/*
***************************************************************************************
* 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.parse;
import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.epl.generated.EsperEPL2GrammarParser;
import com.espertech.esper.epl.spec.FilterSpecRaw;
import com.espertech.esper.epl.spec.PropertyEvalSpec;
import org.antlr.v4.runtime.tree.Tree;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Builds a filter specification from filter AST nodes.
*/
public class ASTFilterSpecHelper {
public static FilterSpecRaw walkFilterSpec(EsperEPL2GrammarParser.EventFilterExpressionContext ctx, PropertyEvalSpec propertyEvalSpec, Map<Tree, ExprNode> astExprNodeMap) {
String eventName = ASTUtil.unescapeClassIdent(ctx.classIdentifier());
List<ExprNode> exprNodes = ctx.expressionList() != null ? ASTExprHelper.exprCollectSubNodes(ctx.expressionList(), 0, astExprNodeMap) : new ArrayList<ExprNode>(1);
return new FilterSpecRaw(eventName, exprNodes, propertyEvalSpec);
}
}