MapElementExporter.java

/*
 * This is a common dao with basic CRUD operations and is not limited to any
 * persistent layer implementation
 *
 * Copyright (C) 2009 Imran M Yousuf (imyousuf@smartitengineering.com)
 *
 * This library 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 3 of the License, or (at your option) any later version.
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.smartitengineering.exim.impl.xml;

import com.smartitengineering.exim.AssociationConfig.AssociationType;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import javax.xml.transform.sax.TransformerHandler;
import org.xml.sax.helpers.AttributesImpl;

/**
 *
 * @author imyousuf
 * @since 0.4
 */
public class MapElementExporter
				extends AbstractElementExporter
				implements ElementExporter {

		private static ElementExporter exporter;

		static {
				exporter = new MapElementExporter();
				for (AssociationType type : exporter.getSupportedTypes()) {
						XMLExporterImpl.addHandler(type, exporter);
				}
		}

		public static ElementExporter getInstance() {
				return exporter;
		}

		public MapElementExporter() {
				Collections.addAll(types, AssociationType.TYPE_MAP);
		}

		public void exportElement(AssociationType type,
															Object object,
															TransformerHandler handler)
						throws IOException {
				if (type == null || object == null || handler == null) {
						throw new IOException("All parameters are required!");
				}
				try {
						AttributesImpl atts = new AttributesImpl();
						handler.startElement(EXIM_COLLECN_URI, EXIM_COLLECTION_NS, type.
										getSimpleName(), atts);
						Map map = (Map) object;
						Set<Map.Entry> objects = map.entrySet();
						for (Map.Entry entry : objects) {
								Object key = entry.getKey();
								Object value = entry.getValue();
								handler.startElement("", "", "key",
												atts);
								AssociationType associationType = AssociationType.
												getAssociationType(key.getClass());
								XMLExporterImpl.getElementExporter(associationType).
												exportElement(associationType, key, handler);
								handler.endElement("", "", "key");
								handler.startElement("", "", "value",
												atts);
								associationType = AssociationType.getAssociationType(value.
												getClass());
								XMLExporterImpl.getElementExporter(associationType).
												exportElement(associationType, value, handler);
								handler.endElement("", "", "value");
						}
						handler.endElement(EXIM_COLLECN_URI, EXIM_COLLECTION_NS, type.
										getSimpleName());
				}
				catch (Exception ex) {
						throw new IOException(ex);
				}
		}
}