/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.client.EventType;
import com.espertech.esper.collection.ViewUpdatedCollection;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.core.context.util.AgentInstanceViewFactoryChainContext;
import com.espertech.esper.core.service.StatementContext;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.view.*;
import java.util.List;
/**
* Factory for {@link com.espertech.esper.view.window.TimeBatchView}.
*/
public class LengthBatchViewFactory implements DataWindowViewFactory, DataWindowViewWithPrevious, DataWindowBatchingViewFactory {
/**
* The length window size.
*/
protected ExprEvaluator sizeEvaluator;
private EventType eventType;
public void setViewParameters(ViewFactoryContext viewFactoryContext, List<ExprNode> expressionParameters) throws ViewParameterException {
sizeEvaluator = ViewFactorySupport.validateSizeSingleParam(getViewName(), viewFactoryContext, expressionParameters);
}
public void attach(EventType parentEventType, StatementContext statementContext, ViewFactory optionalParentFactory, List<ViewFactory> parentViewFactories) throws ViewParameterException {
this.eventType = parentEventType;
}
public Object makePreviousGetter() {
return new RelativeAccessByEventNIndexGetterImpl();
}
public View makeView(AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext) {
int size = ViewFactorySupport.evaluateSizeParam(getViewName(), sizeEvaluator, agentInstanceViewFactoryContext.getAgentInstanceContext());
ViewUpdatedCollection viewUpdatedCollection = agentInstanceViewFactoryContext.getStatementContext().getViewServicePreviousFactory().getOptPreviousExprRelativeAccess(agentInstanceViewFactoryContext);
if (agentInstanceViewFactoryContext.isRemoveStream()) {
return new LengthBatchViewRStream(agentInstanceViewFactoryContext, this, size);
} else {
return new LengthBatchView(agentInstanceViewFactoryContext, this, size, viewUpdatedCollection);
}
}
public EventType getEventType() {
return eventType;
}
public boolean canReuse(View view, AgentInstanceContext agentInstanceContext) {
if (!(view instanceof LengthBatchView)) {
return false;
}
LengthBatchView myView = (LengthBatchView) view;
int size = ViewFactorySupport.evaluateSizeParam(getViewName(), sizeEvaluator, agentInstanceContext);
return myView.getSize() == size && myView.isEmpty();
}
public String getViewName() {
return "Length-Batch";
}
}