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.webdav;
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.client.methods.DavMethod;
25 import org.apache.jackrabbit.webdav.xml.DomUtil;
26 import org.w3c.dom.Element;
27
28 /**
29 * Converts WebDAV exceptions into FileSystemExceptions.
30 *
31 * @since 2.0
32 */
33 public final class ExceptionConverter {
34
35 /**
36 * Generates a new instance of FileSystemException.
37 *
38 * @param cause The cause of the new exception.
39 * @return A new FileSystemException.
40 * @throws FileSystemException If an Exception is caught while generating a new instance.
41 */
42 public static FileSystemException generate(final DavException cause) throws FileSystemException {
43 return generate(cause, null);
44 }
45
46 /**
47 * Generates a new instance of FileSystemException.
48 *
49 * @param cause The cause of the new exception.
50 * @param davMethod Ignored.
51 * @return A new FileSystemException.
52 * @throws FileSystemException If an Exception is caught while generating a new instance.
53 */
54 public static FileSystemException generate(final DavException cause, final DavMethod davMethod) throws FileSystemException {
55 String msg = cause.getMessage();
56 if (cause.hasErrorCondition()) {
57 try {
58 final Element error = cause.toXml(DomUtil.BUILDER_FACTORY.newDocumentBuilder().newDocument());
59 if (DomUtil.matches(error, DavException.XML_ERROR, DavConstants.NAMESPACE) && DomUtil.hasChildElement(error, "exception", null)) {
60 final Element exc = DomUtil.getChildElement(error, "exception", null);
61 if (DomUtil.hasChildElement(exc, "message", null)) {
62 msg = DomUtil.getChildText(exc, "message", null);
63 }
64 if (DomUtil.hasChildElement(exc, "class", null)) {
65 final Class<?> cl = Class.forName(DomUtil.getChildText(exc, "class", null));
66 final Constructor<?> excConstr = cl.getConstructor(String.class);
67 final Object o = excConstr.newInstance(msg);
68 if (o instanceof FileSystemException) {
69 return (FileSystemException) o;
70 }
71 if (o instanceof Exception) {
72 return new FileSystemException(msg, (Exception) o);
73 }
74 }
75 }
76 } catch (final Exception e) {
77 throw new FileSystemException(e);
78 }
79 }
80
81 return new FileSystemException(msg);
82 }
83
84 // avoid instantiation.
85 private ExceptionConverter() {
86 }
87 }