/*
* 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.mongodb;
import java.util.ArrayList;
import java.util.List;
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.mongodb.MongoDBConnection;
import org.teiid.translator.DataNotAvailableException;
import org.teiid.translator.ExecutionContext;
import org.teiid.translator.ResultSetExecution;
import org.teiid.translator.TranslatorException;
import com.mongodb.*;
public class MongoDBQueryExecution extends MongoDBBaseExecution implements ResultSetExecution {
private Select command;
private MongoDBExecutionFactory executionFactory;
private Cursor results;
private MongoDBSelectVisitor visitor;
private Class<?>[] expectedTypes;
public MongoDBQueryExecution(
MongoDBExecutionFactory executionFactory,
QueryExpression command, ExecutionContext executionContext,
RuntimeMetadata metadata, MongoDBConnection connection) {
super(executionContext, metadata, connection);
this.command = (Select)command;
this.executionFactory = executionFactory;
this.expectedTypes = command.getColumnTypes();
}
@Override
public void execute() throws TranslatorException {
this.visitor = new MongoDBSelectVisitor(this.executionFactory, this.metadata);
this.visitor.visitNode(this.command);
if (!this.visitor.exceptions.isEmpty()) {
throw this.visitor.exceptions.get(0);
}
LogManager.logInfo(LogConstants.CTX_CONNECTOR, this.command);
DBCollection collection = this.mongoDB.getCollection(this.visitor.mongoDoc.getTargetTable().getName());
if (collection != null) {
// TODO: check to see how to pass the hint
ArrayList<DBObject> ops = new ArrayList<DBObject>();
for (ProcessingNode ref:this.visitor.mergePlanner.getNodes()) {
buildAggregate(ops, ref.getInstruction());
}
if (this.visitor.project.isEmpty()) {
throw new TranslatorException(MongoDBPlugin.Event.TEIID18025, MongoDBPlugin.Util.gs(MongoDBPlugin.Event.TEIID18025));
}
assert visitor.selectColumns.size() == visitor.selectColumnReferences.size();
if (this.visitor.projectBeforeMatch) {
buildAggregate(ops, "$project", this.visitor.project); //$NON-NLS-1$
}
buildAggregate(ops, "$match", this.visitor.match); //$NON-NLS-1$
buildAggregate(ops, "$group", this.visitor.group); //$NON-NLS-1$
buildAggregate(ops, "$match", this.visitor.having); //$NON-NLS-1$
if (!this.visitor.projectBeforeMatch) {
buildAggregate(ops, "$project", this.visitor.project); //$NON-NLS-1$
}
buildAggregate(ops, "$sort", this.visitor.sort); //$NON-NLS-1$
buildAggregate(ops, "$skip", this.visitor.skip); //$NON-NLS-1$
buildAggregate(ops, "$limit", this.visitor.limit); //$NON-NLS-1$
try {
this.results = collection.aggregate(ops, this.executionFactory.getOptions(this.executionContext.getBatchSize()));
} catch (MongoException e) {
throw new TranslatorException(e);
}
}
}
private void buildAggregate(List<DBObject> query, String type, Object object) {
if (object != null) {
LogManager.logDetail(LogConstants.CTX_CONNECTOR, "{\""+type+"\": {"+object.toString()+"}}"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
query.add(new BasicDBObject(type, object));
}
}
private void buildAggregate(List<DBObject> query, DBObject dbObject) {
if (dbObject != null) {
query.add(dbObject);
}
}
@Override
public List<?> next() throws TranslatorException, DataNotAvailableException {
if (this.results != null && this.results.hasNext()) {
DBObject result = this.results.next();
if (result != null) {
ArrayList row = new ArrayList();
for (int i = 0; i < this.visitor.selectColumns.size();i++) {
row.add(this.executionFactory.retrieveValue(result.get(this.visitor.selectColumns.get(i)), this.expectedTypes[i], this.mongoDB, this.visitor.selectColumns.get(i), this.visitor.selectColumnReferences.get(i)));
}
return row;
}
}
return null;
}
@Override
public void close() {
if (this.results != null) {
this.results.close();
this.results = null;
}
}
@Override
public void cancel() throws TranslatorException {
close();
}
}