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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.PcepMessageReader;
import org.onosproject.pcepio.protocol.PcepMessageWriter;
import org.onosproject.pcepio.protocol.PcepTEObject;
import org.onosproject.pcepio.protocol.PcepTEReportMsg;
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 TE Report Message.
*/
class PcepTEReportMsgVer1 implements PcepTEReportMsg {
/*
* Ref : draft-dhodylee-pce-pcep-te-data-extn-02, section 8.1
<TERpt Message> ::= <Common Header>
<te-report-list>
Where:
<te-report-list> ::= <TE>[<te-report-list>]
*/
private static final Logger log = LoggerFactory.getLogger(PcepTEReportMsgVer1.class);
//PACKET_MINIMUM_LENGTH = CommonHeaderLen(4)+TEObjMinLen(12)
public static final int PACKET_MINIMUM_LENGTH = 16;
public static final PcepType MSG_TYPE = PcepType.TE_REPORT;
// <te-report-list>
private LinkedList<PcepTEObject> teReportList;
public static final PcepTEReportMsgVer1.Reader READER = new Reader();
/**
* Reader class for reading PCPE te report message form channel buffer.
*/
static class Reader implements PcepMessageReader<PcepTEReportMsg> {
LinkedList<PcepTEObject> teReportList;
@Override
public PcepTEReportMsg readFrom(ChannelBuffer cb) throws PcepParseException {
if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
return null;
}
teReportList = new LinkedList<>();
byte version = cb.readByte();
version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG);
if (version != PcepMessageVer1.PACKET_VERSION) {
throw new PcepParseException("Wrong version. Expected=PcepVersion.PCEP_1(1), got=" + version);
}
byte type = cb.readByte();
if (type != MSG_TYPE.getType()) {
throw new PcepParseException("Wrong type. Expected=PcepType.TE_REPORT(14), 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 state report list
parseTEReportList(cb);
return new PcepTEReportMsgVer1(teReportList);
}
/**
* Parse te-report-list.
*
* @param cb input Channel Buffer
* @throws PcepParseException when fails to parse TE Report list.
*/
public void parseTEReportList(ChannelBuffer cb) throws PcepParseException {
// <te-report-list> ::= <TE>[<te-report-list>]
while (0 < cb.readableBytes()) {
//store TE objectS
if (!teReportList.add(PcepTEObjectVer1.read(cb))) {
throw new PcepParseException("Failed to add TE object to TE report list");
}
}
}
}
/**
* Constructor to initialize TE Report List.
*
* @param teReportList list of PCEP TE Object
*/
PcepTEReportMsgVer1(LinkedList<PcepTEObject> teReportList) {
this.teReportList = teReportList;
}
/**
* Builder class for PCEP te report message.
*/
static class Builder implements PcepTEReportMsg.Builder {
// PCEP TE Report message fields
LinkedList<PcepTEObject> teReportList;
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return PcepType.TE_REPORT;
}
@Override
public PcepTEReportMsg build() {
return new PcepTEReportMsgVer1(this.teReportList);
}
@Override
public LinkedList<PcepTEObject> getTEReportList() {
return this.teReportList;
}
@Override
public Builder setTEReportList(LinkedList<PcepTEObject> ll) {
this.teReportList = ll;
return this;
}
}
@Override
public void writeTo(ChannelBuffer bb) throws PcepParseException {
WRITER.write(bb, this);
}
static final Writer WRITER = new Writer();
/**
* Writer class for writing PCEP te report message to channel buffer.
*/
static class Writer implements PcepMessageWriter<PcepTEReportMsgVer1> {
@Override
public void write(ChannelBuffer bb, PcepTEReportMsgVer1 message) throws PcepParseException {
int startIndex = bb.writerIndex();
// first 3 bits set to version
bb.writeByte((byte) (PcepMessageVer1.PACKET_VERSION << PcepMessageVer1.SHIFT_FLAG));
// message type
bb.writeByte(MSG_TYPE.getType());
// Length of the message will be updated at the end
// First write with 0s
int msgLenIndex = bb.writerIndex();
bb.writeShort((short) 0);
ListIterator<PcepTEObject> listIterator = message.teReportList.listIterator();
while (listIterator.hasNext()) {
PcepTEObject teObj = listIterator.next();
teObj.write(bb);
}
// update message length field
int length = bb.writerIndex() - startIndex;
bb.setShort(msgLenIndex, (short) length);
}
}
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return MSG_TYPE;
}
@Override
public LinkedList<PcepTEObject> getTEReportList() {
return this.teReportList;
}
@Override
public void setTEReportList(LinkedList<PcepTEObject> ll) {
this.teReportList = ll;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("TeReportList", teReportList)
.toString();
}
}
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