/*
* 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.translator.jpa;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import org.teiid.language.QueryExpression;
import org.teiid.language.Select;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.metadata.RuntimeMetadata;
import org.teiid.translator.DataNotAvailableException;
import org.teiid.translator.ExecutionContext;
import org.teiid.translator.ResultSetExecution;
import org.teiid.translator.TranslatorException;
public class JPQLQueryExecution extends JPQLBaseExecution implements ResultSetExecution {
private QueryExpression command;
private Iterator resultsIterator;
private JPA2ExecutionFactory executionFactory;
public JPQLQueryExecution(JPA2ExecutionFactory executionFactory, QueryExpression command, ExecutionContext executionContext, RuntimeMetadata metadata, EntityManager em) {
super(executionContext, metadata, em);
this.command = command;
this.executionFactory = executionFactory;
}
@Override
public void execute() throws TranslatorException {
String jpql = JPQLSelectVisitor.getJPQLString((Select)this.command, this.executionFactory, this.metadata);
LogManager.logTrace(LogConstants.CTX_CONNECTOR, "JPA Source-Query:", jpql); //$NON-NLS-1$
Query query = this.enityManager.createQuery(jpql);
List results = query.getResultList();
this.resultsIterator = results.iterator();
}
@Override
public List<?> next() throws TranslatorException, DataNotAvailableException {
if (this.resultsIterator != null && this.resultsIterator.hasNext()) {
Object obj = this.resultsIterator.next();
if (obj instanceof Object[]) {
return Arrays.asList((Object[])obj);
}
return Arrays.asList(obj);
}
return null;
}
@Override
public void close() {
// no close
this.resultsIterator = null;
}
@Override
public void cancel() throws TranslatorException {
// no cancel
}
}