EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.database;

import static eu.etaxonomy.cdm.common.XmlHelp.getBeansRoot;

import static eu.etaxonomy.cdm.common.XmlHelp.insertXmlBean;

import static eu.etaxonomy.cdm.common.XmlHelp.insertXmlValueProperty;

import static eu.etaxonomy.cdm.common.XmlHelp.saveToXml;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.Iterator;

import java.util.List;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.log4j.Logger;

import org.hibernate.cache.internal.NoCachingRegionFactory;

import org.hibernate.cache.spi.RegionFactory;

import org.jdom.Attribute;

import org.jdom.Element;

import org.springframework.beans.MutablePropertyValues;

import org.springframework.beans.factory.config.BeanDefinition;

import org.springframework.beans.factory.config.PropertiesFactoryBean;

import org.springframework.beans.factory.support.AbstractBeanDefinition;

import org.springframework.beans.factory.support.RootBeanDefinition;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import eu.etaxonomy.cdm.common.XmlHelp;

import eu.etaxonomy.cdm.config.CdmPersistentSourceUtils;

import eu.etaxonomy.cdm.config.CdmPersistentXMLSource;

import eu.etaxonomy.cdm.config.CdmPersistentXMLSource.CdmSourceProperties;

import eu.etaxonomy.cdm.config.ICdmPersistentSource;

import eu.etaxonomy.cdm.database.types.IDatabaseType;

/**

 * class to access an CdmDataSource

 */

public class CdmPersistentDataSource extends CdmDataSourceBase implements ICdmPersistentSource {

	private static final Logger logger = Logger.getLogger(CdmPersistentDataSource.class);

	public static final String DATASOURCE_BEAN_POSTFIX = "DataSource";

	private String beanName;

	private String database;

	/**

	 * This is strictly a <String, String> list of properties

	 */

	private Properties cdmSourceProperties;

	private List<Attribute> cdmSourceAttributes;

	/**

	 * The Datasource class that Spring will use to set up the connection to the database

	 */

	private static String dataSourceClassName = ComboPooledDataSource.class.getName();

	/**

	 * Returns the default CdmDataSource

	 * @return the default CdmDataSource

	 * @throws DataSourceNotFoundException

	 */

	public final static CdmPersistentDataSource NewDefaultInstance() throws DataSourceNotFoundException {

		return NewInstance("default");

	}

	/**

	 * Returns the default CdmDataSource

	 * @return the default CdmDataSource

	 * @throws DataSourceNotFoundException

	 */

	public final static CdmPersistentDataSource NewLocalHsqlInstance() throws DataSourceNotFoundException{

		return NewInstance("localDefaultHsql");

	}

	/**

	 * Returns the CdmDataSource named by strDataSource

	 * @param strDataSource

	 * @return

	 */

	public final static CdmPersistentDataSource NewInstance(String dataSourceName) throws DataSourceNotFoundException{

		if (exists(dataSourceName)){

			return new CdmPersistentDataSource(dataSourceName);

		}else{

			throw new DataSourceNotFoundException("Datasource not found: " + dataSourceName);

		}

	}

	/**

	 * Private Constructor. Use NewXXX factory methods for creating a new instance of CdmDataSource!

	 * @param strDataSource

	 */

	private CdmPersistentDataSource(String strDataSource){

		setName(strDataSource);

		loadSource(strDataSource);

	}

	private void loadSource(String strDataSource) {

		CdmPersistentXMLSource cdmPersistentXMLSource = CdmPersistentXMLSource.NewInstance(strDataSource, DATASOURCE_BEAN_POSTFIX);

		if(cdmPersistentXMLSource.getElement() != null) {

			beanName = cdmPersistentXMLSource.getBeanName();

			// properties from the persistent xml file

			cdmSourceProperties = cdmPersistentXMLSource.getCdmSourceProperties();

			cdmSourceAttributes = cdmPersistentXMLSource.getCdmSourceAttributes();

			// added database specific properties if they are null

			String url = getCdmSourceProperty(CdmSourceProperties.URL);

			DatabaseTypeEnum dbTypeEnum = getDatabaseType();

			if (dbTypeEnum != null && url != null){

				IDatabaseType dbType = dbTypeEnum.getDatabaseType();

				if (getCdmSourceProperty(CdmSourceProperties.DATABASE) == null){

					String database = dbType.getDatabaseNameByConnectionString(url);

					if(database != null) {

						setDatabase(database);

					}

				}

				if(getCdmSourceProperty(CdmSourceProperties.SERVER) == null){

					String server = dbType.getServerNameByConnectionString(url);

					if(server != null) {

						setServer(server);

					}

				}

				if(getCdmSourceProperty(CdmSourceProperties.PORT) == null){

					int port = dbType.getPortByConnectionString(url);

						if(port > 0) {

							setPort(port);

						} else {

							setPort(NULL_PORT);

						}

				}

			}

		}

	}

	@Override

    public String getBeanName() {

		return beanName;

	}

	@Override

	public String getDatabase() {

		return database;

	}

	@Override

	public void setDatabase(String database) {

		this.database = database;

		//update url string

		cdmSourceProperties.put(CdmSourceProperties.URL.toString(), getDatabaseType().getConnectionString(this));

	}

	@Override

	public void setServer(String server) {

		super.setServer(server);

		//update url string

		cdmSourceProperties.put(CdmSourceProperties.URL.toString(), getDatabaseType().getConnectionString(this));

	}

	@Override

	public void setPort(int port) {

		super.setPort(port);

		if(port != NULL_PORT) {

			//update url string

			cdmSourceProperties.put(CdmSourceProperties.URL.toString(), getDatabaseType().getConnectionString(this));

		}

	}

	@Override

	public String getFilePath() {

		return getCdmSourceProperty(CdmSourceProperties.FILEPATH);

	}

	@Override

	public H2Mode getMode() {

		return H2Mode.fromString(getCdmSourceProperty(CdmSourceProperties.MODE));

	}

	@Override

	public void setMode(H2Mode h2Mode) {

		cdmSourceProperties.put(CdmSourceProperties.MODE.toString(), h2Mode.name());

	}

	@Override

	public String getUsername(){

		return getCdmSourceProperty(CdmSourceProperties.USERNAME);

	}

	@Override

	public void setUsername(String username) {

		cdmSourceProperties.put(CdmSourceProperties.USERNAME.toString(), username);

	}

	@Override

	public String getPassword(){

		return getCdmSourceProperty(CdmSourceProperties.PASSWORD);

	}

	@Override

	public void setPassword(String password) {

		cdmSourceProperties.put(CdmSourceProperties.PASSWORD.toString(), password);

	}

	@Override

	public DatabaseTypeEnum getDatabaseType(){

		String strDriverClass = getCdmSourceProperty(CdmSourceProperties.DRIVER_CLASS);

		DatabaseTypeEnum dbType = DatabaseTypeEnum.byDriverClass(strDriverClass);

		return dbType;

	}

	public String getCdmSourceProperty(CdmSourceProperties property){

		return cdmSourceProperties.getProperty(property.toString(),null);

	}

	/**

	 * Returns a BeanDefinition object of type DataSource that contains

	 * datsource properties (url, username, password, ...)

	 * @return

	 */

	@SuppressWarnings("unchecked")

	@Override

	public BeanDefinition getDatasourceBean(){

		DatabaseTypeEnum dbtype =

				DatabaseTypeEnum.byDriverClass(getCdmSourceProperty(CdmSourceProperties.DRIVER_CLASS));

		AbstractBeanDefinition bd = new RootBeanDefinition(dbtype.getDataSourceClass());

		//attributes

		Iterator<Attribute> iterator = cdmSourceAttributes.iterator();

		while(iterator.hasNext()){

			Attribute attribute = iterator.next();

			if (attribute.getName().equals("lazy-init")){

				bd.setLazyInit(Boolean.valueOf(attribute.getValue()));

			}

			if (attribute.getName().equals("init-method")){

				bd.setInitMethodName(attribute.getValue());

			}

			if (attribute.getName().equals("destroy-method")){

				bd.setDestroyMethodName(attribute.getValue());

			}

			//Attribute attribute = iterator.next();

			//bd.setAttribute(attribute.getName(), attribute.getValue());

		}

		//properties

		MutablePropertyValues props = new MutablePropertyValues();

		Enumeration<String> keys = (Enumeration)cdmSourceProperties.keys();

		while (keys.hasMoreElements()){

			String key = keys.nextElement();

			props.addPropertyValue(key, cdmSourceProperties.getProperty(key));

		}

		bd.setPropertyValues(props);

		return bd;

	}

	/**

	 * @param hbm2dll

	 * @param showSql

	 * @return

	 */

	@Override

	public BeanDefinition getHibernatePropertiesBean(DbSchemaValidation hbm2dll){

		boolean showSql = false;

		boolean formatSql = false;

		boolean registerSearchListener = false;

		Class<? extends RegionFactory> cacheProviderClass = NoCachingRegionFactory.class;

		return getHibernatePropertiesBean(hbm2dll, showSql, formatSql, registerSearchListener, cacheProviderClass);

	}

	/**

	 * @param hbm2dll

	 * @param showSql

	 * @return

	 */

	@Override

	public BeanDefinition getHibernatePropertiesBean(DbSchemaValidation hbm2dll, Boolean showSql, Boolean formatSql, Boolean registerSearchListener, Class<? extends RegionFactory> cacheProviderClass){

		//Hibernate default values

		if (hbm2dll == null){

			hbm2dll = DbSchemaValidation.VALIDATE;

		}

		if (showSql == null){

			showSql = false;

		}

		if (formatSql == null){

			formatSql = false;

		}

		if (cacheProviderClass == null){

			cacheProviderClass = NoCachingRegionFactory.class;

		}

		if(registerSearchListener == null){

			registerSearchListener = false;

		}

		DatabaseTypeEnum dbtype = getDatabaseType();

		AbstractBeanDefinition bd = new RootBeanDefinition(PropertiesFactoryBean.class);

		MutablePropertyValues hibernateProps = new MutablePropertyValues();

		Properties props = new Properties();

		props.setProperty("hibernate.hbm2ddl.auto", hbm2dll.toString());

		props.setProperty("hibernate.dialect", dbtype.getHibernateDialectCanonicalName());

		props.setProperty("hibernate.cache.region.factory_class", cacheProviderClass.getName());

		props.setProperty("hibernate.show_sql", String.valueOf(showSql));

		props.setProperty("hibernate.format_sql", String.valueOf(formatSql));

		props.setProperty("hibernate.search.autoregister_listeners", String.valueOf(registerSearchListener));

		hibernateProps.addPropertyValue("properties",props);

		bd.setPropertyValues(hibernateProps);

		return bd;

	}

	/**

	 * Tests existing of the datsource in the according config  file.

	 * @return true if a datasource with the given name exists in the according datasource config file.

	 */

	public static boolean exists(String strDataSourceName){

		Element bean = CdmPersistentSourceUtils.getCdmSourceBeanXml(strDataSourceName, DATASOURCE_BEAN_POSTFIX);

		return (bean != null);

	}

	/**

	 * @param strDataSourceName

	 * @param dataSource

	 * @param code

	 * @return

	 * 			the updated dataSource, null if not succesful

	 */

	public static CdmPersistentDataSource update(String strDataSourceName,

			ICdmDataSource dataSource) throws DataSourceNotFoundException, IllegalArgumentException{

		CdmPersistentSourceUtils.delete(CdmPersistentSourceUtils.getBeanName(strDataSourceName,DATASOURCE_BEAN_POSTFIX));

		return save(strDataSourceName, dataSource);

	}

	/**

	 * Replace the persisted datasource with another one.

	 * Used primarily for renaming a datasource.

	 *

	 * @param strDataSourceName

	 * @param dataSource

	 * @return

	 * @throws DataSourceNotFoundException

	 * @throws IllegalArgumentException

	 */

	public static CdmPersistentDataSource replace(String strDataSourceName,

			ICdmDataSource dataSource) throws DataSourceNotFoundException, IllegalArgumentException{

		CdmPersistentSourceUtils.delete(CdmPersistentSourceUtils.getBeanName(strDataSourceName,DATASOURCE_BEAN_POSTFIX));

		return save(dataSource);

	}

	/**

	 * @param dataSource

	 * @return

	 * @throws IllegalArgumentException

	 */

	public static CdmPersistentDataSource save(ICdmDataSource dataSource)  throws IllegalArgumentException {

		return save(dataSource.getName(),dataSource);

	}

	/**

	 *

	 * @param strDataSourceName

	 * @param databaseTypeEnum

	 * @param server

	 * @param database

	 * @param port

	 * @param username

	 * @param password

	 * @param dataSourceClass

	 * @param initMethod

	 * @param destroyMethod

	 * @param startSilent

	 * @param startServer

	 * @param filePath

	 * @param mode

	 * @return

	 */

	private static CdmPersistentDataSource save(String strDataSourceName,

			DatabaseTypeEnum databaseTypeEnum,

			String server,

			String database,

			String port,

			String username,

			String password,

			Class<? extends DataSource> dataSourceClass,

			String initMethod,

			String destroyMethod,

			Boolean startSilent,

			Boolean startServer,

			String filePath,

			H2Mode mode

		){

		int portNumber = "".equals(port) ? databaseTypeEnum.getDefaultPort() : Integer.valueOf(port);

		ICdmDataSource dataSource = new CdmDataSource(databaseTypeEnum, server, database, portNumber, username, password, filePath, mode);

		//root

		Element root = getBeansRoot(CdmPersistentSourceUtils.getCdmSourceInputStream());

		if (root == null){

			return null;

		}

		//bean

		Element bean = XmlHelp.getFirstAttributedChild(root, "bean", "id", CdmPersistentSourceUtils.getBeanName(strDataSourceName, DATASOURCE_BEAN_POSTFIX));

		if (bean != null){

			bean.detach();  //delete old version if necessary

		}

		bean = insertXmlBean(root, CdmPersistentSourceUtils.getBeanName(strDataSourceName, DATASOURCE_BEAN_POSTFIX), dataSourceClass.getName());

		//attributes

		bean.setAttribute("lazy-init", "true");

		if (initMethod != null) {bean.setAttribute("init-method", initMethod);}

		if (destroyMethod != null) {bean.setAttribute("destroy-method", destroyMethod);}

		//set properties

		insertXmlValueProperty(bean, "driverClassName", databaseTypeEnum.getDriverClassName());

		insertXmlValueProperty(bean, "url", databaseTypeEnum.getConnectionString(dataSource));

		if (username != null) {insertXmlValueProperty(bean, "username", username );}

		if (password != null) {insertXmlValueProperty(bean, "password", password );}

		if (startSilent != null) {insertXmlValueProperty(bean, "startSilent", startSilent.toString() );}

		if (startServer != null) {insertXmlValueProperty(bean, "startServer", startServer.toString() );}

		if (filePath != null) {insertXmlValueProperty(bean, "filePath", filePath );}

		if (mode != null) {insertXmlValueProperty(bean, "mode", mode.toString() );}

		//save

		saveToXml(root.getDocument(),

				CdmPersistentSourceUtils.getResourceDirectory(),

				CdmPersistentXMLSource.CDMSOURCE_FILE_NAME,

				XmlHelp.prettyFormat );

		try {

			return NewInstance(strDataSourceName) ;

		} catch (DataSourceNotFoundException e) {

			logger.error("Error when saving datasource");

			return null;

		}

	}

	/**

	 * Saves a datasource to the datasource config file. If strDataSourceName differs a new dataSource

	 * will be created in config file. Use update() of real update functionality.

	 *

	 * @param strDataSourceName

	 * @param dataSource

	 * @return

	 */

	public static CdmPersistentDataSource save(String strDataSourceName,

			ICdmDataSource dataSource)  throws IllegalArgumentException{

		if(dataSource.getDatabaseType() == null){

			new IllegalArgumentException("Database type not specified");

		}

		if(dataSource.getDatabaseType().equals(DatabaseTypeEnum.H2)){

			Class<? extends DataSource> dataSourceClass =  LocalH2.class;

			if(dataSource.getMode() == null) {

				new IllegalArgumentException("H2 mode not specified");

			}

			return save(

					strDataSourceName,

					dataSource.getDatabaseType(),

					"localhost",

					getCheckedDataSourceParameter(dataSource.getDatabase()),

					dataSource.getDatabaseType().getDefaultPort() + "",

					getCheckedDataSourceParameter(dataSource.getUsername()),

					getCheckedDataSourceParameter(dataSource.getPassword()),

					dataSourceClass,

					null, null, null, null,

					dataSource.getFilePath(),

					dataSource.getMode()

					);

		}else{

			Class<? extends DataSource> dataSourceClass;

			try {

				dataSourceClass = (Class<? extends DataSource>) Class.forName(dataSourceClassName);

				String server = getCheckedDataSourceParameter(dataSource.getServer());

				CdmPersistentDataSource persistendDatasource =  save(

					strDataSourceName,

					dataSource.getDatabaseType(),

					getCheckedDataSourceParameter(dataSource.getServer()),

					getCheckedDataSourceParameter(dataSource.getDatabase()),

					dataSource.getPort() + "",

					getCheckedDataSourceParameter(dataSource.getUsername()),

					getCheckedDataSourceParameter(dataSource.getPassword()),

					dataSourceClass,

					null, null, null, null, null, null

				);

				return persistendDatasource;

			} catch (ClassNotFoundException e) {

				logger.error("DataSourceClass not found - stopping application", e);

				System.exit(-1);

			}

			// will never be reached

			return null;

		}

	}

	private static String getCheckedDataSourceParameter(String parameter) throws IllegalArgumentException{

		if(parameter != null) {

			return parameter;

		} else {

			throw new IllegalArgumentException("Non obsolete paramater was assigned a null value: " + parameter);

		}

	}

	/**

	 * Returns a list of all datasources stored in the datasource config file

	 * @return all existing data sources

	 */

	@SuppressWarnings("unchecked")

	static public List<CdmPersistentDataSource> getAllDataSources(){

		List<CdmPersistentDataSource> dataSources = new ArrayList<CdmPersistentDataSource>();

		Element root = getBeansRoot(CdmPersistentSourceUtils.getCdmSourceInputStream());

		if (root == null){

			return null;

		}else{

	    	List<Element> lsChildren  = root.getChildren("bean", root.getNamespace());

	    	for (Element elBean : lsChildren){

	    		String strId = elBean.getAttributeValue("id");

	    		if (strId != null && strId.endsWith(DATASOURCE_BEAN_POSTFIX)){

	    			strId = strId.replace(DATASOURCE_BEAN_POSTFIX, "");

	    			dataSources.add(new CdmPersistentDataSource(strId));

	    		}

	    	}

		}

		return dataSources;

	}

	@Override

	public boolean equals(Object obj){

		if (obj == null){

			return false;

		}else if (! CdmPersistentDataSource.class.isAssignableFrom(obj.getClass())){

			return false;

		}else{

			CdmPersistentDataSource dataSource = (CdmPersistentDataSource)obj;

			return (getName() == dataSource.getName());

		}

	}

	@Override

	public String toString(){

		if (getName() != null){

			return getName();

		}else{

			return null;

		}

	}

}