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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.PcepLabelRange;
import org.onosproject.pcepio.protocol.PcepLabelRangeResvMsg;
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 label range reserve message.
*/
class PcepLabelRangeResvMsgVer1 implements PcepLabelRangeResvMsg {
// Pcep version: 1
/*
The format of a PCLRResv message is as follows:
PCLRResv Message>::= <Common Header>
<label-range>
Where:
<label-range> ::= <SRP>
<labelrange-list>
Where
<labelrange-list>::=<LABEL-RANGE>[<labelrange-list>]
*/
protected static final Logger log = LoggerFactory.getLogger(PcepLabelRangeResvMsgVer1.class);
public static final byte PACKET_VERSION = 1;
// LabelRangeResvMsgMinLength = COMMON-HEADER(4)+SrpObjMinLentgh(12)+LABEL-RANGE-MIN-LENGTH(12)
public static final int PACKET_MINIMUM_LENGTH = 28;
public static final PcepType MSG_TYPE = PcepType.LABEL_RANGE_RESERV;
//<label-range>
PcepLabelRange labelRange;
public static final PcepLabelRangeResvMsgVer1.Reader READER = new Reader();
/**
* Reader reads LabelRangeResv Message from the channel.
*/
static class Reader implements PcepMessageReader<PcepLabelRangeResvMsg> {
@Override
public PcepLabelRangeResvMsg readFrom(ChannelBuffer cb) throws PcepParseException {
if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException("Channel buffer has less readable bytes 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 == 15
byte type = cb.readByte();
if (type != MSG_TYPE.getType()) {
throw new PcepParseException("Wrong type. Expected=PcepType.LABEL_RANGE_RESERV(15), 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 <label-range>
PcepLabelRange labelRange = PcepLabelRangeVer1.read(cb);
return new PcepLabelRangeResvMsgVer1(labelRange);
}
}
/**
* Constructor to initialize PCEP label range.
*
* @param labelRange PCEP label range
*/
PcepLabelRangeResvMsgVer1(PcepLabelRange labelRange) {
this.labelRange = labelRange;
}
/**
* Builder class for PCEP label range reserve message.
*/
static class Builder implements PcepLabelRangeResvMsg.Builder {
PcepLabelRange labelRange = new PcepLabelRangeVer1();
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return PcepType.LABEL_RANGE_RESERV;
}
@Override
public PcepLabelRangeResvMsg build() {
return new PcepLabelRangeResvMsgVer1(this.labelRange);
}
@Override
public PcepLabelRange getLabelRange() {
return this.labelRange;
}
@Override
public Builder setLabelRange(PcepLabelRange labelRange) {
this.labelRange = labelRange;
return this;
}
}
@Override
public void writeTo(ChannelBuffer cb) throws PcepParseException {
WRITER.write(cb, this);
}
static final Writer WRITER = new Writer();
/**
* Writer writes LabelRangeResv Message to the channel.
*/
static class Writer implements PcepMessageWriter<PcepLabelRangeResvMsgVer1> {
@Override
public void write(ChannelBuffer cb, PcepLabelRangeResvMsgVer1 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);
//write Label Range
message.labelRange.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 PcepLabelRange getLabelRange() {
return this.labelRange;
}
@Override
public void setLabelRange(PcepLabelRange lr) {
this.labelRange = lr;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("labelRange", labelRange)
.toString();
}
}
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