/// <summary>
/// Continue to read data until the end of an element, then call
/// elementListener.onReceivedElement(element ). The buffer passed to
/// onReceivedElement is only valid during this call. If you need the data
/// later, you must copy.
/// </summary>
///
/// <param name="data"></param>
/// <exception cref="EncodingException">For invalid encoding.</exception>
public void onReceivedData(ByteBuffer data)
{
// We may repeatedly set data to a slice as we read elements.
data = data.slice();
// Process multiple objects in the data.
while (true) {
bool gotElementEnd;
int offset;
try {
if (!usePartialData_) {
// This is the beginning of an element.
if (data.remaining() <= 0)
// Wait for more data.
return;
}
// Scan the input to check if a whole TLV object has been read.
tlvStructureDecoder_.seek(0);
gotElementEnd = tlvStructureDecoder_.findElementEnd(data);
offset = tlvStructureDecoder_.getOffset();
} catch (EncodingException ex) {
// Reset to read a new element on the next call.
usePartialData_ = false;
tlvStructureDecoder_ = new TlvStructureDecoder();
throw ex;
}
if (gotElementEnd) {
// Got the remainder of an element. Report to the caller.
ByteBuffer element;
if (usePartialData_) {
// We have partial data from a previous call, so append this data and point to partialData.
partialData_.ensuredPut(data, 0, offset);
element = partialData_.flippedBuffer();
// Assume we don't need to use partialData anymore until needed.
usePartialData_ = false;
} else {
// We are not using partialData, so just point to the input data buffer.
element = data.duplicate();
element.limit(offset);
}
// Reset to read a new object. Do this before calling onReceivedElement
// in case it throws an exception.
data.position(offset);
data = data.slice();
tlvStructureDecoder_ = new TlvStructureDecoder();
elementListener_.onReceivedElement(element);
if (data.remaining() <= 0)
// No more data in the packet.
return;
// else loop back to decode.
} else {
// Save remaining data for a later call.
if (!usePartialData_) {
usePartialData_ = true;
partialData_.position(0);
}
if (partialData_.buffer().position() + data.remaining() > net.named_data.jndn.util.Common.MAX_NDN_PACKET_SIZE) {
// Reset to read a new element on the next call.
usePartialData_ = false;
tlvStructureDecoder_ = new TlvStructureDecoder();
throw new EncodingException(
"The incoming packet exceeds the maximum limit Face.getMaxNdnPacketSize()");
}
partialData_.ensuredPut(data);
return;
}
}
}
/// <summary>
/// Create a new ElementReader with the elementListener.
/// </summary>
///
/// <param name="elementListener">The ElementListener used by onReceivedData.</param>
public ElementReader(ElementListener elementListener)
{
this.tlvStructureDecoder_ = new TlvStructureDecoder();
this.partialData_ = new DynamicByteBuffer(1000);
elementListener_ = elementListener;
}
