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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.bgpio.protocol;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BgpParseException;
import org.onosproject.bgpio.protocol.ver4.BgpFactoryVer4;
import org.onosproject.bgpio.types.BgpHeader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Abstraction to provide the version for BGP.
*/
public final class BgpFactories {
protected static final Logger log = LoggerFactory.getLogger(BgpFactories.class);
private static final GenericReader GENERIC_READER = new GenericReader();
private BgpFactories() {
}
/**
* Returns the instance of BGP Version.
*
* @param version BGP version
* @return BGP version
*/
public static BgpFactory getFactory(BgpVersion version) {
switch (version) {
case BGP_4:
return BgpFactoryVer4.INSTANCE;
default:
throw new IllegalArgumentException("[BgpFactory:]Unknown version: " + version);
}
}
/**
* Reader class for reading BGP messages from channel buffer.
*
*/
private static class GenericReader implements BgpMessageReader<BgpMessage> {
@Override
public BgpMessage readFrom(ChannelBuffer bb, BgpHeader bgpHeader)
throws BgpParseException {
BgpFactory factory;
if (!bb.readable()) {
log.error("Empty message received");
throw new BgpParseException("Empty message received");
}
// TODO: Currently only BGP version 4 is supported
factory = org.onosproject.bgpio.protocol.ver4.BgpFactoryVer4.INSTANCE;
return factory.getReader().readFrom(bb, bgpHeader);
}
}
/**
* Returns BGP messsage generic reader.
*
* @return bgp message generic reader
*/
public static BgpMessageReader<BgpMessage> getGenericReader() {
return GENERIC_READER;
}
}
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