Initial revision

From-SVN: r102074

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

@@ -0,0 +1,198 @@
+/* ParameterNode.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.Collections;
+import javax.xml.namespace.QName;
+import javax.xml.transform.TransformerException;
+import org.w3c.dom.Document;
+import org.w3c.dom.DocumentFragment;
+import org.w3c.dom.Node;
+import gnu.xml.xpath.Expr;
+
+/**
+ * A template node that sets a variable or parameter during template
+ * processing.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+final class ParameterNode
+  extends TemplateNode
+  implements Comparable
+{
+
+  final QName name;
+  final Expr select;
+  final int type;
+
+  ParameterNode(QName name, Expr select, int type)
+  {
+    this.name = name;
+    this.select = select;
+    this.type = type;
+  }
+
+  TemplateNode clone(Stylesheet stylesheet)
+  {
+    TemplateNode ret = new ParameterNode(name,
+                                         select.clone(stylesheet),
+                                         type);
+    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
+  {
+    // push the variable context
+    stylesheet.bindings.push(type);
+    // set the variable
+    Object value = getValue(stylesheet, mode, context, pos, len);
+    if (value != null)
+      {
+        stylesheet.bindings.set(name, value, type);
+        if (stylesheet.debug)
+          {
+            System.err.println(this + ": set to " + value);
+          }
+      }
+    // variable and param don't process children as such
+    // all subsequent instructions are processed with that variable context
+    if (next != null)
+      {
+        next.apply(stylesheet, mode,
+                   context, pos, len,
+                   parent, nextSibling);
+      }
+    // pop the variable context
+    stylesheet.bindings.pop(type);
+  }
+  
+  Object getValue(Stylesheet stylesheet, QName mode,
+                  Node context, int pos, int len)
+    throws TransformerException
+  {
+    if (select != null)
+      {
+        return select.evaluate(context, pos, len);
+      }
+    else if (children != null)
+      {
+        Document doc = (context instanceof Document) ? (Document) context :
+          context.getOwnerDocument();
+        DocumentFragment fragment = doc.createDocumentFragment();
+        children.apply(stylesheet, mode, context, pos, len, fragment, null);
+        return Collections.singleton(fragment);
+      }
+    else
+      {
+        return null;
+      }
+  }
+  
+  public boolean references(QName var)
+  {
+    if (select != null && select.references(var))
+      {
+        return true;
+      }
+    return super.references(var);
+  }
+
+  public int compareTo(Object other)
+  {
+    if (other instanceof ParameterNode)
+      {
+        ParameterNode pn = (ParameterNode) other;
+        boolean r1 = references(pn.name);
+        boolean r2 = pn.references(name);
+        if (r1 && r2)
+          {
+            throw new IllegalArgumentException("circular definitions");
+          }
+        if (r1)
+          {
+            return 1;
+          }
+        if (r2)
+          {
+            return -1;
+          }
+      }
+    return 0;
+  }
+  
+  public String toString()
+  {
+    StringBuffer buf = new StringBuffer(getClass().getName());
+    buf.append('[');
+    buf.append("name=");
+    buf.append(name);
+    if (select != null)
+      {
+        buf.append(",select=");
+        buf.append(select);
+      }
+    buf.append(",type=");
+    switch (type)
+      {
+      case Bindings.VARIABLE:
+        buf.append("variable");
+        break;
+      case Bindings.PARAM:
+        buf.append("param");
+        break;
+      case Bindings.WITH_PARAM:
+        buf.append("with-param");
+        break;
+      }
+    buf.append(']');
+    return buf.toString();
+  }
+
+}
+