/**************************************************************************************
 * 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.filter;

import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.pattern.MatchedEventMap;

/**
 * A String-typed value as a filter parameter representing a range.
 */
public class RangeValueString implements FilterSpecParamRangeValue
{
    private static final long serialVersionUID = -2813440284912349247L;

    private final String theStringValue;

    /**
     * Ctor.
     * @param theStringValue is the value of the range endpoint
     */
    public RangeValueString(String theStringValue)
    {
        this.theStringValue = theStringValue;
    }

    public final String getFilterValue(MatchedEventMap matchedEvents, ExprEvaluatorContext exprEvaluatorContext)
    {
        return theStringValue;
    }

    public final String toString()
    {
        return theStringValue;
    }

    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        RangeValueString that = (RangeValueString) o;

        if (theStringValue != null ? !theStringValue.equals(that.theStringValue) : that.theStringValue != null) return false;

        return true;
    }

    public int hashCode() {
        return theStringValue != null ? theStringValue.hashCode() : 0;
    }
}