/**
 * 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
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://www.pdfbox.org
 *
 */
package org.pdfbox.util.operator;

import java.util.List;
import org.apache.log4j.Logger;
import org.pdfbox.cos.COSNumber;
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: 1.4 $
 */
public class SetCharSpacing extends OperatorProcessor 
{

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

    /**
     * process : Tc Set character spacing.
     * @param operator The operator that is being executed.
     * @param arguments List
     */
    public void process(PDFOperator operator, List arguments) 
    {
        //set character spacing
        if( arguments.size() > 0 )
        {
            //There are some documents which are incorrectly structured, and have
            //a wrong number of arguments to this, so we will assume the last argument 
            //in the list
            Object charSpacing = arguments.get( arguments.size()-1 );
            if( charSpacing instanceof COSNumber )
            {
                COSNumber characterSpacing = (COSNumber)charSpacing;
                if (LOG.isDebugEnabled())
                {
                    LOG.debug("<Tc characterSpacing=\"" + characterSpacing.floatValue() + "\" />");
                }
                context.getGraphicsState().getTextState().setCharacterSpacing( characterSpacing.floatValue() );
            }
        }
    }
}