
function.setInt( "FunctionType", functionType );
}
/**
* Constructor.
*
* @param functionDictionary The prepopulated function dictionary.
*/
public PDDictionaryFunction( COSDictionary functionDictionary )
{
function = functionDictionary;
}
/**
* {@inheritDoc}
*/
public COSBase getCOSObject()
{
return function;
}
/**
* Get the underlying cos dictionary.
*
* @return The underlying cos dictionary.
*/
public COSDictionary getCOSDictionary()
{
return function;
}
private COSArray getRangeArray( String fieldName, int n )
{
COSArray rangeArray = (COSArray)function.getDictionaryObject( COSName.getPDFName( "Range" ) );
if( rangeArray == null )
{
rangeArray = new COSArray();
function.setItem( fieldName, rangeArray );
while( rangeArray.size() < n*2 )
{
rangeArray.add( new COSFloat( 0 ) );
rangeArray.add( new COSFloat( 0 ) );
}
}
return rangeArray;
}
/**
* {@inheritDoc}
*/
public int getNumberOfOutputParameters()
{
COSArray array = getRangeArray( "Range", 0 );
return array.size() / 2;
}
/**
* {@inheritDoc}
*/
public PDRange getRangeForOutput( int n )
{
COSArray rangeArray = getRangeArray( "Range", n );
return new PDRange( rangeArray, n );
}
/**
* {@inheritDoc}
*/
public void setRangeForOutput( PDRange range, int n )
{
COSArray rangeArray = getRangeArray("Range", n );
rangeArray.set( n*2, new COSFloat( range.getMin() ) );
rangeArray.set( n*2+1, new COSFloat( range.getMax() ) );
}
/**
* {@inheritDoc}
*/
public int getNumberOfInputParameters()
{
COSArray array = getRangeArray( "Domain", 0 );
return array.size() / 2;
}
/**
* {@inheritDoc}
*/
public PDRange getDomainForInput( int n )
{
COSArray rangeArray = getRangeArray( "Domain", n );
return new PDRange( rangeArray, n );
}
/**
* {@inheritDoc}
*/
public void setDomainForInput( PDRange range, int n )
{
COSArray rangeArray = getRangeArray("Domain", n );
rangeArray.set( n*2, new COSFloat( range.getMin() ) );
rangeArray.set( n*2+1, new COSFloat( range.getMax() ) );
}
}