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  /*
   * Copyright 2012 Google Inc.
   * 
   * Licensed 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.
  */
 package elemental.html;
 
 import  elemental.html.*;
 
 import java.util.Date;

The FileReaderSync interface allows to read File or Blob objects in a synchronous way.

This interface is only available in workers as it enables synchronous I/O that could potentially block.

 
 public interface FileReaderSync {


  

This method reads the contents of the specified Blob or File. When the read operation is finished, it returns an ArrayBuffer representing the file's data. If an error happened during the read, the adequate exception is sent.

Parameters

blob
The DOM Blob or File to read into the ArrayBuffer.

Return value

An ArrayBuffer representing the file's data.

Exceptions

The following exceptions can be raised by this method:

NotFoundError
is raised when the resource represented by the DOM Blob or File cannot be found, e. g. because it has been erased.
SecurityError
is raised when one of the following problematic situation is detected:
  • the resource has been modified by a third party;
  • two many read are performed simultaneously;
  • the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableError
is raised when the resource cannot be read due to a permission problem, like a concurrent lock.
EncodingError
is raised when the resource is a data URL and exceed the limit length defined by each browser.
 

This method reads the contents of the specified Blob, which may be a File. When the read operation is finished, it returns a DOMString containing the raw binary data from the file. If an error happened during the read, the adequate exception is sent.

Note : This method is deprecated and readAsArrayBuffer() should be used instead.

Parameters

blob
The DOM Blob or File to read into the DOMString.

Return value

A DOMString containing the raw binary data from the resource

Exceptions

The following exceptions can be raised by this method:

NotFoundError
is raised when the resource represented by the DOM Blob or File cannot be found, e. g. because it has been erased.
SecurityError
is raised when one of the following problematic situation is detected:
  • the resource has been modified by a third party;
  • two many read are performed simultaneously;
  • the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableError
is raised when the resource cannot be read due to a permission problem, like a concurrent lock.
EncodingError
is raised when the resource is a data URL and exceed the limit length defined by each browser.
 
   String readAsBinaryString(Blob blob);


  

This method reads the contents of the specified Blob or File. When the read operation is finished, it returns a data URL representing the file's data. If an error happened during the read, the adequate exception is sent.

Parameters

blob
The DOM Blob or File to read.

Return value

An DOMString representing the file's data as a data URL.

Exceptions

The following exceptions can be raised by this method:

NotFoundError
is raised when the resource represented by the DOM Blob or File cannot be found, e. g. because it has been erased.
SecurityError
is raised when one of the following problematic situation is detected:
  • the resource has been modified by a third party;
  • too many read are performed simultaneously;
  • the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableError
is raised when the resource cannot be read due to a permission problem, like a concurrent lock.
EncodingError
is raised when the resource is a data URL and exceed the limit length defined by each browser.
 
   String readAsDataURL(Blob blob);


  

This methods reads the specified blob's contents. When the read operation is finished, it returns a DOMString containing the file represented as a text string. The optional encoding parameter indicates the encoding to be used. If not present, the method will apply a detection algorithm for it. If an error happened during the read, the adequate exception is sent.

Parameters

blob
The DOM Blob or File to read into the DOMString.
encoding
Optional. A string representing the encoding to be used, like iso-8859-1 or UTF-8.

Return value

A DOMString containing the raw binary data from the resource

Exceptions

The following exceptions can be raised by this method:

NotFoundError
is raised when the resource represented by the DOM Blob or File cannot be found, e. g. because it has been erased.
SecurityError
is raised when one of the following problematic situation is detected:
  • the resource has been modified by a third party;
  • two many read are performed simultaneously;
  • the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableError
is raised when the resource cannot be read due to a permission problem, like a concurrent lock.
 
  String readAsText(Blob blob);


  

This methods reads the specified blob's contents. When the read operation is finished, it returns a DOMString containing the file represented as a text string. The optional encoding parameter indicates the encoding to be used. If not present, the method will apply a detection algorithm for it. If an error happened during the read, the adequate exception is sent.

Parameters

blob
The DOM Blob or File to read into the DOMString.
encoding
Optional. A string representing the encoding to be used, like iso-8859-1 or UTF-8.

Return value

A DOMString containing the raw binary data from the resource

Exceptions

The following exceptions can be raised by this method:

NotFoundError
is raised when the resource represented by the DOM Blob or File cannot be found, e. g. because it has been erased.
SecurityError
is raised when one of the following problematic situation is detected:
  • the resource has been modified by a third party;
  • two many read are performed simultaneously;
  • the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableError
is raised when the resource cannot be read due to a permission problem, like a concurrent lock.
  String readAsText(Blob blobString encoding);
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