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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.fs4;
import java.nio.ByteBuffer;
import java.util.Iterator;
/**
* Provides sequential access to each byte of a buffer
* as a hexadecimal string of length 2.
*
* @author Tony Vaagenes
*/
public final class HexByteIterator implements Iterator<String> {
private final ByteBuffer buffer;
private String hexByte(byte b) {
final int unsignedValue = ((int)b) & 0xff;
String s = Integer.toHexString(unsignedValue).toUpperCase();
boolean singleChar = unsignedValue < 0x10;
if (singleChar)
return '0' + s;
else
return s;
}
public boolean hasNext() {
return buffer.hasRemaining();
}
public String next() {
return hexByte(buffer.get());
}
public void remove() {
throw new UnsupportedOperationException();
}
public HexByteIterator(ByteBuffer buffer) {
this.buffer = buffer.slice();
}
}
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