JAVA-2931: Support nesting RawBsonArray in BsonDocument

In BsonValueCodecProvider, use the BsonArrayCodec to encode RawBsonArray
as well as BsonArray. This allows the default BsonDocumentCodec to encode
a BsonDocument that nests a RawBsonArray.

Author: jyemin

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

@@ -91,10 +91,6 @@ public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
             return (Codec<T>) codecs.get(clazz);
         }
 
-        if (clazz == BsonArray.class) {
-            return (Codec<T>) new BsonArrayCodec(registry);
-        }
-
         if (clazz == BsonJavaScriptWithScope.class) {
             return (Codec<T>) new BsonJavaScriptWithScopeCodec(registry.get(BsonDocument.class));
         }
@@ -115,6 +111,10 @@ public <T> Codec<T> get(final Class<T> clazz, final CodecRegistry registry) {
             return (Codec<T>) new BsonDocumentCodec(registry);
         }
 
+        if (BsonArray.class.isAssignableFrom(clazz)) {
+            return (Codec<T>) new BsonArrayCodec(registry);
+        }
+
         return null;
     }
 

bson/src/test/unit/org/bson/codecs/BsonValueCodecProviderSpecification.groovy

@@ -37,6 +37,7 @@ import org.bson.BsonString
 import org.bson.BsonSymbol
 import org.bson.BsonTimestamp
 import org.bson.BsonUndefined
+import org.bson.RawBsonArray
 import org.bson.RawBsonDocument
 import spock.lang.Specification
 
@@ -73,6 +74,7 @@ class BsonValueCodecProviderSpecification extends Specification {
         provider.get(BsonJavaScriptWithScope, codecRegistry).class == BsonJavaScriptWithScopeCodec
 
         provider.get(BsonArray, codecRegistry).class == BsonArrayCodec
+        provider.get(RawBsonArray, codecRegistry).class == BsonArrayCodec
 
         provider.get(BsonDocument, codecRegistry).class == BsonDocumentCodec
         provider.get(BsonDocumentWrapper, codecRegistry).class == BsonDocumentWrapperCodec