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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.pcepio.protocol.ver1;
import java.util.LinkedList;
import java.util.ListIterator;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.pcepio.exceptions.PcepParseException;
import org.onosproject.pcepio.protocol.PcepLabelUpdate;
import org.onosproject.pcepio.protocol.PcepLabelUpdateMsg;
import org.onosproject.pcepio.protocol.PcepMessageReader;
import org.onosproject.pcepio.protocol.PcepMessageWriter;
import org.onosproject.pcepio.protocol.PcepType;
import org.onosproject.pcepio.protocol.PcepVersion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides PCEP lable update message.
*/
class PcepLabelUpdateMsgVer1 implements PcepLabelUpdateMsg {
// Pcep version: 1
/*
The format of the PCLabelUpd message:
<PCLabelUpd Message> ::= <Common Header>
<pce-label-update-list>
Where:
<pce-label-update-list> ::= <pce-label-update>
[<pce-label-update-list>]
<pce-label-update> ::= (<pce-label-download>|<pce-label-map>)
Where:
<pce-label-download> ::= <SRP>
<LSP>
<label-list>
<pce-label-map> ::= <SRP>
<LABEL>
<FEC>
<label-list > ::= <LABEL>
[<label-list>]
*/
protected static final Logger log = LoggerFactory.getLogger(PcepLabelUpdateMsgVer1.class);
public static final byte PACKET_VERSION = 1;
//LabelUpdateMsgMinLength = COMMON-HEADER(4)+SrpObjMinLentgh(12)+LabelObjectMinLength(12)+FECType1Object(8)
public static final int PACKET_MINIMUM_LENGTH = 36;
public static final PcepType MSG_TYPE = PcepType.LABEL_UPDATE;
//pce-label-update-list
private LinkedList<PcepLabelUpdate> llPcLabelUpdateList;
static final PcepLabelUpdateMsgVer1.Reader READER = new Reader();
/**
* Reader reads LabelUpdate Message from the channel.
*/
static class Reader implements PcepMessageReader<PcepLabelUpdateMsg> {
@Override
public PcepLabelUpdateMsg readFrom(ChannelBuffer cb) throws PcepParseException {
if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException("Readable bytes are less than Packet minimum length.");
}
// fixed value property version == 1
byte version = cb.readByte();
version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG);
if (version != PACKET_VERSION) {
throw new PcepParseException("Wrong version.Expected=PcepVersion.PCEP_1(1), got=" + version);
}
// fixed value property type == 13
byte type = cb.readByte();
if (type != MSG_TYPE.getType()) {
throw new PcepParseException("Wrong type. Expected=PcepType.LABEL_UPDATE(13), got=" + type);
}
short length = cb.readShort();
if (length < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException("Wrong length. Expected to be >= " + PACKET_MINIMUM_LENGTH + ", is: "
+ length);
}
// parse <pce-label-download> / <pce-label-map>
LinkedList<PcepLabelUpdate> llPcLabelUpdateList = parsePcLabelUpdateList(cb);
return new PcepLabelUpdateMsgVer1(llPcLabelUpdateList);
}
/**
* Returns list of PCEP Label Update object.
*
* @param cb of type channel buffer
* @return llPcLabelUpdateList list of PCEP label update object
* @throws PcepParseException when fails to parse list of PCEP label update object
*/
public LinkedList<PcepLabelUpdate> parsePcLabelUpdateList(ChannelBuffer cb) throws PcepParseException {
LinkedList<PcepLabelUpdate> llPcLabelUpdateList;
llPcLabelUpdateList = new LinkedList<>();
while (0 < cb.readableBytes()) {
llPcLabelUpdateList.add(PcepLabelUpdateVer1.read(cb));
}
return llPcLabelUpdateList;
}
}
/**
* Constructor to initialize PCEP Label Update List.
*
* @param llPcLabelUpdateList list of PCEP Label Update object
*/
PcepLabelUpdateMsgVer1(LinkedList<PcepLabelUpdate> llPcLabelUpdateList) {
this.llPcLabelUpdateList = llPcLabelUpdateList;
}
/**
* Builder class for PCEP label update message.
*/
static class Builder implements PcepLabelUpdateMsg.Builder {
LinkedList<PcepLabelUpdate> llPcLabelUpdateList;
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return PcepType.LABEL_UPDATE;
}
@Override
public PcepLabelUpdateMsg build() {
return new PcepLabelUpdateMsgVer1(this.llPcLabelUpdateList);
}
@Override
public LinkedList<PcepLabelUpdate> getPcLabelUpdateList() {
return this.llPcLabelUpdateList;
}
@Override
public Builder setPcLabelUpdateList(LinkedList<PcepLabelUpdate> ll) {
this.llPcLabelUpdateList = ll;
return this;
}
}
@Override
public void writeTo(ChannelBuffer cb) throws PcepParseException {
WRITER.write(cb, this);
}
static final Writer WRITER = new Writer();
/**
* Writer writes LabelUpdate Message to the channel.
*/
static class Writer implements PcepMessageWriter<PcepLabelUpdateMsgVer1> {
@Override
public void write(ChannelBuffer cb, PcepLabelUpdateMsgVer1 message) throws PcepParseException {
int startIndex = cb.writerIndex();
// first 3 bits set to version
cb.writeByte((byte) (PACKET_VERSION << PcepMessageVer1.SHIFT_FLAG));
// message type
cb.writeByte(MSG_TYPE.getType());
// Length will be set after calculating length, but currently set it as 0.
int msgLenIndex = cb.writerIndex();
cb.writeShort((short) 0);
ListIterator<PcepLabelUpdate> listIterator = message.llPcLabelUpdateList.listIterator();
while (listIterator.hasNext()) {
PcepLabelUpdate labelUpdate = listIterator.next();
labelUpdate.write(cb);
}
// update message length field
int length = cb.writerIndex() - startIndex;
cb.setShort(msgLenIndex, (short) length);
}
}
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return MSG_TYPE;
}
@Override
public LinkedList<PcepLabelUpdate> getPcLabelUpdateList() {
return this.llPcLabelUpdateList;
}
@Override
public void setPcLabelUpdateList(LinkedList<PcepLabelUpdate> ll) {
this.llPcLabelUpdateList = ll;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("PcLabelUpdateList", llPcLabelUpdateList)
.toString();
}
}
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