com.box.sdk.ProgressInputStream Maven / Gradle / Ivy
package com.box.sdk;
import java.io.IOException;
import java.io.InputStream;
/**
* An {@link InputStream} that can report the progress of reading from another InputStream to a
* {@link ProgressListener}.
*/
class ProgressInputStream extends InputStream {
private final InputStream stream;
private final ProgressListener listener;
private long total;
private long totalRead;
private int progress;
/**
* Constructs a ProgressInputStream that wraps another InputStream.
* @param stream the stream whose progress will be monitored.
* @param listener the listener that will receive progress updates.
* @param total the total number of bytes that are expected to be read from the stream.
*/
public ProgressInputStream(InputStream stream, ProgressListener listener, long total) {
this.stream = stream;
this.listener = listener;
this.total = total;
}
/**
* Gets the total number of bytes that are expected to be read from the stream.
* @return the total number of bytes.
*/
public long getTotal() {
return this.total;
}
/**
* Sets the total number of bytes that are expected to be read from the stream.
* @param total the total number of bytes
*/
public void setTotal(long total) {
this.total = total;
}
@Override
public void close() throws IOException {
this.stream.close();
}
@Override
public int read() throws IOException {
int read = this.stream.read();
this.totalRead++;
this.listener.onProgressChanged(this.totalRead, this.total);
return read;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int read = this.stream.read(b, off, len);
this.totalRead += read;
this.listener.onProgressChanged(this.totalRead, this.total);
return read;
}
}