[ONOS-7262] Cfm improvements to allow RMeps and Mds and Mas to be added and deleted

Change-Id: Ibffb13d046bfb29dbe88de7b558c95fbf9db046d
diff --git a/apps/cfm/src/main/java/org/onosproject/cfm/cli/completer/CfmMepIdCompleter.java b/apps/cfm/src/main/java/org/onosproject/cfm/cli/completer/CfmMepIdCompleter.java
new file mode 100644
index 0000000..6019916
--- /dev/null
+++ b/apps/cfm/src/main/java/org/onosproject/cfm/cli/completer/CfmMepIdCompleter.java
@@ -0,0 +1,81 @@
+/*
+ * 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.cfm.cli.completer;
+
+import org.onosproject.cli.AbstractChoicesCompleter;
+import org.onosproject.incubator.net.l2monitoring.cfm.service.CfmConfigException;
+import org.onosproject.incubator.net.l2monitoring.cfm.service.CfmMdService;
+import org.onosproject.incubator.net.l2monitoring.cfm.service.CfmMepService;
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.onosproject.cli.AbstractShellCommand.get;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * CLI completer for Mep Id creation.
+ */
+public class CfmMepIdCompleter extends AbstractChoicesCompleter {
+    private final Logger log = getLogger(getClass());
+
+    @Override
+    public List<String> choices() {
+        List<String> choices = new ArrayList<>();
+
+        CfmMdService mdService = get(CfmMdService.class);
+        CfmMepService mepService = get(CfmMepService.class);
+
+        mdService.getAllMaintenanceDomain().forEach(md -> {
+            choices.add(new StringBuilder(md.mdId().mdName())
+                            .append("(")
+                            .append(md.mdId().nameType())
+                            .append(")").toString());
+
+            md.maintenanceAssociationList().forEach(ma -> {
+                    choices.add(new StringBuilder(md.mdId().mdName())
+                            .append("(")
+                            .append(md.mdId().nameType())
+                            .append(") ")
+                            .append(ma.maId().maName())
+                            .append("(")
+                            .append(ma.maId().nameType())
+                            .append(")").toString());
+
+                    try {
+                        mepService.getAllMeps(md.mdId(), ma.maId()).forEach(mep ->
+                                choices.add(new StringBuilder(md.mdId().mdName())
+                                        .append("(")
+                                        .append(md.mdId().nameType())
+                                        .append(") ")
+                                        .append(ma.maId().maName())
+                                        .append("(")
+                                        .append(ma.maId().nameType())
+                                        .append(") ")
+                                        .append(mep.mepId()).toString())
+                        );
+                    } catch (CfmConfigException e) {
+                        log.warn("Unable to retrieve mep details", e);
+                    }
+                }
+            );
+        });
+
+        return choices;
+    }
+
+}