From 2af70cb5173d8eb679e7f7112a0e42a1c2e29192 Mon Sep 17 00:00:00 2001
From: Tsz-wo Sze <szetszwo@apache.org>
Date: Mon, 30 Apr 2012 22:57:22 +0000
Subject: [PATCH] HDFS-3293. Add toString(), equals(..) and hashCode() to
 JournalInfo.  Contributed by Hari Mankude

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1332458 13f79535-47bb-0310-9956-ffa450edef68
---
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt   |  3 +++
 .../hdfs/server/protocol/JournalInfo.java     | 25 +++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index adb26af34a..bf51c6a6f7 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -74,6 +74,9 @@ Trunk (unreleased changes)
     HDFS-2743. Streamline usage of bookkeeper journal manager. 
     (Ivan Kelly via umamahesh)
 
+    HDFS-3293. Add toString(), equals(..) and hashCode() to JournalInfo.
+    (Hari Mankude via szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-2834. Add a ByteBuffer-based read API to DFSInputStream.
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalInfo.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalInfo.java
index 530934d237..7261a1c84a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalInfo.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/JournalInfo.java
@@ -45,4 +45,29 @@ public String getClusterId() {
   public int getNamespaceId() {
     return namespaceId;
   }
+  
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("lv=").append(layoutVersion).append(";cid=").append(clusterId)
+    .append(";nsid=").append(namespaceId);
+    return sb.toString();
+  }
+  
+  @Override
+  public boolean equals(Object o) {
+    JournalInfo jInfo;
+    if (!(o instanceof JournalInfo)) {
+      return false;
+    }
+    jInfo = (JournalInfo) o;
+    return ((jInfo.clusterId.equals(this.clusterId))
+        && (jInfo.namespaceId == this.namespaceId)
+        && (jInfo.layoutVersion == this.layoutVersion));
+  }
+  
+  @Override
+  public int hashCode() {
+    return (namespaceId ^ layoutVersion ^ clusterId.hashCode());
+  }
 }