@Override
public int read(ByteBuffer dst) throws IOException {
requireOpen();
buffer.limit(0);
wrapped.position(position);
int read = wrapped.read(dst);
if (read > 0) {
position += read;
}
return read;
}
private int ensureBuffer() throws IOException {
if (!buffer.hasRemaining()) {
buffer.clear();
wrapped.read(buffer);
buffer.flip();
}
return buffer.remaining();
}
public BufferedSeekableSource(SeekableSource wrapped) {
super(
ofNullable(wrapped)
.map(SeekableSource::id)
.orElseThrow(
() -> {
return new IllegalArgumentException(
"Input decorated SeekableSource cannot be null");
}));
this.wrapped = wrapped;
this.size = wrapped.size();
this.buffer.limit(0);
}
@Override
public SeekableSource position(long newPosition) throws IOException {
requireArg(newPosition >= 0, "Cannot set position to a negative value");
if (newPosition != this.position) {
long newBufPosition = newPosition - position + buffer.position();
if (newBufPosition >= 0 && newBufPosition < buffer.limit()) {
buffer.position((int) newBufPosition);
} else {
buffer.limit(0);
wrapped.position(newPosition);
}
this.position = Math.min(newPosition, size);
}
return this;
}
@Override
public SeekableSource view(long startingPosition, long length) throws IOException {
requireOpen();
return new BufferedSeekableSource(wrapped.view(startingPosition, length));
}
