Initial revision

From-SVN: r102074

1 files changed, 147 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/xml/dom/DomXPathExpression.java b/libjava/classpath/gnu/xml/dom/DomXPathExpression.java
new file mode 100644
index 0000000..2518752
--- /dev/null
+++ b/libjava/classpath/gnu/xml/dom/DomXPathExpression.java
@@ -0,0 +1,147 @@
+/* DomXPathExpression.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.dom;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import javax.xml.namespace.QName;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+import org.w3c.dom.DOMException;
+import org.w3c.dom.Node;
+import org.w3c.dom.xpath.XPathException;
+import org.w3c.dom.xpath.XPathNSResolver;
+import org.w3c.dom.xpath.XPathResult;
+import gnu.xml.xpath.DocumentOrderComparator;
+
+/**
+ * An XPath expression.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+class DomXPathExpression
+implements org.w3c.dom.xpath.XPathExpression
+{
+
+  final DomDocument doc;
+  final XPathExpression expression;
+  final XPathNSResolver resolver;
+
+  DomXPathExpression(DomDocument doc, String expression,
+                     XPathNSResolver resolver)
+    throws XPathException
+  {
+    this.doc = doc;
+    this.resolver = resolver;
+    
+		XPathFactory factory = XPathFactory.newInstance();
+		XPath xpath = factory.newXPath();
+		if (resolver != null)
+		  {
+				xpath.setNamespaceContext(new DomNSResolverContext(resolver));
+	 	  }
+    try
+      {
+        this.expression = xpath.compile(expression);
+      }
+    catch (XPathExpressionException e)
+      {
+        throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,
+						                     e.getMessage ());
+      }
+  }
+
+  public Object evaluate(Node contextNode, short type, Object result)
+    throws XPathException, DOMException
+  {
+		try
+		  {
+				QName typeName = null;
+				switch (type)
+				  {
+						case XPathResult.BOOLEAN_TYPE:
+							typeName = XPathConstants.BOOLEAN;
+							break;
+						case XPathResult.NUMBER_TYPE:
+							typeName = XPathConstants.NUMBER;
+							break;
+						case XPathResult.STRING_TYPE:
+							typeName = XPathConstants.STRING;
+							break;
+						case XPathResult.ANY_UNORDERED_NODE_TYPE:
+						case XPathResult.FIRST_ORDERED_NODE_TYPE:
+							typeName = XPathConstants.NODE;
+							break;
+						case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
+						case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE:
+						case XPathResult.ORDERED_NODE_ITERATOR_TYPE:
+						case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE:
+							typeName = XPathConstants.NODESET;
+							break;
+						default:
+							throw new XPathException(XPathException.TYPE_ERR, null);
+					}
+				Object val = expression.evaluate(contextNode, typeName);
+				switch (type)
+				  {
+						case XPathResult.ORDERED_NODE_ITERATOR_TYPE:
+						case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE:
+							// Sort the nodes
+							List ns = new ArrayList((Collection) val);
+							Collections.sort(ns, new DocumentOrderComparator());
+							val = ns;
+					}
+				return new DomXPathResult(val, type);
+			}
+		catch (javax.xml.xpath.XPathException e)
+		  {
+				throw new XPathException(XPathException.TYPE_ERR, e.getMessage());
+			}
+  }
+
+  public String toString ()
+  {
+    return getClass ().getName () + "[expression=" + expression + "]";
+  }
+  
+}