/**************************************************************************************
* 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.view.window;
import com.espertech.esper.core.context.util.AgentInstanceViewFactoryChainContext;
import com.espertech.esper.core.service.ExprEvaluatorContextStatement;
import com.espertech.esper.epl.expression.ExprNode;
import com.espertech.esper.event.arr.ObjectArrayEventBean;
import com.espertech.esper.view.*;
import java.util.List;
/**
* Factory for {@link ExpressionBatchView}.
*/
public class ExpressionBatchViewFactory extends ExpressionViewFactoryBase implements DataWindowBatchingViewFactory
{
private boolean includeTriggeringEvent = true;
public void setViewParameters(ViewFactoryContext viewFactoryContext, List<ExprNode> expressionParameters) throws ViewParameterException
{
if (expressionParameters.size() != 1 && expressionParameters.size() != 2) {
String errorMessage = getViewName() + " view requires a single expression as a parameter, or an expression and boolean flag";
throw new ViewParameterException(errorMessage);
}
expiryExpression = expressionParameters.get(0);
if (expressionParameters.size() > 1) {
Object result = ViewFactorySupport.evaluateAssertNoProperties(getViewName(), expressionParameters.get(1), 1, new ExprEvaluatorContextStatement(viewFactoryContext.getStatementContext()));
includeTriggeringEvent = (Boolean) result;
}
}
public View makeView(final AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext)
{
ObjectArrayEventBean builtinBean = new ObjectArrayEventBean(ExpressionViewOAFieldEnum.getPrototypeOA(), builtinMapType);
IStreamRelativeAccess relativeAccessByEvent = ViewServiceHelper.getOptPreviousExprRelativeAccess(agentInstanceViewFactoryContext);
return new ExpressionBatchView(this, relativeAccessByEvent, expiryExpression.getExprEvaluator(), aggregationServiceFactoryDesc, builtinBean, variableNames, agentInstanceViewFactoryContext);
}
public Object makePreviousGetter() {
return new RelativeAccessByEventNIndexMap();
}
public boolean isIncludeTriggeringEvent() {
return includeTriggeringEvent;
}
public String getViewName() {
return "Expression-batch";
}
}