content: /*
   * $Header$
   * $Revision$
   * $Date$
   *
   * ====================================================================
   *
   * 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 <bob@werken.com> and
   * James Strachan <jstrachan@apache.org>.  For more information on the
   * Jaxen Project, please see <http://www.jaxen.org/>.
   *
   * $Id$
   */
  
  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
       * <code>1</code> 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 <code>=</code>. This is equivalent to <code>==</code>
       * in Java. This is a comparison operator, not an assignment operator.
       */
      final static int EQUALS              =  1;
      
      /**
       * The not equal to operator <code>!=</code>
       */
      final static int NOT_EQUALS          =  2;
      
      // Relational
      /**
       * The less-than operator <code>&lt;</code>
       */
      final static int LESS_THAN           =  3;
      
      /**
       * The less-than-or-equal-to operator <code>&lt;=</code>
       */
      final static int LESS_THAN_EQUALS    =  4;
  
      /**
       * The greater-than operator <code>></code>
       */
      final static int GREATER_THAN        =  5;
  
      /**
       * The greater-than or equals operator <code>>=</code>
       */
      final static int GREATER_THAN_EQUALS =  6;
      
      // Additive
  
      /**
       * The addition operator <code>+</code>
       */
      final static int ADD                 =  7;
  
      /**
       * The subtraction operator <code>-</code>
       */
      final static int SUBTRACT            =  8;
  
      // Multiplicative
  
      /**
       * The multiplication operator <code>*</code>
       */
      final static int MULTIPLY            =  9;
  
      /**
       * The remainder operator <code>mod</code>. This is equivalent to
       * <code>%</code> in Java. 
       */
      final static int MOD                 = 10;
  
      /**
       * The floating point division operator <code>div</code>.  This is equivalent to
       * <code>/</code> in Java. 
       */
      final static int DIV                 = 11;
  
      // Unary
  
      /**
       * Unary <code>-</code>
       */
      final static int NEGATIVE            = 12;
  }
  