228 lines
6.0 KiB
Java
228 lines
6.0 KiB
Java
/* DomHTMLCollection.java --
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.dom.html2;
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import gnu.xml.dom.DomDOMException;
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import gnu.xml.dom.DomElement;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import org.w3c.dom.DOMException;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.html2.HTMLCollection;
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import org.w3c.dom.html2.HTMLOptionsCollection;
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import org.w3c.dom.traversal.NodeFilter;
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import org.w3c.dom.traversal.NodeIterator;
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/**
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* An HTML element collection.
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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class DomHTMLCollection
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implements HTMLCollection, HTMLOptionsCollection, NodeList, NodeFilter
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{
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final DomHTMLDocument doc;
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final Node root;
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List nodeNames;
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List attributeNames;
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List results;
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DomHTMLCollection(DomHTMLDocument doc, Node root)
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{
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this.doc = doc;
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this.root = root;
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}
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// -- Node name and attribute filtering --
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void addNodeName(String name)
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{
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if (nodeNames == null)
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{
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nodeNames = new LinkedList();
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}
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nodeNames.add(name);
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}
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void addAttributeName(String name)
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{
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if (attributeNames == null)
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{
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attributeNames = new LinkedList();
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}
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attributeNames.add(name);
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}
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public short acceptNode(Node n)
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{
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if (n.getNodeType() != Node.ELEMENT_NODE)
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{
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return NodeFilter.FILTER_SKIP;
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}
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String localName = n.getLocalName();
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if (localName == null)
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{
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localName = n.getNodeName();
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}
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if (nodeNames != null && !acceptName(localName))
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{
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return NodeFilter.FILTER_SKIP;
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}
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if (attributeNames != null && !acceptAttributes(n.getAttributes()))
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{
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return NodeFilter.FILTER_SKIP;
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}
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return NodeFilter.FILTER_ACCEPT;
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}
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private boolean acceptName(String name)
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{
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for (Iterator i = nodeNames.iterator(); i.hasNext(); )
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{
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String nodeName = (String) i.next();
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if (nodeName.equalsIgnoreCase(name))
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{
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return true;
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}
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}
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return false;
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}
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private boolean acceptAttributes(NamedNodeMap attrs)
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{
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for (Iterator i = attributeNames.iterator(); i.hasNext(); )
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{
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String attributeName = (String) i.next();
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Node attr = getNamedItem(attrs, attributeName);
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if (attr != null)
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{
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// Check that attribute has a non-null value
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String nodeValue = attr.getNodeValue();
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if (nodeValue != null && nodeValue.length() > 0)
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{
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Case-insensitive version of getNamedItem.
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*/
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private Node getNamedItem(NamedNodeMap attrs, String name)
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{
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int len = attrs.getLength();
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for (int i = 0; i < len; i++)
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{
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Node attr = attrs.item(i);
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String attrName = attr.getLocalName();
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if (attrName == null)
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{
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attrName = attr.getNodeName();
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}
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if (name.equalsIgnoreCase(attrName))
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{
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return attr;
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}
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}
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return null;
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}
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// -- Perform query --
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void evaluate()
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{
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NodeIterator i = doc.createNodeIterator(root, NodeFilter.SHOW_ELEMENT,
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this, true);
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results = new ArrayList();
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for (Node node = i.nextNode(); node != null; node = i.nextNode())
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{
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results.add(node);
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}
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}
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// -- HTMLCollection/NodeList interface --
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public int getLength()
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{
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return results.size();
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}
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public void setLength(int length)
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{
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throw new DomDOMException(DOMException.NOT_SUPPORTED_ERR);
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}
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public Node item(int index)
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{
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return (Node) results.get(index);
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}
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public Node namedItem(String name)
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{
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boolean xhtml = false; // FIXME detect XHTML document
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for (Iterator i = results.iterator(); i.hasNext(); )
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{
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Node node = (Node) i.next();
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NamedNodeMap attrs = node.getAttributes();
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Node attr = getNamedItem(attrs, "id");
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if (name.equals(attr.getTextContent()))
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{
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return node;
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}
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if (!xhtml)
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{
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attr = getNamedItem(attrs, "name");
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if (name.equals(attr.getTextContent()))
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{
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return node;
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}
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}
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}
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return null;
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}
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}
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