diff --git a/src/main/java/net/onrc/onos/api/intent/Intent.java b/src/main/java/net/onrc/onos/api/intent/Intent.java
index be34ba8..0488b35 100644
--- a/src/main/java/net/onrc/onos/api/intent/Intent.java
+++ b/src/main/java/net/onrc/onos/api/intent/Intent.java
@@ -1,40 +1,38 @@
 package net.onrc.onos.api.intent;
 
-import java.util.List;
-
-import net.onrc.onos.api.batchoperation.BatchOperation;
+import com.google.common.base.Objects;
 import net.onrc.onos.api.batchoperation.IBatchOperationTarget;
-import net.onrc.onos.api.flowmanager.IFlow;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
- * The base class for the connectivity abstraction. It allows applications to
- * specify end hosts, apply some basic filtering to traffic, and constrain
- * traffic.
- * <p>
+ * The base class of an intent type.
+
  * This class is sub-classed to provide other intent types like shortest path
  * connectivity and bandwidth constrained shortest path connectivity.
- * <p>
+
  * The reasoning behind "intent" is that the applications can provide some
  * abstract representation of how traffic should flow be handled by the
  * networking, allowing the network OS to compile, reserve and optimize the
  * data-plane to satisfy those constraints.
+ *
+ * It is assumed that any kinds of intents are immutable.
+ * Developers that will define a new intent type should ensure its immutability.
  */
 public abstract class Intent implements IBatchOperationTarget {
     private final IntentId id;
 
     /**
-     * Constructor.
+     * Constructs an intent, which is activated permanently until it is removed explicitly.
      *
-     * @param id ID for this Intent object.
+     * @param id ID for this intent object.
      */
     protected Intent(IntentId id) {
         this.id = checkNotNull(id);
     }
 
     /**
-     * Gets ID for this Intent object.
+     * Returns ID for this Intent object.
      *
      * @return ID for this Intent object.
      */
@@ -43,13 +41,29 @@
         return id;
     }
 
-    /**
-     * Compiles this Intent object to the list of FlowOperations.
-     * <p>
-     * All Intent object must implement this method and IntentRuntimeModule use
-     * this method to process this Intent.
-     *
-     * @return The list of FlowOperations of this Intent.
-     */
-    public abstract List<BatchOperation<IFlow>> compile();
+    @Override
+    public int hashCode() {
+        return id.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+
+        if (!(obj instanceof Intent)) {
+            return false;
+        }
+
+        Intent that = (Intent) obj;
+        return Objects.equal(this.id, that.id);
+    }
+
+    @Override
+    public String toString() {
+        return Objects.toStringHelper(this)
+                .add("id", id)
+                .toString();
+    }
 }
diff --git a/src/main/java/net/onrc/onos/api/intent/OpticalConnectivityIntent.java b/src/main/java/net/onrc/onos/api/intent/OpticalConnectivityIntent.java
index e9d6171..256fa44 100644
--- a/src/main/java/net/onrc/onos/api/intent/OpticalConnectivityIntent.java
+++ b/src/main/java/net/onrc/onos/api/intent/OpticalConnectivityIntent.java
@@ -1,9 +1,5 @@
 package net.onrc.onos.api.intent;
 
-import java.util.List;
-
-import net.onrc.onos.api.batchoperation.BatchOperation;
-import net.onrc.onos.api.flowmanager.IFlow;
 import net.onrc.onos.core.util.SwitchPort;
 
 /**
@@ -49,10 +45,4 @@
     public SwitchPort getDstSwitchPort() {
         return dstSwitchPort;
     }
-
-    @Override
-    public List<BatchOperation<IFlow>> compile() {
-        // TODO Auto-generated method stub
-        return null;
-    }
 }
diff --git a/src/main/java/net/onrc/onos/api/intent/PacketConnectivityIntent.java b/src/main/java/net/onrc/onos/api/intent/PacketConnectivityIntent.java
index 020dd56..77a2a13 100644
--- a/src/main/java/net/onrc/onos/api/intent/PacketConnectivityIntent.java
+++ b/src/main/java/net/onrc/onos/api/intent/PacketConnectivityIntent.java
@@ -1,16 +1,13 @@
 package net.onrc.onos.api.intent;
 
+import net.onrc.onos.core.matchaction.match.PacketMatch;
+import net.onrc.onos.core.util.SwitchPort;
+
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Set;
 
-import net.onrc.onos.api.batchoperation.BatchOperation;
-import net.onrc.onos.api.flowmanager.IFlow;
-import net.onrc.onos.core.matchaction.match.PacketMatch;
-import net.onrc.onos.core.util.SwitchPort;
-
 /**
  * A packet layer Intent for a connectivity from a set of ports to a set of
  * ports.
@@ -163,10 +160,4 @@
     public boolean canSetupOpticalFlow() {
         return canSetupOpticalFlow;
     }
-
-    @Override
-    public List<BatchOperation<IFlow>> compile() {
-        // TODO Auto-generated method stub
-        return null;
-    }
 }