/**************************************************************************************
* 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.epl.expression.ExprNode;
import com.espertech.esper.event.arr.ObjectArrayEventBean;
import com.espertech.esper.event.map.MapEventBean;
import com.espertech.esper.view.View;
import com.espertech.esper.view.ViewFactoryContext;
import com.espertech.esper.view.ViewParameterException;
import com.espertech.esper.view.ViewServiceHelper;
import java.util.HashMap;
import java.util.List;
/**
* Factory for {@link com.espertech.esper.view.window.ExpressionWindowView}.
*/
public class ExpressionWindowViewFactory extends ExpressionViewFactoryBase
{
public void setViewParameters(ViewFactoryContext viewFactoryContext, List<ExprNode> expressionParameters) throws ViewParameterException
{
if (expressionParameters.size() != 1) {
String errorMessage = getViewName() + " view requires a single expression as a parameter";
throw new ViewParameterException(errorMessage);
}
expiryExpression = expressionParameters.get(0);
}
public View makeView(final AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext)
{
ObjectArrayEventBean builtinBean = new ObjectArrayEventBean(ExpressionViewOAFieldEnum.getPrototypeOA(), builtinMapType);
IStreamRandomAccess randomAccess = ViewServiceHelper.getOptPreviousExprRandomAccess(agentInstanceViewFactoryContext);
return new ExpressionWindowView(this, randomAccess, expiryExpression.getExprEvaluator(), aggregationServiceFactoryDesc, builtinBean, variableNames, agentInstanceViewFactoryContext);
}
public Object makePreviousGetter() {
return new RandomAccessByIndexGetter();
}
public String getViewName() {
return "Expression";
}
}