diff --git a/src/main/java/net/onrc/onos/intent/IntentMap.java b/src/main/java/net/onrc/onos/intent/IntentMap.java
new file mode 100644
index 0000000..f9d8b9f
--- /dev/null
+++ b/src/main/java/net/onrc/onos/intent/IntentMap.java
@@ -0,0 +1,109 @@
+package net.onrc.onos.intent;
+
+import java.util.Collection;
+import java.util.EventListener;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map.Entry;
+
+import net.onrc.onos.intent.Intent.IntentState;
+
+/**
+ * @author Toshio Koide (t-koide@onlab.us)
+ */
+public class IntentMap {
+	public enum ChangedEventType {
+		/**
+		 * Added new intent.
+		 */
+		ADDED,
+
+		/**
+		 * Removed existing intent.
+		 * The specified intent is an instance of Intent class (not a child class)
+		 * Only id and state are valid.
+		 */
+		REMOVED,
+
+		/**
+		 * Changed state of existing intent.
+		 * The specified intent is an instance of Intent class (not a child class)
+		 * Only id and state are valid.
+		 */
+		STATE_CHANGED,
+	}
+
+	public class ChangedEvent {
+		public ChangedEvent(ChangedEventType eventType, Intent intent) {
+			this.eventType = eventType;
+			this.intent = intent;
+		}
+		public ChangedEventType eventType;
+		public Intent intent;
+	}
+
+	public interface ChangedListener extends EventListener {
+		void intentsChange(LinkedList<ChangedEvent> events);
+	}
+
+	private HashSet<ChangedListener> listeners = new HashSet<>();
+	protected HashMap<String, Intent> intents = new HashMap<>();
+
+	public void executeOperations(List<IntentOperation> operations) {
+		LinkedList<ChangedEvent> events = new LinkedList<>();
+		for (IntentOperation operation: operations) {
+			switch (operation.operator) {
+			case ADD:
+				intents.put(operation.intent.getId(), operation.intent);
+				events.add(new ChangedEvent(ChangedEventType.ADDED, operation.intent));
+				break;
+			case REMOVE:
+				Intent intent = intents.get(operation.intent.getId());
+				if (intent == null) {
+					// TODO throw exception
+				}
+				else {
+					intent.setState(Intent.IntentState.DEL_REQ);
+					events.add(new ChangedEvent(ChangedEventType.STATE_CHANGED,
+							new Intent(intent.getId(), Intent.IntentState.DEL_REQ)));
+				}
+				break;
+			}
+		}
+		for (ChangedListener listener: listeners) {
+			listener.intentsChange(events);
+		}
+	}
+
+	public void purge() {
+		Iterator<Entry<String, Intent>> i = intents.entrySet().iterator();
+		while (i.hasNext()) {
+			Entry<String, Intent> entry = i.next();
+			Intent intent = entry.getValue();
+			if (intent.getState() == IntentState.DEL_ACK
+					|| intent.getState() == IntentState.INST_NACK) {
+				i.remove();
+			}
+		}
+	}
+
+	public Collection<Intent> getAllIntents() {
+		return intents.values();
+	}
+
+	public Intent getIntent(String key) {
+		return intents.get(key);
+	}
+
+
+	public void addChangeListener(ChangedListener listener) {
+		listeners.add(listener);
+	}
+
+	public void removeChangedListener(ChangedListener listener) {
+		listeners.remove(listener);
+	}
+}