/**
 * Copyright (c) 2004, www.pdfbox.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of pdfbox; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 * http://www.pdfbox.org
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 */
package org.pdfbox.util.operator;

import java.util.List;
import org.pdfbox.cos.COSNumber;
import org.apache.log4j.Logger;
import org.pdfbox.util.Matrix;
import org.pdfbox.util.PDFOperator;

/**
 *
 * <p>Titre : PDFEngine Modification.</p>
 * <p>Description : Structal modification of the PDFEngine class :
* the long sequence of conditions in processOperator is remplaced by
* this strategy pattern</p>
 * <p>Copyright : Copyright (c) 2004</p>
 * <p>Société : DBGS</p>
 * @author Huault : huault@free.fr
 * @version $Revision: 1.3 $
 */

public class Concatenate extends OperatorProcessor 
{

    private static final Logger LOG = Logger.getLogger(Concatenate.class);

    /**
     * process : cm : Concatenate matrix to current transformation matrix.
     * @param operator The operator that is being executed.
     * @param arguments List
     */
    public void process(PDFOperator operator, List arguments) 
    {

        //concatenate matrix to current transformation matrix
        COSNumber a = (COSNumber) arguments.get(0);
        COSNumber b = (COSNumber) arguments.get(1);
        COSNumber c = (COSNumber) arguments.get(2);
        COSNumber d = (COSNumber) arguments.get(3);
        COSNumber e = (COSNumber) arguments.get(4);
        COSNumber f = (COSNumber) arguments.get(5);
    
        if( LOG.isDebugEnabled() ) 
        {
            LOG.debug("<cm " +
                    "a=\"" + a.floatValue() + "\" " +
                    "b=\"" + b.floatValue() + "\" " +
                    "c=\"" + c.floatValue() + "\" " +
                    "d=\"" + d.floatValue() + "\" " +
                    "e=\"" + e.floatValue() + "\" " +
                    "f=\"" + f.floatValue() + "\" > " +
                    this.toString() + " from " + context.toString());
        }
    
        Matrix newMatrix = new Matrix();
        newMatrix.setValue(0, 0, a.floatValue());
        newMatrix.setValue(0, 1, b.floatValue());
        newMatrix.setValue(1, 0, c.floatValue());
        newMatrix.setValue(1, 1, d.floatValue());
        newMatrix.setValue(2, 0, e.floatValue());
        newMatrix.setValue(2, 1, f.floatValue());
    
        // wprinz: BUG Fix:
        // In PDF, matrices have to be multiplied from left to right
        // (the new matrix is left, the old one(s) are right)
        
        Matrix old_ctm = context.getGraphicsState().getCurrentTransformationMatrix();
        Matrix matrix_to_concat = newMatrix;
        Matrix new_ctm = matrix_to_concat.multiply(old_ctm);
        context.getGraphicsState().setCurrentTransformationMatrix(
                new_ctm );
        
        // :wprinz

    }

}