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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/function/NameFunction.java,v 1.11 2006/02/05 21:47:41 elharo Exp $
 * $Revision: 1.11 $
 * $Date: 2006/02/05 21:47:41 $
 *
 * ====================================================================
 *
 * 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: NameFunction.java,v 1.11 2006/02/05 21:47:41 elharo Exp $
 */


package org.navimatrix.jaxen.function;

import java.util.List;

import org.navimatrix.jaxen.Context;
import org.navimatrix.jaxen.Function;
import org.navimatrix.jaxen.FunctionCallException;
import org.navimatrix.jaxen.Navigator;

/**
 * 

4.1 string name(node-set?)

* * *
* The name function returns a string containing a QName representing * the expanded-name of the node in the argument node-set that is first in document order. * The QName must represent the expanded-name with respect to the namespace declarations * in effect on the node whose expanded-name is being represented. Typically, this will * be the QName that occurred in the XML source....If * the argument node-set is empty or the first node has * no expanded-name, an empty string is returned. * If the argument it omitted, it defaults to a node-set with the context node as its only member. *
* * @author bob mcwhirter (bob @ werken.com) * * @see Section 4.1 of the XPath Specification */ public class NameFunction implements Function { /** * Create a new NameFunction object. */ public NameFunction() {} /** * Returns the name of the specified node or the name of the context node if * no arguments are provided. * * @param context the context at the point in the * expression where the function is called * @param args a List containing zero or one items * * @return a String containing the name * * @throws FunctionCallException if args has more than one item */ public Object call(Context context, List args) throws FunctionCallException { if ( args.size() == 0 ) { return evaluate( context.getNodeSet(), context.getNavigator() ); } if ( args.size() == 1 ) { return evaluate( args, context.getNavigator() ); } throw new FunctionCallException( "name() requires zero or one argument." ); } /** * Returns the name of list.get(0) * * @param list a list of nodes * @param nav the Navigator used to retrieve the name * * @return the name of list.get(0) * * @throws FunctionCallException if list.get(0) is not a node */ public static String evaluate(List list, Navigator nav) throws FunctionCallException { if ( ! list.isEmpty() ) { Object first = list.get(0); if (first instanceof List) { return evaluate( (List) first, nav ); } else if ( nav.isElement( first ) ) { return nav.getElementQName( first ); } else if ( nav.isAttribute( first ) ) { return nav.getAttributeQName( first ); } else if ( nav.isProcessingInstruction( first ) ) { return nav.getProcessingInstructionTarget( first ); } else if ( nav.isNamespace( first ) ) { return nav.getNamespacePrefix( first ); } else if ( nav.isDocument( first ) ) { return ""; } else if ( nav.isComment( first ) ) { return ""; } else if ( nav.isText( first ) ) { return ""; } else { throw new FunctionCallException("The argument to the name function must be a node-set"); } } return ""; } }




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