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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.onlab.packet.pim;
import org.onlab.packet.BasePacket;
import org.onlab.packet.Deserializer;
import org.onlab.packet.IPacket;
import org.onlab.packet.IpAddress;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import static org.onlab.packet.PacketUtils.checkInput;
public class PIMHello extends BasePacket {
private IpAddress nbrIpAddress;
private boolean priorityPresent = false;
private Map<Short, PIMHelloOption> options = new HashMap<>();
/**
* Create a PIM Hello packet with the most common hello options and default
* values. The values of any options can be easily changed by modifying the value of
* the option with the desired change.
*/
public void createDefaultOptions() {
options.put(PIMHelloOption.OPT_HOLDTIME, new PIMHelloOption(PIMHelloOption.OPT_HOLDTIME));
options.put(PIMHelloOption.OPT_PRIORITY, new PIMHelloOption(PIMHelloOption.OPT_PRIORITY));
options.put(PIMHelloOption.OPT_GENID, new PIMHelloOption(PIMHelloOption.OPT_GENID));
}
/**
* Add a PIM Hello option to this hello message. Note
*
* @param opt the PIM Hello option we are adding
*/
public void addOption(PIMHelloOption opt) {
this.options.put(opt.getOptType(), opt);
}
public Map<Short, PIMHelloOption> getOptions() {
return this.options;
}
/**
* Sets all payloads parent packet if applicable, then serializes this
* packet and all payloads.
*
* @return a byte[] containing this packet and payloads
*/
@Override
public byte[] serialize() {
int totalLen = 0;
// Since we are likely to only have 3-4 options, go head and walk the
// hashmap twice, once to calculate the space needed to allocate a
// buffer, the second time serialize the options into the buffer. This
// saves us from allocating an over sized buffer the re-allocating and
// copying.
for (Short optType : options.keySet()) {
PIMHelloOption opt = options.get(optType);
totalLen += PIMHelloOption.MINIMUM_OPTION_LEN_BYTES + opt.getOptLength();
}
byte[] data = new byte[totalLen];
ByteBuffer bb = ByteBuffer.wrap(data);
// Now serialize the data.
for (Short optType : options.keySet()) {
PIMHelloOption opt = options.get(optType);
bb.put(opt.serialize());
}
return data;
}
/**
* XXX: This is deprecated, DO NOT USE, use the deserializer() function instead.
*/
public IPacket deserialize(final byte[] data, final int offset,
final int length) {
// TODO: throw an expection?
return null;
}
/**
* Deserialize this hello message.
*
* @return a deserialized hello message
*/
public static Deserializer<PIMHello> deserializer() {
return (data, offset, length) -> {
checkInput(data, offset, length, PIMHelloOption.MINIMUM_OPTION_LEN_BYTES);
final ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
PIMHello hello = new PIMHello();
while (bb.hasRemaining()) {
PIMHelloOption opt = PIMHelloOption.deserialize(bb);
hello.addOption(opt);
}
return hello;
};
}
}
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