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/*
 * $Header$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Jaxen Project and was originally
 * created by bob mcwhirter  and
 * James Strachan .  For more information on the
 * Jaxen Project, please see .
 *
 * $Id$
 */

package org.jaxen.saxpath;

/**
 * Constants used to represent XPath operators.
 */
public interface Operator
{
    /**
     * Indicates that we're passing through a grammar production without
     * actually activating it. For example in the expression
     * 1 is matches AdditiveExpr and MultiplicativeExpr in 
     * the XPath grammar, even though it has neither a plus, 
     * minus, multiplication, or other sign.
     */
    final static int NO_OP               =  0;
    
    // Equality
    /**
     * The equal to operator =. This is equivalent to ==
     * in Java. This is a comparison operator, not an assignment operator.
     */
    final static int EQUALS              =  1;
    
    /**
     * The not equal to operator !=
     */
    final static int NOT_EQUALS          =  2;
    
    // Relational
    /**
     * The less-than operator <
     */
    final static int LESS_THAN           =  3;
    
    /**
     * The less-than-or-equal-to operator <=
     */
    final static int LESS_THAN_EQUALS    =  4;

    /**
     * The greater-than operator >
     */
    final static int GREATER_THAN        =  5;

    /**
     * The greater-than or equals operator >=
     */
    final static int GREATER_THAN_EQUALS =  6;
    
    // Additive

    /**
     * The addition operator +
     */
    final static int ADD                 =  7;

    /**
     * The subtraction operator -
     */
    final static int SUBTRACT            =  8;

    // Multiplicative

    /**
     * The multiplication operator *
     */
    final static int MULTIPLY            =  9;

    /**
     * The remainder operator mod. This is equivalent to
     * % in Java. 
     */
    final static int MOD                 = 10;

    /**
     * The floating point division operator div.  This is equivalent to
     * / in Java. 
     */
    final static int DIV                 = 11;

    // Unary

    /**
     * Unary -
     */
    final static int NEGATIVE            = 12;
}