[ONOS-2600] Implementation of basic BGP protocol message parsing factories
Change-Id: Ie8ff454a36c9bff2a785ea198ed47ce5f60666cd
diff --git a/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BGPFactories.java b/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BGPFactories.java
new file mode 100755
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+++ b/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/BGPFactories.java
@@ -0,0 +1,82 @@
+/*
+ * 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.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.protocol.ver4.BGPFactoryVer4;
+import org.onosproject.bgpio.types.BGPHeader;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Abstraction to provide the version for BGP.
+ */
+public final class BGPFactories {
+
+ protected static final Logger log = LoggerFactory.getLogger(BGPFactories.class);
+
+ private static final GenericReader GENERIC_READER = new GenericReader();
+
+ private BGPFactories() {
+ }
+
+ /**
+ * Returns the instance of BGP Version.
+ *
+ * @param version BGP version
+ * @return BGP version
+ */
+ public static BGPFactory getFactory(BGPVersion version) {
+ switch (version) {
+ case BGP_4:
+ return BGPFactoryVer4.INSTANCE;
+ default:
+ throw new IllegalArgumentException("[BGPFactory:]Unknown version: " + version);
+ }
+ }
+
+ /**
+ * Reader class for reading BGP messages from channel buffer.
+ *
+ */
+ private static class GenericReader implements BGPMessageReader<BGPMessage> {
+
+ @Override
+ public BGPMessage readFrom(ChannelBuffer bb, BGPHeader bgpHeader)
+ throws BGPParseException {
+ BGPFactory factory;
+
+ if (!bb.readable()) {
+ log.error("Empty message received");
+ throw new BGPParseException("Empty message received");
+ }
+ // TODO: Currently only BGP version 4 is supported
+ factory = org.onosproject.bgpio.protocol.ver4.BGPFactoryVer4.INSTANCE;
+ return factory.getReader().readFrom(bb, bgpHeader);
+ }
+ }
+
+ /**
+ * Returns BGP messsage generic reader.
+ *
+ * @return bgp message generic reader
+ */
+ public static BGPMessageReader<BGPMessage> getGenericReader() {
+ return GENERIC_READER;
+ }
+}