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/* NameFunction.java --

   Copyright (C) 2004,2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.xml.xpath;

import java.util.Collection;

import java.util.Collections;

import java.util.List;

import javax.xml.namespace.QName;

import org.w3c.dom.Node;

/**

 * The <code>name</code> 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. This need not be the case if there are

 * namespace declarations in effect on the node that associate multiple

 * prefixes with the same namespace. However, an implementation may include

 * information about the original prefix in its representation of nodes; in

 * this case, an implementation can ensure that the returned string is

 * always the same as the QName used 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 <a href='mailto:dog@gnu.org'>Chris Burdess</a>

 */

final class NameFunction

  extends Expr

{

  final Expr arg;

  NameFunction(List<Expr> args)

  {

    this(args.size() > 0 ? args.get(0) : null);

  }

  NameFunction(Expr arg)

  {

    this.arg = arg;

  }

  @Override

  public Object evaluate(Node context, int pos, int len)

  {

    /* Suppression is safe, as we know context produces Collection<Node> */

    @SuppressWarnings("unchecked")

    Collection<Node> val = (arg == null) ? Collections.singleton(context) :

      (Collection<Node>) arg.evaluate(context, pos, len);

    return _name(context, val);

  }

  @Override

  public Expr clone(Object context)

  {

    return new NameFunction((arg == null) ? null :

                            arg.clone(context));

  }

  @Override

  public boolean references(QName var)

  {

    return (arg == null) ? false : arg.references(var);

  }

  @Override

  public String toString()

  {

    return (arg == null) ? "name()" : "name(" + arg + ")";

  }

}