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Dozer is a powerful Java Bean to Java Bean mapper that recursively copies data from one object to another

There is a newer version: 5.5.1

/*
 * Copyright 2005-2010 the original author or authors.
 *
 * 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.dozer.loader.xml;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dozer.classmap.MappingFileData;
import org.dozer.util.MappingUtils;
import org.dozer.util.ResourceLoader;
import org.w3c.dom.Document;

import javax.xml.parsers.DocumentBuilder;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

/**
 * Internal class that reads and parses a single custom mapping xml file into raw ClassMap objects. Only intended for
 * internal use.
 *
 * @author tierney.matt
 * @author garsombke.franz
 */
public class MappingFileReader {

  private static final Log log = LogFactory.getLog(MappingFileReader.class);

  private final DocumentBuilder documentBuilder;

  public MappingFileReader(XMLParserFactory parserFactory) {
    documentBuilder = parserFactory.createParser();
  }

  public MappingFileData read(String fileName) {
    ResourceLoader loader = new ResourceLoader();
    URL url = loader.getResource(fileName);
    return read(url);
  }

  public MappingFileData read(URL url) {
    MappingFileData result = null;
    InputStream stream = null;
    try {
      stream = url.openStream();
      Document document = documentBuilder.parse(stream);
      
      XMLParser parser = new XMLParser();
      result = parser.parse(document);
    } catch (Throwable e) {
      log.error("Error while loading dozer mapping file url: [" + url + "] : " + e);
      MappingUtils.throwMappingException(e);
    } finally {
      try {
        if (stream != null) {
          stream.close();
        }
      } catch (IOException e) {
        MappingUtils.throwMappingException(e);
      }
    }
    return result;
  }

}