[Emu] [ONOS-2601] Implement BGP Update protocol message and parse all basic path attributes.
Change-Id: I85f912eeebacf46d699fdcf5549e06bae702823e
diff --git a/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/Origin.java b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/Origin.java
new file mode 100644
index 0000000..3b2070d
--- /dev/null
+++ b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/Origin.java
@@ -0,0 +1,166 @@
+/*
+ * 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.util.Objects;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.util.Validation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Provides Implementation of mandatory BGP Origin path attribute.
+ */
+public class Origin implements BGPValueType {
+ private static final Logger log = LoggerFactory.getLogger(Origin.class);
+
+ /**
+ * 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 int TYPE_AND_LEN_AS_SHORT = 4;
+ public static final int TYPE_AND_LEN_AS_BYTE = 3;
+
+ 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() + TYPE_AND_LEN_AS_SHORT : parseFlags
+ .getLength() + 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) {
+ //Not required to Implement as of now
+ return 0;
+ }
+
+ @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();
+ }
+}
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