Mega Code Archive
InputStream that notifies listeners of its progress
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//package net.javalib.flickr.search.util;
import java.io.IOException;
import java.io.InputStream;
/**
* InputStream that notifies listeners of its progress.
*/
public class ProgressAwareInputStream extends InputStream {
private InputStream wrappedInputStream;
private long size;
private Object tag;
private long counter;
private long lastPercent;
private OnProgressListener listener;
public ProgressAwareInputStream(InputStream in, long size, Object tag) {
wrappedInputStream = in;
this.size = size;
this.tag = tag;
}
public void setOnProgressListener(OnProgressListener listener) { this.listener = listener; }
public Object getTag() { return tag; }
@Override
public int read() throws IOException {
counter += 1;
check();
return wrappedInputStream.read();
}
@Override
public int read(byte[] b) throws IOException {
int retVal = wrappedInputStream.read(b);
counter += retVal;
check();
return retVal;
}
@Override
public int read(byte[] b, int offset, int length) throws IOException {
int retVal = wrappedInputStream.read(b, offset, length);
counter += retVal;
check();
return retVal;
}
private void check() {
int percent = (int) ( counter * 100 / size );
if (percent - lastPercent >= 10) {
lastPercent = percent;
if (listener != null)
listener.onProgress(percent, tag);
}
}
@Override
public void close() throws IOException { wrappedInputStream.close(); }
@Override
public int available() throws IOException { return wrappedInputStream.available(); }
@Override
public void mark(int readlimit) { wrappedInputStream.mark(readlimit); }
@Override
public synchronized void reset() throws IOException { wrappedInputStream.reset(); }
@Override
public boolean markSupported() { return wrappedInputStream.markSupported(); }
@Override
public long skip(long n) throws IOException { return wrappedInputStream.skip(n); }
/**
* Interface for classes that want to monitor this input stream
*/
public interface OnProgressListener {
void onProgress(int percentage, Object tag);
}
}
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