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Adding truncate to FileWriter

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macdonst
2010-10-28 22:17:20 -04:00
parent b7024ad1f5
commit 2e5d6f5b74
2 changed files with 154 additions and 18 deletions
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framework/src/com/phonegap/FileUtils.java
+36 -6
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@@ -8,6 +8,7 @@
package com.phonegap;
import java.io.*;
import java.nio.channels.FileChannel;
import org.apache.commons.codec.binary.Base64;
import org.json.JSONArray;
@@ -21,13 +22,15 @@ import com.phonegap.api.PluginResult;
* Only files on the SD card can be accessed.
*/
public class FileUtils extends Plugin {
public static int NOT_FOUND_ERR = 1;
public static int SECURITY_ERR = 2;
public static int ABORT_ERR = 3;
public static int NOT_FOUND_ERR = 8;
public static int SECURITY_ERR = 18;
public static int ABORT_ERR = 20;
public static int NOT_READABLE_ERR = 24;
public static int ENCODING_ERR = 26;
public static int NOT_READABLE_ERR = 4;
public static int ENCODING_ERR = 5;
public static int NO_MODIFICATION_ALLOWED_ERR = 6;
public static int INVALID_STATE_ERR = 7;
public static int SYNTAX_ERR = 8;
FileReader f_in;
FileWriter f_out;
@@ -114,6 +117,17 @@ public class FileUtils extends Plugin {
e.printStackTrace();
return new PluginResult(PluginResult.Status.ERROR, FileUtils.NOT_READABLE_ERR);
}
}
else if (action.equals("truncate")) {
try {
this.truncateFile(args.getString(0), args.getLong(1));
} catch (FileNotFoundException e) {
e.printStackTrace();
return new PluginResult(PluginResult.Status.ERROR, FileUtils.NOT_FOUND_ERR);
} catch (IOException e) {
e.printStackTrace();
return new PluginResult(PluginResult.Status.ERROR, FileUtils.NOT_READABLE_ERR);
}
}
return new PluginResult(status, result);
} catch (JSONException e) {
@@ -210,5 +224,21 @@ public class FileUtils extends Plugin {
out.close();
}
/**
* Truncate the file to size
*
* @param filename
* @param size
* @throws FileNotFoundException, IOException
*/
private void truncateFile(String filename, long size) throws FileNotFoundException, IOException {
RandomAccessFile raf = new RandomAccessFile(filename, "rw");
if (raf.length() >= size) {
FileChannel channel = raf.getChannel();
channel.truncate(size);
}
}
}