/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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 GNU
* Lesser General Public License for more details.
*/
package org.geotools.jdbc;
import java.io.IOException;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSource;
import org.geotools.data.AbstractDataStoreFactory;
import org.geotools.data.DataStore;
import org.geotools.data.Parameter;
import org.geotools.data.jdbc.datasource.DBCPDataSource;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.feature.type.FeatureTypeFactoryImpl;
import org.geotools.util.SimpleInternationalString;
import com.vividsolutions.jts.geom.GeometryFactory;
/**
* Abstract implementation of DataStoreFactory for jdbc datastores.
* <p>
*
* </p>
* @author Justin Deoliveira, The Open Planning Project
*
*
*
* @source $URL$
*/
public abstract class JDBCDataStoreFactory extends AbstractDataStoreFactory {
/** parameter for database type */
public static final Param DBTYPE = new Param("dbtype", String.class, "Type", true);
/** parameter for database host */
public static final Param HOST = new Param("host", String.class, "Host", true, "localhost");
/** parameter for database port */
public static final Param PORT = new Param("port", Integer.class, "Port", true);
/** parameter for database instance */
public static final Param DATABASE = new Param("database", String.class, "Database", false );
/** parameter for database schema */
public static final Param SCHEMA = new Param("schema", String.class, "Schema", false);
/** parameter for database user */
public static final Param USER = new Param("user", String.class,
"user name to login as");
/** parameter for database password */
public static final Param PASSWD = new Param("passwd", String.class,
new SimpleInternationalString("password used to login"), false, null, Collections
.singletonMap(Parameter.IS_PASSWORD, Boolean.TRUE));
/** parameter for namespace of the datastore */
public static final Param NAMESPACE = new Param("namespace", String.class, "Namespace prefix", false);
/** parameter for data source */
public static final Param DATASOURCE = new Param( "Data Source", DataSource.class, "Data Source", false );
/** Maximum number of connections in the connection pool */
public static final Param MAXCONN = new Param("max connections", Integer.class,
"maximum number of open connections", false, new Integer(10));
/** Minimum number of connections in the connection pool */
public static final Param MINCONN = new Param("min connections", Integer.class,
"minimum number of pooled connection", false, new Integer(1));
/** If connections should be validated before using them */
public static final Param VALIDATECONN = new Param("validate connections", Boolean .class,
"check connection is alive before using it", false, Boolean.FALSE);
/** If connections should be validated before using them */
public static final Param FETCHSIZE = new Param("fetch size", Integer.class,
"number of records read with each iteraction with the dbms", false, 1000);
/** Maximum amount of time the pool will wait when trying to grab a new connection **/
public static final Param MAXWAIT = new Param("Connection timeout", Integer.class,
"number of seconds the connection pool will wait before timing out attempting to get a new connection (default, 20 seconds)", false, 20);
/** Metadata table providing information about primary keys **/
public static final Param PK_METADATA_TABLE = new Param("Primary key metadata table", String.class,
"The optional table containing primary key structure and sequence associations. Can be expressed as 'schema.name' or just 'name'", false);
/** Number of prepared statements cached per connection (this param is exposed only by factories supporting prepared statements **/
public static final Param MAX_OPEN_PREPARED_STATEMENTS = new Param("Max open prepared statements", Integer.class,
"Maximum number of prepared statements kept open and cached for each connection in the pool. " +
"Set to 0 to have unbounded caching, to -1 to disable caching", false, 50);
/** expose primary key columns as attributes */
public static final Param EXPOSE_PK = new Param("Expose primary keys", Boolean.class, "Expose primary key columns as " +
"attributes of the feature type", false, false);
@Override
public String getDisplayName() {
return getDescription();
}
public boolean canProcess(Map params) {
if (!super.canProcess(params)) {
return false; // was not in agreement with getParametersInfo
}
return checkDBType(params);
}
protected boolean checkDBType(Map params) {
return checkDBType(params, getDatabaseID());
}
protected final boolean checkDBType(Map params, String dbtype) {
String type;
try {
type = (String) DBTYPE.lookUp(params);
if (dbtype.equals(type)) {
return true;
}
return false;
} catch (IOException e) {
return false;
}
}
public final JDBCDataStore createDataStore(Map params)
throws IOException {
JDBCDataStore dataStore = new JDBCDataStore();
// dialect
final SQLDialect dialect = createSQLDialect(dataStore);
dataStore.setSQLDialect(dialect);
// datasource
// check if the DATASOURCE parameter was supplied, it takes precendence
DataSource ds = (DataSource) DATASOURCE.lookUp( params );
if ( ds != null ) {
dataStore.setDataSource(ds);
}
else {
dataStore.setDataSource(createDataSource(params, dialect));
}
// fetch size
Integer fetchSize = (Integer) FETCHSIZE.lookUp(params);
if(fetchSize != null && fetchSize > 0)
dataStore.setFetchSize(fetchSize);
// namespace
String namespace = (String) NAMESPACE.lookUp(params);
if (namespace != null) {
dataStore.setNamespaceURI(namespace);
}
//database schema
String schema = (String) SCHEMA.lookUp(params);
if (schema != null) {
dataStore.setDatabaseSchema(schema);
}
// primary key finder lookup table location, if any
String metadataTable = (String) PK_METADATA_TABLE.lookUp(params);
if(metadataTable != null) {
MetadataTablePrimaryKeyFinder tableFinder = new MetadataTablePrimaryKeyFinder();
if(metadataTable.contains(".")) {
String[] parts = metadataTable.split("\\.");
if(parts.length > 2)
throw new IllegalArgumentException("The primary key metadata table format " +
"is either 'name' or 'schema.name'");
tableFinder.setTableSchema(parts[0]);
tableFinder.setTableName(parts[1]);
} else {
tableFinder.setTableSchema(metadataTable);
}
dataStore.setPrimaryKeyFinder(new CompositePrimaryKeyFinder(tableFinder,
new HeuristicPrimaryKeyFinder()));
}
// expose primary keys
Boolean exposePk = (Boolean) EXPOSE_PK.lookUp(params);
if(exposePk != null) {
dataStore.setExposePrimaryKeyColumns(exposePk);
}
// factories
dataStore.setFilterFactory(CommonFactoryFinder.getFilterFactory(null));
dataStore.setGeometryFactory(new GeometryFactory());
dataStore.setFeatureTypeFactory(new FeatureTypeFactoryImpl());
dataStore.setFeatureFactory(CommonFactoryFinder.getFeatureFactory(null));
dataStore.setDataStoreFactory(this);
//call subclass hook and return
return createDataStoreInternal(dataStore, params);
}
/**
* Subclass hook to do additional initialization of a newly created datastore.
* <p>
* Typically subclasses will want to override this method in the case where
* they provide additional datastore parameters, those should be processed
* here.
* </p>
* <p>
* This method is provided with an instance of the datastore. In some cases
* subclasses may wish to create a new instance of the datastore, for instance
* in order to wrap the original instance. This is supported but the new
* datastore must be returned from this method. If not is such the case this
* method should still return the original passed in.
*
* </p>
* @param dataStore The newly created datastore.
* @param params THe datastore parameters.
*
*/
protected JDBCDataStore createDataStoreInternal(JDBCDataStore dataStore, Map params)
throws IOException {
return dataStore;
}
public DataStore createNewDataStore(Map params) throws IOException {
throw new UnsupportedOperationException();
}
public final Param[] getParametersInfo() {
LinkedHashMap map = new LinkedHashMap();
setupParameters(map);
return (Param[]) map.values().toArray(new Param[map.size()]);
}
/**
* Sets up the database connection parameters.
* <p>
* Subclasses may extend, but should not override. This implementation
* registers the following parameters.
* <ul>
* <li>{@link #HOST}
* <li>{@link #PORT}
* <li>{@link #DATABASE}
* <li>{@link #SCHEMA}
* <li>{@link #USER}
* <li>{@link #PASSWD}
* </ul>
* Subclass implementation may remove any parameters from the map, or may
* overrwrite any parameters in the map.
* </p>
*
* @param parameters Map of {@link Param} objects.
*/
protected void setupParameters(Map parameters) {
// remember: when adding a new parameter here that is not connection related,
// add it to the JDBCJNDIDataStoreFactory class
parameters.put(DBTYPE.key,
new Param(DBTYPE.key, DBTYPE.type, DBTYPE.description, DBTYPE.required, getDatabaseID()));
parameters.put(HOST.key, HOST);
parameters.put(PORT.key, PORT);
parameters.put(DATABASE.key, DATABASE);
parameters.put(SCHEMA.key, SCHEMA);
parameters.put(USER.key, USER);
parameters.put(PASSWD.key, PASSWD);
parameters.put(NAMESPACE.key, NAMESPACE);
parameters.put(EXPOSE_PK.key, EXPOSE_PK);
parameters.put(MAXCONN.key, MAXCONN);
parameters.put(MINCONN.key, MINCONN);
parameters.put(FETCHSIZE.key, FETCHSIZE);
parameters.put(MAXWAIT.key, MAXWAIT);
if(getValidationQuery() != null)
parameters.put(VALIDATECONN.key, VALIDATECONN);
parameters.put(PK_METADATA_TABLE.key, PK_METADATA_TABLE);
}
/**
* Determines if the datastore is available.
* <p>
* Subclasses may with to override or extend this method. This implementation
* checks whether the jdbc driver class (provided by {@link #getDriverClassName()}
* can be loaded.
* </p>
*/
public boolean isAvailable() {
try {
Class.forName(getDriverClassName());
return true;
} catch (ClassNotFoundException e) {
return false;
}
}
/**
* Returns the implementation hints for the datastore.
* <p>
* Subclasses may override, this implementation returns <code>null</code>.
* </p>
*/
public Map<java.awt.RenderingHints.Key, ?> getImplementationHints() {
return null;
}
/**
* Returns a string to identify the type of the database.
* <p>
* Example: 'postgis'.
* </p>
*/
protected abstract String getDatabaseID();
/**
* Returns the fully qualified class name of the jdbc driver.
* <p>
* For example: org.postgresql.Driver
* </p>
*/
protected abstract String getDriverClassName();
/**
* Creates the dialect that the datastore uses for communication with the
* underlying database.
*
* @param dataStore The datastore.
*/
protected abstract SQLDialect createSQLDialect(JDBCDataStore dataStore);
/**
* Creates the datasource for the data store.
* <p>
* This method creates a {@link BasicDataSource} instance and populates it
* as follows:
* <ul>
* <li>poolPreparedStatements -> false
* <li>driverClassName -> {@link #getDriverClassName()}
* <li>url -> 'jdbc:<{@link #getDatabaseID()}>://<{@link #HOST}>/<{@link #DATABASE}>'
* <li>username -> <{@link #USER}>
* <li>password -> <{@link #PASSWD}>
* </ul>
* If different behaviour is needed, this method should be extended or
* overridden.
* </p>
*/
protected DataSource createDataSource(Map params, SQLDialect dialect) throws IOException {
BasicDataSource dataSource = createDataSource(params);
// some default data source behaviour
if(dialect instanceof PreparedStatementSQLDialect) {
dataSource.setPoolPreparedStatements(true);
// check if the dialect exposes the max prepared statements param
Map<String, Serializable> testMap = new HashMap<String, Serializable>();
setupParameters(testMap);
if(testMap.containsKey(MAX_OPEN_PREPARED_STATEMENTS.key)) {
Integer maxPreparedStatements = (Integer) MAX_OPEN_PREPARED_STATEMENTS.lookUp(params);
// limit prepared statements
if(maxPreparedStatements != null && maxPreparedStatements > 0)
dataSource.setMaxOpenPreparedStatements(maxPreparedStatements);
// disable statement caching fully if necessary
if(maxPreparedStatements != null && maxPreparedStatements < 0)
dataSource.setPoolPreparedStatements(false);
}
}
return new DBCPDataSource(dataSource);
}
/**
* DataSource access allowing SQL use: intended to allow client code to query available schemas.
* <p>
* This DataSource is the clients responsibility to close() when they are finished using it.
* </p>
* @param params Map of connection parameter.
* @return DataSource for SQL use
* @throws IOException
*/
public BasicDataSource createDataSource(Map params) throws IOException {
//create a datasource
BasicDataSource dataSource = new BasicDataSource();
// driver
dataSource.setDriverClassName(getDriverClassName());
// url
dataSource.setUrl(getJDBCUrl(params));
// username
String user = (String) USER.lookUp(params);
dataSource.setUsername(user);
// password
String passwd = (String) PASSWD.lookUp(params);
if (passwd != null) {
dataSource.setPassword(passwd);
}
// max wait
Integer maxWait = (Integer) MAXWAIT.lookUp(params);
if (maxWait != null && maxWait != -1) {
dataSource.setMaxWait(maxWait * 1000);
}
// connection pooling options
Integer minConn = (Integer) MINCONN.lookUp(params);
if ( minConn != null ) {
dataSource.setMinIdle(minConn);
}
Integer maxConn = (Integer) MAXCONN.lookUp(params);
if ( maxConn != null ) {
dataSource.setMaxActive(maxConn);
}
Boolean validate = (Boolean) VALIDATECONN.lookUp(params);
if(validate != null && validate && getValidationQuery() != null) {
dataSource.setTestOnBorrow(true);
dataSource.setValidationQuery(getValidationQuery());
}
// some datastores might need this
dataSource.setAccessToUnderlyingConnectionAllowed(true);
return dataSource;
}
/**
* Override this to return a good validation query (a very quick one, such as one that
* asks the database what time is it) or return null if the factory does not support
* validation.
* @return
*/
protected abstract String getValidationQuery();
/**
* Builds up the JDBC url in a jdbc:<database>://<host>:<port>/<dbname>
* Override if you need a different setup
* @param params
* @return
* @throws IOException
*/
protected String getJDBCUrl(Map params) throws IOException {
// jdbc url
String host = (String) HOST.lookUp(params);
Integer port = (Integer) PORT.lookUp(params);
String db = (String) DATABASE.lookUp(params);
String url = "jdbc:" + getDatabaseID() + "://" + host;
if ( port != null ) {
url += ":" + port;
}
if ( db != null ) {
url += "/" + db;
}
return url;
}
}