- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xalan" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, Lotus
- * Development Corporation., http://www.lotus.com. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.xml.utils;
-
- import org.w3c.dom.Node;
- import org.w3c.dom.NamedNodeMap;
-
- /**
- * <meta name="usage" content="general"/>
- * This class implements a generic PrefixResolver that
- * can be used to perform prefix-to-namespace lookup
- * for the XPath object.
- */
- public class PrefixResolverDefault implements PrefixResolver
- {
-
- /**
- * The context to resolve the prefix from, if the context
- * is not given.
- */
- Node m_context;
-
- /**
- * The URI for the XML namespace.
- * (Duplicate of that found in org.apache.xpath.XPathContext).
- */
- public static final String S_XMLNAMESPACEURI =
- "http://www.w3.org/XML/1998/namespace";
-
- /**
- * Construct a PrefixResolverDefault object.
- * @param xpathExpressionContext The context from
- * which XPath expression prefixes will be resolved.
- * Warning: This will not work correctly if xpathExpressionContext
- * is an attribute node.
- * @param xpathExpressionContext Node from which to start searching for a
- * xmlns attribute that binds a prefix to a namespace (when the namespace
- * context is not specified in the getNamespaceForPrefix call).
- */
- public PrefixResolverDefault(Node xpathExpressionContext)
- {
- m_context = xpathExpressionContext;
- }
-
- /**
- * Given a namespace, get the corrisponding prefix. This assumes that
- * the PrevixResolver hold's it's own namespace context, or is a namespace
- * context itself.
- * @param prefix Prefix to resolve.
- * @return Namespace that prefix resolves to, or null if prefix
- * is not bound.
- */
- public String getNamespaceForPrefix(String prefix)
- {
- return getNamespaceForPrefix(prefix, m_context);
- }
-
- /**
- * Given a namespace, get the corrisponding prefix.
- * Warning: This will not work correctly if namespaceContext
- * is an attribute node.
- * @param prefix Prefix to resolve.
- * @param namespaceContext Node from which to start searching for a
- * xmlns attribute that binds a prefix to a namespace.
- * @return Namespace that prefix resolves to, or null if prefix
- * is not bound.
- */
- public String getNamespaceForPrefix(String prefix,
- org.w3c.dom.Node namespaceContext)
- {
-
- Node parent = namespaceContext;
- String namespace = null;
-
- if (prefix.equals("xml"))
- {
- namespace = S_XMLNAMESPACEURI;
- }
- else
- {
- int type;
-
- while ((null != parent) && (null == namespace)
- && (((type = parent.getNodeType()) == Node.ELEMENT_NODE)
- || (type == Node.ENTITY_REFERENCE_NODE)))
- {
- if (type == Node.ELEMENT_NODE)
- {
- NamedNodeMap nnm = parent.getAttributes();
-
- for (int i = 0; i < nnm.getLength(); i++)
- {
- Node attr = nnm.item(i);
- String aname = attr.getNodeName();
- boolean isPrefix = aname.startsWith("xmlns:");
-
- if (isPrefix || aname.equals("xmlns"))
- {
- int index = aname.indexOf(':');
- String p = isPrefix ? aname.substring(index + 1) : "";
-
- if (p.equals(prefix))
- {
- namespace = attr.getNodeValue();
-
- break;
- }
- }
- }
- }
-
- parent = parent.getParentNode();
- }
- }
-
- return namespace;
- }
-
- /**
- * Return the base identifier.
- *
- * @return null
- */
- public String getBaseIdentifier()
- {
- return null;
- }
- /**
- * @see PrefixResolver#handlesNullPrefixes()
- */
- public boolean handlesNullPrefixes() {
- return false;
- }
-
- }