/**
* Parse TE List from the channel buffer.
*
* @param cb of type channel buffer
* @throws PcepParseException if mandatory fields are missing
*/
public void parseTEList(ChannelBuffer cb) throws PcepParseException {
byte yObjClass;
byte yObjType;
llTEObjList = new LinkedList<PcepTEObject>();
// caller should verify for TE object
if (cb.readableBytes() < OBJECT_HEADER_LENGTH) {
log.debug("Unable to find TE Object");
return;
}
cb.markReaderIndex();
PcepObjectHeader tempObjHeader = PcepObjectHeader.read(cb);
cb.resetReaderIndex();
yObjClass = tempObjHeader.getObjClass();
yObjType = tempObjHeader.getObjType();
PcepTEObject teObj;
while ((yObjClass == PcepTEObjectVer1.TE_OBJ_CLASS)
&& ((yObjType == PcepTEObjectVer1.TE_OBJ_TYPE_NODE_VALUE)
|| (yObjType == PcepTEObjectVer1.TE_OBJ_TYPE_LINK_VALUE))) {
teObj = PcepTEObjectVer1.read(cb);
llTEObjList.add(teObj);
if (cb.readableBytes() > OBJECT_HEADER_LENGTH) {
cb.markReaderIndex();
tempObjHeader = PcepObjectHeader.read(cb);
cb.resetReaderIndex();
yObjClass = tempObjHeader.getObjClass();
yObjType = tempObjHeader.getObjType();
} else {
break;
}
}
}
/**
* Reads the byte stream of PcepError from channel buffer.
*
* @param cb of type channel buffer
* @return PcepError error part of PCEP-ERROR
* @throws PcepParseException if mandatory fields are missing
*/
public static PcepErrorVer1 read(ChannelBuffer cb) throws PcepParseException {
if (cb.readableBytes() < OBJECT_HEADER_LENGTH) {
throw new PcepParseException("Unknown Object");
}
PcepErrorVer1 pcepError = new PcepErrorVer1();
// check whether any PCEP Error Info is present
cb.markReaderIndex();
PcepObjectHeader tempObjHeader = PcepObjectHeader.read(cb);
cb.resetReaderIndex();
byte yObjClass = tempObjHeader.getObjClass();
// If RPlist present then store it.RPList and TEList are optional
if (yObjClass == PcepRPObjectVer1.RP_OBJ_CLASS) {
log.debug("RP_LIST");
pcepError.parseRPList(cb);
yObjClass = checkNextObject(cb);
} else if (yObjClass == PcepTEObjectVer1.TE_OBJ_CLASS) {
log.debug("TE_LIST");
pcepError.parseTEList(cb);
yObjClass = checkNextObject(cb);
}
if (yObjClass == PcepErrorObjectVer1.ERROR_OBJ_CLASS) {
log.debug("PCEP-ERROR obj list");
pcepError.parseErrObjList(cb);
yObjClass = checkNextObject(cb);
}
return pcepError;
}
/**
* Checks Next Object.
*
* @param cb of type channel buffer.
* @return object type class.
*/
private static byte checkNextObject(ChannelBuffer cb) {
if (cb.readableBytes() < OBJECT_HEADER_LENGTH) {
return 0;
}
cb.markReaderIndex();
PcepObjectHeader tempObjHeader = PcepObjectHeader.read(cb);
cb.resetReaderIndex();
return tempObjHeader.getObjClass();
}
/**
* parseErrObjList from the channel buffer.
*
* @param cb of type channel buffer
* @throws PcepParseException if mandatory fields are missing
*/
public void parseErrObjList(ChannelBuffer cb) throws PcepParseException {
byte yObjClass;
byte yObjType;
boolean bIsErrorObjFound = false;
llErrObjList = new LinkedList<PcepErrorObject>();
// caller should verify for RP object
if (cb.readableBytes() < OBJECT_HEADER_LENGTH) {
throw new PcepParseException("Unable to find PCEP-ERROR Object");
}
cb.markReaderIndex();
PcepObjectHeader tempObjHeader = PcepObjectHeader.read(cb);
cb.resetReaderIndex();
yObjClass = tempObjHeader.getObjClass();
yObjType = tempObjHeader.getObjType();
PcepErrorObject errorObject;
while ((yObjClass == PcepErrorObjectVer1.ERROR_OBJ_CLASS)
&& (yObjType == PcepErrorObjectVer1.ERROR_OBJ_TYPE)) {
errorObject = PcepErrorObjectVer1.read(cb);
llErrObjList.add(errorObject);
bIsErrorObjFound = true;
if (cb.readableBytes() > OBJECT_HEADER_LENGTH) {
cb.markReaderIndex();
tempObjHeader = PcepObjectHeader.read(cb);
cb.resetReaderIndex();
yObjClass = tempObjHeader.getObjClass();
yObjType = tempObjHeader.getObjType();
} else {
break;
}
}
if (!bIsErrorObjFound) {
throw new PcepParseException("At least one PCEP-ERROR Object should be present.");
}
}
/**
* Parse channel buffer and returns object of PcepLspObject.
*
* @param cb of type channel buffer
* @return object of PcepLspObject
* @throws PcepParseException when lsp object is not present in channel buffer
*/
public static PcepLspObject read(ChannelBuffer cb) throws PcepParseException {
PcepObjectHeader lspObjHeader;
int iPlspId;
// 3-bits
byte yOFlag;
boolean bAFlag;
boolean bRFlag;
boolean bSFlag;
boolean bDFlag;
boolean bCFlag;
// Optional TLV
LinkedList<PcepValueType> llOptionalTlv = new LinkedList<>();
lspObjHeader = PcepObjectHeader.read(cb);
if (lspObjHeader.getObjClass() != PcepLspObjectVer1.LSP_OBJ_CLASS) {
throw new PcepParseException(
PcepErrorDetailInfo.ERROR_TYPE_6, PcepErrorDetailInfo.ERROR_VALUE_8);
}
// take only LspObject buffer.
ChannelBuffer tempCb = cb.readBytes(lspObjHeader.getObjLen() - OBJECT_HEADER_LENGTH);
Integer iTemp = tempCb.readInt();
iPlspId = (iTemp & PLSPID_TEMP_SHIFT_VALUE) >> PLSPID_SHIFT_VALUE;
bCFlag = ((iTemp & CFLAG_TEMP_SHIFT_VALUE) >> CFLAG_SHIFT_VALUE) > 0;
Integer iX = (iTemp & OFLAG_TEMP_SHIFT_VALUE) >> OFLAG_SHIFT_VALUE;
yOFlag = iX.byteValue();
iX = (iTemp & AFLAG_TEMP_SHIFT_VALUE) >> AFLAG_SHIFT_VALUE;
bAFlag = iX > 0;
iX = (iTemp & RFLAG_TEMP_SHIFT_VALUE) >> RFLAG_SHIFT_VALUE;
bRFlag = iX > 0;
iX = (iTemp & SFLAG_TEMP_SHIFT_VALUE) >> SFLAG_SHIFT_VALUE;
bSFlag = iX > 0;
iX = iTemp & DFLAG_TEMP_SHIFT_VALUE;
bDFlag = iX > 0;
// parse optional TLV
llOptionalTlv = parseOptionalTlv(tempCb);
return new PcepLspObjectVer1(
lspObjHeader, iPlspId, yOFlag, bAFlag, bRFlag, bSFlag, bDFlag, bCFlag, llOptionalTlv);
}