/*
***************************************************************************************
* 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.expression.dot;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.rettype.EPType;
import com.espertech.esper.epl.rettype.EPTypeHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Array;
public class ExprDotEvalArrayGet implements ExprDotEval {
private static final Logger log = LoggerFactory.getLogger(ExprDotEvalArrayGet.class);
private final EPType typeInfo;
private final ExprEvaluator indexExpression;
public ExprDotEvalArrayGet(ExprEvaluator index, Class componentType) {
this.indexExpression = index;
this.typeInfo = EPTypeHelper.singleValue(componentType);
}
public Object evaluate(Object target, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
if (target == null) {
return null;
}
Object index = indexExpression.evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
if (index == null) {
return null;
}
if (!(index instanceof Integer)) {
return null;
}
int indexNum = (Integer) index;
if (Array.getLength(target) <= indexNum) {
return null;
}
return Array.get(target, indexNum);
}
public EPType getTypeInfo() {
return typeInfo;
}
public void visit(ExprDotEvalVisitor visitor) {
visitor.visitArraySingleItemSource();
}
}