| /* |
| * 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. |
| * |
| */ |
| |
| package org.apache.vysper.xml.fragment; |
| |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Stack; |
| import java.util.Map.Entry; |
| |
| |
| /** |
| * Naive implementation, will be replaced in later stages of this change |
| */ |
| public class ResolverNamespaceResolver { |
| |
| private Stack<XMLElement> elements = new Stack<XMLElement>(); |
| |
| public ResolverNamespaceResolver() { |
| } |
| |
| public void push(XMLElement elm) { |
| elements.push(elm); |
| } |
| |
| public void pop() { |
| elements.pop(); |
| } |
| |
| public Map<String, String> getNamespaceDeclarations() { |
| Map<String, String> ns = new LinkedHashMap<String, String>(); |
| if(!elements.isEmpty()) { |
| XMLElement topElm = elements.peek(); |
| for(Entry<String, String> entry : topElm.getDeclaredNamespaces().entrySet()) { |
| ns.put(entry.getKey(), entry.getValue()); |
| } |
| |
| // look for any generated prefixes for attributes |
| for(Attribute attribute : topElm.getAttributes()) { |
| String attrNs = attribute.getNamespaceUri(); |
| if(attrNs.length() > 0 && resolvePrefix(attrNs, false) == null) { |
| // attribute is in a namespace, and that namespace is not declared |
| ns.put(resolvePrefix(attrNs), attrNs); |
| } |
| } |
| |
| |
| // add the element declaration as well, if not already defined |
| if(topElm.getNamespaceURI().length() > 0) { |
| // declared in a namespace |
| if(!ns.containsValue(topElm.getNamespaceURI())) { |
| // the namespace is not declared as an attribute on topElm |
| // is it declared on a parent? |
| // pop the element to test for declaration on the parent |
| pop(); |
| if(resolvePrefix(topElm.getNamespaceURI(), false) == null) { |
| ns.put(topElm.getNamespacePrefix(), topElm.getNamespaceURI()); |
| } |
| // restore stack |
| push(topElm); |
| } |
| } else { |
| // is there a parent in a namespace? if so, we need to reset the default namespace |
| if(elements.size() > 1 |
| && elements.get(elements.size() - 2).getNamespaceURI().length() > 0 |
| && !ns.containsKey("")) { |
| ns.put("", ""); |
| } |
| } |
| } |
| |
| return ns; |
| } |
| |
| public String resolveUri(String prefix) { |
| // check for the reserved xml namespace |
| if(prefix.equals("xml")) { |
| return Namespaces.XML; |
| } else { |
| for(int i = elements.size() - 1; i>=0; i--) { |
| String uri = resolveUri(elements.get(i), prefix); |
| if(uri != null) { |
| return uri; |
| } |
| } |
| } |
| |
| // is the current element declared with this prefix, |
| // if so, return the declared namespace |
| if(!elements.isEmpty() && prefix.equals(elements.peek().getNamespacePrefix())) { |
| // the namespace URI must not be defined for another prefix |
| String uri = elements.peek().getNamespaceURI(); |
| String resolvedPrefix = resolvePrefix(uri, false); |
| if(resolvedPrefix == null || resolvedPrefix.equals(prefix)) { |
| return uri; |
| } |
| } |
| |
| // could not resolve URI |
| return null; |
| } |
| |
| private String resolveUri(XMLElement elm, String prefix) { |
| return elm.getDeclaredNamespaces().get(prefix); |
| } |
| |
| public String resolvePrefix(String uri) { |
| return resolvePrefix(uri, true); |
| } |
| |
| private String resolvePrefix(String uri, boolean generatePrefix) { |
| // check for the reserved xml namespace |
| if(uri.equals(Namespaces.XML)) { |
| return "xml"; |
| } else { |
| for(int i = elements.size() - 1; i>=0; i--) { |
| String prefix = resolvePrefix(elements.get(i), uri); |
| if(prefix != null) { |
| return prefix; |
| } |
| } |
| } |
| |
| // is the current element in this namespace, if so, return the default prefix |
| if(!elements.isEmpty() && uri.equals(elements.peek().getNamespaceURI())) { |
| return elements.peek().getNamespacePrefix(); |
| } |
| |
| if(generatePrefix) { |
| // TODO replace with prefix generation |
| return "ns1"; |
| } else { |
| return null; |
| } |
| |
| } |
| |
| private String resolvePrefix(XMLElement elm, String uri) { |
| for(Entry<String, String> entry : elm.getDeclaredNamespaces().entrySet()) { |
| if(entry.getValue().equals(uri)) { |
| return entry.getKey(); |
| } |
| } |
| |
| return null; |
| } |
| } |