VO 빌더

Builder.java

public class Builder<T>  {
	
	private T t;
	private Map<String, String> map;
	private MappingRule rule;
	private static final String SET = "set";
	
	public Builder(T clz) {
		map = new HashMap<String, String>();
		this.t = clz;
		this.rule = new DefultMappingRule();
	}
	
	public Builder(T clz, MappingRule rule) {
		map = new HashMap<String, String>();
		this.t = clz;
		this.rule = rule;
	}
	
	public Builder<T> set(String key, String value) {
		map.put(key, value);
		return this;
	}
	
	public T build() {
		setFieldFromMap(map, t, rule);
		return t;
	}
	
	/**
	 * 맵으로 받은 파리미터 값을 VO 맴머 필드에 set 해줌
	 * @param paramMap
	 * @param vo
	 * @throws IllegalAccessException
	 * @throws InvocationTargetException
	 */
	public void setFieldFromMap(Map<String, String> paramMap, Object vo, MappingRule func) {
		Class<?> c = vo.getClass();
		
		Field[] fields = c.getDeclaredFields();
		Method[] methods = c.getMethods();
		for (Method method:methods) {
			String name = method.getName();
			if (name.startsWith(SET)) {
				String key = func.getKeyFromMethodName(SET, name);
				//assertEquals("", key);
				try {
					method.invoke(vo, paramMap.get(key));
				} catch (IllegalAccessException e) {
				} catch (IllegalArgumentException e) {
				} catch (InvocationTargetException e) {
				}
			}
		}
	}
}

MappingRule.java

import static com.google.common.base.CaseFormat.*;
//guava 사용함
public interface MappingRule {
	String getKeyFromMethodName(String setOrGet, String name);
}

class FormUpperCamelToLowerUnder implements MappingRule{

	@Override
	public String getKeyFromMethodName(String setOrGet, String name) {
		String fieldName = name.replaceAll(setOrGet, "");
		String key = UPPER_CAMEL.to(LOWER_UNDERSCORE, fieldName);
		return key;
	}
	
}

class DefultMappingRule implements MappingRule{
	
	@Override
	public String getKeyFromMethodName(String setOrGet, String methodName) {
		String fieldName = methodName.replaceAll(setOrGet, "");
		String key = UPPER_CAMEL.to(LOWER_CAMEL, fieldName);
		return key;
	}
	
}

VO.java

public class VO {

	public static <T> Builder<T> builder(T t){
		return new Builder<T>(t);
	}

	public static <T> Builder<T> builder(T t, MappingRule rule){
		return new Builder<T>(t, rule);
	}

}