1 files changed, 80 insertions, 0 deletions
diff --git a/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/ecmap/UpdateEntry.java b/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/ecmap/UpdateEntry.java
new file mode 100644
index 00000000..53683b98
--- /dev/null
+++ b/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/ecmap/UpdateEntry.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.store.ecmap;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Describes a single update event in an EventuallyConsistentMap.
+ */
+final class UpdateEntry<K, V> {
+    private final K key;
+    private final MapValue<V> value;
+
+    /**
+     * Creates a new update entry.
+     *
+     * @param key key of the entry
+     * @param value value of the entry
+     */
+    public UpdateEntry(K key, MapValue<V> value) {
+        this.key = checkNotNull(key);
+        this.value = value;
+    }
+
+    /**
+     * Returns the key.
+     *
+     * @return the key
+     */
+    public K key() {
+        return key;
+    }
+
+    /**
+     * Returns the value of the entry.
+     *
+     * @return the value
+     */
+    public MapValue<V> value() {
+        return value;
+    }
+
+    /**
+     * Returns if this entry is newer than other entry.
+     * @param other other entry
+     * @return true if this entry is newer; false otherwise
+     */
+    public boolean isNewerThan(UpdateEntry<K, V> other) {
+        return other == null || other.value == null || (value != null && value.isNewerThan(other.value));
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("key", key())
+                .add("value", value)
+                .toString();
+    }
+
+    @SuppressWarnings("unused")
+    private UpdateEntry() {
+        this.key = null;
+        this.value = null;
+    }
+}