ExprNodeValidated.java

/*
 * *************************************************************************************
 *  Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 *  http://esper.codehaus.org                                                          *
 *  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;

import com.espertech.esper.client.EventBean;

import java.util.Map;

/**
 * A placeholder for another expression node that has been validated already.
 */
public class ExprNodeValidated extends ExprNodeBase implements ExprEvaluator
{
    private final ExprNode inner;
    private static final long serialVersionUID = 301058622892268624L;

    /**
     * Ctor.
     * @param inner nested expression node
     */
    public ExprNodeValidated(ExprNode inner)
    {
        this.inner = inner;
    }

    public ExprEvaluator getExprEvaluator()
    {
        return this;
    }

    public String toExpressionString()
    {
        return inner.toExpressionString();
    }

    public boolean isConstantResult()
    {
        return inner.isConstantResult();
    }

    public boolean equalsNode(ExprNode node)
    {
        if (node instanceof ExprNodeValidated)
        {
            return inner.equalsNode(((ExprNodeValidated) node).inner);
        }
        return inner.equalsNode(node);
    }

    public Map<String, Object> getEventType() {
        return null;
    }

    public void validate(ExprValidationContext validationContext) throws ExprValidationException
    {
    }

    public void accept(ExprNodeVisitor visitor)
    {
        if (visitor.isVisit(this))
        {
            visitor.visit(this);
            inner.accept(visitor);
        }
    }

    public Class getType()
    {
        return inner.getExprEvaluator().getType();
    }

    public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext)
    {
        return inner.getExprEvaluator().evaluate(eventsPerStream, isNewData, exprEvaluatorContext);
    }
}