Android Open Source - android-davsync Counting Input Stream Entity

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License

The source code is released under:

Copyright ? 2013, Michael Stapelberg and contributors All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following ...

Java Source Code

// Based on code from Ben Hardill:
// http://www.hardill.me.uk/wordpress/?p=646
package net.zekjur.davsync;
//from w  w  w . j a  va  2 s .  com
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.http.entity.InputStreamEntity;

public class CountingInputStreamEntity extends InputStreamEntity {
  private UploadListener listener;
  private long length;

  public CountingInputStreamEntity(InputStream instream, long length) {
    super(instream, length);
    this.length = length;
  }

  public void setUploadListener(UploadListener listener) {
    this.listener = listener;
  }

  @Override
  public void writeTo(OutputStream outstream) throws IOException {
    super.writeTo(new CountingOutputStream(outstream));
  }

  class CountingOutputStream extends OutputStream {
    private long counter = 0l;
    private int lastPercent = 0;
    private OutputStream outputStream;

    public CountingOutputStream(OutputStream outputStream) {
      this.outputStream = outputStream;
    }

    @Override
    public void write(int oneByte) throws IOException {
      this.outputStream.write(oneByte);
      counter++;
      if (listener != null) {
        int percent = (int) ((counter * 100) / length);
        // NB: We need to call this only when the percentage actually
        // changed, otherwise updating the notification will churn
        // through memory far too quickly.
        if (lastPercent != percent) {
          listener.onChange(percent);
          lastPercent = percent;
        }
      }
    }
  }

  public interface UploadListener {
    public void onChange(int percent);
  }
}

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