From 3ff6bda2addee269ebfaefdba8591bc38390cd0b Mon Sep 17 00:00:00 2001
From: Inderjeet Singh <inder123@gmail.com>
Date: Fri, 14 Nov 2008 22:33:39 +0000
Subject: [PATCH] Added equals and hashcode to JsonNull to ensure all instances
 of this class are the same.

---
 gson/src/main/java/com/google/gson/JsonNull.java | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gson/src/main/java/com/google/gson/JsonNull.java b/gson/src/main/java/com/google/gson/JsonNull.java
index 92f197e6..6cc99c0e 100755
--- a/gson/src/main/java/com/google/gson/JsonNull.java
+++ b/gson/src/main/java/com/google/gson/JsonNull.java
@@ -31,4 +31,20 @@ public final class JsonNull extends JsonElement {
   protected void toString(StringBuilder sb) {
     sb.append("null");
   }
+  
+  /**
+   * All instances of JsonNull have the same hash code since they are indistinguishable
+   */
+  @Override
+  public int hashCode() {
+    return JsonNull.class.hashCode();
+  }
+  
+  /**
+   * All instances of JsonNull are the same
+   */
+  @Override
+  public boolean equals(Object other) {
+    return other instanceof JsonNull;
+  }  
 }