Package org.dozer.loader.xml

Source Code of org.dozer.loader.xml.DozerResolver

/*
* 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.dozer.config.BeanContainer;
import org.dozer.util.DozerClassLoader;
import org.dozer.util.DozerConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;

import java.io.InputStream;
import java.net.URL;

/**
* Internal EntityResolver implementation to load Xml Schema from the dozer classpath resp. JAR file.
*
* <p>
* Fetches "beanmapping.xsd" from the classpath resource "/beanmapping.xsd", no matter if specified as some
* local URL or as "http://dozer.sourceforge.net/schema/beanmapping.xsd".
*
* @author garsombke.franz
*/
public class DozerResolver implements EntityResolver {

  private static final Logger log = LoggerFactory.getLogger(DozerResolver.class);

  public InputSource resolveEntity(String publicId, String systemId) {
    log.debug("Trying to resolve XML entity with public ID [{}] and system ID [{}]", publicId, systemId);
    if (systemId != null && systemId.indexOf(DozerConstants.XSD_NAME) > systemId.lastIndexOf("/")) {
      String fileName = systemId.substring(systemId.indexOf(DozerConstants.XSD_NAME));
      log.debug("Trying to locate [{}] in classpath", fileName);
      try {
        DozerClassLoader classLoader = BeanContainer.getInstance().getClassLoader();
        URL url = classLoader.loadResource(fileName);
        InputStream stream = url.openStream();
        InputSource source = new InputSource(stream);
        source.setPublicId(publicId);
        source.setSystemId(systemId);
        log.debug("Found beanmapping XML Schema [{}] in classpath", systemId);
        return source;
      } catch (Exception ex) {
        log.error("Could not resolve beanmapping XML Schema [" + systemId + "]: not found in classpath", ex);
      }
    }
    // use the default behaviour -> download from website or wherever
    return null;
  }
}
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