[CORD-2839] Handling multiple sources

Change-Id: I77bd98e8a12e5044421ef5e0b048833dd688cb2e
diff --git a/app/src/main/java/org/onosproject/segmentrouting/cli/McastRoleListCommand.java b/app/src/main/java/org/onosproject/segmentrouting/cli/McastRoleListCommand.java
new file mode 100644
index 0000000..facd6a1
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+++ b/app/src/main/java/org/onosproject/segmentrouting/cli/McastRoleListCommand.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2018-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 com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
+import org.onlab.packet.IpAddress;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.mcast.cli.McastGroupCompleter;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.segmentrouting.SegmentRoutingService;
+import org.onosproject.segmentrouting.mcast.McastRole;
+import org.onosproject.segmentrouting.mcast.McastRoleStoreKey;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import static com.google.common.base.Strings.isNullOrEmpty;
+
+/**
+ * Command to show the list of mcast roles.
+ */
+@Command(scope = "onos", name = "sr-mcast-role",
+        description = "Lists all mcast roles")
+public class McastRoleListCommand extends AbstractShellCommand {
+
+    // OSGi workaround to introduce package dependency
+    McastGroupCompleter completer;
+
+    // Format for group line
+    private static final String FORMAT_MAPPING = "%s,%s  ingress=%s\ttransit=%s\tegress=%s";
+
+    @Option(name = "-gAddr", aliases = "--groupAddress",
+            description = "IP Address of the multicast group",
+            valueToShowInHelp = "224.0.0.0",
+            required = false, multiValued = false)
+    String gAddr = null;
+
+    @Option(name = "-src", aliases = "--connectPoint",
+            description = "Source port of:XXXXXXXXXX/XX",
+            valueToShowInHelp = "of:0000000000000001/1",
+            required = false, multiValued = false)
+    String source = null;
+
+    @Override
+    protected void execute() {
+        // Verify mcast group
+        IpAddress mcastGroup = null;
+        // We want to use source cp only for a specific group
+        ConnectPoint sourcecp = null;
+        if (!isNullOrEmpty(gAddr)) {
+            mcastGroup = IpAddress.valueOf(gAddr);
+            if (!isNullOrEmpty(source)) {
+                sourcecp = ConnectPoint.deviceConnectPoint(source);
+            }
+        }
+        // Get SR service, the roles and the groups
+        SegmentRoutingService srService = get(SegmentRoutingService.class);
+        Map<McastRoleStoreKey, McastRole> keyToRole = srService.getMcastRoles(mcastGroup, sourcecp);
+        Set<IpAddress> mcastGroups = keyToRole.keySet().stream()
+                .map(McastRoleStoreKey::mcastIp)
+                .collect(Collectors.toSet());
+        // Print the trees for each group
+        mcastGroups.forEach(group -> {
+            // Create a new map for the group
+            Map<ConnectPoint, Multimap<McastRole, DeviceId>> roleDeviceIdMap = Maps.newHashMap();
+            keyToRole.entrySet()
+                    .stream()
+                    .filter(entry -> entry.getKey().mcastIp().equals(group))
+                    .forEach(entry -> roleDeviceIdMap.compute(entry.getKey().source(), (gsource, map) -> {
+                        map = map == null ? ArrayListMultimap.create() : map;
+                        map.put(entry.getValue(), entry.getKey().deviceId());
+                        return map;
+                    }));
+            roleDeviceIdMap.forEach((gsource, map) -> {
+                // Print the map
+                printMcastRole(group, gsource,
+                               map.get(McastRole.INGRESS),
+                               map.get(McastRole.TRANSIT),
+                               map.get(McastRole.EGRESS));
+            });
+        });
+    }
+
+    private void printMcastRole(IpAddress mcastGroup, ConnectPoint source,
+                                Collection<DeviceId> ingress,
+                                Collection<DeviceId> transit,
+                                Collection<DeviceId> egress) {
+        print(FORMAT_MAPPING, mcastGroup, source, ingress, transit, egress);
+    }
+}