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cordova.define("org.apache.cordova.file.FileReader", function(require, exports, module) { /*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
var exec = require('cordova/exec'),
modulemapper = require('cordova/modulemapper'),
utils = require('cordova/utils'),
File = require('./File'),
FileError = require('./FileError'),
ProgressEvent = require('./ProgressEvent'),
origFileReader = modulemapper.getOriginalSymbol(this, 'FileReader');
/**
* This class reads the mobile device file system.
*
* For Android:
* The root directory is the root of the file system.
* To read from the SD card, the file name is "sdcard/my_file.txt"
* @constructor
*/
var FileReader = function() {
this._readyState = 0;
this._error = null;
this._result = null;
this._localURL = '';
this._realReader = origFileReader ? new origFileReader() : {};
};
// States
FileReader.EMPTY = 0;
FileReader.LOADING = 1;
FileReader.DONE = 2;
utils.defineGetter(FileReader.prototype, 'readyState', function() {
return this._localURL ? this._readyState : this._realReader.readyState;
});
utils.defineGetter(FileReader.prototype, 'error', function() {
return this._localURL ? this._error: this._realReader.error;
});
utils.defineGetter(FileReader.prototype, 'result', function() {
return this._localURL ? this._result: this._realReader.result;
});
function defineEvent(eventName) {
utils.defineGetterSetter(FileReader.prototype, eventName, function() {
return this._realReader[eventName] || null;
}, function(value) {
this._realReader[eventName] = value;
});
}
defineEvent('onloadstart'); // When the read starts.
defineEvent('onprogress'); // While reading (and decoding) file or fileBlob data, and reporting partial file data (progress.loaded/progress.total)
defineEvent('onload'); // When the read has successfully completed.
defineEvent('onerror'); // When the read has failed (see errors).
defineEvent('onloadend'); // When the request has completed (either in success or failure).
defineEvent('onabort'); // When the read has been aborted. For instance, by invoking the abort() method.
function initRead(reader, file) {
// Already loading something
if (reader.readyState == FileReader.LOADING) {
throw new FileError(FileError.INVALID_STATE_ERR);
}
reader._result = null;
reader._error = null;
reader._readyState = FileReader.LOADING;
if (typeof file.localURL == 'string') {
reader._localURL = file.localURL;
} else {
reader._localURL = '';
return true;
}
reader.onloadstart && reader.onloadstart(new ProgressEvent("loadstart", {target:reader}));
}
/**
* Abort reading file.
*/
FileReader.prototype.abort = function() {
if (origFileReader && !this._localURL) {
return this._realReader.abort();
}
this._result = null;
if (this._readyState == FileReader.DONE || this._readyState == FileReader.EMPTY) {
return;
}
this._readyState = FileReader.DONE;
// If abort callback
if (typeof this.onabort === 'function') {
this.onabort(new ProgressEvent('abort', {target:this}));
}
// If load end callback
if (typeof this.onloadend === 'function') {
this.onloadend(new ProgressEvent('loadend', {target:this}));
}
};
/**
* Read text file.
*
* @param file {File} File object containing file properties
* @param encoding [Optional] (see http://www.iana.org/assignments/character-sets)
*/
FileReader.prototype.readAsText = function(file, encoding) {
if (initRead(this, file)) {
return this._realReader.readAsText(file, encoding);
}
// Default encoding is UTF-8
var enc = encoding ? encoding : "UTF-8";
var me = this;
var execArgs = [this._localURL, enc, file.start, file.end];
// Read file
exec(
// Success callback
function(r) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// Save result
me._result = r;
// If onload callback
if (typeof me.onload === "function") {
me.onload(new ProgressEvent("load", {target:me}));
}
// DONE state
me._readyState = FileReader.DONE;
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
},
// Error callback
function(e) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
// null result
me._result = null;
// Save error
me._error = new FileError(e);
// If onerror callback
if (typeof me.onerror === "function") {
me.onerror(new ProgressEvent("error", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
}, "File", "readAsText", execArgs);
};
/**
* Read file and return data as a base64 encoded data url.
* A data url is of the form:
* data:[<mediatype>][;base64],<data>
*
* @param file {File} File object containing file properties
*/
FileReader.prototype.readAsDataURL = function(file) {
if (initRead(this, file)) {
return this._realReader.readAsDataURL(file);
}
var me = this;
var execArgs = [this._localURL, file.start, file.end];
// Read file
exec(
// Success callback
function(r) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
// Save result
me._result = r;
// If onload callback
if (typeof me.onload === "function") {
me.onload(new ProgressEvent("load", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
},
// Error callback
function(e) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
me._result = null;
// Save error
me._error = new FileError(e);
// If onerror callback
if (typeof me.onerror === "function") {
me.onerror(new ProgressEvent("error", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
}, "File", "readAsDataURL", execArgs);
};
/**
* Read file and return data as a binary data.
*
* @param file {File} File object containing file properties
*/
FileReader.prototype.readAsBinaryString = function(file) {
if (initRead(this, file)) {
return this._realReader.readAsBinaryString(file);
}
var me = this;
var execArgs = [this._localURL, file.start, file.end];
// Read file
exec(
// Success callback
function(r) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
me._result = r;
// If onload callback
if (typeof me.onload === "function") {
me.onload(new ProgressEvent("load", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
},
// Error callback
function(e) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
me._result = null;
// Save error
me._error = new FileError(e);
// If onerror callback
if (typeof me.onerror === "function") {
me.onerror(new ProgressEvent("error", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
}, "File", "readAsBinaryString", execArgs);
};
/**
* Read file and return data as a binary data.
*
* @param file {File} File object containing file properties
*/
FileReader.prototype.readAsArrayBuffer = function(file) {
if (initRead(this, file)) {
return this._realReader.readAsArrayBuffer(file);
}
var me = this;
var execArgs = [this._localURL, file.start, file.end];
// Read file
exec(
// Success callback
function(r) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
me._result = r;
// If onload callback
if (typeof me.onload === "function") {
me.onload(new ProgressEvent("load", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
},
// Error callback
function(e) {
// If DONE (cancelled), then don't do anything
if (me._readyState === FileReader.DONE) {
return;
}
// DONE state
me._readyState = FileReader.DONE;
me._result = null;
// Save error
me._error = new FileError(e);
// If onerror callback
if (typeof me.onerror === "function") {
me.onerror(new ProgressEvent("error", {target:me}));
}
// If onloadend callback
if (typeof me.onloadend === "function") {
me.onloadend(new ProgressEvent("loadend", {target:me}));
}
}, "File", "readAsArrayBuffer", execArgs);
};
module.exports = FileReader;
});