com.mongodb.client.model.changestream.ChangeStreamDocumentCodec Maven / Gradle / Ivy

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The MongoDB Java Driver uber-artifact, containing the legacy driver, the mongodb-driver, mongodb-driver-core, and bson
There is a newer version: 3.12.14
/*
 * Copyright 2008-present 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.client.model.changestream;

import com.mongodb.MongoNamespace;
import org.bson.BsonDocument;
import org.bson.BsonReader;
import org.bson.BsonTimestamp;
import org.bson.BsonWriter;
import org.bson.codecs.BsonDocumentCodec;
import org.bson.codecs.BsonTimestampCodec;
import org.bson.codecs.Codec;
import org.bson.codecs.DecoderContext;
import org.bson.codecs.EncoderContext;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.codecs.pojo.ClassModel;
import org.bson.codecs.pojo.ClassModelBuilder;
import org.bson.codecs.pojo.PojoCodecProvider;
import org.bson.codecs.pojo.PropertyModelBuilder;

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

@SuppressWarnings({"unchecked", "rawtypes"})
final class ChangeStreamDocumentCodec implements Codec> {

    private static final BsonDocumentCodec BSON_DOCUMENT_CODEC = new BsonDocumentCodec();
    private static final OperationTypeCodec OPERATION_TYPE_CODEC = new OperationTypeCodec();

    private final Codec> codec;

    ChangeStreamDocumentCodec(final Class fullDocumentClass, final CodecRegistry codecRegistry) {

        ClassModelBuilder classModelBuilder = ClassModel.builder(ChangeStreamDocument.class);
        ((PropertyModelBuilder) classModelBuilder.getProperty("clusterTime")).codec(new BsonTimestampCodec());
        ((PropertyModelBuilder) classModelBuilder.getProperty("documentKey")).codec(BSON_DOCUMENT_CODEC);
        ((PropertyModelBuilder) classModelBuilder.getProperty("fullDocument")).codec(codecRegistry.get(fullDocumentClass));
        ((PropertyModelBuilder) classModelBuilder.getProperty("resumeToken")).codec(BSON_DOCUMENT_CODEC);
        ((PropertyModelBuilder) classModelBuilder.getProperty("operationType")).codec(OPERATION_TYPE_CODEC);
        ClassModel changeStreamDocumentClassModel = classModelBuilder.build();

        PojoCodecProvider provider = PojoCodecProvider.builder()
                .register(MongoNamespace.class)
                .register(UpdateDescription.class)
                .register(changeStreamDocumentClassModel)
                .build();

        CodecRegistry registry = fromRegistries(fromProviders(provider), codecRegistry);
        this.codec = (Codec>) (Codec)
                registry.get(ChangeStreamDocument.class);
    }

    @Override
    public ChangeStreamDocument decode(final BsonReader reader, final DecoderContext decoderContext) {
        return codec.decode(reader, decoderContext);
    }

    @Override
    public void encode(final BsonWriter writer, final ChangeStreamDocument value, final EncoderContext encoderContext) {
        codec.encode(writer, value, encoderContext);
    }

    @Override
    public Class> getEncoderClass() {
        return (Class>) (Class) ChangeStreamDocument.class;
    }
}