1 files changed, 139 insertions, 0 deletions

diff --git a/framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/NextHop.java b/framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/NextHop.java
new file mode 100644
index 00000000..806efe52
--- /dev/null
+++ b/framework/src/onos/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/NextHop.java
@@ -0,0 +1,139 @@
+/*
+ * 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.net.InetAddress;
+import java.util.Objects;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.bgpio.exceptions.BgpParseException;
+import org.onosproject.bgpio.util.Constants;
+import org.onosproject.bgpio.util.Validation;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+
+/**
+ * Implementation of NextHop BGP Path Attribute.
+ */
+public class NextHop implements BgpValueType {
+    public static final byte NEXTHOP_TYPE = 3;
+
+    private boolean isNextHop = false;
+    private Ip4Address nextHop;
+
+    /**
+     * Constructor to initialize parameters.
+     *
+     * @param nextHop nextHop address
+     */
+    public NextHop(Ip4Address nextHop) {
+        this.nextHop = Preconditions.checkNotNull(nextHop);
+        this.isNextHop = true;
+    }
+
+    /**
+     * Returns whether next hop is present.
+     *
+     * @return whether next hop is present
+     */
+    public boolean isNextHopSet() {
+        return this.isNextHop;
+    }
+
+    /**
+     * Reads from ChannelBuffer and parses NextHop.
+     *
+     * @param cb ChannelBuffer
+     * @return object of NextHop
+     * @throws BgpParseException while parsing nexthop attribute
+     */
+    public static NextHop read(ChannelBuffer cb) throws BgpParseException {
+        Ip4Address nextHop;
+        ChannelBuffer tempCb = cb.copy();
+        Validation parseFlags = Validation.parseAttributeHeader(cb);
+
+        if (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);
+        }
+
+         InetAddress ipAddress = Validation.toInetAddress(parseFlags.getLength(), cb);
+        if (ipAddress.isMulticastAddress()) {
+            throw new BgpParseException("Multicast address is not supported");
+        }
+
+        nextHop = Ip4Address.valueOf(ipAddress);
+        return new NextHop(nextHop);
+    }
+
+    /**
+     * Return nexthop address.
+     *
+     * @return nexthop address
+     */
+    public Ip4Address nextHop() {
+        return nextHop;
+    }
+
+    @Override
+    public short getType() {
+        return NEXTHOP_TYPE;
+    }
+
+    @Override
+    public int write(ChannelBuffer cb) {
+        //Not required to be implemented now
+        return 0;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(nextHop);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof NextHop) {
+            NextHop other = (NextHop) obj;
+            return Objects.equals(nextHop, other.nextHop);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("nextHop", nextHop)
+                .toString();
+    }
+
+    @Override
+    public int compareTo(Object o) {
+        // TODO Auto-generated method stub
+        return 0;
+    }
+}
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