| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 468655 2006-10-28 07:12:06Z minchau $ |
| */ |
| package org.apache.xml.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. |
| */ |
| 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; |
| } |
| |
| } |