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.vfs2.provider.webdav4;
18
19 import java.lang.reflect.Constructor;
20
21 import org.apache.commons.vfs2.FileSystemException;
22 import org.apache.jackrabbit.webdav.DavConstants;
23 import org.apache.jackrabbit.webdav.DavException;
24 import org.apache.jackrabbit.webdav.xml.DomUtil;
25 import org.w3c.dom.Element;
26
27 /**
28 * Converts WebDAV exceptions into FileSystemExceptions.
29 *
30 * @since 2.5.0
31 */
32 public final class ExceptionConverter {
33
34 /**
35 * Generates a new instance of FileSystemException.
36 *
37 * @param cause The cause of the new exception.
38 * @return A new FileSystemException.
39 * @throws FileSystemException If an Exception is caught while generating a new instance.
40 */
41 public static FileSystemException generate(final DavException cause) throws FileSystemException {
42 String msg = cause.getMessage();
43 if (cause.hasErrorCondition()) {
44 try {
45 final Element error = cause.toXml(DomUtil.createDocument());
46 if (DomUtil.matches(error, DavException.XML_ERROR, DavConstants.NAMESPACE) && DomUtil.hasChildElement(error, "exception", null)) {
47 final Element exc = DomUtil.getChildElement(error, "exception", null);
48 if (DomUtil.hasChildElement(exc, "message", null)) {
49 msg = DomUtil.getChildText(exc, "message", null);
50 }
51 if (DomUtil.hasChildElement(exc, "class", null)) {
52 final Class<?> cl = Class.forName(DomUtil.getChildText(exc, "class", null));
53 final Constructor<?> excConstr = cl.getConstructor(String.class);
54 final Object o = excConstr.newInstance(msg);
55 if (o instanceof FileSystemException) {
56 return (FileSystemException) o;
57 }
58 if (o instanceof Exception) {
59 return new FileSystemException(msg, (Exception) o);
60 }
61 }
62 }
63 } catch (final Exception e) {
64 throw new FileSystemException(e);
65 }
66 }
67
68 return new FileSystemException(msg);
69 }
70
71 /** Disallow instantiation. */
72 private ExceptionConverter() {
73 }
74 }