| /* |
| * Copyright 2015-present 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 com.google.common.base.MoreObjects; |
| 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 java.util.Objects; |
| |
| /** |
| * Provides Implementation of mandatory BGP Origin path attribute. |
| */ |
| public class Origin implements BgpValueType { |
| |
| /** |
| * Enum to provide ORIGIN types. |
| */ |
| public enum OriginType { |
| IGP(0), EGP(1), INCOMPLETE(2); |
| int value; |
| /** |
| * Assign val with the value as the ORIGIN type. |
| * |
| * @param val ORIGIN type |
| */ |
| OriginType(int val) { |
| value = val; |
| } |
| |
| /** |
| * Returns value of ORIGIN type. |
| * |
| * @return ORIGIN type |
| */ |
| public byte getType() { |
| return (byte) value; |
| } |
| } |
| |
| public static final byte ORIGIN_TYPE = 1; |
| public static final byte ORIGIN_VALUE_LEN = 1; |
| public static final byte FLAGS = (byte) 0x40; |
| |
| private boolean isOrigin = false; |
| private byte origin; |
| |
| /** |
| * Constructor to initialize parameters. |
| * |
| * @param origin origin value |
| */ |
| public Origin(byte origin) { |
| this.origin = origin; |
| this.isOrigin = true; |
| } |
| |
| /** |
| * Returns true if origin attribute is present otherwise false. |
| * |
| * @return whether origin is present or not |
| */ |
| public boolean isOriginSet() { |
| return this.isOrigin; |
| } |
| |
| /** |
| * Returns type of Origin in Enum values. |
| * |
| * @return type of Origin in Enum values |
| */ |
| public OriginType origin() { |
| if (this.origin == 0) { |
| return OriginType.IGP; |
| } else if (this.origin == 1) { |
| return OriginType.EGP; |
| } else { |
| return OriginType.INCOMPLETE; |
| } |
| } |
| |
| /** |
| * Reads from ChannelBuffer and parses Origin. |
| * |
| * @param cb ChannelBuffer |
| * @return object of Origin |
| * @throws BgpParseException while parsing Origin path attribute |
| */ |
| public static Origin read(ChannelBuffer cb) throws BgpParseException { |
| ChannelBuffer tempCb = cb.copy(); |
| Validation parseFlags = Validation.parseAttributeHeader(cb); |
| |
| 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.getLength() > ORIGIN_VALUE_LEN) || (cb.readableBytes() < parseFlags.getLength())) { |
| Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_LENGTH_ERROR, |
| parseFlags.getLength()); |
| } |
| if (parseFlags.getFirstBit() && !parseFlags.getSecondBit() && parseFlags.getThirdBit()) { |
| throw new BgpParseException(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_FLAGS_ERROR, data); |
| } |
| |
| byte originValue; |
| originValue = cb.readByte(); |
| if ((originValue != OriginType.INCOMPLETE.value) && (originValue != OriginType.IGP.value) && |
| (originValue != OriginType.EGP.value)) { |
| throw new BgpParseException(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.INVALID_ORIGIN_ATTRIBUTE, data); |
| } |
| return new Origin(originValue); |
| } |
| |
| @Override |
| public short getType() { |
| return ORIGIN_TYPE; |
| } |
| |
| @Override |
| public int write(ChannelBuffer cb) { |
| int iLenStartIndex = cb.writerIndex(); |
| cb.writeByte(FLAGS); |
| cb.writeByte(ORIGIN_TYPE); |
| cb.writeByte(1); |
| cb.writeByte(origin().value); |
| return cb.writerIndex() - iLenStartIndex; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(origin); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj instanceof Origin) { |
| Origin other = (Origin) obj; |
| return Objects.equals(origin, other.origin); |
| } |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("origin", origin) |
| .toString(); |
| } |
| |
| @Override |
| public int compareTo(Object o) { |
| // TODO Auto-generated method stub |
| return 0; |
| } |
| } |