package snap.webapi;

/**

* This class is a wrapper for Web API FileReader (https://developer.mozilla.org/en-US/docs/Web/API/FileReader).

*/

public class FileReader extends JSProxy implements EventTarget {

/**

* Constructor.

*/

public FileReader()

{

super(WebEnv.get().newFileReaderJS());

}

/**

* Starts reading the contents of a specified Blob or File.

* When the read operation is finished, the readyState becomes DONE, and the loadend is triggered.

* At that time, the result attribute contains an ArrayBuffer representing the file's data.

*/

public void readAsArrayBuffer(Blob aBlob)

{

call("readAsArrayBuffer", aBlob._jsObj);

}

/**

* Returns the bytes.

*/

public byte[] getResultBytes()

{

Object arrayBufferJS = getMember("result");

ArrayBuffer arrayBuffer = new ArrayBuffer(arrayBufferJS);

return arrayBuffer.getBytes();

}

/**

* readBytesAndWait

*/

public void readBytesAndRunLater(Blob aBlob, Runnable aRun)

{

addEventListener("loadend", e -> aRun.run());

readAsArrayBuffer(aBlob);

}

}