/*
***************************************************************************************
* 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.filter;
import java.io.Serializable;
import java.io.StringWriter;
/**
* This interface represents one filter parameter in an {@link FilterValueSet} filter specification.
* <p> Each filtering parameter has a lookup-able and operator type, and a value to filter for.
*/
public interface FilterValueSetParam extends Serializable {
/**
* Returns the lookup-able for the filter parameter.
*
* @return lookup-able
*/
public FilterSpecLookupable getLookupable();
/**
* Returns the filter operator type.
*
* @return filter operator type
*/
public FilterOperator getFilterOperator();
/**
* Return the filter parameter constant to filter for.
*
* @return filter parameter constant's value
*/
public Object getFilterForValue();
public void appendTo(StringWriter writer);
}