ONOS-574 - Complete REST APIs for flows

- codecs for all objects referenced by flows
- codecs for HostToHost and PointToPoint intents
- standardized on context.codec() rather than direct calls to new codec()

Change-Id: I94fcb6e31a9161132c6efc2793b9c46fa3cc4570
diff --git a/web/api/src/main/java/org/onosproject/codec/impl/HostToHostIntentCodec.java b/web/api/src/main/java/org/onosproject/codec/impl/HostToHostIntentCodec.java
new file mode 100644
index 0000000..f69d10f
--- /dev/null
+++ b/web/api/src/main/java/org/onosproject/codec/impl/HostToHostIntentCodec.java
@@ -0,0 +1,47 @@
+/*
+ * 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.codec.impl;
+
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.net.intent.ConnectivityIntent;
+import org.onosproject.net.intent.HostToHostIntent;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Host to host intent codec.
+ */
+public class HostToHostIntentCodec extends JsonCodec<HostToHostIntent> {
+
+    @Override
+    public ObjectNode encode(HostToHostIntent intent, CodecContext context) {
+        checkNotNull(intent, "Host to host intent cannot be null");
+
+        final JsonCodec<ConnectivityIntent> connectivityIntentCodec =
+                context.codec(ConnectivityIntent.class);
+        final ObjectNode result = connectivityIntentCodec.encode(intent, context);
+
+        final String one = intent.one().toString();
+        final String two = intent.two().toString();
+        result.put("one", one);
+        result.put("two", two);
+
+        return result;
+    }
+}