| /* |
| * 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.Constants; |
| import org.onosproject.bgpio.util.Validation; |
| |
| import com.google.common.base.MoreObjects; |
| |
| /** |
| * Provides Implementation of Med BGP Path Attribute. |
| */ |
| public class Med implements BgpValueType { |
| public static final byte MED_TYPE = 4; |
| public static final byte MED_MAX_LEN = 4; |
| public static final byte FLAGS = (byte) 0x80; |
| |
| 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() + Constants.TYPE_AND_LEN_AS_SHORT : parseFlags |
| .getLength() + Constants.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) { |
| int iLenStartIndex = cb.writerIndex(); |
| cb.writeByte(FLAGS); |
| cb.writeByte(getType()); |
| cb.writeByte(4); |
| cb.writeInt(med()); |
| return cb.writerIndex() - iLenStartIndex; |
| } |
| |
| @Override |
| public int compareTo(Object o) { |
| // TODO Auto-generated method stub |
| return 0; |
| } |
| } |