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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.types;
import java.util.Objects;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BGPParseException;
import org.onosproject.bgpio.util.Validation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides Implementation of Med BGP Path Attribute.
*/
public class Med implements BGPValueType {
private static final Logger log = LoggerFactory.getLogger(Med.class);
public static final byte MED_TYPE = 4;
public static final int TYPE_AND_LEN_AS_SHORT = 4;
public static final int TYPE_AND_LEN_AS_BYTE = 3;
public static final byte MED_MAX_LEN = 4;
private int med;
/**
* Constructor to initialize med.
*
* @param med MULTI_EXIT_DISC value
*/
public Med(int med) {
this.med = med;
}
/**
* Returns Med value.
*
* @return Med value
*/
public int med() {
return this.med;
}
/**
* Reads the channel buffer and returns object of Med.
*
* @param cb ChannelBuffer
* @return object of Med
* @throws BGPParseException while parsing Med path attribute
*/
public static Med read(ChannelBuffer cb) throws BGPParseException {
int med;
ChannelBuffer tempCb = cb.copy();
Validation parseFlags = Validation.parseAttributeHeader(cb);
if ((parseFlags.getLength() > MED_MAX_LEN) || cb.readableBytes() < parseFlags.getLength()) {
Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_LENGTH_ERROR,
parseFlags.getLength());
}
int len = parseFlags.isShort() ? parseFlags.getLength() + TYPE_AND_LEN_AS_SHORT : parseFlags
.getLength() + TYPE_AND_LEN_AS_BYTE;
ChannelBuffer data = tempCb.readBytes(len);
if (!parseFlags.getFirstBit() && parseFlags.getSecondBit() && parseFlags.getThirdBit()) {
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_FLAGS_ERROR, data);
}
med = cb.readInt();
return new Med(med);
}
@Override
public short getType() {
return MED_TYPE;
}
@Override
public int hashCode() {
return Objects.hash(med);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof Med) {
Med other = (Med) obj;
return Objects.equals(med, other.med);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("med", med)
.toString();
}
@Override
public int write(ChannelBuffer cb) {
//Not to implement as of now
return 0;
}
}
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