ExprEqualsNode.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.expression.ops;

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

/**
 * Represents an equals (=, !=, <>, is, is not) comparator in a filter expressiun tree.
 */
public interface ExprEqualsNode extends ExprNode {
    /**
     * Returns true if this is a NOT EQUALS node, false if this is a EQUALS node.
     *
     * @return true for !=, false for =
     */
    public boolean isNotEquals();

    /**
     * Returns true if this is a "IS" or "IS NOT" node, false if this is a EQUALS or NOT EQUALS node.
     *
     * @return true for !=, false for =
     */
    public boolean isIs();
}