/*
* $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/saxpath/Axis.java,v 1.8 2006/03/30 13:56:36 elharo Exp $
* $Revision: 1.8 $
* $Date: 2006/03/30 13:56:36 $
*
* ====================================================================
*
* 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: Axis.java,v 1.8 2006/03/30 13:56:36 elharo Exp $
*/
package org.jaxen.saxpath;
import org.jaxen.JaxenRuntimeException;
/**
*
* Internal SAXPath class that contains constants representing
* XPath operators to avoid a lot of string comparisons.
*/
public class Axis
{
private Axis() {}
// XXX Ultimately these should use the type-safe enum pattern instead
/** Marker for an invalid axis */
public final static int INVALID_AXIS = 0;
/** The <code>child</code> axis */
public final static int CHILD = 1;
/** The <code>descendant</code> axis */
public final static int DESCENDANT = 2;
/** The <code>parent</code> axis */
public final static int PARENT = 3;
/** The <code>ancestor</code> axis */
public final static int ANCESTOR = 4;
/** The <code>following-sibling</code> axis */
public final static int FOLLOWING_SIBLING = 5;
/** The <code>preceding-sibling</code> axis */
public final static int PRECEDING_SIBLING = 6;
/** The <code>following</code> axis */
public final static int FOLLOWING = 7;
/** The <code>preceding</code> axis */
public final static int PRECEDING = 8;
/** The <code>attribute</code> axis */
public final static int ATTRIBUTE = 9;
/** The <code>namespace</code> axis */
public final static int NAMESPACE = 10;
/** The <code>self</code> axis */
public final static int SELF = 11;
/** The <code>descendant-or-self</code> axis */
public final static int DESCENDANT_OR_SELF = 12;
/** The <code>ancestor-or-self</code> axis */
public final static int ANCESTOR_OR_SELF = 13;
/**
* <p>
* Returns the name of the axis.
* </p>
*
* @param axisNum the axis code
* @return the name of the axis such as might be used in an XPath expression
* @throws JaxenRuntimeException if the number does not represent one of the 13
* XPath axes
*/
public static String lookup(int axisNum)
{
switch ( axisNum )
{
case CHILD:
return "child";
case DESCENDANT:
return "descendant";
case PARENT:
return "parent";
case ANCESTOR:
return "ancestor";
case FOLLOWING_SIBLING:
return "following-sibling";
case PRECEDING_SIBLING:
return "preceding-sibling";
case FOLLOWING:
return "following";
case PRECEDING:
return "preceding";
case ATTRIBUTE:
return "attribute";
case NAMESPACE:
return "namespace";
case SELF:
return "self";
case DESCENDANT_OR_SELF:
return "descendant-or-self";
case ANCESTOR_OR_SELF:
return "ancestor-or-self";
}
throw new JaxenRuntimeException("Illegal Axis Number");
}
/**
* <p>
* Returns the code for an axis given its name.
* </p>
*
* @param axisName the name of the axis: child, parent, descendant, descendant-or-self, etc.
* @return the axis code
*/
public static int lookup(String axisName)
{
// XXX All these equals calls are a small HotSpot;
// Need to replace this with a static HashMap
if ( "child".equals( axisName ) )
{
return CHILD;
}
if ( "descendant".equals( axisName ) )
{
return DESCENDANT;
}
if ( "parent".equals( axisName ) )
{
return PARENT;
}
if ( "ancestor".equals( axisName ) )
{
return ANCESTOR;
}
if ( "following-sibling".equals( axisName ) )
{
return FOLLOWING_SIBLING;
}
if ( "preceding-sibling".equals( axisName ) )
{
return PRECEDING_SIBLING;
}
if ( "following".equals( axisName ) )
{
return FOLLOWING;
}
if ( "preceding".equals( axisName ) )
{
return PRECEDING;
}
if ( "attribute".equals( axisName ) )
{
return ATTRIBUTE;
}
if ( "namespace".equals( axisName ) )
{
return NAMESPACE;
}
if ( "self".equals( axisName ) )
{
return SELF;
}
if ( "descendant-or-self".equals( axisName ) )
{
return DESCENDANT_OR_SELF;
}
if ( "ancestor-or-self".equals( axisName ) )
{
return ANCESTOR_OR_SELF;
}
return INVALID_AXIS;
}
}