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/*
* $Id$
*
* Firebird Open Source JavaEE Connector - JDBC Driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a source control history command.
*
* All rights reserved.
*/
package org.firebirdsql.jdbc;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.sql.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import javax.resource.ResourceException;
import org.firebirdsql.gds.*;
import org.firebirdsql.gds.impl.*;
import org.firebirdsql.jca.*;
import org.firebirdsql.logging.Logger;
import org.firebirdsql.logging.LoggerFactory;
/**
* The Jaybird JDBC Driver implementation for the Firebird database.
*
* @author David Jencks
* @author Mark Rotteveel
*/
public abstract class AbstractDriver implements FirebirdDriver {
private final static Logger log;
public static final String CHARSET = "charSet";
public static final String USE_TRANSLATION = "useTranslation";
public static final String USER = "user";
public static final String USER_NAME = "user_name";
public static final String PASSWORD = "password";
public static final String DATABASE = "database";
public static final String BLOB_BUFFER_LENGTH = "blob_buffer_length";
public static final String TPB_MAPPING = "tpb_mapping";
/*
* @todo implement the default subject for the
* standard connection.
*/
private final Map> mcfToDataSourceMap =
new ConcurrentHashMap>();
private final ReferenceQueue dataSourceReferenceQueue = new ReferenceQueue();
private final Object createDataSourceLock = new Object();
static {
log = LoggerFactory.getLogger(AbstractDriver.class, false);
try {
DriverManager.registerDriver(new FBDriver());
} catch (Exception ex) {
if (log != null)
log.error("Could not register with driver manager", ex);
}
}
/**
* Attempts to make a database connection to the given URL.
* The driver should return "null" if it realizes it is the wrong kind
* of driver to connect to the given URL. This will be common, as when
* the JDBC driver manager is asked to connect to a given URL it passes
* the URL to each loaded driver in turn.
*
* The driver should raise a SQLException if it is the right
* driver to connect to the given URL, but has trouble connecting to
* the database.
*
*
The java.util.Properties argument can be used to passed arbitrary
* string tag/value pairs as connection arguments.
* Normally at least "user" and "password" properties should be
* included in the Properties.
*
* @param url the URL of the database to which to connect
* @param info a list of arbitrary string tag/value pairs as
* connection arguments. Normally at least a "user" and
* "password" property should be included.
* @return a Connection object that represents a
* connection to the URL
* @exception SQLException if a database access error occurs
*/
public Connection connect(String url, final Properties info) throws SQLException {
if (url == null) {
throw new SQLException("url is null");
}
final GDSType type = GDSFactory.getTypeForProtocol(url);
if (type == null) {
return null;
}
final Properties mergedProperties = mergeProperties(url, info);
final Map normalizedInfo = FBDriverPropertyManager.normalize(url, mergedProperties);
try {
int qMarkIndex = url.indexOf('?');
if (qMarkIndex != -1) {
url = url.substring(0, qMarkIndex);
}
FBManagedConnectionFactory mcf = new FBManagedConnectionFactory(type);
String databaseURL = GDSFactory.getDatabasePath(type, url);
mcf.setDatabase(databaseURL);
for (Object o : normalizedInfo.entrySet()) {
Map.Entry entry = (Map.Entry) o;
mcf.setNonStandardProperty((String) entry.getKey(), (String) entry.getValue());
}
FBConnectionHelper.processTpbMapping(mcf.getGDS(), mcf, mergedProperties);
mcf = mcf.canonicalize();
FBDataSource dataSource = createDataSource(mcf);
return dataSource.getConnection(mcf.getUserName(), mcf.getPassword());
} catch(ResourceException resex) {
throw new FBSQLException(resex);
} catch(GDSException ex) {
throw new FBSQLException(ex);
}
}
private FBDataSource createDataSource(final FBManagedConnectionFactory mcf) throws ResourceException {
final FBConnectionProperties cacheKey = mcf.getCacheKey();
FBDataSource dataSource = dataSourceFromCache(cacheKey);
if (dataSource != null) return dataSource;
synchronized (createDataSourceLock) {
// Obtain again
dataSource = dataSourceFromCache(cacheKey);
if (dataSource == null) {
dataSource = (FBDataSource) mcf.createConnectionFactory();
mcfToDataSourceMap.put(cacheKey,
new SoftReference(dataSource, dataSourceReferenceQueue));
}
}
cleanDataSourceCache();
return dataSource;
}
/**
* Removes cleared references from the {@link #mcfToDataSourceMap} cache.
*/
private void cleanDataSourceCache() {
Reference reference;
while ((reference = dataSourceReferenceQueue.poll()) != null) {
mcfToDataSourceMap.values().remove(reference);
}
}
private FBDataSource dataSourceFromCache(final FBConnectionProperties cacheKey) {
final SoftReference dataSourceReference = mcfToDataSourceMap.get(cacheKey);
return dataSourceReference != null ? dataSourceReference.get() : null;
}
public FirebirdConnection connect(FirebirdConnectionProperties properties) throws SQLException {
GDSType type = GDSType.getType(properties.getType());
if (type == null) {
type = GDSFactory.getDefaultGDS().getType();
}
try {
FBManagedConnectionFactory mcf = new FBManagedConnectionFactory(type);
mcf = mcf.canonicalize();
FBDataSource dataSource = createDataSource(mcf);
return (FirebirdConnection)dataSource.getConnection(mcf.getUserName(), mcf.getPassword());
} catch(ResourceException ex) {
throw new FBSQLException(ex);
}
}
public FirebirdConnectionProperties newConnectionProperties() {
return new FBConnectionProperties();
}
/**
* Returns true if the driver thinks that it can open a connection
* to the given URL. Typically drivers will return true if they
* understand the subprotocol specified in the URL and false if
* they don't.
*
* @param url the URL of the database
* @return true if this driver can connect to the given URL
* @exception SQLException if a database access error occurs
*/
public boolean acceptsURL(String url) throws SQLException {
if (url == null) {
throw new SQLException("url is null");
}
Set protocols = GDSFactory.getSupportedProtocols();
for (Iterator iter = protocols.iterator(); iter.hasNext();) {
String protocol = (String) iter.next();
if (url.startsWith(protocol))
return true;
}
return false;
}
/**
* Gets information about the possible properties for this driver.
* The getPropertyInfo method is intended to allow a generic GUI tool to
* discover what properties it should prompt a human for in order to get
* enough information to connect to a database. Note that depending on
* the values the human has supplied so far, additional values may become
* necessary, so it may be necessary to iterate though several calls
* to getPropertyInfo.
*
* @param url the URL of the database to which to connect
* @param info a proposed list of tag/value pairs that will be sent on
* connect open
* @return an array of DriverPropertyInfo objects describing possible
* properties. This array may be an empty array if no properties
* are required.
* @exception SQLException if a database access error occurs
* TODO check the correctness of implementation
* TODO convert parameters into constants
*/
public DriverPropertyInfo[] getPropertyInfo(String url,
Properties info) throws SQLException {
return FBDriverPropertyManager.getDriverPropertyInfo(info);
}
/**
* Gets the driver's major version number. Initially this should be 1.
* @return this driver's major version number
*/
public int getMajorVersion() {
return 2;
}
/**
* Gets the driver's minor version number. Initially this should be 0.
* @return this driver's minor version number
*/
public int getMinorVersion() {
return 2;
}
/**
* Reports whether this driver is a genuine JDBC
* COMPLIANTTM driver.
* A driver may only report true here if it passes the JDBC compliance
* tests; otherwise it is required to return false.
*
* JDBC compliance requires full support for the JDBC API and full support
* for SQL 92 Entry Level. It is expected that JDBC compliant drivers will
* be available for all the major commercial databases.
*
* This method is not intended to encourage the development of non-JDBC
* compliant drivers, but is a recognition of the fact that some vendors
* are interested in using the JDBC API and framework for lightweight
* databases that do not support full database functionality, or for
* special databases such as document information retrieval where a SQL
* implementation may not be feasible.
*/
public boolean jdbcCompliant() {
return true;
}
/**
* Merges the properties from the JDBC URL and properties object.
*
* If a property is present in both, the property specified in the JDBC url takes precedence.
*
*
* @param jdbcUrl JDBC Url
* @param connectionProperties Properties object
* @return Map with connection properties
*/
private static Properties mergeProperties(String jdbcUrl, Properties connectionProperties) {
Properties mergedProperties = new Properties();
if (connectionProperties != null) {
for (String propertyName : connectionProperties.stringPropertyNames()) {
mergedProperties.setProperty(propertyName, connectionProperties.getProperty(propertyName));
}
}
convertUrlParams(jdbcUrl, mergedProperties);
return mergedProperties;
}
/**
* Extract properties specified as URL parameter into the specified map of properties.
*
* @param url
* specified URL.
* @param info
* instance of {@link Map} into which values should
* be extracted.
*/
private static void convertUrlParams(String url, Properties info) {
if (url == null) {
return;
}
int iQuestionMark = url.indexOf("?");
if (iQuestionMark == -1) {
return;
}
String propString = url.substring(iQuestionMark + 1);
StringTokenizer st = new StringTokenizer(propString, "&;");
while (st.hasMoreTokens()) {
String propertyString = st.nextToken();
int iIs = propertyString.indexOf("=");
if (iIs > -1) {
String property = propertyString.substring(0, iIs);
String value = propertyString.substring(iIs + 1);
info.setProperty(property, value);
} else {
info.setProperty(propertyString, "");
}
}
}
}