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

   1 /* ValueOfNode.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 java.util.Collection;
  41 import java.util.Iterator;
  42 import javax.xml.namespace.QName;
  43 import javax.xml.transform.TransformerException;
  44 import org.w3c.dom.Document;
  45 import org.w3c.dom.Node;
  46 import org.w3c.dom.Text;
  47 import gnu.xml.xpath.Expr;
  48
  49 /**
  50  * A template node representing an XSLT <code>value-of</code> instruction.
  51  *
  52  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  53  */
  54 final class ValueOfNode
  55   extends TemplateNode
  56 {
  57
  58   final Expr select;
  59   final boolean disableOutputEscaping;
  60
  61   ValueOfNode(Expr select, boolean disableOutputEscaping)
  62   {
  63     this.select = select;
  64     this.disableOutputEscaping = disableOutputEscaping;
  65   }
  66
  67   TemplateNode clone(Stylesheet stylesheet)
  68   {
  69     TemplateNode ret = new ValueOfNode(select.clone(stylesheet),
  70                                        disableOutputEscaping);
  71     if (children != null)
  72       ret.children = children.clone(stylesheet);
  73     if (next != null)
  74       ret.next = next.clone(stylesheet);
  75     return ret;
  76   }
  77
  78   void doApply(Stylesheet stylesheet, QName mode,
  79                Node context, int pos, int len,
  80                Node parent, Node nextSibling)
  81     throws TransformerException
  82   {
  83     Object ret = select.evaluate(context, pos, len);
  84     String value;
  85     if (ret instanceof Collection)
  86       {
  87         StringBuffer buf = new StringBuffer();
  88         for (Iterator i = ((Collection) ret).iterator(); i.hasNext(); )
  89           {
  90             Node node = (Node) i.next();
  91             buf.append(Expr.stringValue(node));
  92           }
  93         value = buf.toString();
  94       }
  95     else if (ret == null)
  96       value = "";
  97     else
  98       value = Expr._string(context, ret);
  99     if (stylesheet.debug)
 100       System.err.println("value-of: "+context+" "+ select + " -> "+ value);
 101     if (value != null && value.length() > 0)
 102       {
 103         Document doc = (parent instanceof Document) ?
 104           (Document) parent : parent.getOwnerDocument();
 105         Text textNode = doc.createTextNode(value);
 106         if (disableOutputEscaping)
 107           textNode.setUserData("disable-output-escaping", "yes", stylesheet);
 108         if (nextSibling != null)
 109           parent.insertBefore(textNode, nextSibling);
 110         else
 111           parent.appendChild(textNode);
 112       }
 113     // value-of doesn't process children
 114     if (next != null)
 115       next.apply(stylesheet, mode,
 116                  context, pos, len,
 117                  parent, nextSibling);
 118   }
 119
 120   public boolean references(QName var)
 121   {
 122     if (select != null && select.references(var))
 123       return true;
 124     return super.references(var);
 125   }
 126
 127   public String toString()
 128   {
 129     StringBuffer buf = new StringBuffer(getClass().getName());
 130     buf.append('[');
 131     buf.append("select=");
 132     buf.append(select);
 133     if (disableOutputEscaping)
 134       buf.append(",disableOutputEscaping");
 135     buf.append(']');
 136     return buf.toString();
 137   }
 138
 139 }