/*
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* 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.relational;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.teiid.api.exception.query.ExpressionEvaluationException;
import org.teiid.common.buffer.BlockedException;
import org.teiid.core.TeiidComponentException;
import org.teiid.query.eval.Evaluator;
import org.teiid.query.processor.ProcessorPlan;
import org.teiid.query.sql.LanguageObject;
import org.teiid.query.sql.lang.SubqueryContainer;
import org.teiid.query.sql.lang.TableFunctionReference;
import org.teiid.query.sql.symbol.ElementSymbol;
import org.teiid.query.sql.symbol.Expression;
import org.teiid.query.sql.visitor.ValueIteratorProviderCollectorVisitor;
public abstract class SubqueryAwareRelationalNode extends RelationalNode {
private SubqueryAwareEvaluator evaluator;
protected SubqueryAwareRelationalNode() {
super();
}
public SubqueryAwareRelationalNode(int nodeID) {
super(nodeID);
}
protected Evaluator getEvaluator(Map elementMap) {
if (this.evaluator == null) {
this.evaluator = new SubqueryAwareEvaluator(elementMap, getDataManager(), getContext(), getBufferManager());
} else {
this.evaluator.initialize(getContext(), getDataManager());
}
return this.evaluator;
}
@Override
public void reset() {
super.reset();
if (evaluator != null) {
evaluator.reset();
}
}
@Override
public void closeDirect() {
if (evaluator != null) {
evaluator.close();
}
}
protected void setReferenceValues(TableFunctionReference ref) throws ExpressionEvaluationException, BlockedException, TeiidComponentException {
if (ref.getCorrelatedReferences() == null) {
return;
}
for (Map.Entry<ElementSymbol, Expression> entry : ref.getCorrelatedReferences().asMap().entrySet()) {
getContext().getVariableContext().setValue(entry.getKey(), getEvaluator(Collections.emptyMap()).evaluate(entry.getValue(), null));
}
}
abstract public Collection<? extends LanguageObject> getObjects();
@Override
public Boolean requiresTransaction(boolean transactionalReads) {
List<SubqueryContainer<?>> valueIteratorProviders = ValueIteratorProviderCollectorVisitor.getValueIteratorProviders(getObjects());
return requiresTransaction(transactionalReads, valueIteratorProviders);
}
public static Boolean requiresTransaction(boolean transactionalReads,
List<SubqueryContainer<?>> valueIteratorProviders) {
for (SubqueryContainer<?> subquery : valueIteratorProviders) {
ProcessorPlan plan = subquery.getCommand().getProcessorPlan();
if (plan != null) {
Boolean txn = plan.requiresTransaction(transactionalReads);
if (txn == null || txn) {
return true; //we can't ensure that this is read only
}
}
}
return false;
}
}