1 files changed, 68 insertions, 0 deletions
diff --git a/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/impl/LogicalTimestamp.java b/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/impl/LogicalTimestamp.java
new file mode 100644
index 00000000..5ae8b4f4
--- /dev/null
+++ b/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/impl/LogicalTimestamp.java
@@ -0,0 +1,68 @@
+package org.onosproject.store.impl;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import java.util.Objects;
+
+import org.onosproject.store.Timestamp;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ComparisonChain;
+
+/**
+ * Timestamp based on logical sequence value.
+ * <p>
+ * LogicalTimestamps are ordered by their sequence values.
+ */
+public class LogicalTimestamp implements Timestamp {
+
+    private final long value;
+
+    public LogicalTimestamp(long value) {
+        this.value = value;
+    }
+
+    @Override
+    public int compareTo(Timestamp o) {
+        checkArgument(o instanceof LogicalTimestamp,
+                "Must be LogicalTimestamp", o);
+        LogicalTimestamp that = (LogicalTimestamp) o;
+
+        return ComparisonChain.start()
+                .compare(this.value, that.value)
+                .result();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(value);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof LogicalTimestamp)) {
+            return false;
+        }
+        LogicalTimestamp that = (LogicalTimestamp) obj;
+        return Objects.equals(this.value, that.value);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                    .add("value", value)
+                    .toString();
+    }
+
+    /**
+     * Returns the sequence value.
+     *
+     * @return sequence value
+     */
+    public long value() {
+        return this.value;
+    }
+}