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.log4j.chainsaw;
18
19 import java.io.File;
20 import java.io.FileReader;
21 import java.io.FileWriter;
22
23 import com.thoughtworks.xstream.XStream;
24 import com.thoughtworks.xstream.io.xml.DomDriver;
25
26 import org.apache.log4j.chainsaw.prefs.LoadSettingsEvent;
27 import org.apache.log4j.chainsaw.prefs.SaveSettingsEvent;
28 import org.apache.log4j.chainsaw.prefs.SettingsListener;
29 import org.apache.log4j.chainsaw.prefs.SettingsManager;
30
31 /**
32 * Helper class that helps delegate the work of loading and saving the values
33 * of the ApplicationPreferenceModel, allowing that class to remain a simple
34 * bean.
35 *
36 * The Model passed to this class' constructor is the instance of the ApplicationPreference
37 * that will be saved, and will have properties modified by loading from the
38 * 'chainsaw.settings.xml' file in the .chainsaw directory of the user's home directory.
39 *
40 * @author psmith
41 *
42 */
43 public class ApplicationPreferenceModelSaver implements SettingsListener {
44
45 private final ApplicationPreferenceModel model;
46
47 /**
48 * @param model
49 */
50 public ApplicationPreferenceModelSaver(final ApplicationPreferenceModel model) {
51 this.model = model;
52 }
53
54 public void loadSettings(LoadSettingsEvent event) {
55 XStream stream = new XStream(new DomDriver());
56 File file = getApplicationPreferenceXMLFile(SettingsManager.getInstance().getSettingsDirectory());
57 try {
58 if (file.exists()) {
59 FileReader reader = new FileReader(file);
60 ApplicationPreferenceModel loadedModel = (ApplicationPreferenceModel) stream
61 .fromXML(reader);
62 model.apply(loadedModel);
63 reader.close();
64 }
65 } catch (Exception e) {
66 // TODO exception handling
67 e.printStackTrace();
68 //unable to process - delete file
69 file.delete();
70 }
71 }
72
73 public void saveSettings(SaveSettingsEvent event) {
74 XStream stream = new XStream(new DomDriver());
75 try {
76 File file = getApplicationPreferenceXMLFile(event.getSettingsLocation());
77 FileWriter writer = new FileWriter(file);
78 stream.toXML(model, writer);
79 writer.close();
80 } catch (Exception e) {
81 // TODO exception handling
82 e.printStackTrace();
83 }
84
85 }
86
87 private File getApplicationPreferenceXMLFile(File settingsLocation) {
88 return new File(settingsLocation, "chainsaw.settings.xml");
89 }
90
91 }