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1 package org.nanocontainer.deployer;
2
3 import org.apache.commons.vfs.FileObject;
4 import org.apache.commons.vfs.FileSystemException;
5 import org.apache.commons.vfs.FileSystemManager;
6 import org.apache.commons.vfs.FileType;
7
8 import java.util.ArrayList  ;
9 import java.util.Arrays ;
10 import java.util.Iterator ;
11 import java.util.List ;
12
13
17 public class DifferenceAnalysingFolderContentHandler implements FolderContentHandler {
18 private final FileObject folder;
19 private final FileSystemManager fileSystemManager;
20
21 private FileObject[] lastChildren = new FileObject[0];
22
23 public DifferenceAnalysingFolderContentHandler(FileObject folder, FileSystemManager fileSystemManager) {
24 this.folder = folder;
25 this.fileSystemManager = fileSystemManager;
26 }
27
28 public void setCurrentChildren(FileObject[] currentChildren) {
29 List current = Arrays.asList(currentChildren);
30 List last = Arrays.asList(lastChildren);
31
32 fireFolderAddedMaybe(current, last);
33 fireFolderRemovedMaybe(current, last);
34
35 lastChildren = currentChildren;
36 }
37
38 private void fireFolderAddedMaybe(List current, List last) {
39 current = new ArrayList (current);
40 last = new ArrayList (last);
41
42 current.removeAll(last);
43 for (Iterator iterator = current.iterator(); iterator.hasNext();) {
44 FileObject fileObject = (FileObject) iterator.next();
45 FileObject folderObject = convertToFolder(fileObject);
46 if (folderObject != null && folderListener != null) {
47 folderListener.folderAdded(folderObject);
48 }
49 }
50 }
51
52 private void fireFolderRemovedMaybe(List current, List last) {
53 current = new ArrayList (current);
54 last = new ArrayList (last);
55
56 last.removeAll(current);
57 for (Iterator iterator = last.iterator(); iterator.hasNext();) {
58 FileObject fileObject = (FileObject) iterator.next();
59 FileObject folderObject = convertToFolder(fileObject);
60 if (folderObject != null && folderListener != null) {
61 folderListener.folderRemoved(fileObject);
62 }
63 }
64 }
65
66 private FileObject convertToFolder(FileObject fileObject) {
67 FileObject result = null;
68 try {
69 if (fileObject.getType().equals(FileType.FOLDER)) {
70 result = fileObject;
71 } else if (fileObject.getType().equals(FileType.FILE)) {
72 String extension = fileObject.getName().getExtension();
73 if (extension.equals("zip") || extension.equals("jar")) {
74 String url = "zip:" + fileObject.getURL().getFile();
75 result = fileSystemManager.resolveFile(url);
76 }
77 }
78 } catch (FileSystemException ignore) {
79 }
80 return result;
81 }
82
83 public FileObject getFolder() {
84 return folder;
85 }
86
87 private FolderListener folderListener;
88
89 public void addFolderListener(FolderListener folderListener) {
90 if (this.folderListener != null) {
91 throw new IllegalStateException (FolderListener.class.getName() + " already added");
92 }
93 this.folderListener = folderListener;
94 }
95
96 public void removeFolderListener(DeployingFolderListener deployingFolderListener) {
97 this.folderListener = null;
98 }
99 } |
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