Add toString method to codec registry-related classes

JAVA-4439

Author: jyemin

bson/src/main/org/bson/codecs/BsonCodecProvider.java

@@ -35,4 +35,9 @@ public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
         }
         return null;
     }
+
+    @Override
+    public String toString() {
+        return "BsonCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/BsonValueCodecProvider.java

@@ -170,4 +170,9 @@ private <T extends BsonValue> void addCodec(final Codec<T> codec) {
 
         DEFAULT_BSON_TYPE_CLASS_MAP = new BsonTypeClassMap(map);
     }
+
+    @Override
+    public String toString() {
+        return "BsonValueCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/DocumentCodecProvider.java

@@ -115,4 +115,9 @@ public int hashCode() {
         result = 31 * result + (valueTransformer != null ? valueTransformer.hashCode() : 0);
         return result;
     }
+
+    @Override
+    public String toString() {
+        return "DocumentCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/EnumCodecProvider.java

@@ -33,4 +33,9 @@ public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
         }
         return null;
     }
+
+    @Override
+    public String toString() {
+        return "EnumCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/IterableCodecProvider.java

@@ -108,4 +108,9 @@ public int hashCode() {
         result = 31 * result + (valueTransformer != null ? valueTransformer.hashCode() : 0);
         return result;
     }
+
+    @Override
+    public String toString() {
+        return "IterableCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/JsonObjectCodecProvider.java

@@ -35,4 +35,9 @@ public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
         }
         return null;
     }
+
+    @Override
+    public String toString() {
+        return "JsonObjectCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/MapCodecProvider.java

@@ -108,4 +108,9 @@ public int hashCode() {
         result = 31 * result + (valueTransformer != null ? valueTransformer.hashCode() : 0);
         return result;
     }
+
+    @Override
+    public String toString() {
+        return "MapCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/ValueCodecProvider.java

@@ -117,4 +117,9 @@ public boolean equals(final Object o) {
     public int hashCode() {
         return 0;
     }
+
+    @Override
+    public String toString() {
+        return "ValueCodecProvider{}";
+    }
 }

bson/src/main/org/bson/codecs/configuration/MapOfCodecsProvider.java

@@ -37,4 +37,10 @@ public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
         return (Codec<T>) codecsMap.get(clazz);
     }
 
+    @Override
+    public String toString() {
+        return "MapOfCodecsProvider{"
+                + "codecsMap=" + codecsMap
+                + '}';
+    }
 }

bson/src/main/org/bson/codecs/jsr310/Jsr310CodecProvider.java

@@ -56,4 +56,9 @@ private static void putCodec(final Codec<?> codec) {
     public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
         return (Codec<T>) JSR310_CODEC_MAP.get(clazz);
     }
+
+    @Override
+    public String toString() {
+        return "Jsr310CodecProvider{}";
+    }
 }