/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License, version 2 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/gpl-2.0.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 General Public License for more details.
*
*
* Copyright 2008 Pentaho Corporation. All rights reserved.
*/
package org.pentaho.aggdes.ui.util;
import org.pentaho.aggdes.model.Attribute;
import org.pentaho.aggdes.model.Measure;
import org.pentaho.aggdes.model.Schema;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
/**
* This class handles the Serialization of Attributes
*
* @author Will Gorman (wgorman@pentaho.com)
*/
public class AttributeConverter implements Converter {
Schema schema;
public AttributeConverter(Schema schema) {
this.schema = schema;
}
public void marshal(Object object, HierarchicalStreamWriter writer, MarshallingContext context) {
Attribute attribute = (Attribute)object;
writer.startNode("label");
writer.setValue(attribute.getLabel());
writer.endNode();
writer.startNode("table");
writer.setValue(attribute.getTable().getLabel());
writer.endNode();
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
reader.moveDown();
String label = reader.getValue();
reader.moveUp();
reader.moveDown();
String tableLabel = reader.getValue();
reader.moveUp();
Attribute foundAttrib = null;
for (Attribute attribute : schema.getAttributes()) {
if (attribute.getLabel().equals(label) &&
attribute.getTable().getLabel().equals(tableLabel))
{
foundAttrib = attribute;
break;
}
}
if (foundAttrib == null) {
throw new RuntimeException("Error: Unable to find attribute");
}
return foundAttrib;
}
public boolean canConvert(Class clazz) {
return Attribute.class.isAssignableFrom(clazz) &&
!Measure.class.isAssignableFrom(clazz);
}
}