Define the new Intent Framework APIs (Intent Service)

- Define the base Intent class and sub-classes required in SDN-IP
- IntentService provides the APIs for application developers
- IntentExtensionService enables to define application specific intent types
- Provide event handling mechanism via IntentEventListener

This is for ONOS-1654.

Change-Id: Id1705f1fbc1acd4862b33fd9ab97aafe2e84a685
diff --git a/src/main/java/net/onrc/onos/api/newintent/AbstractIntent.java b/src/main/java/net/onrc/onos/api/newintent/AbstractIntent.java
new file mode 100644
index 0000000..f2e3d8a
--- /dev/null
+++ b/src/main/java/net/onrc/onos/api/newintent/AbstractIntent.java
@@ -0,0 +1,42 @@
+package net.onrc.onos.api.newintent;
+
+/**
+ * Base intent implementation.
+ */
+public abstract class AbstractIntent implements Intent {
+
+    private final IntentId id;
+
+    /**
+     * Creates a base intent with the specified identifier.
+     *
+     * @param id intent identifier
+     */
+    protected AbstractIntent(IntentId id) {
+        this.id = id;
+    }
+
+    @Override
+    public IntentId getId() {
+        return id;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        AbstractIntent that = (AbstractIntent) o;
+        return id.equals(that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return id.hashCode();
+    }
+
+}