/*
***************************************************************************************
* 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.epl.core;
import com.espertech.esper.client.EventType;
import com.espertech.esper.core.context.util.AgentInstanceContext;
import com.espertech.esper.epl.agg.service.AggregationService;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.spec.OutputLimitLimitType;
import com.espertech.esper.epl.spec.OutputLimitSpec;
/**
* Result set processor prototype for the simplest case: no aggregation functions used in the select clause, and no group-by.
*/
public class ResultSetProcessorSimpleFactory implements ResultSetProcessorFactory {
private final boolean isSelectRStream;
private final SelectExprProcessor selectExprProcessor;
private final ExprEvaluator optionalHavingExpr;
private final OutputLimitSpec outputLimitSpec;
private final boolean enableOutputLimitOpt;
private final ResultSetProcessorHelperFactory resultSetProcessorHelperFactory;
private final int numStreams;
public ResultSetProcessorSimpleFactory(SelectExprProcessor selectExprProcessor,
ExprEvaluator optionalHavingNode,
boolean isSelectRStream,
OutputLimitSpec outputLimitSpec,
boolean enableOutputLimitOpt,
ResultSetProcessorHelperFactory resultSetProcessorHelperFactory,
int numStreams) {
this.selectExprProcessor = selectExprProcessor;
this.optionalHavingExpr = optionalHavingNode;
this.isSelectRStream = isSelectRStream;
this.outputLimitSpec = outputLimitSpec;
this.enableOutputLimitOpt = enableOutputLimitOpt;
this.resultSetProcessorHelperFactory = resultSetProcessorHelperFactory;
this.numStreams = numStreams;
}
public ResultSetProcessorType getResultSetProcessorType() {
return ResultSetProcessorType.UNAGGREGATED_UNGROUPED;
}
public ResultSetProcessor instantiate(OrderByProcessor orderByProcessor, AggregationService aggregationService, AgentInstanceContext agentInstanceContext) {
return new ResultSetProcessorSimple(this, selectExprProcessor, orderByProcessor, agentInstanceContext);
}
public EventType getResultEventType() {
return selectExprProcessor.getResultEventType();
}
public boolean hasAggregation() {
return false;
}
public boolean isSelectRStream() {
return isSelectRStream;
}
public ExprEvaluator getOptionalHavingExpr() {
return optionalHavingExpr;
}
public boolean isOutputLast() {
return outputLimitSpec != null && outputLimitSpec.getDisplayLimit() == OutputLimitLimitType.LAST;
}
public boolean isOutputAll() {
return outputLimitSpec != null && outputLimitSpec.getDisplayLimit() == OutputLimitLimitType.ALL;
}
public boolean isEnableOutputLimitOpt() {
return enableOutputLimitOpt;
}
public ResultSetProcessorHelperFactory getResultSetProcessorHelperFactory() {
return resultSetProcessorHelperFactory;
}
public int getNumStreams() {
return numStreams;
}
}