/*
* 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) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.metadata.parser;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.reporting.engine.classic.core.ClassicEngineBoot;
import org.pentaho.reporting.engine.classic.core.metadata.DataFactoryMetaData;
import org.pentaho.reporting.engine.classic.core.metadata.ElementMetaDataParser;
import org.pentaho.reporting.libraries.base.config.Configuration;
import org.pentaho.reporting.libraries.base.util.StringUtils;
import org.pentaho.reporting.libraries.resourceloader.Resource;
import org.pentaho.reporting.libraries.resourceloader.ResourceException;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;
import org.pentaho.reporting.libraries.xmlns.parser.AbstractXmlReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Todo: Document Me
*
* @author Thomas Morgner
*/
public class DataFactoriesReadHandler extends AbstractXmlReadHandler
{
private static final Log logger = LogFactory.getLog(DataFactoriesReadHandler.class);
private ArrayList elements;
private GlobalMetaDefinition globalMetaDefinition;
private DataFactoryMetaDataCollection typeCollection;
public DataFactoriesReadHandler()
{
globalMetaDefinition = new GlobalMetaDefinition();
elements = new ArrayList();
}
/**
* Starts parsing.
*
* @param attrs the attributes.
* @throws SAXException if there is a parsing error.
*/
protected void startParsing(final Attributes attrs) throws SAXException
{
super.startParsing(attrs);
final ResourceManager resourceManager = getRootHandler().getResourceManager();
final ResourceKey context = getRootHandler().getContext();
final Configuration configuration = ClassicEngineBoot.getInstance().getGlobalConfig();
final Iterator keys = configuration.findPropertyKeys(ElementMetaDataParser.GLOBAL_INCLUDES_PREFIX);
while (keys.hasNext())
{
final String key = (String) keys.next();
final String href = configuration.getConfigProperty(key);
if (StringUtils.isEmpty(href, true))
{
continue;
}
try
{
final ResourceKey resourceKey = resourceManager.deriveKey(context, href);
final Resource resource = resourceManager.create(resourceKey, null, GlobalMetaDefinition.class);
globalMetaDefinition.merge((GlobalMetaDefinition) resource.getResource());
}
catch (ResourceException e)
{
logger.warn("Failed to parse included global definitions: " + getLocator(), e);
}
}
}
/**
* Returns the handler for a child element.
*
* @param uri the URI of the namespace of the current element.
* @param tagName the tag name.
* @param atts the attributes.
* @return the handler or null, if the tagname is invalid.
* @throws SAXException if there is a parsing error.
*/
protected XmlReadHandler getHandlerForChild(final String uri,
final String tagName,
final Attributes atts) throws SAXException
{
if (getUri().equals(uri) == false)
{
return null;
}
if ("data-factory".equals(tagName))
{
final DataFactoryReadHandler readHandler = new DataFactoryReadHandler();
elements.add(readHandler);
return readHandler;
}
return null;
}
/**
* Done parsing.
*
* @throws SAXException if there is a parsing error.
*/
protected void doneParsing() throws SAXException
{
final DataFactoryMetaData[] result = new DataFactoryMetaData[elements.size()];
for (int i = 0; i < elements.size(); i++)
{
final DataFactoryReadHandler handler = (DataFactoryReadHandler) elements.get(i);
result[i] = (DataFactoryMetaData) handler.getObject();
}
typeCollection = new DataFactoryMetaDataCollection(result);
}
/**
* Returns the object for this element or null, if this element does not create an object.
*
* @return the object.
* @throws SAXException if an parser error occured.
*/
public Object getObject() throws SAXException
{
return typeCollection;
}
}