refactor

src/Cap.Consistency/Internal/TopicInfo.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace Cap.Consistency
+{
+    public class TopicInfo
+    {
+        public TopicInfo(string topicName) : this(topicName, 0) {}
+
+        public TopicInfo(string topicName, int partition) : this(topicName, partition, 0) {}
+
+        public TopicInfo(string topicName, int partition, long offset) {
+            Name = topicName;
+            Offset = offset;
+            Partition = partition;       
+        }       
+
+        public string Name { get; }
+    
+        public int Partition { get; }
+
+        public long Offset { get; }
+
+        public bool IsPartition { get { return Partition == 0; } }
+
+        public bool IsOffset { get { return Offset == 0; } }
+
+        public override string ToString() {
+            return Name;
+        }
+
+    }
+}