1 /**
2 *
3 * Copyright 2005 The Apache Software Foundation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * 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.geronimo.kernel.config.xstream;
18
19 import java.io.IOException;
20 import java.io.InputStream;
21 import java.io.InputStreamReader;
22 import java.io.OutputStream;
23 import java.io.Reader;
24 import java.io.PushbackInputStream;
25 import java.io.ObjectStreamConstants;
26 import java.util.Collection;
27
28 import com.thoughtworks.xstream.XStream;
29 import org.apache.geronimo.kernel.config.ConfigurationData;
30 import org.apache.geronimo.kernel.config.ConfigurationMarshaler;
31 import org.apache.geronimo.kernel.config.GBeanState;
32 import org.apache.geronimo.kernel.config.SerializedConfigurationMarshaler;
33
34 /**
35 * @version $Rev: 410741 $ $Date: 2006-05-31 21:35:48 -0700 (Wed, 31 May 2006) $
36 */
37 public class XStreamConfigurationMarshaler implements ConfigurationMarshaler {
38 private static byte[] SERIALIZED_MAGIC = new byte[] {
39 (byte) ((ObjectStreamConstants.STREAM_MAGIC >>> 8) & 0xFF),
40 (byte) ((ObjectStreamConstants.STREAM_MAGIC >>> 0) & 0xFF)
41 };
42
43 public XStreamConfigurationMarshaler() {
44
45 XStreamUtil.createXStream();
46 }
47
48 public ConfigurationData readConfigurationData(InputStream in) throws IOException, ClassNotFoundException {
49 PushbackInputStream pushbackInputStream = new PushbackInputStream(in, 2);
50 byte[] streamHeader = new byte[2];
51 if (pushbackInputStream.read(streamHeader) != 2) throw new AssertionError("Cound not read stream header");
52 pushbackInputStream.unread(streamHeader);
53
54
55 if (SERIALIZED_MAGIC[0] == streamHeader[0] && SERIALIZED_MAGIC[1] == streamHeader[1]) {
56 return new SerializedConfigurationMarshaler().readConfigurationData(pushbackInputStream);
57 }
58
59 XStream xstream = XStreamUtil.createXStream();
60 Reader reader = new InputStreamReader(pushbackInputStream);
61 ConfigurationData configurationData = (ConfigurationData)xstream.fromXML(reader);
62 return configurationData;
63 }
64
65 public void writeConfigurationData(ConfigurationData configurationData, OutputStream out) throws IOException {
66 XStream xstream = XStreamUtil.createXStream();
67 String xml = xstream.toXML(configurationData);
68
69 out.write(("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
70 "\n" +
71 "<!-- ======================================================== -->\n" +
72 "<!-- Warning - Modification of this file may cause server -->\n" +
73 "<!-- instability. Also, the format of this XML file is -->\n" +
74 "<!-- undocumented and subject to change without notice. -->\n" +
75 "<!-- ======================================================== -->\n" +
76 "\n").getBytes());
77
78 out.write(xml.getBytes());
79 out.flush();
80 }
81
82 public GBeanState newGBeanState(Collection gbeans) {
83 return new XStreamGBeanState(gbeans);
84 }
85 }