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Adding truncate to FileWriter

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This commit is contained in:
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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130
framework/assets/js/file.js
View File

@ -46,13 +46,16 @@ File._createEvent = function(type, target) {
function FileError() {
// File error codes
// Found in DOMException
this.NOT_FOUND_ERR = 8;
this.SECURITY_ERR = 18;
this.ABORT_ERR = 20;
this.NOT_FOUND_ERR = 1;
this.SECURITY_ERR = 2;
this.ABORT_ERR = 3;
// Added by this specification
this.NOT_READABLE_ERR = 24;
this.ENCODING_ERR = 26;
this.NOT_READABLE_ERR = 4;
this.ENCODING_ERR = 5;
this.NO_MODIFICATION_ALLOWED_ERR = 6;
this.INVALID_STATE_ERR = 7;
this.SYNTAX_ERR = 8;
this.code = null;
};
@ -99,6 +102,10 @@ FileMgr.prototype.writeAsText = function(fileName, data, append, successCallback
PhoneGap.exec(successCallback, errorCallback, "File", "writeAsText", [fileName, data, append]);
};
FileMgr.prototype.truncate = function(fileName, size, successCallback, errorCallback) {
PhoneGap.exec(successCallback, errorCallback, "File", "truncate", [fileName, size]);
};
FileMgr.prototype.readAsText = function(fileName, encoding, successCallback, errorCallback) {
PhoneGap.exec(successCallback, errorCallback, "File", "readAsText", [fileName, encoding]);
};
@ -337,6 +344,16 @@ FileReader.prototype.readAsBinaryString = function(file) {
this.fileName = file;
};
/**
* Read file and return data as a binary data.
*
* @param file The name of the file
*/
FileReader.prototype.readAsArrayBuffer = function(file) {
// TODO - Can't return binary data to browser.
this.fileName = file;
};
//-----------------------------------------------------------------------------
// File Writer
//-----------------------------------------------------------------------------
@ -388,7 +405,12 @@ FileWriter.prototype.abort = function() {
};
FileWriter.prototype.writeAsText = function(file, text, bAppend) {
if (bAppend != true) {
// Throw an exception if we are already writing a file
if (this.readyState == FileWriter.WRITING) {
throw FileError.INVALID_STATE_ERR;
}
if (bAppend != true) {
bAppend = false; // for null values
}
@ -399,6 +421,12 @@ FileWriter.prototype.writeAsText = function(file, text, bAppend) {
var me = this;
// If onwritestart callback
if (typeof me.onwritestart == "function") {
var evt = File._createEvent("writestart", me);
me.onwritestart(evt);
}
// Write file
navigator.fileMgr.writeAsText(file, text, bAppend,
@ -413,15 +441,15 @@ FileWriter.prototype.writeAsText = function(file, text, bAppend) {
// Save result
me.result = r;
// DONE state
me.readyState = FileWriter.DONE;
// If onwrite callback
if (typeof me.onwrite == "function") {
var evt = File._createEvent("write", me);
me.onwrite(evt);
}
// DONE state
me.readyState = FileWriter.DONE;
// If onwriteend callback
if (typeof me.onwriteend == "function") {
var evt = File._createEvent("writeend", me);
@ -440,15 +468,15 @@ FileWriter.prototype.writeAsText = function(file, text, bAppend) {
// Save error
me.error = e;
// DONE state
me.readyState = FileWriter.DONE;
// If onerror callback
if (typeof me.onerror == "function") {
var evt = File._createEvent("error", me);
me.onerror(evt);
}
// DONE state
me.readyState = FileWriter.DONE;
// If onwriteend callback
if (typeof me.onwriteend == "function") {
var evt = File._createEvent("writeend", me);
@ -459,3 +487,81 @@ FileWriter.prototype.writeAsText = function(file, text, bAppend) {
};
FileWriter.prototype.truncate = function(file, size) {
// Throw an exception if we are already writing a file
if (this.readyState == FileWriter.WRITING) {
throw FileError.INVALID_STATE_ERR;
}
this.fileName = file;
// WRITING state
this.readyState = FileWriter.WRITING;
var me = this;
// If onwritestart callback
if (typeof me.onwritestart == "function") {
var evt = File._createEvent("writestart", me);
me.onwritestart(evt);
}
// Write file
navigator.fileMgr.truncate(file, size,
// Success callback
function(r) {
// If DONE (cancelled), then don't do anything
if (me.readyState == FileWriter.DONE) {
return;
}
// Save result
me.result = r;
// If onwrite callback
if (typeof me.onwrite == "function") {
var evt = File._createEvent("write", me);
me.onwrite(evt);
}
// DONE state
me.readyState = FileWriter.DONE;
// If onwriteend callback
if (typeof me.onwriteend == "function") {
var evt = File._createEvent("writeend", me);
me.onwriteend(evt);
}
},
// Error callback
function(e) {
// If DONE (cancelled), then don't do anything
if (me.readyState == FileWriter.DONE) {
return;
}
// Save error
me.error = e;
// If onerror callback
if (typeof me.onerror == "function") {
var evt = File._createEvent("error", me);
me.onerror(evt);
}
// DONE state
me.readyState = FileWriter.DONE;
// If onwriteend callback
if (typeof me.onwriteend == "function") {
var evt = File._createEvent("writeend", me);
me.onwriteend(evt);
}
}
);
};

42
framework/src/com/phonegap/FileUtils.java
View File

@ -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);
}
}
}