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/*
* Copyright 2012-2021 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
*
* https://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.jdbc;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.Locale;
import java.util.function.Predicate;
import java.util.stream.Stream;
import javax.sql.DataSource;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.ConnectionCallback;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Connection details for {@link EmbeddedDatabaseType embedded databases}.
*
* @author Phillip Webb
* @author Dave Syer
* @author Stephane Nicoll
* @author Nidhi Desai
* @since 1.0.0
* @see #get(ClassLoader)
*/
public enum EmbeddedDatabaseConnection {
/**
* No Connection.
*/
NONE(null, null, null, (url) -> false),
/**
* H2 Database Connection.
*/
H2(EmbeddedDatabaseType.H2, DatabaseDriver.H2.getDriverClassName(),
"jdbc:h2:mem:%s;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE", (url) -> url.contains(":h2:mem")),
/**
* Derby Database Connection.
*/
DERBY(EmbeddedDatabaseType.DERBY, DatabaseDriver.DERBY.getDriverClassName(), "jdbc:derby:memory:%s;create=true",
(url) -> true),
/**
* HSQL Database Connection.
* @since 2.4.0
*/
HSQLDB(EmbeddedDatabaseType.HSQL, DatabaseDriver.HSQLDB.getDriverClassName(), "org.hsqldb.jdbcDriver",
"jdbc:hsqldb:mem:%s", (url) -> url.contains(":hsqldb:mem:"));
private final EmbeddedDatabaseType type;
private final String driverClass;
private final String alternativeDriverClass;
private final String url;
private final Predicate embeddedUrl;
EmbeddedDatabaseConnection(EmbeddedDatabaseType type, String driverClass, String url,
Predicate embeddedUrl) {
this(type, driverClass, null, url, embeddedUrl);
}
EmbeddedDatabaseConnection(EmbeddedDatabaseType type, String driverClass, String fallbackDriverClass, String url,
Predicate embeddedUrl) {
this.type = type;
this.driverClass = driverClass;
this.alternativeDriverClass = fallbackDriverClass;
this.url = url;
this.embeddedUrl = embeddedUrl;
}
/**
* Returns the driver class name.
* @return the driver class name
*/
public String getDriverClassName() {
return this.driverClass;
}
/**
* Returns the {@link EmbeddedDatabaseType} for the connection.
* @return the database type
*/
public EmbeddedDatabaseType getType() {
return this.type;
}
/**
* Returns the URL for the connection using the specified {@code databaseName}.
* @param databaseName the name of the database
* @return the connection URL
*/
public String getUrl(String databaseName) {
Assert.hasText(databaseName, "DatabaseName must not be empty");
return (this.url != null) ? String.format(this.url, databaseName) : null;
}
boolean isEmbeddedUrl(String url) {
return this.embeddedUrl.test(url);
}
boolean isDriverCompatible(String driverClass) {
return (driverClass != null
&& (driverClass.equals(this.driverClass) || driverClass.equals(this.alternativeDriverClass)));
}
/**
* Convenience method to determine if a given driver class name and url represent an
* embedded database type.
* @param driverClass the driver class
* @param url the jdbc url (can be {@code null})
* @return true if the driver class and url refer to an embedded database
* @since 2.4.0
*/
public static boolean isEmbedded(String driverClass, String url) {
if (driverClass == null) {
return false;
}
EmbeddedDatabaseConnection connection = getEmbeddedDatabaseConnection(driverClass);
if (connection == NONE) {
return false;
}
return (url == null || connection.isEmbeddedUrl(url));
}
private static EmbeddedDatabaseConnection getEmbeddedDatabaseConnection(String driverClass) {
return Stream.of(H2, HSQLDB, DERBY).filter((connection) -> connection.isDriverCompatible(driverClass))
.findFirst().orElse(NONE);
}
/**
* Convenience method to determine if a given data source represents an embedded
* database type.
* @param dataSource the data source to interrogate
* @return true if the data source is one of the embedded types
*/
public static boolean isEmbedded(DataSource dataSource) {
try {
return new JdbcTemplate(dataSource).execute(new IsEmbedded());
}
catch (DataAccessException ex) {
// Could not connect, which means it's not embedded
return false;
}
}
/**
* Returns the most suitable {@link EmbeddedDatabaseConnection} for the given class
* loader.
* @param classLoader the class loader used to check for classes
* @return an {@link EmbeddedDatabaseConnection} or {@link #NONE}.
*/
public static EmbeddedDatabaseConnection get(ClassLoader classLoader) {
for (EmbeddedDatabaseConnection candidate : EmbeddedDatabaseConnection.values()) {
if (candidate != NONE && ClassUtils.isPresent(candidate.getDriverClassName(), classLoader)) {
return candidate;
}
}
return NONE;
}
/**
* {@link ConnectionCallback} to determine if a connection is embedded.
*/
private static class IsEmbedded implements ConnectionCallback {
@Override
public Boolean doInConnection(Connection connection) throws SQLException, DataAccessException {
DatabaseMetaData metaData = connection.getMetaData();
String productName = metaData.getDatabaseProductName();
if (productName == null) {
return false;
}
productName = productName.toUpperCase(Locale.ENGLISH);
EmbeddedDatabaseConnection[] candidates = EmbeddedDatabaseConnection.values();
for (EmbeddedDatabaseConnection candidate : candidates) {
if (candidate != NONE && productName.contains(candidate.getType().name())) {
String url = metaData.getURL();
return (url == null || candidate.isEmbeddedUrl(url));
}
}
return false;
}
}
}
