/*******************************************************************************
 * Copyright 2010 Simon Mieth
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package org.kabeja.dxf.parser;

import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

import org.kabeja.DraftDocument;
import org.kabeja.dxf.parser.entities.DXFEntityHandler;
import org.kabeja.entities.Entity;
import org.kabeja.parser.ParseException;


/**
 * @author <a href="mailto:simon.mieth@gmx.de>Simon Mieth</a>
 *
 *
 */
public class DXFEntitiesSectionHandler extends AbstractSectionHandler
    implements DXFSectionHandler, DXFHandlerManager {
    private static String SECTION_KEY = "ENTITIES";
    public static final int ENTITY_START = 0;
    protected Map<String,DXFHandler> handlers = new TreeMap<String,DXFHandler>();
    protected DXFEntityHandler handler = null;
    protected boolean parseEntity = false;

    public DXFEntitiesSectionHandler() {
    }

    /*
     * (non-Javadoc)
     *
     * @see org.dxf2svg.parser.SectionHandler#getSectionKey()
     */
    public String getSectionKey() {
        return SECTION_KEY;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.dxf2svg.parser.SectionHandler#parseGroup(int, java.lang.String)
     */
    public void parseGroup(int groupCode, DXFValue value) throws ParseException {
        if (groupCode == ENTITY_START) {
            if (parseEntity) {
                if (handler.isFollowSequence()) {
                    //there is a sequence like polyline
                    handler.parseGroup(groupCode, value);
                    return;
                } else {
                    endEntity();
                    //check for reuse
                    if(handler.getDXFEntityType().equals(value.getValue())){
                    	 handler.startDXFEntity();
                         parseEntity = true;
                         return;
                    }
                }
            }

            if (handlers.containsKey(value.getValue())) {
                //get handler for the new entity
                handler = (DXFEntityHandler) handlers.get(value.getValue());
                handler.setDocument(this.doc);
                handler.startDXFEntity();
                parseEntity = true;
            } else {
                //no handler found
                parseEntity = false;
            }
        } else if (parseEntity) {
            //handler.setDXFDocument(this.doc);
            handler.parseGroup(groupCode, value);
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see org.dxf2svg.parser.SectionHandler#setDXFDocument(org.dxf2svg.xml.DXFDocument)
     */
    public void setDocument(DraftDocument doc) {
        this.doc = doc;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.dxf2svg.parser.SectionHandler#endParsing()
     */
    public void endSection() {
        endEntity();
    }

    /*
     * (non-Javadoc)
     *
     * @see org.dxf2svg.parser.SectionHandler#startParsing()
     */
    public void startSection() {
        parseEntity = false;
    }

    protected void endEntity() {
        if (parseEntity) {
            handler.endDXFEntity();
            Entity entity = handler.getDXFEntity();
            doc.addEntity(entity);
        }
    }

    public void addDXFEntityHandler(DXFEntityHandler handler) {
        handler.setDocument(doc);
        handlers.put(handler.getDXFEntityType(), handler);
    }

    public void addHandler(DXFHandler handler) {
        addDXFEntityHandler((DXFEntityHandler) handler);
    }

    /* (non-Javadoc)
         * @see de.miethxml.kabeja.parser.Handler#releaseDXFDocument()
         */
    public void releaseDocument() {
        this.doc = null;

        Iterator i = handlers.values().iterator();

        while (i.hasNext()) {
            DXFHandler handler = (DXFHandler) i.next();
            handler.releaseDocument();
        }
    }
}