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The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson

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/*
 * Copyright (c) 2008-2014 MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mongodb.operation;

import org.bson.BsonDocument;
import org.bson.BsonDocumentWrapper;
import org.bson.BsonReader;
import org.bson.BsonType;
import org.bson.BsonValue;
import org.bson.codecs.BsonDocumentCodec;
import org.bson.codecs.Codec;
import org.bson.codecs.Decoder;
import org.bson.codecs.DecoderContext;
import org.bson.codecs.configuration.CodecRegistry;

import static org.bson.codecs.configuration.CodecRegistries.fromProviders;

class CommandResultDocumentCodec extends BsonDocumentCodec {
    private final Decoder payloadDecoder;
    private final String fieldContainingPayload;

    CommandResultDocumentCodec(final CodecRegistry registry, final Decoder payloadDecoder, final String fieldContainingPayload) {
        super(registry);
        this.payloadDecoder = payloadDecoder;
        this.fieldContainingPayload = fieldContainingPayload;
    }

    static  Codec create(final Decoder
 decoder, final String fieldContainingPayload) {
        CodecRegistry registry = fromProviders(new CommandResultCodecProvider(decoder, fieldContainingPayload));
        return registry.get(BsonDocument.class);
    }

    @Override
    protected BsonValue readValue(final BsonReader reader, final DecoderContext decoderContext) {
        if (reader.getCurrentName().equals(fieldContainingPayload)) {
            if (reader.getCurrentBsonType() == BsonType.DOCUMENT) {
                return new BsonDocumentWrapper(payloadDecoder.decode(reader, decoderContext), null);
            } else if (reader.getCurrentBsonType() == BsonType.ARRAY) {
                return new CommandResultArrayCodec(getCodecRegistry(), payloadDecoder).decode(reader, decoderContext);
            }
        }
        return super.readValue(reader, decoderContext);
    }
}