Initial revision

From-SVN: r102074

libjava/classpath/gnu/xml/dom/html2/DomHTMLCollection.java

@@ -0,0 +1,227 @@
+/* DomHTMLCollection.java -- 
+   Copyright (C) 2005 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.html2;
+
+import gnu.xml.dom.DomDOMException;
+import gnu.xml.dom.DomElement;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import org.w3c.dom.DOMException;
+import org.w3c.dom.NamedNodeMap;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.w3c.dom.html2.HTMLCollection;
+import org.w3c.dom.html2.HTMLOptionsCollection;
+import org.w3c.dom.traversal.NodeFilter;
+import org.w3c.dom.traversal.NodeIterator;
+
+/**
+ * An HTML element collection.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+class DomHTMLCollection
+  implements HTMLCollection, HTMLOptionsCollection, NodeList, NodeFilter
+{
+
+  final DomHTMLDocument doc;
+  final Node root;
+  List nodeNames;
+  List attributeNames;
+  List results;
+
+  DomHTMLCollection(DomHTMLDocument doc, Node root)
+  {
+    this.doc = doc;
+    this.root = root;
+  }
+
+  // -- Node name and attribute filtering --
+
+  void addNodeName(String name)
+  {
+    if (nodeNames == null)
+      {
+        nodeNames = new LinkedList();
+      }
+    nodeNames.add(name);
+  }
+
+  void addAttributeName(String name)
+  {
+    if (attributeNames == null)
+      {
+        attributeNames = new LinkedList();
+      }
+    attributeNames.add(name);
+  }
+
+  public short acceptNode(Node n)
+  {
+    if (n.getNodeType() != Node.ELEMENT_NODE)
+      {
+        return NodeFilter.FILTER_SKIP;
+      }
+    String localName = n.getLocalName();
+    if (localName == null)
+      {
+        localName = n.getNodeName();
+      }
+    if (nodeNames != null && !acceptName(localName))
+      {
+        return NodeFilter.FILTER_SKIP;
+      }
+    if (attributeNames != null && !acceptAttributes(n.getAttributes()))
+      {
+        return NodeFilter.FILTER_SKIP;
+      }
+    return NodeFilter.FILTER_ACCEPT;
+  }
+
+  private boolean acceptName(String name)
+  {
+    for (Iterator i = nodeNames.iterator(); i.hasNext(); )
+      {
+        String nodeName = (String) i.next();
+        if (nodeName.equalsIgnoreCase(name))
+          {
+            return true;
+          }
+      }
+    return false;
+  }
+
+  private boolean acceptAttributes(NamedNodeMap attrs)
+  {
+    for (Iterator i = attributeNames.iterator(); i.hasNext(); )
+      {
+        String attributeName = (String) i.next();
+        Node attr = getNamedItem(attrs, attributeName);
+        if (attr != null)
+          {
+            // Check that attribute has a non-null value
+            String nodeValue = attr.getNodeValue();
+            if (nodeValue != null && nodeValue.length() > 0)
+              {
+                return true;
+              }
+          }
+      }
+    return false;
+  }
+
+  /**
+   * Case-insensitive version of getNamedItem.
+   */
+  private Node getNamedItem(NamedNodeMap attrs, String name)
+  {
+    int len = attrs.getLength();
+    for (int i = 0; i < len; i++)
+      {
+        Node attr = attrs.item(i);
+        String attrName = attr.getLocalName();
+        if (attrName == null)
+          {
+            attrName = attr.getNodeName();
+          }
+        if (name.equalsIgnoreCase(attrName))
+          {
+            return attr;
+          }
+      }
+    return null;
+  }
+
+  // -- Perform query --
+
+  void evaluate()
+  {
+    NodeIterator i = doc.createNodeIterator(root, NodeFilter.SHOW_ELEMENT,
+                                            this, true);
+    results = new ArrayList();
+    for (Node node = i.nextNode(); node != null; node = i.nextNode())
+      {
+        results.add(node);
+      }
+  }
+
+  // -- HTMLCollection/NodeList interface --
+
+  public int getLength()
+  {
+    return results.size();
+  }
+
+  public void setLength(int length)
+  {
+    throw new DomDOMException(DOMException.NOT_SUPPORTED_ERR);
+  }
+
+  public Node item(int index)
+  {
+    return (Node) results.get(index);
+  }
+
+  public Node namedItem(String name)
+  {
+    boolean xhtml = false; // FIXME detect XHTML document
+    for (Iterator i = results.iterator(); i.hasNext(); )
+      {
+        Node node = (Node) i.next();
+        NamedNodeMap attrs = node.getAttributes();
+        Node attr = getNamedItem(attrs, "id");
+        if (name.equals(attr.getTextContent()))
+          {
+            return node;
+          }
+        if (!xhtml)
+          {
+            attr = getNamedItem(attrs, "name");
+            if (name.equals(attr.getTextContent()))
+              {
+                return node;
+              }
+          }
+      }
+    return null;
+  }
+  
+}
+