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 * Copyright (c) 2004, www.pdfbox.org
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    contributors may be used to endorse or promote products derived from this
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.pdfbox.util.operator;

import java.util.List;
import org.pdfbox.cos.COSName;
import org.pdfbox.pdmodel.graphics.color.PDColorSpace;
import org.pdfbox.pdmodel.graphics.color.PDColorSpaceFactory;
import org.pdfbox.pdmodel.graphics.color.PDColorSpaceInstance;
import org.pdfbox.pdmodel.graphics.color.PDDeviceCMYK;
import org.pdfbox.util.PDFOperator;

import java.io.IOException;

/**
 * <p>Structal modification of the PDFEngine class :
 * the long sequence of conditions in processOperator is remplaced by
 * this strategy pattern.</p>
 * 
 * @author Ben Litchfield (ben@csh.rit.edu)
 * @version $Revision: 1.3 $
 */

public class SetStrokingColorSpace extends OperatorProcessor 
{
    private static final float[] EMPTY_FLOAT_ARRAY = new float[0];

    /**
     * CS Set color space for stroking operations.
     * @param operator The operator that is being executed.
     * @param arguments List
     * @throws IOException If an error occurs while processing the font.
     */
    public void process(PDFOperator operator, List arguments) throws IOException
    {
        //(PDF 1.1) Set color space for stroking operations
        COSName name = (COSName)arguments.get( 0 );
        PDColorSpace cs = (PDColorSpace)context.getColorSpaces().get( name.getName() );
        if( cs == null )
        {
            cs = PDColorSpaceFactory.createColorSpace( name );
        }
        PDColorSpaceInstance colorInstance = context.getGraphicsState().getStrokingColorSpace();
        colorInstance.setColorSpace( cs );
        int numComponents = cs.getNumberOfComponents();
        float[] values = EMPTY_FLOAT_ARRAY;
        if( numComponents >= 0 )
        {
            values = new float[numComponents];
            for( int i=0; i<numComponents; i++ )
            {
                values[i] = 0f;
            }
            if( cs instanceof PDDeviceCMYK )
            {
                values[3] = 1f;
            }
        }
        colorInstance.setColorSpaceValue( values );
    }
}