org.apache.calcite.adapter.mongodb.MongoSchemaFactory.java Source code

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Here is the source code for org.apache.calcite.adapter.mongodb.MongoSchemaFactory.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.calcite.adapter.mongodb;

import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.SchemaFactory;
import org.apache.calcite.schema.SchemaPlus;

import com.mongodb.AuthenticationMechanism;
import com.mongodb.MongoClientOptions;
import com.mongodb.MongoCredential;

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

/**
 * Factory that creates a {@link MongoSchema}.
 *
 * <p>Allows a custom schema to be included in a model.json file.</p>
 */
public class MongoSchemaFactory implements SchemaFactory {
    // public constructor, per factory contract
    public MongoSchemaFactory() {
    }

    public Schema create(SchemaPlus parentSchema, String name, Map<String, Object> operand) {
        final String host = (String) operand.get("host");
        final String database = (String) operand.get("database");
        final String authMechanismName = (String) operand.get("authMechanism");

        final MongoClientOptions.Builder options = MongoClientOptions.builder();

        final List<MongoCredential> credentials = new ArrayList<>();
        if (authMechanismName != null) {
            final MongoCredential credential = createCredentials(operand);
            credentials.add(credential);
        }

        return new MongoSchema(host, database, credentials, options.build());
    }

    private MongoCredential createCredentials(Map<String, Object> map) {
        final String authMechanismName = (String) map.get("authMechanism");
        final AuthenticationMechanism authenticationMechanism = AuthenticationMechanism
                .fromMechanismName(authMechanismName);
        final String username = (String) map.get("username");
        final String authDatabase = (String) map.get("authDatabase");
        final String password = (String) map.get("password");

        switch (authenticationMechanism) {
        case PLAIN:
            return MongoCredential.createPlainCredential(username, authDatabase, password.toCharArray());
        case SCRAM_SHA_1:
            return MongoCredential.createScramSha1Credential(username, authDatabase, password.toCharArray());
        case GSSAPI:
            return MongoCredential.createGSSAPICredential(username);
        case MONGODB_CR:
            return MongoCredential.createMongoCRCredential(username, authDatabase, password.toCharArray());
        case MONGODB_X509:
            return MongoCredential.createMongoX509Credential(username);
        }
        throw new IllegalArgumentException("Unsupported authentication mechanism " + authMechanismName);
    }
}

// End MongoSchemaFactory.java