/*
* 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.modules.parser.ext.readhandlers;
import org.pentaho.reporting.engine.classic.core.filter.DataSource;
import org.pentaho.reporting.engine.classic.core.filter.DataTarget;
import org.pentaho.reporting.engine.classic.core.modules.parser.base.PropertyAttributes;
import org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.base.ObjectDescription;
import org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.datasource.DataSourceCollector;
import org.pentaho.reporting.libraries.xmlns.parser.ParseException;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.xml.sax.SAXException;
public class DataSourceReadHandler extends CompoundObjectReadHandler
{
private DataSourceReadHandler childHandler;
public DataSourceReadHandler()
{
super(null);
}
/**
* Starts parsing.
*
* @param attrs the attributes.
* @throws org.xml.sax.SAXException if there is a parsing error.
*/
protected void startParsing(final PropertyAttributes attrs)
throws SAXException
{
final String typeName = attrs.getValue(getUri(), "type");
if (typeName == null)
{
throw new ParseException("The datasource type must be specified",
getRootHandler().getDocumentLocator());
}
final DataSourceCollector fc = (DataSourceCollector) getRootHandler()
.getHelperObject(ReportDefinitionReadHandler.DATASOURCE_FACTORY_KEY);
final ObjectDescription od = fc.getDataSourceDescription(typeName);
if (od == null)
{
throw new ParseException("The specified DataSource type is not defined", getLocator());
}
setObjectDescription(od);
}
/**
* Returns the handler for a child element.
*
* @param tagName the tag name.
* @param atts the attributes.
* @return the handler or null, if the tagname is invalid.
* @throws org.xml.sax.SAXException if there is a parsing error.
*/
protected XmlReadHandler getHandlerForChild(final String uri,
final String tagName,
final PropertyAttributes atts)
throws SAXException
{
if (isSameNamespace(uri) == false)
{
return null;
}
if ("datasource".equals(tagName))
{
childHandler = new DataSourceReadHandler();
return childHandler;
}
return super.getHandlerForChild(uri, tagName, atts);
}
/**
* Returns the object for this element or null, if this element does not create an object.
*
* @return the object.
*/
public Object getObject()
{
final DataSource ds = (DataSource) super.getObject();
if (childHandler != null && ds instanceof DataTarget)
{
final DataTarget dt = (DataTarget) ds;
dt.setDataSource((DataSource) childHandler.getObject());
}
return ds;
}
}