/**
* Constructs a new OffsetRandomAccessSource
*
* @param source the source
*/
public GetBufferedRandomAccessSource(RandomAccessSource source) {
this.source = source;
this.getBuffer = new byte[(int) Math.min(Math.max(source.length() / 4, 1), (long) 4096)];
this.getBufferStart = -1;
this.getBufferEnd = -1;
}
/** {@inheritDoc} */
public int get(long position) throws IOException {
if (position < getBufferStart || position > getBufferEnd) {
int count = source.get(position, getBuffer, 0, getBuffer.length);
if (count == -1) return -1;
getBufferStart = position;
getBufferEnd = position + count - 1;
}
int bufPos = (int) (position - getBufferStart);
return 0xff & getBuffer[bufPos];
}
/** Does nothing - the underlying source is not closed */
public void close() throws IOException {
source.close();
getBufferStart = -1;
getBufferEnd = -1;
}
/** {@inheritDoc} */
public long length() {
return source.length();
}
/** {@inheritDoc} */
public int get(long position, byte[] bytes, int off, int len) throws IOException {
return source.get(position, bytes, off, len);
}