Mega Code Archive
Random input stream
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/*
* Copyright WizTools.org
* Licensed under the Apache License, Version 2.0:
* http://www.apache.org/licenses/LICENSE-2.0
*/
//package org.wiztools.commons;
import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
/**
* Originally written by Elliotte Rusty Harold for the book Java I/O 2nd edition.
* @author subwiz
*/
public class RandomInputStream extends InputStream {
private Random generator = new Random();
private boolean closed = false;
@Override
public int read() throws IOException {
checkOpen();
int result = generator.nextInt() % 256;
if (result < 0) {
result = -result;
}
return result;
}
@Override
public int read(byte[] data, int offset, int length) throws IOException {
checkOpen();
byte[] temp = new byte[length];
generator.nextBytes(temp);
System.arraycopy(temp, 0, data, offset, length);
return length;
}
@Override
public int read(byte[] data) throws IOException {
checkOpen();
generator.nextBytes(data);
return data.length;
}
@Override
public long skip(long bytesToSkip) throws IOException {
checkOpen();
// It's all random so skipping has no effect.
return bytesToSkip;
}
@Override
public void close() {
this.closed = true;
}
private void checkOpen() throws IOException {
if (closed) {
throw new IOException("Input stream closed");
}
}
@Override
public int available() {
// Limited only by available memory and the size of an array.
return Integer.MAX_VALUE;
}
}
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