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16 package org.outerj.daisy.frontend.admin;
17
18 import org.apache.excalibur.source.SourceResolver;
19 import org.apache.excalibur.source.Source;
20 import org.apache.excalibur.source.impl.FileSource;
21 import org.apache.avalon.framework.thread.ThreadSafe;
22 import org.apache.avalon.framework.service.Serviceable;
23 import org.apache.avalon.framework.service.ServiceManager;
24 import org.apache.avalon.framework.service.ServiceException;
25 import org.apache.avalon.framework.activity.Initializable;
26 import org.apache.avalon.framework.activity.Disposable;
27 import org.apache.avalon.framework.logger.AbstractLogEnabled;
28 import org.apache.avalon.framework.configuration.Configurable;
29 import org.apache.avalon.framework.configuration.Configuration;
30 import org.apache.avalon.framework.configuration.ConfigurationException;
31 import org.apache.avalon.excalibur.monitor.ActiveMonitor;
32 import org.apache.avalon.excalibur.monitor.FileResource;
33 import org.outerj.daisy.repository.LocaleHelper;
34
35 import java.io.*;
36 import java.util.ArrayList  ;
37 import java.util.Locale ;
38 import java.beans.PropertyChangeListener ;
39 import java.beans.PropertyChangeEvent ;
40
41 public class AdminLocalesImpl extends AbstractLogEnabled implements AdminLocales, ThreadSafe, Configurable, Serviceable, Initializable, Disposable {
42 private Locales locales;
43 private ServiceManager serviceManager;
44 private ActiveMonitor monitor;
45 private String localesURI;
46 private File localesFile;
47 private FileResource monitoredResource;
48
49 public void service(ServiceManager serviceManager) throws ServiceException {
50 this.serviceManager = serviceManager;
51 monitor = (ActiveMonitor)serviceManager.lookup(ActiveMonitor.ROLE);
52 }
53
54 public void configure(Configuration configuration) throws ConfigurationException {
55 localesURI = configuration.getChild("localesSource").getValue();
56 }
57
58 public void initialize() throws Exception {
59 SourceResolver sourceResolver = null;
60 Source localesSource = null;
61 try {
62 sourceResolver = (SourceResolver)serviceManager.lookup(SourceResolver.ROLE);
63 localesSource = sourceResolver.resolveURI(localesURI);
64 if (localesSource instanceof FileSource) {
65 localesFile = ((FileSource)localesSource).getFile();
66 monitoredResource = new FileResource(localesFile);
67 monitoredResource.addPropertyChangeListener(new ResourceListener());
68 monitor.addResource(monitoredResource);
69 } else {
70 throw new Exception ("Source for the list of admin locales must be a file, not: " + localesURI);
71 }
72 } finally {
73 if (localesSource != null)
74 sourceResolver.release(localesSource);
75 if (sourceResolver != null)
76 serviceManager.release(sourceResolver);
77 }
78 reloadLocales();
79 }
80
81 private synchronized void reloadLocales() {
82 ArrayList locales = new ArrayList ();
83 InputStream is = null;
84
85 try {
86 is = new FileInputStream(localesFile);
87 BufferedReader reader = new BufferedReader(new InputStreamReader(is));
88 String line = reader.readLine();
89 while (line != null) {
90 if (line.equals("empty")) {
91 locales.add("");
92 } else if (line.length() > 0 && line.charAt(0) != '#') {
93 locales.add(line.trim());
94 }
95 line = reader.readLine();
96 }
97 } catch (Exception e) {
98 getLogger().error("Error reading locales.", e);
99 } finally {
100 try {
101 if (is != null)
102 is.close();
103 } catch (Exception e) {
104 getLogger().error("Error closing input stream of locales file.", e);
105 }
106 }
107
108 String [] localeStrings = (String [])locales.toArray(new String [locales.size()]);
109 Locale [] localeObjects = new Locale [localeStrings.length];
110 for (int i = 0; i < localeStrings.length; i++) {
111 localeObjects[i] = LocaleHelper.parseLocale(localeStrings[i]);
112 }
113 this.locales = new LocalesImpl(localeStrings, localeObjects);
114 }
115
116 public Locales getLocales() {
117 return locales;
118 }
119
120 public void dispose() {
121 monitor.removeResource(monitoredResource);
122 serviceManager.release(monitor);
123 }
124
125 class ResourceListener implements PropertyChangeListener {
126 public void propertyChange(PropertyChangeEvent evt) {
127 if (evt.getPropertyName().equals("last-modified")) {
128 reloadLocales();
129 }
130 }
131 }
132
133 static class LocalesImpl implements Locales {
134 private String [] localeStrings;
135 private Locale [] localeObjects;
136
137 public LocalesImpl(String [] localeStrings, Locale [] localeObjects) {
138 this.localeStrings = localeStrings;
139 this.localeObjects = localeObjects;
140 }
141
142 public String [] getAsStrings() {
143 return localeStrings;
144 }
145
146 public Locale [] getAsObjects() {
147 return localeObjects;
148 }
149 }
150 }
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