| /* |
| * 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.common; |
| |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.util.Set; |
| |
| import org.apache.axiom.om.OMContainer; |
| import org.apache.axiom.om.OMElement; |
| import org.apache.axiom.om.OMNamespace; |
| |
| /** |
| * Iterator implementation used by {@link OMElement#getNamespacesInScope()}. |
| */ |
| public final class NamespaceIterator implements Iterator<OMNamespace> { |
| private final Set<String> seenPrefixes = new HashSet<String>(); |
| private OMElement element; |
| private Iterator<OMNamespace> declaredNamespaces; |
| private boolean hasNextCalled; |
| private OMNamespace next; |
| |
| public NamespaceIterator(OMElement element) { |
| this.element = element; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (!hasNextCalled) { |
| while (true) { |
| if (declaredNamespaces == null) { |
| declaredNamespaces = element.getAllDeclaredNamespaces(); |
| } else if (declaredNamespaces.hasNext()) { |
| OMNamespace namespace = declaredNamespaces.next(); |
| // We only return a namespace declaration if it has not been overridden (i.e. if |
| // we have not seen another declaration with the same prefix yet) and if the namespace |
| // URI is not empty. The second part of the condition covers the case of namespace |
| // declarations such as xmlns="" (for which no OMNamespace object is returned, as |
| // described in the Javadoc of the getNamespacesInScope method) as well as undeclared |
| // prefixes (XML 1.1 only). |
| if (seenPrefixes.add(namespace.getPrefix()) && namespace.getNamespaceURI().length() > 0) { |
| next = namespace; |
| break; |
| } |
| } else { |
| declaredNamespaces = null; |
| OMContainer parent = element.getParent(); |
| if (parent instanceof OMElement) { |
| element = (OMElement)parent; |
| } else { |
| next = null; |
| break; |
| } |
| } |
| } |
| hasNextCalled = true; |
| } |
| return next != null; |
| } |
| |
| @Override |
| public OMNamespace next() { |
| if (hasNext()) { |
| OMNamespace result = next; |
| hasNextCalled = false; |
| next = null; |
| return result; |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| // TODO: document that remove is not supported |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |