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RandomByteIterator.java
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Tue, Jul 23, 05:43

RandomByteIterator.java
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/**
* Copyright (c) 2010-2016 Yahoo! Inc., 2017 YCSB contributors All rights reserved.
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb;
import java.util.concurrent.ThreadLocalRandom;
/**
* A ByteIterator that generates a random sequence of bytes.
*/
public class RandomByteIterator extends ByteIterator {
private long len;
private long off;
private int bufOff;
private byte[] buf;
@Override
public boolean hasNext() {
return (off + bufOff) < len;
}
private void fillBytesImpl(byte[] buffer, int base) {
int bytes = ThreadLocalRandom.current().nextInt();
switch (buffer.length - base) {
default:
buffer[base + 5] = (byte) (((bytes >> 25) & 95) + ' ');
case 5:
buffer[base + 4] = (byte) (((bytes >> 20) & 63) + ' ');
case 4:
buffer[base + 3] = (byte) (((bytes >> 15) & 31) + ' ');
case 3:
buffer[base + 2] = (byte) (((bytes >> 10) & 95) + ' ');
case 2:
buffer[base + 1] = (byte) (((bytes >> 5) & 63) + ' ');
case 1:
buffer[base + 0] = (byte) (((bytes) & 31) + ' ');
case 0:
break;
}
}
private void fillBytes() {
if (bufOff == buf.length) {
fillBytesImpl(buf, 0);
bufOff = 0;
off += buf.length;
}
}
public RandomByteIterator(long len) {
this.len = len;
this.buf = new byte[6];
this.bufOff = buf.length;
fillBytes();
this.off = 0;
}
public byte nextByte() {
fillBytes();
bufOff++;
return buf[bufOff - 1];
}
@Override
public int nextBuf(byte[] buffer, int bufOffset) {
int ret;
if (len - off < buffer.length - bufOffset) {
ret = (int) (len - off);
} else {
ret = buffer.length - bufOffset;
}
int i;
for (i = 0; i < ret; i += 6) {
fillBytesImpl(buffer, i + bufOffset);
}
off += ret;
return ret + bufOffset;
}
@Override
public long bytesLeft() {
return len - off - bufOff;
}
@Override
public void reset() {
off = 0;
}
}

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