1 files changed, 98 insertions, 0 deletions
diff --git a/framework/src/onos/protocols/pcep/pcepio/src/main/java/org/onosproject/pcepio/protocol/PcepFactories.java b/framework/src/onos/protocols/pcep/pcepio/src/main/java/org/onosproject/pcepio/protocol/PcepFactories.java
new file mode 100644
index 00000000..85416f98
--- /dev/null
+++ b/framework/src/onos/protocols/pcep/pcepio/src/main/java/org/onosproject/pcepio/protocol/PcepFactories.java
@@ -0,0 +1,98 @@
+/*
+ * 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.pcepio.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.pcepio.exceptions.PcepParseException;
+import org.onosproject.pcepio.protocol.ver1.PcepFactoryVer1;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Abstraction to provide the version for PCEP.
+ */
+public final class PcepFactories {
+
+    protected static final Logger log = LoggerFactory.getLogger(PcepFactories.class);
+
+    private static final GenericReader GENERIC_READER = new GenericReader();
+
+    public static final byte SHIFT_FLAG = 5;
+
+    private PcepFactories() {
+    }
+
+    /**
+     * Returns the instance of PCEP Version.
+     *
+     * @param version PCEP version
+     * @return PCEP version
+     */
+    public static PcepFactory getFactory(PcepVersion version) {
+        switch (version) {
+        case PCEP_1:
+            return PcepFactoryVer1.INSTANCE;
+        default:
+            throw new IllegalArgumentException("Unknown version: " + version);
+        }
+    }
+
+    private static class GenericReader implements PcepMessageReader<PcepMessage> {
+
+        @Override
+        public PcepMessage readFrom(ChannelBuffer bb) throws PcepParseException {
+
+            if (!bb.readable()) {
+                throw new PcepParseException("Empty message received");
+            }
+
+            /*
+             * 0                   1                   2                   3
+             * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+             * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+             * | Ver |  Flags  |                                               |
+             * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+             *
+             * Currently Version 1 is supported
+             * Currently no flags are used, it is all ignored
+             */
+
+            byte packetVersion = bb.getByte(bb.readerIndex());
+            packetVersion = (byte) (packetVersion >> SHIFT_FLAG);
+            PcepFactory factory;
+
+            switch (packetVersion) {
+
+            case 1:
+                factory = org.onosproject.pcepio.protocol.ver1.PcepFactoryVer1.INSTANCE;
+                break;
+            default:
+                throw new PcepParseException("Unknown Packet version: " + packetVersion);
+            }
+            return factory.getReader().readFrom(bb);
+        }
+    }
+
+    /**
+     * Returns GENERIC_READER.
+     *
+     * @return GENERIC_READER
+     */
+    public static PcepMessageReader<PcepMessage> getGenericReader() {
+        return GENERIC_READER;
+    }
+}