From 3dfae9a31d6492f996c6aaefc77d5354549348bc Mon Sep 17 00:00:00 2001
From: Les Hazlewood <les@hazlewood.com>
Date: Fri, 1 Apr 2016 18:26:59 -0700
Subject: [PATCH] 109: removed implementation coupling from Clock interface. 
 DefaultClock.INSTANCE achieves the same thing without coupling.

---
 src/main/java/io/jsonwebtoken/Clock.java                 | 4 ----
 src/main/java/io/jsonwebtoken/impl/DefaultClock.java     | 5 +++++
 src/main/java/io/jsonwebtoken/impl/DefaultJwtParser.java | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/main/java/io/jsonwebtoken/Clock.java b/src/main/java/io/jsonwebtoken/Clock.java
index 7e57df80..9e98d02b 100644
--- a/src/main/java/io/jsonwebtoken/Clock.java
+++ b/src/main/java/io/jsonwebtoken/Clock.java
@@ -1,7 +1,5 @@
 package io.jsonwebtoken;
 
-import io.jsonwebtoken.impl.DefaultClock;
-
 import java.util.Date;
 
 /**
@@ -11,8 +9,6 @@ import java.util.Date;
  */
 public interface Clock {
 
-    public static final Clock DEFAULT = new DefaultClock();
-
     /**
      * Returns the clock's current timestamp at the instant the method is invoked.
      *
diff --git a/src/main/java/io/jsonwebtoken/impl/DefaultClock.java b/src/main/java/io/jsonwebtoken/impl/DefaultClock.java
index 14d1eed7..0bf8171c 100644
--- a/src/main/java/io/jsonwebtoken/impl/DefaultClock.java
+++ b/src/main/java/io/jsonwebtoken/impl/DefaultClock.java
@@ -11,6 +11,11 @@ import java.util.Date;
  */
 public class DefaultClock implements Clock {
 
+    /**
+     * Default static instance that may be shared.  It is thread-safe.
+     */
+    public static final Clock INSTANCE = new DefaultClock();
+
     /**
      * Simply returns <code>new {@link Date}()</code>.
      *
diff --git a/src/main/java/io/jsonwebtoken/impl/DefaultJwtParser.java b/src/main/java/io/jsonwebtoken/impl/DefaultJwtParser.java
index 8f8c02c8..f8d3204a 100644
--- a/src/main/java/io/jsonwebtoken/impl/DefaultJwtParser.java
+++ b/src/main/java/io/jsonwebtoken/impl/DefaultJwtParser.java
@@ -70,7 +70,7 @@ public class DefaultJwtParser implements JwtParser {
 
     Claims expectedClaims = new DefaultClaims();
 
-    private Clock clock = Clock.DEFAULT;
+    private Clock clock = DefaultClock.INSTANCE;
 
     @Override
     public JwtParser requireIssuedAt(Date issuedAt) {