[Emu][onos-2603] - Implement LinkState Link attributes-Link IGP Metric
Change-Id: I700922df22f5379679b3a5859cc3533f5532ae5a
diff --git a/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrIgpMetric.java b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrIgpMetric.java
new file mode 100755
index 0000000..c1cb299
--- /dev/null
+++ b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/attr/BgpLinkAttrIgpMetric.java
@@ -0,0 +1,172 @@
+/*
+ * 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();
+ }
+}