| /* |
| * 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.attr; |
| |
| import java.util.Objects; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.onosproject.bgpio.exceptions.BGPParseException; |
| import org.onosproject.bgpio.types.BGPErrorType; |
| import org.onosproject.bgpio.types.BGPValueType; |
| import org.onosproject.bgpio.util.Validation; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.MoreObjects; |
| |
| /** |
| * Implements BGP link IGP metric attribute. |
| */ |
| public class BgpLinkAttrIgpMetric implements BGPValueType { |
| |
| protected static final Logger log = LoggerFactory |
| .getLogger(BgpLinkAttrIgpMetric.class); |
| |
| public static final int ATTRLINK_IGPMETRIC = 1095; |
| public static final int ATTRLINK_MAX_LEN = 3; |
| |
| /* Variable metric length based on protocol */ |
| public static final int ISIS_SMALL_METRIC = 1; |
| public static final int OSPF_LINK_METRIC = 2; |
| public static final int ISIS_WIDE_METRIC = 3; |
| |
| /* IGP Metric */ |
| private final int igpMetric; |
| private final int igpMetricLen; |
| |
| /** |
| * Constructor to initialize the value. |
| * |
| * @param igpMetric 3 byte IGP metric data. |
| * @param igpMetricLen length of IGP metric data. |
| */ |
| public BgpLinkAttrIgpMetric(final int igpMetric, final int igpMetricLen) { |
| this.igpMetric = igpMetric; |
| this.igpMetricLen = igpMetricLen; |
| } |
| |
| /** |
| * Returns object of this class with specified values. |
| * |
| * @param igpMetric 3 byte IGP metric data. |
| * @param igpMetricLen length of IGP metric data. |
| * @return object of BgpLinkAttrIgpMetric |
| */ |
| public static BgpLinkAttrIgpMetric of(final int igpMetric, |
| final int igpMetricLen) { |
| return new BgpLinkAttrIgpMetric(igpMetric, igpMetricLen); |
| } |
| |
| /** |
| * Reads the BGP link attributes IGP Metric. |
| * |
| * @param cb Channel buffer |
| * @return object of type BgpLinkAttrIgpMetric |
| * @throws BGPParseException while parsing BgpLinkAttrIgpMetric |
| */ |
| public static BgpLinkAttrIgpMetric read(ChannelBuffer cb) |
| throws BGPParseException { |
| |
| short linkigp; |
| int igpMetric = 0; |
| int igpMetricLen = 0; |
| |
| short lsAttrLength = cb.readShort(); |
| |
| if (cb.readableBytes() < lsAttrLength |
| || lsAttrLength > ATTRLINK_MAX_LEN) { |
| Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, |
| BGPErrorType.ATTRIBUTE_LENGTH_ERROR, |
| lsAttrLength); |
| } |
| |
| switch (lsAttrLength) { |
| case ISIS_SMALL_METRIC: |
| igpMetric = cb.readByte(); |
| igpMetricLen = ISIS_SMALL_METRIC; |
| break; |
| case OSPF_LINK_METRIC: |
| igpMetric = cb.readShort(); |
| igpMetricLen = OSPF_LINK_METRIC; |
| break; |
| case ISIS_WIDE_METRIC: |
| linkigp = cb.readShort(); |
| igpMetric = cb.readByte(); |
| igpMetric = (igpMetric << 16) | linkigp; |
| igpMetricLen = ISIS_WIDE_METRIC; |
| break; |
| default: // validation is already in place |
| break; |
| } |
| |
| return BgpLinkAttrIgpMetric.of(igpMetric, igpMetricLen); |
| } |
| |
| /** |
| * Returns the variable length IGP metric data. |
| * |
| * @return IGP metric data |
| */ |
| public int attrLinkIgpMetric() { |
| return igpMetric; |
| } |
| |
| /** |
| * Returns IGP metric data length. |
| * |
| * @return IGP metric length |
| */ |
| public int attrLinkIgpMetricLength() { |
| return igpMetricLen; |
| } |
| |
| @Override |
| public short getType() { |
| return ATTRLINK_IGPMETRIC; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(igpMetric, igpMetricLen); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| |
| if (obj instanceof BgpLinkAttrIgpMetric) { |
| BgpLinkAttrIgpMetric other = (BgpLinkAttrIgpMetric) obj; |
| return Objects.equals(igpMetric, other.igpMetric) |
| && Objects.equals(igpMetricLen, other.igpMetricLen); |
| } |
| return false; |
| } |
| |
| @Override |
| public int write(ChannelBuffer cb) { |
| // TODO This will be implemented in the next version |
| return 0; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("igpMetric", igpMetric).add("igpMetricLen", igpMetricLen) |
| .toString(); |
| } |
| } |