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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 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.PcepOpenMsg;
import org.onosproject.pcepio.protocol.PcepOpenObject;
import org.onosproject.pcepio.protocol.PcepType;
import org.onosproject.pcepio.protocol.PcepVersion;
import org.onosproject.pcepio.types.PcepErrorDetailInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides PCEP open message.
*/
public class PcepOpenMsgVer1 implements PcepOpenMsg {
/*
* <Open Message>::= <Common Header> <OPEN>
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ver | Flags | Message-Type | Message-Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Object-Class | OT |Res|P|I| Object Length (bytes) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ver | Flags | Keepalive | DeadTimer | SID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
// Optional TLVs //
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
protected static final Logger log = LoggerFactory.getLogger(PcepOpenMsgVer1.class);
public static final byte PACKET_VERSION = 1;
public static final int PACKET_MINIMUM_LENGTH = 12;
public static final PcepType MSG_TYPE = PcepType.OPEN;
private PcepOpenObject pcepOpenObj;
public static final PcepOpenMsgVer1.Reader READER = new Reader();
/**
* Constructor to initialize PcepOpenObject.
*
* @param pcepOpenObj PCEP-OPEN-OBJECT
*/
public PcepOpenMsgVer1(PcepOpenObject pcepOpenObj) {
this.pcepOpenObj = pcepOpenObj;
}
@Override
public PcepOpenObject getPcepOpenObject() {
return this.pcepOpenObj;
}
@Override
public void setPcepOpenObject(PcepOpenObject pcepOpenObj) {
this.pcepOpenObj = pcepOpenObj;
}
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return MSG_TYPE;
}
/**
* Reader class for reading PCEP open message from channel buffer.
*/
public static class Reader implements PcepMessageReader<PcepOpenMsg> {
@Override
public PcepOpenMsg readFrom(ChannelBuffer cb) throws PcepParseException {
if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException("Packet size is less than the minimum length.");
}
byte version = cb.readByte();
version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG);
if (version != PACKET_VERSION) {
log.error("[readFrom] Invalid version: " + version);
throw new PcepParseException(PcepErrorDetailInfo.ERROR_TYPE_1, PcepErrorDetailInfo.ERROR_VALUE_1);
}
// fixed value property type == 1
byte type = cb.readByte();
if (type != MSG_TYPE.getType()) {
log.error("[readFrom] Unexpected type: " + type);
throw new PcepParseException(PcepErrorDetailInfo.ERROR_TYPE_1, PcepErrorDetailInfo.ERROR_VALUE_1);
}
int length = cb.readShort();
if (length < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException(
"Wrong length: Expected to be >= " + PACKET_MINIMUM_LENGTH + ", was: " + length);
}
return new PcepOpenMsgVer1(PcepOpenObjectVer1.read(cb));
}
}
/**
* Builder class for PCEP open message.
*/
static class Builder implements PcepOpenMsg.Builder {
private PcepOpenObject pcepOpenObj;
@Override
public PcepOpenMsg build() throws PcepParseException {
if (!(pcepOpenObj instanceof PcepOpenObjectVer1)) {
throw new NullPointerException("PcepOpenObject is null.");
}
return new PcepOpenMsgVer1(pcepOpenObj);
}
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return PcepType.OPEN;
}
@Override
public PcepOpenObject getPcepOpenObj() {
return this.pcepOpenObj;
}
@Override
public Builder setPcepOpenObj(PcepOpenObject obj) {
this.pcepOpenObj = obj;
return this;
}
}
@Override
public void writeTo(ChannelBuffer cb) throws PcepParseException {
WRITER.write(cb, this);
}
public static final Writer WRITER = new Writer();
/**
* Writer class for writing PCEP opne message to channel buffer.
*/
public static class Writer implements PcepMessageWriter<PcepOpenMsgVer1> {
@Override
public void write(ChannelBuffer cb, PcepOpenMsgVer1 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 is length of variable message, will be updated at the end
// Store the position of message
// length in buffer
int msgLenIndex = cb.writerIndex();
cb.writeShort(0);
message.getPcepOpenObject().write(cb);
// update message length field
int iLength = cb.writerIndex() - startIndex;
cb.setShort(msgLenIndex, (short) iLength);
}
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("OpenObject", pcepOpenObj)
.toString();
}
}
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