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sql2java common class package

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package gu.sql2java.json;

import java.lang.reflect.Type;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.DefaultJSONParser;
import com.alibaba.fastjson.parser.JSONToken;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer;
import gu.sql2java.BaseBean;
import gu.sql2java.MapConverter;
import gu.sql2java.RowMetaData;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * implementation of BaseBean class for 
 * FastJson {@code com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer},

 * MAVEN dependencies:
 *  *		<dependency>
 *			<groupId>com.alibaba</groupId>
 *			<artifactId>fastjson</artifactId>
 *			<version>${fastjson.version}</version>
 *			<scope>provided</scope>
 *		</dependency>
 * 
 * 
 * @author guyadong
 *
 */
public class FastjsonDeserializer extends JavaBeanDeserializer {
	private final MapConverter converter;
	public FastjsonDeserializer(ParserConfig config, Class beanClass) {
		super(config, checkNotNull(beanClass,"beanClass is null"));
		converter = new MapConverter<>(beanClass, JSONObject.class);
	}
	public FastjsonDeserializer(Class beanClass) {
		this(ParserConfig.global, beanClass);
	}
	@SuppressWarnings("unchecked")
	@Override
	public  T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
		/** deserialze to JSONObject */
		JSONObject json = (JSONObject)super.deserialze(parser, JSONObject.class, fieldName);
		/** convert to BaseBean  */
		return (T) converter.fromRight(json);
	}

	@Override
	public int getFastMatchToken() {
		return JSONToken.LBRACE;
	}
	/**
	 * define FASTJSON deserializer for all class derived from BaseBean  
	 */
	public static void install() {
		for(RowMetaData metaData:RowMetaData.allMetaDataList()){
			ParserConfig.global.putDeserializer(
					metaData.beanType,
					new FastjsonDeserializer(metaData.beanType));
		}
	}

}