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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   * {@code ExceptionConverter} converts WebDAV exceptions into FileSystemExceptions.
30   *
31   * @since 2.0
32   */
33  public final class ExceptionConverter {
34  
35      // avoid instanciation
36      private ExceptionConverter() {
37      }
38  
39      public static FileSystemExcFileSystemException(final DavException davExc) throws FileSystemException {
40          return generate(davExc, null);
41      }
42  
43      public static FileSystemException generate(final DavException davExc, final DavMethod method)
44              throws FileSystemException {
45          String msg = davExc.getMessage();
46          if (davExc.hasErrorCondition()) {
47              try {
48                  final Element error = davExc.toXml(DomUtil.BUILDER_FACTORY.newDocumentBuilder().newDocument());
49                  if (DomUtil.matches(error, DavException.XML_ERROR, DavConstants.NAMESPACE)) {
50                      if (DomUtil.hasChildElement(error, "exception", null)) {
51                          final Element exc = DomUtil.getChildElement(error, "exception", null);
52                          if (DomUtil.hasChildElement(exc, "message", null)) {
53                              msg = DomUtil.getChildText(exc, "message", null);
54                          }
55                          if (DomUtil.hasChildElement(exc, "class", null)) {
56                              final Class<?> cl = Class.forName(DomUtil.getChildText(exc, "class", null));
57                              final Constructor<?> excConstr = cl.getConstructor(new Class[] { String.class });
58                              if (excConstr != null) {
59                                  final Object o = excConstr.newInstance(new Object[] { msg });
60                                  if (o instanceof FileSystemException) {
61                                      return (FileSystemException) o;
62                                  } else if (o instanceof Exception) {
63                                      return new FileSystemException(msg, (Exception) o);
64                                  }
65                              }
66                          }
67                      }
68                  }
69              } catch (final Exception e) {
70                  throw new FileSystemException(e);
71              }
72          }
73  
74          return new FileSystemException(msg);
75      }
76  }