Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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+/* VariableReference.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.xpath;
+
+import javax.xml.namespace.QName;
+import javax.xml.xpath.XPathVariableResolver;
+import org.w3c.dom.Node;
+import gnu.xml.transform.Bindings;
+
+public class VariableReference
+  extends Expr
+{
+
+  final XPathVariableResolver resolver;
+  final QName name;
+
+  public VariableReference(XPathVariableResolver resolver, QName name)
+  {
+    this.resolver = resolver;
+    this.name = name;
+  }
+
+  public Object evaluate(Node context, int pos, int len)
+  {
+    if (resolver != null)
+      {
+        if (resolver instanceof Bindings)
+          {
+            // Needs context to operate properly
+            return ((Bindings) resolver).get(name, context, pos, len);
+          }
+        return resolver.resolveVariable(name);
+      }
+    throw new IllegalStateException("no variable resolver");
+  }
+
+  public Expr clone(Object context)
+  {
+    XPathVariableResolver r = resolver;
+    if (context instanceof XPathVariableResolver)
+      {
+        r = (XPathVariableResolver) context;
+      }
+    return new VariableReference(r, name);
+  }
+
+  public boolean references(QName var)
+  {
+    return name.equals(var);
+  }
+
+  public String toString()
+  {
+    StringBuffer buf = new StringBuffer("$");
+    String prefix = name.getPrefix();
+    if (prefix != null && !"".equals(prefix))
+      {
+        buf.append(prefix);
+        buf.append(':');
+      }
+    buf.append(name.getLocalPart());
+    return buf.toString();
+  }
+  
+}