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1
19
20 package org.netbeans.modules.project.ant;
21
22 import java.io.File  ;
23 import java.util.Map ;
24 import java.util.WeakHashMap ;
25 import org.openide.filesystems.FileObject;
26 import java.lang.ref.WeakReference ;
27 import java.util.HashMap ;
28
29 import org.openide.filesystems.FileChangeListener;
30 import org.openide.filesystems.FileAttributeEvent;
31 import org.openide.filesystems.FileEvent;
32 import org.openide.filesystems.FileRenameEvent;
33 import org.openide.filesystems.FileUtil;
34 import org.openide.util.Utilities;
35
36
38
47 public final class FileChangeSupport {
48
49 public static FileChangeSupport DEFAULT = new FileChangeSupport();
50
51 private FileChangeSupport() {}
52
53 private final Map <FileChangeSupportListener,Map <File ,Holder>> holders = new WeakHashMap <FileChangeSupportListener,Map <File ,Holder>>();
54
55
62 public void addListener(FileChangeSupportListener listener, File path) {
63 assert path.equals(FileUtil.normalizeFile(path)) : "Need to normalize " + path + " before passing to FCS!";
64 Map <File ,Holder> f2H = holders.get(listener);
65 if (f2H == null) {
66 f2H = new HashMap <File ,Holder>();
67 holders.put(listener, f2H);
68 }
69 if (f2H.containsKey(path)) {
70 throw new IllegalArgumentException ("Already listening to " + path); }
72 f2H.put(path, new Holder(listener, path));
73 }
74
75
78 public void removeListener(FileChangeSupportListener listener, File path) {
79 assert path.equals(FileUtil.normalizeFile(path)) : "Need to normalize " + path + " before passing to FCS!";
80 Map <File ,Holder> f2H = holders.get(listener);
81 if (f2H == null) {
82 throw new IllegalArgumentException ("Was not listening to " + path); }
84 if (!f2H.containsKey(path)) {
85 throw new IllegalArgumentException (listener + " was not listening to " + path + "; only to " + f2H.keySet()); }
87 f2H.remove(path);
88 }
89
90 private static final class Holder extends WeakReference <FileChangeSupportListener> implements FileChangeListener, Runnable {
91
92 private final File path;
93 private FileObject current;
94 private File currentF;
95
96 public Holder(FileChangeSupportListener listener, File path) {
97 super(listener, Utilities.activeReferenceQueue());
98 assert path != null;
99 this.path = path;
100 locateCurrent();
101 }
102
103 private void locateCurrent() {
104 FileObject oldCurrent = current;
105 currentF = path;
106 while (true) {
107 try {
108 current = FileUtil.toFileObject(currentF);
109 } catch (IllegalArgumentException x) {
110 currentF = FileUtil.normalizeFile(currentF);
112 current = FileUtil.toFileObject(currentF);
113 }
114 if (current != null) {
115 break;
116 }
117 currentF = currentF.getParentFile();
118 if (currentF == null) {
119 return;
122 }
123 }
124 assert current != null;
126 if (current != oldCurrent) {
127 if (oldCurrent != null) {
128 oldCurrent.removeFileChangeListener(this);
129 }
130 current.addFileChangeListener(this);
131 current.getChildren(); }
133 }
134
135 private void someChange(FileObject modified) {
136 FileChangeSupportListener listener;
137 FileObject oldCurrent, nueCurrent;
138 File oldCurrentF, nueCurrentF;
139 synchronized (this) {
140 if (current == null) {
141 return;
142 }
143 listener = get();
144 if (listener == null) {
145 return;
146 }
147 oldCurrent = current;
148 oldCurrentF = currentF;
149 locateCurrent();
150 nueCurrent = current;
151 nueCurrentF = currentF;
152 }
153 if (modified != null && modified == nueCurrent) {
154 FileChangeSupportEvent event = new FileChangeSupportEvent(DEFAULT, FileChangeSupportEvent.EVENT_MODIFIED, path);
155 listener.fileModified(event);
156 } else {
157 boolean oldWasCorrect = path.equals(oldCurrentF);
158 boolean nueIsCorrect = path.equals(nueCurrentF);
159 if (oldWasCorrect && !nueIsCorrect) {
160 FileChangeSupportEvent event = new FileChangeSupportEvent(DEFAULT, FileChangeSupportEvent.EVENT_DELETED, path);
161 listener.fileDeleted(event);
162 } else if (nueIsCorrect && !oldWasCorrect) {
163 FileChangeSupportEvent event = new FileChangeSupportEvent(DEFAULT, FileChangeSupportEvent.EVENT_CREATED, path);
164 listener.fileCreated(event);
165 }
166 }
167 }
168
169 public void fileChanged(FileEvent fe) {
170 someChange(fe.getFile());
171 }
172
173 public void fileDeleted(FileEvent fe) {
174 someChange(null);
175 }
176
177 public void fileDataCreated(FileEvent fe) {
178 someChange(null);
179 }
180
181 public void fileFolderCreated(FileEvent fe) {
182 someChange(null);
183 }
184
185 public void fileRenamed(FileRenameEvent fe) {
186 someChange(null);
187 }
188
189 public void fileAttributeChanged(FileAttributeEvent fe) {
190 }
192
193 public synchronized void run() {
194 if (current != null) {
195 current.removeFileChangeListener(this);
196 current = null;
197 }
198 }
199
200 }
201
202 }
203 |
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