QueryGraphValueEntryHashKeyedExpr.java

/*
 ***************************************************************************************
 *  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.join.plan;

import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.epl.expression.core.ExprNodeUtility;

public class QueryGraphValueEntryHashKeyedExpr extends QueryGraphValueEntryHashKeyed {
    private static final long serialVersionUID = 1069112032977675596L;

    private final boolean requiresKey;

    public QueryGraphValueEntryHashKeyedExpr(ExprNode keyExpr, boolean requiresKey) {
        super(keyExpr);
        this.requiresKey = requiresKey;
    }

    public boolean isRequiresKey() {
        return requiresKey;
    }

    public boolean isConstant() {
        return ExprNodeUtility.isConstantValueExpr(super.getKeyExpr());
    }

    public String toQueryPlan() {
        return ExprNodeUtility.toExpressionStringMinPrecedenceSafe(getKeyExpr());
    }
}