added demo rest api for adding and withdrawing intents in a mesh

Change-Id: Ic68a9054c8a1a3d4223e75845f78205d8703ae56
diff --git a/apps/demo/src/main/java/org/onlab/onos/demo/DemoResource.java b/apps/demo/src/main/java/org/onlab/onos/demo/DemoResource.java
new file mode 100644
index 0000000..f533072
--- /dev/null
+++ b/apps/demo/src/main/java/org/onlab/onos/demo/DemoResource.java
@@ -0,0 +1,54 @@
+package org.onlab.onos.demo;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.onlab.rest.BaseResource;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Rest API for demos.
+ */
+@Path("intents")
+public class DemoResource extends BaseResource {
+
+
+    @POST
+    @Path("setup")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response setup(InputStream input) throws IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        JsonNode cfg = mapper.readTree(input);
+        if (!cfg.has("type")) {
+            return Response.status(Response.Status.BAD_REQUEST)
+                    .entity("Expected type field containing either mesh or random.").build();
+        }
+
+        DemoAPI.InstallType type = DemoAPI.InstallType.valueOf(
+                cfg.get("type").asText().toUpperCase());
+        DemoAPI demo = get(DemoAPI.class);
+        demo.setup(type);
+
+        return Response.ok(mapper.createObjectNode().toString()).build();
+    }
+
+    @GET
+    @Path("teardown")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response tearDown() throws IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        DemoAPI demo = get(DemoAPI.class);
+        demo.tearDown();
+        return Response.ok(mapper.createObjectNode().toString()).build();
+    }
+
+}