/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.core.service;
import com.espertech.esper.client.EPOnDemandQueryResult;
import com.espertech.esper.client.EPStatementException;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.context.ContextPartitionSelector;
import com.espertech.esper.core.start.EPPreparedExecuteMethod;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Provides prepared query functionality.
*/
public class EPPreparedQueryImpl implements EPOnDemandPreparedQuerySPI
{
private static final Log log = LogFactory.getLog(EPPreparedQueryImpl.class);
private final EPPreparedExecuteMethod executeMethod;
private final String epl;
/**
* Ctor.
* @param executeMethod used at execution time to obtain query results
* @param epl is the EPL to execute
*/
public EPPreparedQueryImpl(EPPreparedExecuteMethod executeMethod, String epl)
{
this.executeMethod = executeMethod;
this.epl = epl;
}
public EPOnDemandQueryResult execute()
{
return executeInternal(null);
}
public EPOnDemandQueryResult execute(ContextPartitionSelector[] contextPartitionSelectors) {
if (contextPartitionSelectors == null) {
throw new IllegalArgumentException("No context partition selectors provided");
}
return executeInternal(contextPartitionSelectors);
}
private EPOnDemandQueryResult executeInternal(ContextPartitionSelector[] contextPartitionSelectors) {
try
{
EPPreparedQueryResult result = executeMethod.execute(contextPartitionSelectors);
return new EPQueryResultImpl(result);
}
catch (EPStatementException ex)
{
throw ex;
}
catch (Throwable t)
{
String message = "Error executing statement: " + t.getMessage();
log.error("Error executing on-demand statement '" + epl + "': " + t.getMessage(), t);
throw new EPStatementException(message, epl);
}
}
public EPPreparedExecuteMethod getExecuteMethod() {
return executeMethod;
}
public EventType getEventType()
{
return executeMethod.getEventType();
}
}