/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.pvm.internal.wire.binding;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.jbpm.pvm.internal.util.XmlUtil;
import org.jbpm.pvm.internal.wire.Descriptor;
import org.jbpm.pvm.internal.wire.descriptor.MapDescriptor;
import org.jbpm.pvm.internal.wire.xml.WireParser;
import org.jbpm.pvm.internal.xml.Parse;
import org.jbpm.pvm.internal.xml.Parser;
import org.w3c.dom.Element;

/** parses a descriptor for creating a {@link java.util.Map}.
 * 
 * See schema docs for more details.
 * 
 * @author Tom Baeyens
 * @author Guillaume Porcher (documentation)
 */
public class MapBinding extends WireDescriptorBinding {

  public MapBinding() {
    super("map");
  }

  public Object parse(Element element, Parse parse, Parser parser) {
    MapDescriptor descriptor = new MapDescriptor();
    String className = XmlUtil.attribute(element,"class");
    if (AbstractCollectionBinding.verify(className, Map.class, parse, parser)) {
      descriptor.setClassName(className);
    }
    
    Boolean isSynchronized = XmlUtil.attributeBoolean(element, "synchronized", false, parse);
    if (isSynchronized!=null) {
      descriptor.setSynchronized(isSynchronized.booleanValue());
    }

    List<Descriptor> keyDescriptors = new ArrayList<Descriptor>();
    List<Descriptor> valueDescriptors = new ArrayList<Descriptor>();
    List<Element> elements = XmlUtil.elements(element);
    for (Element entryElement: elements) {
      if ("entry".equals(XmlUtil.getTagLocalName(entryElement))) {
        // key
        Element keyElement = XmlUtil.element(entryElement, "key");
        Element keyDescriptorElement = (keyElement!=null ? XmlUtil.element(keyElement) : null);
        Descriptor keyDescriptor = (Descriptor) parser.parseElement(keyDescriptorElement, parse, WireParser.CATEGORY_DESCRIPTOR);
        // value
        Element valueElement = XmlUtil.element(entryElement, "value");
        Element valueDescriptorElement = (valueElement!=null ? XmlUtil.element(valueElement) : null);
        Descriptor valueDescriptor = (Descriptor) parser.parseElement(valueDescriptorElement, parse, WireParser.CATEGORY_DESCRIPTOR);

        if ( (keyDescriptor!=null)
             && (valueDescriptor!=null)
           ) {
          keyDescriptors.add(keyDescriptor);
          valueDescriptors.add(valueDescriptor);
        } else {
          parse.addProblem("entry must have key and value element with a single descriptor as contents: "+XmlUtil.toString(entryElement), element);
        }
      } else {
        parse.addProblem("map can only contain entry elements: "+XmlUtil.toString(entryElement));
      }
    }

    descriptor.setKeyDescriptors(keyDescriptors);
    descriptor.setValueDescriptors(valueDescriptors);
    return descriptor;
  }
}