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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2009 Pentaho Corporation. All rights reserved.
*/
package org.pentaho.reporting.libraries.xmlns.parser;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.reporting.libraries.resourceloader.Resource;
import org.pentaho.reporting.libraries.resourceloader.ResourceCreationException;
import org.pentaho.reporting.libraries.resourceloader.ResourceData;
import org.pentaho.reporting.libraries.resourceloader.ResourceFactory;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;
import org.pentaho.reporting.libraries.resourceloader.SimpleResource;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
/**
* Todo: Document me!
* <p/>
* Date: 10.08.2009
* Time: 11:23:50
*
* @author Thomas Morgner.
*/
public class DomTreeResourceFactory implements ResourceFactory
{
private static class DomResource extends SimpleResource
{
public DomResource(final ResourceKey resourceKey,
final Document document,
final long version)
{
super(resourceKey, document, Document.class, version);
}
public Object getResource()
{
final Document resource = (Document) super.getResource();
return resource.cloneNode(true);
}
}
private static final Log logger = LogFactory.getLog(DomTreeResourceFactory.class);
/**
* Creates a resource by interpreting the data given in the resource-data object. If additional datastreams need to
* be parsed, the provided resource manager should be used.
*
* @param manager the resource manager used for all resource loading.
* @param data the resource-data from where the binary data is read.
* @param context the resource context used to resolve relative resource paths.
* @return the parsed result, never null.
* @throws org.pentaho.reporting.libraries.resourceloader.ResourceCreationException
* if the resource could not be parsed due to syntaxctial or logical errors in the data.
* @throws org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException
* if the resource could not be accessed from the physical storage.
*/
public Resource create(final ResourceManager manager,
final ResourceData data,
final ResourceKey context) throws ResourceCreationException, ResourceLoadingException
{
final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
dbf.setValidating(false);
try
{
final DocumentBuilder db = dbf.newDocumentBuilder();
db.setEntityResolver(ParserEntityResolver.getDefaultResolver());
db.setErrorHandler(new LoggingErrorHandler());
final ResourceDataInputSource input = new ResourceDataInputSource(data, manager);
return new DomResource(data.getKey(), db.parse(input), data.getVersion(manager));
}
catch (ParserConfigurationException e)
{
throw new ResourceCreationException("Unable to initialize the XML-Parser", e);
}
catch (SAXException e)
{
throw new ResourceCreationException("Unable to parse the document: " + data.getKey(), e);
}
catch (IOException e)
{
throw new ResourceLoadingException("Unable to read the stream from document: " + data.getKey(), e);
}
}
/**
* Initializes the resource factory. This usually loads all system resources from the environment and maybe sets up
* and initializes any factories needed during the parsing.
*/
public void initializeDefaults()
{
}
/**
* Returns the expected result type.
*
* @return the result type.
*/
public Class getFactoryType()
{
return Document.class;
}
}
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