driver-legacy/src/main/com/mongodb/util/JSONSerializers.java
public static ObjectSerializer getLegacy() {

        ClassMapBasedObjectSerializer serializer = addCommonSerializers();

        serializer.addObjectSerializer(Date.class, new LegacyDateSerializer(serializer));
        serializer.addObjectSerializer(BSONTimestamp.class, new LegacyBSONTimestampSerializer(serializer));
        serializer.addObjectSerializer(Binary.class, new LegacyBinarySerializer());
        serializer.addObjectSerializer(byte[].class, new LegacyBinarySerializer());
        return serializer;
    }
public static ObjectSerializer getLegacy() {

        ClassMapBasedObjectSerializer serializer = addCommonSerializers();

        serializer.addObjectSerializer(Date.class, new LegacyDateSerializer(serializer));
        serializer.addObjectSerializer(BSONTimestamp.class, new LegacyBSONTimestampSerializer(serializer));
        serializer.addObjectSerializer(Binary.class, new LegacyBinarySerializer());
        serializer.addObjectSerializer(byte[].class, new LegacyBinarySerializer());
        return serializer;
    }
public static ObjectSerializer getLegacy ( ) { ClassMapBasedObjectSerializer serializer = addCommonSerializers ( ) ; serializer . addObjectSerializer ( Date . class , new LegacyDateSerializer ( serializer ) ) ; serializer . addObjectSerializer ( BSONTimestamp . class , new LegacyBSONTimestampSerializer ( serializer ) ) ; serializer . addObjectSerializer ( Binary . class , new LegacyBinarySerializer ( ) ) ; serializer . addObjectSerializer ( byte [ ] . class , new LegacyBinarySerializer ( ) ) ; return serializer ; }
Returns an {@code ObjectSerializer} that mostly conforms to the strict JSON format defined in
<a href="http://docs.mongodb.org/manual/reference/mongodb-extended-json/">extended JSON</a>, but with a few differences to keep
compatibility with previous versions of the driver.  Clients should generally prefer {@code getStrict} in preference to this method.

@return object serializer
@mongodb.driver.manual reference/mongodb-extended-json/ MongoDB Extended JSON
@see #getStrict()
Returns an { @code ObjectSerializer } that mostly conforms to the strict JSON format defined in <a href = http : // docs . mongodb . org / manual / reference / mongodb - extended - json / > extended JSON< / a > but with a few differences to keep compatibility with previous versions of the driver . Clients should generally prefer { @code getStrict } in preference to this method .