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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.PcepLabelRange;
import org.onosproject.pcepio.protocol.PcepLabelRangeObject;
import org.onosproject.pcepio.protocol.PcepSrpObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides PCEP Label Range.
*/
public class PcepLabelRangeVer1 implements PcepLabelRange {
protected static final Logger log = LoggerFactory.getLogger(PcepLabelRangeVer1.class);
/*
<label-range> ::= <SRP>
<labelrange-list>
Where
<labelrange-list>::=<LABEL-RANGE>[<labelrange-list>]
*/
// PCEP SRP Object
private PcepSrpObject srpObject;
//<labelrange-list> of type PcepLabelRangeObject.
private LinkedList<PcepLabelRangeObject> llLabelRangeList;
/**
* Default Constructor.
*/
public PcepLabelRangeVer1() {
srpObject = null;
llLabelRangeList = null;
}
/**
* Constructor to initialize objects.
*
* @param srpObj PCEP Srp object.
* @param llLabelRangeList list of PcepLabelRangeObject.
*/
PcepLabelRangeVer1(PcepSrpObject srpObj, LinkedList<PcepLabelRangeObject> llLabelRangeList) {
this.srpObject = srpObj;
this.llLabelRangeList = llLabelRangeList;
}
@Override
public PcepSrpObject getSrpObject() {
return srpObject;
}
@Override
public void setSrpObject(PcepSrpObject srpObject) {
this.srpObject = srpObject;
}
@Override
public LinkedList<PcepLabelRangeObject> getLabelRangeList() {
return llLabelRangeList;
}
@Override
public void setLabelRangeList(LinkedList<PcepLabelRangeObject> ll) {
this.llLabelRangeList = ll;
}
/**
* Reads channel buffer and returns object of PcepLabelRange.
*
* @param cb of type channel buffer.
* @return object of PcepLabelRange
* @throws PcepParseException when fails to read from channel buffer
*/
public static PcepLabelRange read(ChannelBuffer cb) throws PcepParseException {
//parse and store SRP mandatory object
PcepSrpObject srpObj = null;
srpObj = PcepSrpObjectVer1.read(cb);
if (srpObj == null) {
throw new PcepParseException("Exception while parsing srp object");
}
LinkedList<PcepLabelRangeObject> llLabelRangeList = new LinkedList<>();
boolean bFoundLabelRangeObj = false;
while (0 < cb.readableBytes()) {
//parse and store <labelrange-list>
PcepLabelRangeObject lrObj;
lrObj = PcepLabelRangeObjectVer1.read(cb);
if (lrObj == null) {
throw new PcepParseException("Exception while parsing label range object");
} else {
llLabelRangeList.add(lrObj);
bFoundLabelRangeObj = true;
}
}
if (!bFoundLabelRangeObj) {
throw new PcepParseException("At least one LABEL-RANGE MUST be present.");
}
return new PcepLabelRangeVer1(srpObj, llLabelRangeList);
}
@Override
public int write(ChannelBuffer cb) throws PcepParseException {
//write Object header
int objStartIndex = cb.writerIndex();
//write <SRP>
int objLenIndex = srpObject.write(cb);
if (objLenIndex <= 0) {
throw new PcepParseException("bjectLength is " + objLenIndex);
}
//write <labelrange-list>
ListIterator<PcepLabelRangeObject> listIterator = llLabelRangeList.listIterator();
while (listIterator.hasNext()) {
listIterator.next().write(cb);
}
//Update object length now
int length = cb.writerIndex() - objStartIndex;
// As per RFC the length of object should be
// multiples of 4
int pad = length % 4;
if (pad != 0) {
pad = 4 - pad;
for (int i = 0; i < pad; i++) {
cb.writeByte((byte) 0);
}
length = length + pad;
}
cb.setShort(objLenIndex, (short) length);
return length;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("srpObject", srpObject)
.add("LabelRangeList", llLabelRangeList)
.toString();
}
}
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