求对多if else的重构方法

Question

这段代码摘自我的blog：http://loin.iteye.com/admin/blogs/745323
感觉这种多if else的代码太丑了，请问如何重构
/**
* 返回参数的sql类型，这段代码很丑，如何改
*
* @param prepareParam
* @return
*/
private static int getType(Object prepareParam) {
// TODO Auto-generated method stub
if (prepareParam == null)
return Types.NULL;
if (prepareParam instanceof String) {
return Types.VARCHAR;
} else if (prepareParam instanceof Boolean) {
return Types.BOOLEAN;
} else if (prepareParam instanceof Integer) {
return Types.INTEGER;
} else if (prepareParam instanceof Long) {
return Types.BIGINT;
} else if (prepareParam instanceof Float) {
return Types.FLOAT;
} else if (prepareParam instanceof Double) {
return Types.DOUBLE;
} else if (prepareParam instanceof BigDecimal) {
return Types.NUMERIC;
} else if (prepareParam instanceof Date) {
return Types.TIMESTAMP;
} else if (prepareParam instanceof Short) {
return Types.SMALLINT;
} else if (prepareParam instanceof InputStream) {
return Types.BINARY;
} else {
throw new RuntimeException("没有此类型");
}
}
谢谢

Answer 1

[code="java"]
static enum FieldType {
NULL, VARCHAR, BOOLEAN, INTEGER, BIGINT, FLOAT, DOUBLE, NUMERIC, TIMESTAMP, SMALLINT, BINARY
}

private static FieldType getType(Object prepareParam) {
if (prepareParam == null)
return FieldType.NULL;
return FieldType.valueOf(prepareParam.getClass().getSimpleName().toUpperCase());//找不到对应的类型，valueOf会参数异常错误：IllegalArgumentException
}
[/code]

枚举是最好的方式