[AETHER-1295][AETHER-1294] First stab to the TOST APIs framework
and to the DROP policies.

Patch includes also some CLI commands. REST APIs will be implemented
in a separate review. Other review will follow to implement the logic
of the REDIRECT policies

Change-Id: I34aa3da700c5a16682196e4dd8db9c4757d609c4
diff --git a/impl/src/main/java/org/onosproject/segmentrouting/cli/TrafficMatchListCommand.java b/impl/src/main/java/org/onosproject/segmentrouting/cli/TrafficMatchListCommand.java
new file mode 100644
index 0000000..c00d1fa
--- /dev/null
+++ b/impl/src/main/java/org/onosproject/segmentrouting/cli/TrafficMatchListCommand.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2015-present Open Networking Foundation
+ *
+ * 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.segmentrouting.cli;
+
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.segmentrouting.policy.api.PolicyService;
+import org.onosproject.segmentrouting.policy.api.TrafficMatchData;
+
+/**
+ * Command to show the list of traffic matches.
+ */
+@Service
+@Command(scope = "onos", name = "sr-tmatch-list",
+        description = "Lists all traffic matches")
+public class TrafficMatchListCommand extends AbstractShellCommand {
+
+    private static final String FORMAT_MAPPING_TRAFFIC_MATCH =
+            "  id=%s, state=%s";
+    private static final String FORMAT_MAPPING_OPERATION =
+            "    op=%s";
+
+    @Override
+    protected void doExecute() {
+        PolicyService policyService = AbstractShellCommand.get(PolicyService.class);
+        policyService.trafficMatches().forEach(this::printTrafficMatch);
+    }
+
+    private void printTrafficMatch(TrafficMatchData trafficMatchData) {
+        print(FORMAT_MAPPING_TRAFFIC_MATCH, trafficMatchData.trafficMatch().trafficMatchId(),
+                trafficMatchData.trafficMatchState());
+        trafficMatchData.operations().forEach(operation -> print(FORMAT_MAPPING_OPERATION, operation));
+    }
+}