/**
 * Copyright 1996-2014 FoxBPM ORG.
 *
 * 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
 * 
 *      http://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.
 * 
 * @author ych
 */
package org.foxbpm.engine.impl.util;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.foxbpm.engine.ProcessEngineManagement;
import org.foxbpm.engine.impl.Context;
import org.foxbpm.engine.impl.ProcessEngineConfigurationImpl;

/**
 * 数据源工具类
 * @author ych
 *
 */
public class DBUtils {

	public static DataSource getDataSource(){
		return getDataSource(null);
	}
	public static DataSource getDataSource(String key){
		ProcessEngineConfigurationImpl processEngineConfig = Context.getProcessEngineConfiguration();
		if(processEngineConfig == null){
			processEngineConfig = ProcessEngineManagement.getDefaultProcessEngine().getProcessEngineConfiguration();
		}
		return processEngineConfig.getDataSource();
	}
	public static Connection getConnection(){
		return getConnection(null);
	}
	public static Connection getConnection(String key){
		DataSource dataSource = getDataSource(key);
		if(dataSource == null){
			throw ExceptionUtil.getException("没有可用的数据源配置！");
		}
		try {
			return dataSource.getConnection();
		} catch (SQLException e) {
			 throw ExceptionUtil.getException("获取数据库连接："+key+" 出错",e);
		}
	}
}