Subversion Repositories openrisc

/* KeyFunction.java --

   Copyright (C) 2004 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.transform;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.Iterator;

import java.util.LinkedHashSet;

import java.util.LinkedList;

import java.util.List;

import javax.xml.namespace.QName;

import javax.xml.xpath.XPathFunction;

import javax.xml.xpath.XPathFunctionException;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

import gnu.xml.xpath.Expr;

import gnu.xml.xpath.Function;

import gnu.xml.xpath.Pattern;

/**

 * The XSLT <code>key()</code>function.

 *

 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>

 */

final class KeyFunction

  extends Pattern

  implements XPathFunction, Function

{

  final Stylesheet stylesheet;

  List args;

  KeyFunction(Stylesheet stylesheet)

  {

    this.stylesheet = stylesheet;

  }

  public Object evaluate(List args)

    throws XPathFunctionException

  {

    // Useless...

    return Collections.EMPTY_SET;

  }

  public void setArguments(List args)

  {

    this.args = args;

  }

  public boolean matches(Node context)

  {

    Object ret = evaluate(context, 1, 1);

    return !((Collection) ret).isEmpty();

  }

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

  {

    // Evaluate arguments

    int arity = args.size();

    List values = new ArrayList(arity);

    for (int i = 0; i < arity; i++)

      {

        Expr arg = (Expr) args.get(i);

        values.add(arg.evaluate(context, pos, len));

      }

    // Get key name

    QName keyName = QName.valueOf(_string(context, values.get(0)));

    // Expand qualified name

    String uri = keyName.getNamespaceURI();

    String prefix = keyName.getPrefix();

    if ((uri == null || uri.length() == 0) &&

        (prefix != null && prefix.length() > 0))

      {

        uri = stylesheet.getNamespaceURI(prefix);

        if (uri != null && uri.length() > 0)

          {

            String localName = keyName.getLocalPart();

            keyName = new QName(uri, localName, prefix);

          }

      }

    // Compute matching key set

    Collection keySet = new LinkedList();

    for (Iterator i = stylesheet.keys.iterator(); i.hasNext(); )

      {

        Key key = (Key) i.next();

        if (key.name.equals(keyName))

          {

            keySet.add(key);

          }

      }

    // Get target

    Object target = values.get(1);

    Collection acc = new LinkedHashSet();

    Document doc = (context instanceof Document) ? (Document) context :

      context.getOwnerDocument();

    if (target instanceof Collection)

      {

        for (Iterator i = ((Collection) target).iterator(); i.hasNext(); )

          {

            String val = Expr.stringValue((Node) i.next());

            addKeyNodes(doc, keySet, val, acc);

          }

      }

    else

      {

        String val = Expr._string(context, target);

        addKeyNodes(doc, keySet, val, acc);

      }

    List ret = new ArrayList(acc);

    Collections.sort(ret, documentOrderComparator);

    return ret;

  }

  final void addKeyNodes(Node node, Collection keySet,

                         String value, Collection acc)

  {

    addKeyNodeIfMatch(node, keySet, value, acc);

    // Apply children

    for (Node ctx = node.getFirstChild(); ctx != null;

         ctx = ctx.getNextSibling())

      {

        addKeyNodes(ctx, keySet, value, acc);

      }

  }

  final void addKeyNodeIfMatch(Node node, Collection keySet,

                               String value, Collection acc)

  {

    for (Iterator i = keySet.iterator(); i.hasNext(); )

      {

        Key key = (Key) i.next();

        if (key.match.matches(node))

          {

            Object eval = key.use.evaluate(node, 1, 1);

            if (eval instanceof Collection)

              {

                for (Iterator j = ((Collection) eval).iterator();

                     j.hasNext(); )

                  {

                    String keyValue = Expr.stringValue((Node) j.next());

                    if (value.equals(keyValue))

                      {

                        acc.add(node);

                        return;

                      }

                  }

              }

            else

              {

                String keyValue = Expr._string(node, eval);

                if (value.equals(keyValue))

                  {

                    acc.add(node);

                    return;

                  }

              }

          }

      }

  }

  public Expr clone(Object context)

  {

    Stylesheet s = stylesheet;

    if (context instanceof Stylesheet)

      {

        s = (Stylesheet) context;

      }

    KeyFunction f = new KeyFunction(s);

    int len = args.size();

    List args2 = new ArrayList(len);

    for (int i = 0; i < len; i++)

      {

        args2.add(((Expr) args.get(i)).clone(context));

      }

    f.setArguments(args2);

    return f;

  }

  public boolean references(QName var)

  {

    for (Iterator i = args.iterator(); i.hasNext(); )

      {

        if (((Expr) i.next()).references(var))

          {

            return true;

          }

      }

    return false;

  }

}