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The Java operations layer for the MongoDB Java Driver. Third parties can ' + 'wrap this layer to provide custom higher-level APIs

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/*
 * 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.internal.connection;

import com.mongodb.MongoInternalException;
import org.bson.BsonBinaryReader;
import org.bson.codecs.Decoder;
import org.bson.codecs.DecoderContext;
import org.bson.io.BsonInput;
import org.bson.io.ByteBufferBsonInput;

import java.util.ArrayList;
import java.util.List;

import static java.lang.String.format;

/**
 * An OP_REPLY message.
 *
 * This class is not part of the public API and may be removed or changed at any time
 */
public class ReplyMessage {

    private final ReplyHeader replyHeader;
    private final List documents;

    public ReplyMessage(final ResponseBuffers responseBuffers, final Decoder decoder, final long requestId) {
        this(responseBuffers.getReplyHeader(), requestId);

        if (replyHeader.getNumberReturned() > 0) {
            try (BsonInput bsonInput = new ByteBufferBsonInput(responseBuffers.getBodyByteBuffer().duplicate())) {
                while (documents.size() < replyHeader.getNumberReturned()) {
                    try (BsonBinaryReader reader = new BsonBinaryReader(bsonInput)) {
                        documents.add(decoder.decode(reader, DecoderContext.builder().build()));
                    }
                }
            } finally {
                responseBuffers.reset();
            }
        }
    }

    ReplyMessage(final ReplyHeader replyHeader, final long requestId) {
        if (requestId != replyHeader.getResponseTo()) {
            throw new MongoInternalException(format("The responseTo (%d) in the response does not match the requestId (%d) in the "
                                                    + "request", replyHeader.getResponseTo(), requestId));
        }
        this.replyHeader = replyHeader;

        documents = new ArrayList<>(replyHeader.getNumberReturned());
    }

    /**
     * Gets the reply header.
     *
     * @return the reply header
     */
    public ReplyHeader getReplyHeader() {
        return replyHeader;
    }

    /**
     * Gets the documents.
     *
     * @return the documents
     */
    public List getDocuments() {
        return documents;
    }
}