/*
* 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.google;
import java.util.Iterator;
import java.util.List;
import org.teiid.language.Select;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.translator.DataNotAvailableException;
import org.teiid.translator.ExecutionContext;
import org.teiid.translator.ResultSetExecution;
import org.teiid.translator.TranslatorException;
import org.teiid.translator.google.api.GoogleSpreadsheetConnection;
import org.teiid.translator.google.api.result.SheetRow;
import org.teiid.translator.google.visitor.SpreadsheetSQLVisitor;
/**
* Execution of SELECT Command
*
* @author felias
*
*/
public class SpreadsheetQueryExecution implements ResultSetExecution {
private Select query;
private GoogleSpreadsheetConnection connection;
private Iterator<SheetRow> rowIterator;
private ExecutionContext executionContext;
public SpreadsheetQueryExecution(Select query,
GoogleSpreadsheetConnection connection, ExecutionContext executionContext) {
this.executionContext = executionContext;
this.connection = connection;
this.query = query;
}
@Override
public void close() {
LogManager.logDetail(LogConstants.CTX_CONNECTOR, SpreadsheetExecutionFactory.UTIL.getString("close_query")); //$NON-NLS-1$
}
@Override
public void cancel() throws TranslatorException {
LogManager.logDetail(LogConstants.CTX_CONNECTOR, SpreadsheetExecutionFactory.UTIL.getString("cancel_query")); //$NON-NLS-1$
}
@Override
public void execute() throws TranslatorException {
SpreadsheetSQLVisitor visitor = new SpreadsheetSQLVisitor(connection.getSpreadsheetInfo());
visitor.translateSQL(query);
rowIterator = connection.executeQuery(visitor.getWorksheetTitle(), visitor.getTranslatedSQL(), visitor.getOffsetValue(),visitor.getLimitValue(), executionContext.getBatchSize()).iterator();
}
@Override
public List<?> next() throws TranslatorException, DataNotAvailableException {
if (rowIterator.hasNext()) {
return rowIterator.next().getRow();
}
return null;
}
}