Add an ACL application

- change both of the constructors in AclRule.class to be private
- change AclRule.class to be final
- remove useless reference

|URL|Notes|
|-|-|
|GET onos/v1/acl | Lists all existing ACL rules.|
|GET onos/v1/acl/remove/{id} | Removes an existing ACL rule by id|
|GET onos/v1/acl/clear | Clears ACL and reset all|
|POST onos/v1/acl/add | Adds a new ACL rule|

|Key|Value|Notes|
|-|-|-|
|ipProto | string | "TCP" or "UDP" or "ICMP" (ignoring case)|
|srcIp | IPv4 address[/mask] | Either src-ip or dst-ip must be specified.|
|dstIp | IPv4 address[/mask] | Either src-ip or dst-ip must be specified.|
|dstTpPort | number | Valid when nw-proto == "TCP" or "UDP".|
|action | string | "DENY" or "ALLOW" (ignoring case), set to "DENY" if not specified.|

Change-Id: I55170d5f50814eabef43b1bf2ee33af41b5987e4
diff --git a/apps/acl/src/main/java/org/onos/acl/AclService.java b/apps/acl/src/main/java/org/onos/acl/AclService.java
new file mode 100644
index 0000000..0c2b734
--- /dev/null
+++ b/apps/acl/src/main/java/org/onos/acl/AclService.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ * Originally created by Pengfei Lu, Network and Cloud Computing Laboratory, Dalian University of Technology, China
+ * Advisers: Keqiu Li and Heng Qi
+ * This work is supported by the State Key Program of National Natural Science of China(Grant No. 61432002)
+ * and Prospective Research Project on Future Networks in Jiangsu Future Networks Innovation Institute.
+ *
+ * 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.onos.acl;
+
+import java.util.List;
+
+/**
+ * Service interface exported by ACL application.
+ */
+public interface AclService {
+
+    /**
+     * Gets a list containing all ACL rules.
+     * @return a list containing all ACL rules
+     */
+    List<AclRule> getAclRules();
+
+    /**
+     * Adds a new ACL rule.
+     * @param rule ACL rule
+     * @return true if successfully added, otherwise false
+     */
+    boolean addAclRule(AclRule rule);
+
+    /**
+     * Removes an exsiting ACL rule by rule id.
+     * @param ruleId ACL rule identifier
+     */
+    void removeAclRule(RuleId ruleId);
+
+    /**
+     * Clears ACL and resets all.
+     */
+    void clearAcl();
+
+}
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