1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.ws.commons.schema.utils;
21
22 import org.apache.ws.commons.schema.constants.Constants;
23 import org.w3c.dom.NamedNodeMap;
24 import org.w3c.dom.Node;
25
26 /**
27 * Searches for namespace prefix declarations.
28 */
29 public abstract class PrefixCollector {
30 /**
31 * Records a single namespace prefix declaration.
32 */
33 protected abstract void declare(String pPrefix, String pNamespaceURI);
34
35 /**
36 * Searches for namespace prefix declarations in the given node.
37 * For any prefix declaration, it invokes {@link #declare(String, String)}.
38 * This method doesn't work recursively: The parent nodes prefix
39 * declarations are ignored.
40 */
41 public void searchLocalPrefixDeclarations(Node pNode) {
42 short type = pNode.getNodeType();
43 if (type == Node.ELEMENT_NODE || type == Node.DOCUMENT_NODE) {
44 NamedNodeMap map = pNode.getAttributes();
45 for (int i = 0; map != null && i < map.getLength(); i++) {
46 Node attr = map.item(i);
47 final String uri = attr.getNamespaceURI();
48 if (Constants.XMLNS_ATTRIBUTE_NS_URI.equals(uri)) {
49 String localName = attr.getLocalName();
50 String prefix = Constants.XMLNS_ATTRIBUTE.equals(localName) ? Constants.DEFAULT_NS_PREFIX : localName;
51 declare(prefix, attr.getNodeValue());
52 }
53 }
54 }
55 }
56
57 /**
58 * Searches for namespace prefix declarations in the given node.
59 * For any prefix declaration, it invokes {@link #declare(String, String)}.
60 * This method works recursively: The parent nodes prefix
61 * declarations are collected before the current nodes.
62 */
63 public void searchAllPrefixDeclarations(Node pNode) {
64 Node parent = pNode.getParentNode();
65 if (parent != null) {
66 searchAllPrefixDeclarations(parent);
67 }
68 searchLocalPrefixDeclarations(pNode);
69 }
70 }