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  package org.apache.cayenne.configuration.runtime;
  
  import java.sql.Driver;
  
  import javax.sql.DataSource;
  
  import org.apache.cayenne.ConfigurationException;
  import org.apache.cayenne.configuration.Constants;
  import org.apache.cayenne.configuration.DataNodeDescriptor;
  import org.apache.cayenne.configuration.RuntimeProperties;
  import org.apache.cayenne.datasource.DataSourceBuilder;
  import org.apache.cayenne.datasource.UnmanagedPoolingDataSource;
  import org.apache.cayenne.di.AdhocObjectFactory;
  import org.apache.cayenne.di.Inject;
  
  /**
   * A DataSourceFactrory that creates a DataSource based on system properties.
   * Properties can be set per domain/node name or globally, applying to all nodes
   * without explicit property set. The following properties are supported:
   * <ul>
   * <li>cayenne.jdbc.driver[.domain_name.node_name]
   * <li>cayenne.jdbc.url[.domain_name.node_name]
   * <li>cayenne.jdbc.username[.domain_name.node_name]
   * <li>cayenne.jdbc.password[.domain_name.node_name]
   * <li>cayenne.jdbc.min.connections[.domain_name.node_name]
   * <li>cayenne.jdbc.max.conections[.domain_name.node_name]
   * </ul>
   * At least url and driver properties must be specified for this factory to
   * return a valid DataSource.
   * 
   * @since 3.1
   */
  public class PropertyDataSourceFactory implements DataSourceFactory {
  
  	@Inject
  	protected RuntimeProperties properties;
  
  	@Inject
  	private AdhocObjectFactory objectFactory;
  
  	@Override
  	public DataSource getDataSource(DataNodeDescriptor nodeDescriptor) throws Exception {
  
  		String suffix = "." + nodeDescriptor.getDataChannelDescriptor().getName() + "." + nodeDescriptor.getName();
  
  		String driverClass = getProperty(Constants.JDBC_DRIVER_PROPERTY, suffix);
  		String url = getProperty(Constants.JDBC_URL_PROPERTY, suffix);
  		String username = getProperty(Constants.JDBC_USERNAME_PROPERTY, suffix);
  		String password = getProperty(Constants.JDBC_PASSWORD_PROPERTY, suffix);
  		int minConnections = getIntProperty(Constants.JDBC_MIN_CONNECTIONS_PROPERTY, suffix, 1);
  		int maxConnections = getIntProperty(Constants.JDBC_MAX_CONNECTIONS_PROPERTY, suffix, 1);
  		long maxQueueWaitTime = properties.getLong(Constants.JDBC_MAX_QUEUE_WAIT_TIME,
  				UnmanagedPoolingDataSource.MAX_QUEUE_WAIT_DEFAULT);
  		String validationQuery = properties.get(Constants.JDBC_VALIDATION_QUERY_PROPERTY);
  
  		Driver driver = objectFactory.<Driver>getJavaClass(driverClass).getDeclaredConstructor().newInstance();
  		return DataSourceBuilder.url(url).driver(driver).userName(username).password(password)
  				.pool(minConnections, maxConnections).maxQueueWaitTime(maxQueueWaitTime)
  				.validationQuery(validationQuery).build();
  	}
  
  	protected int getIntProperty(String propertyName, String suffix, int defaultValue) {
  		String string = getProperty(propertyName, suffix);
  
  		if (string == null) {
  			return defaultValue;
  		}
  
  		try {
  			return Integer.parseInt(string);
  		} catch (NumberFormatException e) {
  			throw new ConfigurationException("Invalid int property '%s': '%s'", propertyName, string);
  		}
  	}
  
  	protected String getProperty(String propertyName, String suffix) {
  		String value = properties.get(propertyName + suffix);
  		return value != null ? value : properties.get(propertyName);
  	}
  }
  