org.springframework.boot.autoconfigure.orm.jpa.DatabaseLookup.java Source code

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Here is the source code for org.springframework.boot.autoconfigure.orm.jpa.DatabaseLookup.java

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/*
 * Copyright 2012-2018 the original author or authors.
 *
 * 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 org.springframework.boot.autoconfigure.orm.jpa;

import java.util.Collections;
import java.util.EnumMap;
import java.util.Map;

import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.jdbc.DatabaseDriver;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.jdbc.support.MetaDataAccessException;
import org.springframework.orm.jpa.vendor.Database;

/**
 * Utility to lookup well known {@link Database Databases} from a {@link DataSource}.
 *
 * @author Edd Melndez
 * @author Phillip Webb
 */
final class DatabaseLookup {

    private static final Log logger = LogFactory.getLog(DatabaseLookup.class);

    private static final Map<DatabaseDriver, Database> LOOKUP;

    static {
        Map<DatabaseDriver, Database> map = new EnumMap<>(DatabaseDriver.class);
        map.put(DatabaseDriver.DERBY, Database.DERBY);
        map.put(DatabaseDriver.H2, Database.H2);
        map.put(DatabaseDriver.HSQLDB, Database.HSQL);
        map.put(DatabaseDriver.MYSQL, Database.MYSQL);
        map.put(DatabaseDriver.ORACLE, Database.ORACLE);
        map.put(DatabaseDriver.POSTGRESQL, Database.POSTGRESQL);
        map.put(DatabaseDriver.SQLSERVER, Database.SQL_SERVER);
        map.put(DatabaseDriver.DB2, Database.DB2);
        map.put(DatabaseDriver.INFORMIX, Database.INFORMIX);
        LOOKUP = Collections.unmodifiableMap(map);
    }

    private DatabaseLookup() {
    }

    /**
     * Return the most suitable {@link Database} for the given {@link DataSource}.
     * @param dataSource the source {@link DataSource}
     * @return the most suitable {@link Database}
     */
    public static Database getDatabase(DataSource dataSource) {
        if (dataSource == null) {
            return Database.DEFAULT;
        }
        try {
            String url = JdbcUtils.extractDatabaseMetaData(dataSource, "getURL");
            DatabaseDriver driver = DatabaseDriver.fromJdbcUrl(url);
            Database database = LOOKUP.get(driver);
            if (database != null) {
                return database;
            }
        } catch (MetaDataAccessException ex) {
            logger.warn("Unable to determine jdbc url from datasource", ex);
        }
        return Database.DEFAULT;
    }

}