/*
* Copyright 2015 MiLaboratory.com
*
* 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 com.milaboratory.util;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Stream that tracks the number of bytes read.
*
* @NotThreadSafe
* @since Apache Commons Compress 1.3
*/
public final class CountingInputStream extends FilterInputStream {
private long bytesRead;
private volatile boolean closed = false;
public CountingInputStream(final InputStream in) {
super(in);
}
@Override
public int read() throws IOException {
int r = in.read();
if (r >= 0) {
count(1);
}
return r;
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int r = in.read(b, off, len);
if (r >= 0) {
count(r);
}
return r;
}
@Override
public void close() throws IOException {
closed = true;
super.close();
}
/**
* Increments the counter of already read bytes. Doesn't increment if the EOF has been hit (read == -1)
*
* @param read the number of bytes read
*/
protected final void count(long read) {
if (read != -1) {
bytesRead += read;
}
}
/**
* Returns the current number of bytes read from this stream.
*
* @return the number of read bytes
*/
public long getBytesRead() {
return bytesRead;
}
public CanReportProgress getProgressReporter(final long totalSize) {
return new CanReportProgress() {
@Override
public double getProgress() {
return 1.0 * bytesRead / totalSize;
}
@Override
public boolean isFinished() {
return bytesRead == totalSize || closed;
}
};
}
}