1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.jxpath.util;
18
19 import org.apache.commons.jxpath.BasicNodeSet;
20 import org.apache.commons.jxpath.ExtendedKeyManager;
21 import org.apache.commons.jxpath.JXPathContext;
22 import org.apache.commons.jxpath.KeyManager;
23 import org.apache.commons.jxpath.NodeSet;
24 import org.apache.commons.jxpath.Pointer;
25 import org.apache.commons.jxpath.ri.InfoSetUtil;
26
27 /**
28 * Utility class.
29 *
30 * @author Matt Benson
31 * @since JXPath 1.3
32 * @version $Revision: 652845 $ $Date: 2008-05-02 13:46:46 -0400 (Fri, 02 May 2008) $
33 */
34 public class KeyManagerUtils {
35 /**
36 * Adapt KeyManager to implement ExtendedKeyManager.
37 */
38 private static class SingleNodeExtendedKeyManager implements
39 ExtendedKeyManager {
40 private KeyManager delegate;
41
42 /**
43 * Create a new SingleNodeExtendedKeyManager.
44 * @param delegate KeyManager to wrap
45 */
46 public SingleNodeExtendedKeyManager(KeyManager delegate) {
47 this.delegate = delegate;
48 }
49
50 public NodeSet getNodeSetByKey(JXPathContext context, String key,
51 Object value) {
52 Pointer pointer = delegate.getPointerByKey(context, key, InfoSetUtil.stringValue(value));
53 BasicNodeSet result = new BasicNodeSet();
54 result.add(pointer);
55 return result;
56 }
57
58 public Pointer getPointerByKey(JXPathContext context, String keyName,
59 String keyValue) {
60 return delegate.getPointerByKey(context, keyName, keyValue);
61 }
62 }
63
64 /**
65 * Get an ExtendedKeyManager from the specified KeyManager.
66 * @param keyManager to adapt, if necessary
67 * @return <code>keyManager</code> if it implements ExtendedKeyManager
68 * or a basic single-result ExtendedKeyManager that delegates to
69 * <code>keyManager</code>.
70 */
71 public static ExtendedKeyManager getExtendedKeyManager(KeyManager keyManager) {
72 return keyManager instanceof ExtendedKeyManager ? (ExtendedKeyManager) keyManager
73 : new SingleNodeExtendedKeyManager(keyManager);
74 }
75 }