/*
* Copyright 2004-2009 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.apache.lucene.store.jdbc.dialect;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.LinkedList;
import javax.sql.DataSource;
import org.apache.lucene.store.jdbc.JdbcStoreException;
import org.apache.lucene.store.jdbc.datasource.DataSourceUtils;
/**
* @author kimchy
*/
public class DialectResolver {
public static interface DatabaseMetaDataToDialectMapper {
Class<? extends Dialect> getDialect(DatabaseMetaData metaData) throws SQLException;
}
public static class DatabaseNameToDialectMapper implements DatabaseMetaDataToDialectMapper {
private String databaseName;
private Class<? extends Dialect> dialect;
public DatabaseNameToDialectMapper(String databaseName, Class<? extends Dialect> dialect) {
this.databaseName = databaseName;
this.dialect = dialect;
}
public Class<? extends Dialect> getDialect(DatabaseMetaData metaData) throws SQLException {
if (metaData.getDatabaseProductName().equals(databaseName)) {
return dialect;
}
return null;
}
}
public static class DatabaseNameStartsWithToDialectMapper implements DatabaseMetaDataToDialectMapper {
private String databaseName;
private Class<? extends Dialect> dialect;
public DatabaseNameStartsWithToDialectMapper(String databaseName, Class<? extends Dialect> dialect) {
this.databaseName = databaseName;
this.dialect = dialect;
}
public Class<? extends Dialect> getDialect(DatabaseMetaData metaData) throws SQLException {
if (metaData.getDatabaseProductName().startsWith(databaseName)) {
return dialect;
}
return null;
}
}
public static class DatabaseNameAndVersionToDialectMapper implements DatabaseMetaDataToDialectMapper {
private String databaseName;
private Class<? extends Dialect> dialect;
private int version;
public DatabaseNameAndVersionToDialectMapper(String databaseName, int version, Class<? extends Dialect> dialect) {
this.databaseName = databaseName;
this.dialect = dialect;
this.version = version;
}
public Class<? extends Dialect> getDialect(DatabaseMetaData metaData) throws SQLException {
if (metaData.getDatabaseProductName().equals(databaseName) && metaData.getDatabaseMajorVersion() == version) {
return dialect;
}
return null;
}
}
private LinkedList<DatabaseMetaDataToDialectMapper> mappers = new LinkedList<DatabaseMetaDataToDialectMapper>();
public DialectResolver() {
this(true);
}
public DialectResolver(boolean useDefaultMappers) {
if (!useDefaultMappers) {
return;
}
mappers.add(new DatabaseNameToDialectMapper("HSQL Database Engine", HSQLDialect.class));
mappers.add(new DatabaseNameToDialectMapper("DB2/NT", DB2Dialect.class));
mappers.add(new DatabaseNameToDialectMapper("MySQL", MySQLDialect.class));
mappers.add(new DatabaseNameToDialectMapper("PostgreSQL", PostgreSQLDialect.class));
mappers.add(new DatabaseNameStartsWithToDialectMapper("Microsoft SQL Server", SQLServerDialect.class));
mappers.add(new DatabaseNameToDialectMapper("Sybase SQL Server", SybaseDialect.class));
mappers.add(new DatabaseNameAndVersionToDialectMapper("Oracle", 8, Oracle8Dialect.class));
mappers.add(new DatabaseNameAndVersionToDialectMapper("Oracle", 9, Oracle9Dialect.class));
mappers.add(new DatabaseNameToDialectMapper("Oracle", OracleDialect.class));
}
public void addFirstMapper(DatabaseMetaDataToDialectMapper mapper) {
mappers.addFirst(mapper);
}
public void addLastMapper(DatabaseMetaDataToDialectMapper mapper) {
mappers.addLast(mapper);
}
public Dialect getDialect(DataSource dataSource) throws JdbcStoreException {
Connection conn = DataSourceUtils.getConnection(dataSource);
String databaseName;
int databaseMajorVersion;
int databaseMinorVersion;
String driverName;
try {
DatabaseMetaData metaData = conn.getMetaData();
databaseName = metaData.getDatabaseProductName();
databaseMajorVersion = metaData.getDatabaseMajorVersion();
databaseMinorVersion = metaData.getDatabaseMinorVersion();
driverName = metaData.getDriverName();
for (DatabaseMetaDataToDialectMapper mapper : mappers) {
Class<? extends Dialect> dialectClass = mapper.getDialect(metaData);
if (dialectClass == null) {
continue;
}
return dialectClass.newInstance();
}
} catch (Exception e) {
throw new JdbcStoreException("Failed to auto detect dialect", e);
} finally {
DataSourceUtils.releaseConnection(conn);
}
throw new JdbcStoreException("Failed to auto detect dialect, no match found for database [" + databaseName +
"] version [" + databaseMajorVersion + "/" + databaseMinorVersion + "] driver [" + driverName + "]");
}
}