| /* |
| * 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.axiom.om.impl.stream; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.axiom.core.CoreAttribute; |
| import org.apache.axiom.core.CoreElement; |
| import org.apache.axiom.core.CoreModelException; |
| import org.apache.axiom.core.CoreNamespaceDeclaration; |
| import org.apache.axiom.core.CoreParentNode; |
| import org.apache.axiom.core.stream.StreamException; |
| import org.apache.axiom.core.stream.XmlHandler; |
| import org.apache.axiom.core.stream.XmlHandlerWrapper; |
| |
| public final class NamespaceContextPreservationFilterHandler extends XmlHandlerWrapper { |
| private final CoreElement contextElement; |
| // Maintain a set of the prefixes we have already seen. This is required to take into |
| // account that a namespace mapping declared on an element can hide another one declared |
| // for the same prefix on an ancestor of the element. |
| private Set<String> prefixesAlreadyBound; |
| private boolean done = false; |
| |
| public NamespaceContextPreservationFilterHandler(XmlHandler parent, CoreElement contextElement) { |
| super(parent); |
| this.contextElement = contextElement; |
| } |
| |
| @Override |
| public void startElement(String namespaceURI, String localName, String prefix) throws StreamException { |
| super.startElement(namespaceURI, localName, prefix); |
| if (!done) { |
| prefixesAlreadyBound = new HashSet<String>(); |
| } |
| } |
| |
| @Override |
| public void processNamespaceDeclaration(String prefix, String namespaceURI) throws StreamException { |
| super.processNamespaceDeclaration(prefix, namespaceURI); |
| if (!done) { |
| prefixesAlreadyBound.add(prefix); |
| } |
| } |
| |
| @Override |
| public void attributesCompleted() throws StreamException { |
| if (!done) { |
| try { |
| CoreElement current = contextElement; |
| while (true) { |
| CoreAttribute attr = current.coreGetFirstAttribute(); |
| while (attr != null) { |
| if (attr instanceof CoreNamespaceDeclaration) { |
| CoreNamespaceDeclaration decl = (CoreNamespaceDeclaration)attr; |
| String prefix = decl.coreGetDeclaredPrefix(); |
| if (prefixesAlreadyBound.add(prefix)) { |
| super.processNamespaceDeclaration(prefix, decl.coreGetCharacterData().toString()); |
| } |
| } |
| attr = attr.coreGetNextAttribute(); |
| } |
| CoreParentNode parent = current.coreGetParent(); |
| if (!(parent instanceof CoreElement)) { |
| break; |
| } |
| current = (CoreElement)parent; |
| } |
| prefixesAlreadyBound = null; |
| done = true; |
| } catch (CoreModelException ex) { |
| throw new StreamException(ex); |
| } |
| } |
| super.attributesCompleted(); |
| } |
| } |