cordova-file-handler.ts
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import { Util } from './../util';
import { EventEmitter } from 'events';
import { FileHandler } from '../api/file-handler';
import { File } from '../api/file';
export class CordovaFileHandler extends EventEmitter implements FileHandler {
triggerFileTransfer(source:string, target:string) {
let fileTransfer = new window['FileTransfer']();
fileTransfer.onprogress = (progress:ProgressEvent) => {
this.emit('progress', progress.loaded / progress.total);
};
fileTransfer.download(
source ,
target ,
(entry:any) => {
this.emit('complete', entry);
} ,
(error:any) => {
this.emit('error', error);
},
true
);
}
download(source:string, target:string) {
if (!window['FileTransfer']) {
this.emit('error','Cordova FileTransfer object undefined');
}
window['resolveLocalFileSystemURL'](target, (entry:any) => {
entry.getMetadata((metadata) => {
if (metadata.size > 0) {
this.emit('complete', entry);
} else {
// file empty trigger transfer
this.triggerFileTransfer(source,target);
}
}, () => {
// cannot read metadata trigger transfer
this.triggerFileTransfer(source,target);
});
}, () => {
// file not found, so download it
this.triggerFileTransfer(source,target);
});
return this;
}
cleanup(files:Array<File>, basePath:string) : Promise<void> {
let filesForCleanup = [];
return new Promise<void>((resolve, reject) => {
if (window['resolveLocalFileSystemURL']) {
window['resolveLocalFileSystemURL'](basePath, (entry) => {
let reader = entry.createReader();
reader.readEntries((entries) => {
for (let e of entries) {
if (e && e.isFile) {
if (Util.getFileIndex(files, e.name) < 0) {
filesForCleanup.push(e);
}
}
}
let index = 0;
let error = false;
let cleanupError = (error) => {
this.emit('cleanup-error', error);
reject();
error = true;
};
let cleanupNext = () => {
if (index < filesForCleanup.length && !error) {
filesForCleanup[index].remove(cleanupNext, cleanupError);
index += 1;
} else if (!error) {
this.emit('cleanup-complete', filesForCleanup);
resolve();
}
};
cleanupNext();
}, (error) => { this.emit('cleanup-error', error); reject(); });
});
}
});
}
}