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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 (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 com.mongodb.async.SingleResultCallback;
import com.mongodb.binding.AsyncWriteBinding;
import com.mongodb.binding.WriteBinding;
import org.bson.BsonDocument;
import org.bson.BsonInt32;

import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.operation.CommandOperationHelper.VoidTransformer;
import static com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol;
import static com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocolAsync;

/**
 * Operation to drop a database in MongoDB.  The {@code execute} method throws MongoCommandFailureException if something goes wrong, but
 * it will not throw an Exception if the collection does not exist before trying to drop it.
 *
 * @since 3.0
 */
public class DropDatabaseOperation implements AsyncWriteOperation, WriteOperation {
    private static final BsonDocument DROP_DATABASE = new BsonDocument("dropDatabase", new BsonInt32(1));
    private final String databaseName;

    /**
     * Construct a new instance.
     *
     * @param databaseName the name of the database for the operation.
     */
    public DropDatabaseOperation(final String databaseName) {
        this.databaseName = notNull("databaseName", databaseName);
    }

    @Override
    public Void execute(final WriteBinding binding) {
        return executeWrappedCommandProtocol(binding, databaseName, DROP_DATABASE, new VoidTransformer());
    }

    @Override
    public void executeAsync(final AsyncWriteBinding binding, final SingleResultCallback callback) {
        executeWrappedCommandProtocolAsync(binding, databaseName, DROP_DATABASE, new VoidTransformer(), callback);
    }
}