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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.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();
}
}
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