/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.processor.xml;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.teiid.api.exception.query.ExpressionEvaluationException;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidProcessingException;
import org.teiid.query.eval.Evaluator;
import org.teiid.query.sql.lang.Criteria;
import org.teiid.query.sql.symbol.ElementSymbol;
/**
* A condition based on a sql Criteria Object.
*/
public class CriteriaCondition extends Condition {
protected Criteria criteria;
/**
* The constructor takes the sql criteria object, the list of result set names which
* the Criteria pertains to, and a sub Program which is the "then" clause if this
* Condition {link #evaluate evaluates} to true.
* @param criteria sql Criteria
* @param resultSetNames zero or more String result set names which pertain to the
* criteria
* @param thenProgram Program which is the "then" clause
*/
public CriteriaCondition(Criteria criteria, Program thenProgram){
super( thenProgram );
this.criteria = criteria;
}
/**
* @see org.teiid.query.processor.xml.Condition#evaluate(Map, List, ProcessorEnvironment)
*/
public boolean evaluate(XMLProcessorEnvironment env, XMLContext context)
throws TeiidComponentException, TeiidProcessingException{
Map elementMap = new HashMap();
List data = new ArrayList();
// these are all the reference values; ElementSymbol ==> Symbol Current value
// however since the CriteriaEvaluator needs ElementSybol ==> $index && value[$index]
// we need to convert these values.
Map referenceValues = context.getReferenceValues();
int index = 0;
for (final Iterator i = referenceValues.keySet().iterator(); i.hasNext();) {
final ElementSymbol element = (ElementSymbol)i.next();
elementMap.put(element, new Integer(index));
data.add(referenceValues.get(element));
index++;
}
try {
return new Evaluator(elementMap, env.getDataManager(), env.getProcessorContext()).evaluate(this.criteria, data);
} catch (ExpressionEvaluationException e) {
throw new TeiidComponentException(e);
}
}
public String toString(){
return criteria.toString();
}
}