/*******************************************************************************
 * Copyright (c) 2006 Oracle Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Oracle Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.bpel.xpath10;

/**
 * 
 * @author Michal Chmielewski (michal.chmielewski@oracle.com)
 * @date Aug 26, 2008
 *
 */
@SuppressWarnings("nls")

public class Axis {
	
	/** */
	static final public int INVALID_AXIS       = 0;
	
	/** Child axis */
	static final public int CHILD              = 1;
	
	/** Descendant axis */
	static final public int DESCENDANT         = 2;
	
	/** Parent axis */
	static final public int PARENT             = 3;
	
	/** Ancestor axis */
	static final public int ANCESTOR           = 4;
	
	/** Following sibling axis */
	static final public int FOLLOWING_SIBLING  = 5;
	
	/** Proceeding sibling axis */
	static final public int PRECEDING_SIBLING  = 6;
		
	/** Following axis */
	static final public int FOLLOWING          = 7;
	
	/** Preceeding sibling axis */
	static final public int PRECEDING          = 8;
	
	/** Attribute axis */
	static final public int ATTRIBUTE          = 9;
	
	/** Namespace axis */
	static final public int NAMESPACE          = 10;
	
	/** Self axis */
	static final public int SELF               = 11;
	
	/** Descendant or self axis */
	static final public int DESCENDANT_OR_SELF = 12;
	
	/** Ancestor or self [ lucky 13 ] */
	static final public int ANCESTOR_OR_SELF   = 13;
	
	
	static final private String [] NAMES = { 
		
		"unknown-axis-name",   /** at [0] we have null */
		
		"child",
		"descendant",
		"parent",
		"ancestor",
		"following-sibling",
		"preceding-sibling",
		"following",
		"preceding",
		"attribute",
		"namespace",
		"self",
		"descendant-or-self",
		"ancestor-or-self"
	};
	
	/**
	 * Get the name of the axis given it's index (retrieved via {{@link #getAxis(String)} below.
	 *  
	 * @param axis
	 * @return the axis name
	 */
	static public String getName (int axis) {
		if (axis < 1 || axis >= NAMES.length) {
			return NAMES[0];
		}
		return NAMES[axis];
	}
	
	/**
	 * 
	 * @param axisName the axis name
	 * @return the axis id given its name
	 */
	
	static public int getAxis ( String axisName ) {
		for(int i=1; i<NAMES.length; i++) {
			if (NAMES[i].equals(axisName)) {
				return i;
			}
		}
		return -1;
	}
	
}