@SuppressWarnings("unchecked")
private <F, T> Castor<F, T> find(Mirror<F> from, Class<T> toType) {
Mirror<T> to = Mirror.me(toType, extractor);
Class<?>[] fets = from.extractTypes();
Class<?>[] tets = to.extractTypes();
for (Class<?> ft : fets) {
for (Class<?> tt : tets) {
if (map.containsKey(Castor.fetchHash(ft, tt))) {
return (Castor<F, T>) map.get(Castor.fetchHash(ft, tt));
}
}
}
return null;
}
/**
* 转换一个 POJO 从一个指定的类型到另外的类型
*
* @param src 源对象
* @param fromType 源对象类型
* @param toType 目标类型
* @param args 转换时参数。有些 Castor 可能需要这个参数，比如 Array2Map
* @return 目标对象
* @throws FailToCastObjectException 如果没有找到转换器，或者转换失败
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public <F, T> T cast(Object src, Class<F> fromType, Class<T> toType, String... args)
throws FailToCastObjectException {
if (null == src) {
// 原生数据的默认值
if (toType.isPrimitive()) {
if (toType == int.class) return (T) Integer.valueOf(0);
else if (toType == long.class) return (T) Long.valueOf(0L);
else if (toType == byte.class) return (T) Byte.valueOf((byte) 0);
else if (toType == short.class) return (T) Short.valueOf((short) 0);
else if (toType == float.class) return (T) Float.valueOf(.0f);
else if (toType == double.class) return (T) Double.valueOf(.0);
else if (toType == boolean.class) return (T) Boolean.FALSE;
else if (toType == char.class) return (T) Character.valueOf(' ');
throw Lang.impossible();
}
// 是对象，直接返回 null
return null;
}
if (fromType == toType || toType == null || fromType == null) return (T) src;
if (fromType.getName().equals(toType.getName())) return (T) src;
if (toType.isAssignableFrom(fromType)) return (T) src;
Mirror<?> from = Mirror.me(fromType, extractor);
if (from.canCastToDirectly(toType)) // Use language built-in cases
return (T) src;
Castor c = find(from, toType);
if (null == c)
throw new FailToCastObjectException(
String.format(
"Can not find castor for '%s'=>'%s' in (%d) because:\n%s",
fromType.getName(), toType.getName(), map.size(), "Fail to find matched castor"));
try {
return (T) c.cast(src, toType, args);
} catch (FailToCastObjectException e) {
throw e;
} catch (Exception e) {
throw new FailToCastObjectException(
String.format(
"Fail to cast from <%s> to <%s> for {%s} because:\n%s:%s",
fromType.getName(),
toType.getName(),
src,
e.getClass().getSimpleName(),
e.getMessage()),
Lang.unwrapThrow(e));
}
}
/**
* 填充 map .<br>
* 在map中使用hash值来做为key来进行存储
*
* @param klass
* @param settingMap
* @throws InstantiationException
* @throws IllegalAccessException
* @throws IllegalArgumentException
* @throws InvocationTargetException
*/
private void fillMap(Class<?> klass, HashMap<Class<?>, Method> settingMap)
throws InstantiationException, IllegalAccessException, IllegalArgumentException,
InvocationTargetException {
Castor<?, ?> castor = (Castor<?, ?>) klass.newInstance();
if (!map.containsKey(castor.hashCode())) {
map.put(castor.hashCode(), castor);
}
Method m = settingMap.get(castor.getClass());
if (null == m) {
for (Entry<Class<?>, Method> entry : settingMap.entrySet()) {
Class<?> cc = entry.getKey();
if (cc.isAssignableFrom(klass)) {
m = settingMap.get(cc);
break;
}
}
}
if (null != m) m.invoke(setting, castor);
}