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Implement document moving on Android

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* java/org/gnu/emacs/EmacsDocumentsProvider.java
(notifyChangeByName): New function.
(queryDocument1): Set FLAG_SUPPORTS_MOVE where necessary.
(moveDocument): Implement new function.
This commit is contained in:
Po Lu 2023-05-14 11:12:54 +08:00
parent 4d4a96b206
commit 841b0e2201
1 changed files with 113 additions and 1 deletions
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114
java/org/gnu/emacs/EmacsDocumentsProvider.java
View file

@ -38,7 +38,9 @@ import android.webkit.MimeTypeMap;
import android.net.Uri;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/* ``Documents provider''. This allows Emacs's home directory to be
@ -155,6 +157,22 @@ public final class EmacsDocumentsProvider extends DocumentsProvider
context.getContentResolver ().notifyChange (updatedUri, null);
}
/* Inform the system that FILE's contents (or FILE itself) has
changed. FILE is a string describing containing the file name of
a directory as opposed to a File. */
private void
notifyChangeByName (String file)
{
Uri updatedUri;
Context context;
context = getContext ();
updatedUri
= buildChildDocumentsUri ("org.gnu.emacs", file);
context.getContentResolver ().notifyChange (updatedUri, null);
}
/* Return the MIME type of a file FILE. */
private String
@ -212,6 +230,9 @@ public final class EmacsDocumentsProvider extends DocumentsProvider
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_MOVE;
}
}
else if (file.canWrite ())
@ -224,7 +245,10 @@ public final class EmacsDocumentsProvider extends DocumentsProvider
flags |= Document.FLAG_SUPPORTS_RENAME;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
flags |= Document.FLAG_SUPPORTS_REMOVE;
{
flags |= Document.FLAG_SUPPORTS_REMOVE;
flags |= Document.FLAG_SUPPORTS_MOVE;
}
}
displayName = file.getName ();
@ -460,4 +484,92 @@ public final class EmacsDocumentsProvider extends DocumentsProvider
{
return documentId.startsWith (parentDocumentId);
}
@Override
public String
moveDocument (String sourceDocumentId,
String sourceParentDocumentId,
String targetParentDocumentId)
throws FileNotFoundException
{
File file, newName;
FileInputStream inputStream;
FileOutputStream outputStream;
byte buffer[];
int length;
file = new File (sourceDocumentId);
/* Now, create the file name of the parent document. */
newName = new File (targetParentDocumentId,
file.getName ());
/* Try to perform a simple rename, before falling back to
copying. */
if (file.renameTo (newName))
{
notifyChangeByName (file.getParent ());
notifyChangeByName (targetParentDocumentId);
return newName.getAbsolutePath ();
}
/* If that doesn't work, create the new file and copy over the old
file's contents. */
inputStream = null;
outputStream = null;
try
{
if (!newName.createNewFile ()
|| !newName.setWritable (true)
|| !newName.setReadable (true))
throw new FileNotFoundException ("failed to create new file");
/* Open the file in preparation for a copy. */
inputStream = new FileInputStream (file);
outputStream = new FileOutputStream (newName);
/* Allocate the buffer used to hold data. */
buffer = new byte[4096];
while ((length = inputStream.read (buffer)) > 0)
outputStream.write (buffer, 0, length);
}
catch (IOException e)
{
throw new FileNotFoundException ("IOException: " + e);
}
finally
{
try
{
if (inputStream != null)
inputStream.close ();
}
catch (IOException e)
{
}
try
{
if (outputStream != null)
outputStream.close ();
}
catch (IOException e)
{
}
}
file.delete ();
notifyChangeByName (file.getParent ());
notifyChangeByName (targetParentDocumentId);
return newName.getAbsolutePath ();
}
}