ibatis3 结合spring 扩展的 SqlSessionFactoryBean

有空补上注释

package com.starit.core.ibatis;

import java.io.IOException;
import java.io.Reader;

import javax.sql.DataSource;

import org.apache.ibatis.builder.xml.XMLConfigBuilder;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.mapping.Configuration;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.defaults.DefaultSqlSessionFactory;
import org.apache.ibatis.transaction.managed.ManagedTransactionFactory;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;

public class SqlSessionFactoryBean implements FactoryBean, InitializingBean {
	private String configLocation;

	private DataSource dataSource;
	
	private SqlSessionFactory sqlSessionFactory;
	
	private boolean useTransactionAwareDataSource = true;
	
	private String environmentId = "development";

	public void setEnvironmentId(String environmentId) {
		this.environmentId = environmentId;
	}

	public void setUseTransactionAwareDataSource(boolean useTransactionAwareDataSource) {
		this.useTransactionAwareDataSource = useTransactionAwareDataSource;
	}

	public Object getObject() throws Exception {
		return this.sqlSessionFactory;
	}

	public Class getObjectType() {
		return (this.sqlSessionFactory != null ? this.sqlSessionFactory.getClass() : SqlSessionFactory.class);
	}

	public boolean isSingleton() {
		return true;
	}

	public void afterPropertiesSet() throws Exception {
		this.sqlSessionFactory = this.buildSqlSessionFactory(configLocation);
	}
	
	protected SqlSessionFactory buildSqlSessionFactory(String configLocation) throws IOException {
		if (configLocation == null) {
			throw new IllegalArgumentException("configLocation entry is required");
		}
		DataSource dataSourceToUse = this.dataSource;
		if (this.useTransactionAwareDataSource && !(this.dataSource instanceof TransactionAwareDataSourceProxy)) {
			dataSourceToUse = new TransactionAwareDataSourceProxy(this.dataSource);
		}
		
		Environment environment = new Environment(environmentId, new ManagedTransactionFactory(), dataSourceToUse);
		
		Reader reader = Resources.getResourceAsReader(configLocation);
		XMLConfigBuilder parser = new XMLConfigBuilder(reader, null, null);
		Configuration config = parser.parse();
		config.setEnvironment(environment);
		
		return new DefaultSqlSessionFactory(config);
	}
	
	public DataSource getDataSource() {
		return dataSource;
	}

	public void setDataSource(DataSource dataSource) {
		this.dataSource = dataSource;
	}
	
	public void setConfigLocation(String configLocation) {
		this.configLocation = configLocation;
	}
}