public PDStreamFunction(PDStream functionDictionary) 
{
        function = functionDictionary;
}

Constructor.

Parameters:

functionDictionary - The prepopulated function dictionary.

 protected PDStreamFunction(PDDocument doc,
    int functionType) 
{
        function = new PDStream( doc );
        function.getStream().setInt( "FunctionType", functionType );
}

Constructor to create a new blank function, should only be called by subclasses.

Parameters:

doc - The document that this function is part of.

functionType - An integer describing the function type, only 0,2,3,4 are defined by the PDF sepc.

 public COSBase getCOSObject() 
{
        return function.getCOSObject();
}

Convert this standard java object to a COS object.

 public COSStream getCOSStream() 
{
        return function.getStream();
}

This will get the underlying array value.

 public PDRange getDomainForInput(int n) 
{
        COSArray rangeArray = getRangeArray( "Domain", n );
        return new PDRange( rangeArray, n );
}

This will get the range for a certain input parameter. This is will never return null. If it is not present then the range 0 to 0 will be returned.

 public int getNumberOfInputParameters() 
{
        COSArray array = getRangeArray( "Domain", 0 );
        return array.size() / 2;
}

This will get the number of input parameters that have a domain specified.

 public int getNumberOfOutputParameters() 
{
        COSArray array = getRangeArray( "Range", 0 );
        return array.size() / 2;
}

This will get the number of output parameters that have a range specified. A range for output parameters is optional so this may return zero for a function that does have output parameters, this will simply return the number that have the rnage specified.

 public PDRange getRangeForOutput(int n) 
{
        COSArray rangeArray = getRangeArray( "Range", n );
        return new PDRange( rangeArray, n );
}

This will get the range for a certain output parameters. This is will never return null. If it is not present then the range 0 to 0 will be returned.

 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() ) );
}

This will set the domain for the input values.

 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() ) );
}

This will set the a range for output parameter.