- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- /*
- * $Id: PrefixResolverDefault.java,v 1.9 2004/02/20 20:32:51 jycli Exp $
- */
- package com.sun.org.apache.xml.internal.utils;
-
- import org.w3c.dom.NamedNodeMap;
- import org.w3c.dom.Node;
-
- /**
- * This class implements a generic PrefixResolver that
- * can be used to perform prefix-to-namespace lookup
- * for the XPath object.
- * @xsl.usage general
- */
- public class PrefixResolverDefault implements PrefixResolver
- {
-
- /**
- * The context to resolve the prefix from, if the context
- * is not given.
- */
- Node m_context;
-
- /**
- * 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 = Constants.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)
- {
- if (parent.getNodeName().indexOf(prefix+":") == 0)
- return parent.getNamespaceURI();
- 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;
- }
-
- }