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Implement more features for the Emacs ``documents provider''

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* java/org/gnu/emacs/EmacsDocumentsProvider.java (queryRoots):
Implement isChild.
(getNotificationUri, notifyChange): New functions.
(queryDocument1): Set rename and remove flags.
(queryDocument, queryChildDocuments): Allow the requester to
detect changes in the directory hierarchy.
(createDocument, deleteDocument, removeDocument): Signal changes
to the directory hierarchy.
This commit is contained in:
Po Lu 2023-02-10 21:07:14 +08:00
parent 9b50500b22
commit 2489126e68
1 changed files with 101 additions and 23 deletions
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124
java/org/gnu/emacs/EmacsDocumentsProvider.java
View file

@ -114,7 +114,8 @@ public class EmacsDocumentsProvider extends DocumentsProvider
/* Add the appropriate flags. */
row.add (Root.COLUMN_FLAGS, Root.FLAG_SUPPORTS_CREATE);
row.add (Root.COLUMN_FLAGS, (Root.FLAG_SUPPORTS_CREATE
| Root.FLAG_SUPPORTS_IS_CHILD));
row.add (Root.FLAG_LOCAL_ONLY);
row.add (Root.COLUMN_TITLE, "Emacs");
row.add (Root.COLUMN_DOCUMENT_ID, baseDir.getAbsolutePath ());
@ -122,6 +123,36 @@ public class EmacsDocumentsProvider extends DocumentsProvider
return result;
}
private Uri
getNotificationUri (File file)
{
Uri updatedUri;
Context context;
context = getContext ();
updatedUri
= buildChildDocumentsUri ("org.gnu.emacs",
file.getAbsolutePath ());
return updatedUri;
}
/* Inform the system that FILE's contents (or FILE itself) has
changed. */
private void
notifyChange (File file)
{
Uri updatedUri;
Context context;
context = getContext ();
updatedUri
= buildChildDocumentsUri ("org.gnu.emacs",
file.getAbsolutePath ());
context.getContentResolver ().notifyChange (updatedUri, null);
}
/* Return the MIME type of a file FILE. */
private String
@ -174,6 +205,9 @@ public class EmacsDocumentsProvider extends DocumentsProvider
{
flags |= Document.FLAG_DIR_SUPPORTS_CREATE;
flags |= Document.FLAG_SUPPORTS_DELETE;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
flags |= Document.FLAG_SUPPORTS_RENAME;
}
}
else if (file.canWrite ())
@ -182,13 +216,11 @@ else if (file.canWrite ())
flags |= Document.FLAG_SUPPORTS_WRITE;
flags |= Document.FLAG_SUPPORTS_DELETE;
/* TODO: implement these
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
flags |= Document.FLAG_SUPPORTS_RENAME;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
flags |= Document.FLAG_SUPPORTS_RENAME;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
flags |= Document.FLAG_SUPPORTS_REMOVE; */
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
flags |= Document.FLAG_SUPPORTS_REMOVE;
}
displayName = file.getName ();
@ -208,12 +240,21 @@ else if (file.canWrite ())
throws FileNotFoundException
{
MatrixCursor result;
File file;
Context context;
file = new File (documentId);
context = getContext ();
if (projection == null)
projection = DEFAULT_DOCUMENT_PROJECTION;
result = new MatrixCursor (projection);
queryDocument1 (result, new File (documentId));
queryDocument1 (result, file);
/* Now allow interested applications to detect changes. */
result.setNotificationUri (context.getContentResolver (),
getNotificationUri (file));
return result;
}
@ -225,6 +266,7 @@ else if (file.canWrite ())
{
MatrixCursor result;
File directory;
Context context;
if (projection == null)
projection = DEFAULT_DOCUMENT_PROJECTION;
@ -239,6 +281,12 @@ else if (file.canWrite ())
for (File child : directory.listFiles ())
queryDocument1 (result, child);
context = getContext ();
/* Now allow interested applications to detect changes. */
result.setNotificationUri (context.getContentResolver (),
getNotificationUri (directory));
return result;
}
@ -256,12 +304,9 @@ else if (file.canWrite ())
createDocument (String documentId, String mimeType,
String displayName) throws FileNotFoundException
{
File file;
File file, parentFile;
boolean rc;
Uri updatedUri;
Context context;
context = getContext ();
file = new File (documentId, displayName);
try
@ -293,10 +338,10 @@ else if (file.canWrite ())
throw new FileNotFoundException (e.toString ());
}
updatedUri
= buildChildDocumentsUri ("org.gnu.emacs", documentId);
/* Tell the system about the change. */
context.getContentResolver ().notifyChange (updatedUri, null);
parentFile = file.getParentFile ();
if (parentFile != null)
notifyChange (parentFile);
return file.getAbsolutePath ();
}
@ -333,7 +378,6 @@ else if (file.canWrite ())
{
File file, parent;
File[] children;
Uri updatedUri;
Context context;
/* Java makes recursively deleting a file hard. File name
@ -347,14 +391,10 @@ else if (file.canWrite ())
throw new RuntimeException ("trying to delete file without"
+ " parent!");
updatedUri
= buildChildDocumentsUri ("org.gnu.emacs",
parent.getAbsolutePath ());
if (file.delete ())
{
/* Tell the system about the change. */
context.getContentResolver ().notifyChange (updatedUri, null);
notifyChange (parent);
return;
}
@ -368,7 +408,7 @@ else if (file.canWrite ())
if (file.delete ())
/* Tell the system about the change. */
context.getContentResolver ().notifyChange (updatedUri, null);
notifyChange (parent);
}
@Override
@ -378,4 +418,42 @@ else if (file.canWrite ())
{
deleteDocument (documentId);
}
@Override
public String
getDocumentType (String documentId)
{
return getMimeType (new File (documentId));
}
@Override
public String
renameDocument (String documentId, String displayName)
throws FileNotFoundException
{
File file, newName;
File parent;
file = new File (documentId);
parent = file.getParentFile ();
newName = new File (parent, displayName);
if (parent == null)
throw new FileNotFoundException ("parent is null");
file = new File (documentId);
if (!file.renameTo (newName))
return null;
notifyChange (parent);
return newName.getAbsolutePath ();
}
@Override
public boolean
isChildDocument (String parentDocumentId, String documentId)
{
return documentId.startsWith (parentDocumentId);
}
}