libjava/classpath/gnu/xml/transform/ForEachNode.java

   1 /* ForEachNode.java --
   2    Copyright (C) 2004,2006 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package gnu.xml.transform;
  39
  40 import gnu.java.lang.CPStringBuilder;
  41
  42 import java.util.ArrayList;
  43 import java.util.Collection;
  44 import java.util.Collections;
  45 import java.util.Iterator;
  46 import java.util.List;
  47 import javax.xml.namespace.QName;
  48 import javax.xml.transform.TransformerException;
  49 import org.w3c.dom.Node;
  50 import gnu.xml.xpath.Expr;
  51
  52 /**
  53  * A template node representing an XSLT <code>for-each</code> instruction.
  54  *
  55  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  56  */
  57 final class ForEachNode
  58   extends TemplateNode
  59 {
  60
  61   final Expr select;
  62   final List<SortKey> sortKeys;
  63
  64   ForEachNode(Expr select, List<SortKey> sortKeys)
  65   {
  66     this.select = select;
  67     this.sortKeys = sortKeys;
  68   }
  69
  70   TemplateNode clone(Stylesheet stylesheet)
  71   {
  72     int len = sortKeys.size();
  73     List<SortKey> sortKeys2 = new ArrayList<SortKey>(len);
  74     for (int i = 0; i < len; i++)
  75       sortKeys2.add(sortKeys.get(i).clone(stylesheet));
  76     TemplateNode ret = new ForEachNode(select.clone(stylesheet),
  77                                        sortKeys2);
  78     if (children != null)
  79       ret.children = children.clone(stylesheet);
  80     if (next != null)
  81       ret.next = next.clone(stylesheet);
  82     return ret;
  83   }
  84
  85   @Override
  86   void doApply(Stylesheet stylesheet, QName mode,
  87              Node context, int pos, int len,
  88              Node parent, Node nextSibling)
  89     throws TransformerException
  90   {
  91     if (children != null)
  92       {
  93         // Set current template to null
  94         Template saved = stylesheet.currentTemplate;
  95         stylesheet.currentTemplate = null;
  96         Object ret = select.evaluate(context, pos, len);
  97         //System.err.println(toString() + ": " + context+" -> "+ret);
  98         if (ret instanceof Collection)
  99           {
 100             /* Suppression is safe, as we know context produces Collection<Node> */
 101             @SuppressWarnings("unchecked")
 102               Collection<Node> ns = (Collection<Node>) ret;
 103             List<Node> list = new ArrayList<Node>(ns);
 104             if (!sortKeys.isEmpty())
 105               {
 106                 for (SortKey sortKey : sortKeys)
 107                   {
 108                     sortKey.init(stylesheet, mode, context, pos, len, parent,
 109                                  nextSibling);
 110                   }
 111                 Collections.sort(list, new XSLComparator(sortKeys));
 112               }
 113             else
 114               Collections.sort(list, documentOrderComparator);
 115             // Perform children for each node
 116             int l = list.size();
 117             int p = 1;
 118             for (Node node : list)
 119               {
 120                 stylesheet.current = node;
 121                 children.apply(stylesheet, mode,
 122                                node, p++, l,
 123                                parent, nextSibling);
 124               }
 125           }
 126         // Restore current template
 127         stylesheet.currentTemplate = saved;
 128       }
 129     if (next != null)
 130       next.apply(stylesheet, mode,
 131                  context, pos, len,
 132                  parent, nextSibling);
 133   }
 134
 135   @Override
 136   public boolean references(QName var)
 137   {
 138     if (select != null && select.references(var))
 139       return true;
 140     for (Iterator<SortKey> i = sortKeys.iterator(); i.hasNext(); )
 141       {
 142         if (i.next().references(var))
 143           return true;
 144       }
 145     return super.references(var);
 146   }
 147
 148   @Override
 149   public String toString()
 150   {
 151     CPStringBuilder buf = new CPStringBuilder("for-each");
 152     buf.append('[');
 153     buf.append("select=");
 154     buf.append(select);
 155     buf.append(']');
 156     return buf.toString();
 157   }
 158
 159 }