/**********************************************************************
Copyright (c) 2008 Andy Jefferson and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Contributors:
...
**********************************************************************/
package org.datanucleus.query.evaluator.memory;
import javax.jdo.JDOHelper;
import org.datanucleus.query.expression.InvokeExpression;
import org.datanucleus.query.expression.PrimaryExpression;
import org.datanucleus.util.Localiser;
/**
* Evaluator for the function JDOHelper.getVersion(obj).
*/
public class JDOHelperGetVersionFunctionEvaluator implements InvocationEvaluator
{
/** Localisation utility for output messages */
protected static final Localiser LOCALISER = Localiser.getInstance("org.datanucleus.Localisation",
org.datanucleus.ClassConstants.NUCLEUS_CONTEXT_LOADER);
/* (non-Javadoc)
* @see org.datanucleus.query.evaluator.memory.InvocationEvaluator#evaluate(org.datanucleus.query.expression.InvokeExpression, org.datanucleus.query.evaluator.memory.InMemoryExpressionEvaluator)
*/
public Object evaluate(InvokeExpression expr, Object invokedValue, InMemoryExpressionEvaluator eval)
{
// TODO Check whether first param is primary expression?
PrimaryExpression paramExpr = (PrimaryExpression)expr.getArguments().get(0);
Object value = eval.getValueForPrimaryExpression(paramExpr);
return JDOHelper.getVersion(value);
}
}