Initial revision

[pf3gnuchains/gcc-fork.git] / libjava / classpath / gnu / xml / transform / WhenNode.java

diff --git a/libjava/classpath/gnu/xml/transform/WhenNode.java b/libjava/classpath/gnu/xml/transform/WhenNode.java
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+/* WhenNode.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 javax.xml.namespace.QName;
+import javax.xml.transform.TransformerException;
+import org.w3c.dom.Node;
+import gnu.xml.xpath.Expr;
+
+/**
+ * A template node representing an XSL <code>when</code> instruction.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+final class WhenNode
+  extends TemplateNode
+{
+
+  final Expr test;
+
+  WhenNode(Expr test)
+  {
+    this.test = test;
+  }
+
+  TemplateNode clone(Stylesheet stylesheet)
+  {
+    TemplateNode ret = new WhenNode(test.clone(stylesheet));
+    if (children != null)
+      {
+        ret.children = children.clone(stylesheet);
+      }
+    if (next != null)
+      {
+        ret.next = next.clone(stylesheet);
+      }
+    return ret;
+  }
+
+  void doApply(Stylesheet stylesheet, QName mode,
+             Node context, int pos, int len,
+             Node parent, Node nextSibling)
+    throws TransformerException
+  {
+    Object ret = test.evaluate(context, pos, len);
+    boolean success = (ret instanceof Boolean) ?
+      ((Boolean) ret).booleanValue() :
+      Expr._boolean(context, ret);
+    if (success)
+      {
+        if (children != null)
+          {
+            children.apply(stylesheet, mode,
+                           context, pos, len,
+                           parent, nextSibling);
+          }
+      }
+    else
+      {
+        if (next != null)
+          {
+            next.apply(stylesheet, mode,
+                       context, pos, len,
+                       parent, nextSibling);
+          }
+      }
+  }
+  
+  public boolean references(QName var)
+  {
+    if (test != null && test.references(var))
+      {
+        return true;
+      }
+    return super.references(var);
+  }
+  
+  public String toString()
+  {
+    StringBuffer buf = new StringBuffer(getClass().getName());
+    buf.append('[');
+    buf.append("test=");
+    buf.append(test);
+    buf.append(']');
+    return buf.toString();
+  }
+  
+}