/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.jena.hadoop.rdf.io.input.util;
import java.io.IOException;
import java.io.InputStream;
/**
* A tracked input stream which can is a wrapper around another input stream and
* can report the number of bytes read
*
*
*
*/
public class TrackedInputStream extends TrackableInputStream {
protected InputStream input;
protected long bytesRead = 0, lastMark;
/**
* Creates a new tracked input stream
*
* @param input
* Input stream to track
*/
public TrackedInputStream(InputStream input) {
if (input == null)
throw new NullPointerException("Input cannot be null");
this.input = input;
}
@Override
public int read() throws IOException {
int read = this.input.read();
if (read >= 0)
this.bytesRead++;
return read;
}
@Override
public long getBytesRead() {
return this.bytesRead;
}
@Override
public void close() throws IOException {
this.input.close();
}
@Override
public int available() throws IOException {
return this.input.available();
}
@Override
public synchronized void mark(int readlimit) {
this.input.mark(readlimit);
this.lastMark = this.bytesRead;
}
@Override
public boolean markSupported() {
return this.input.markSupported();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0) return 0;
int read = this.input.read(b, off, len);
if (read > 0)
this.bytesRead += read;
return read;
}
@Override
public int read(byte[] b) throws IOException {
return this.read(b, 0, b.length);
}
@Override
public synchronized void reset() throws IOException {
this.input.reset();
this.bytesRead = this.lastMark;
}
@Override
public long skip(long n) throws IOException {
if (n == 0)
return 0;
long skipped = 0;
byte[] buffer = new byte[16];
int readSize = Math.min(buffer.length, n > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) n);
int read;
do {
if (n - skipped > readSize) {
read = this.input.read(buffer, 0, readSize);
} else {
read = this.input.read(buffer, 0, (int) (n - skipped));
}
if (read > 0) {
this.bytesRead += read;
skipped += read;
}
} while (skipped < n && read >= 0);
return skipped;
}
}