public static <T> T createFromArg(Class<T> clz, Object value) {
if (value == null) {
return null;
}
ClassMeta meta = ClassMeta.classMeta(clz);
List<ConstructorAccess> constructors = meta.oneArgumentConstructors();
if (constructors.size() == 0) {
return null;
} else if (constructors.size() == 1) {
ConstructorAccess constructorAccess = constructors.get(0);
Class<?> arg1Type = constructorAccess.parameterTypes()[0];
if (arg1Type.isInstance(value)) {
return (T) constructorAccess.create(value);
} else {
return (T) constructorAccess.create(coerce(arg1Type, value));
}
} else {
for (ConstructorAccess c : constructors) {
Class<?> arg1Type = c.parameterTypes()[0];
if (arg1Type.isInstance(value)) {
return (T) c.create(value);
}
}
for (ConstructorAccess c : constructors) {
Class<?> arg1Type = c.parameterTypes()[0];
if (arg1Type.isAssignableFrom(value.getClass())) {
return (T) c.create(value);
}
}
}
return null;
}
public static <T> T[] toArray(Class<T> componentType, Collection<T> collection) {
T[] array = (T[]) Array.newInstance(componentType, collection.size());
if (componentType.isAssignableFrom(getComponentType(collection))) {
return collection.toArray(array);
} else {
int index = 0;
for (Object o : collection) {
array[index] = Conversions.coerce(componentType, o);
index++;
}
return array;
}
}
public static <T> T coerceWithFlag(
TypeType coerceTo, Class<T> clz, boolean[] flag, Object value) {
flag[0] = true;
if (value == null) {
return null;
}
if (clz.isInstance(value)) {
return (T) value;
}
switch (coerceTo) {
case STRING:
case CHAR_SEQUENCE:
return (T) value.toString();
case INT:
case INTEGER_WRAPPER:
Integer i = toInt(value);
if (i == Integer.MIN_VALUE) {
flag[0] = false;
}
return (T) i;
case SHORT:
case SHORT_WRAPPER:
Short s = toShort(value);
if (s == Short.MIN_VALUE) {
flag[0] = false;
}
return (T) s;
case BYTE:
case BYTE_WRAPPER:
Byte by = toByte(value);
if (by == Byte.MIN_VALUE) {
flag[0] = false;
}
return (T) by;
case CHAR:
case CHAR_WRAPPER:
Character ch = toChar(value);
if (ch == (char) 0) {
flag[0] = false;
}
return (T) ch;
case LONG:
case LONG_WRAPPER:
Long l = toLong(value);
if (l == Long.MIN_VALUE) {
flag[0] = false;
}
return (T) l;
case DOUBLE:
case DOUBLE_WRAPPER:
Double d = toDouble(value);
if (d == Double.MIN_VALUE) {
flag[0] = false;
}
return (T) d;
case FLOAT:
case FLOAT_WRAPPER:
Float f = toFloat(value);
if (f == Float.MIN_VALUE) {
flag[0] = false;
}
return (T) f;
case DATE:
return (T) toDate(value);
case BIG_DECIMAL:
return (T) toBigDecimal(value);
case BIG_INT:
return (T) toBigInteger(value);
case CALENDAR:
return (T) toCalendar(toDate(value));
case BOOLEAN:
case BOOLEAN_WRAPPER:
return (T) (Boolean) toBooleanOrDie(value);
case MAP:
return (T) toMap(value);
case ARRAY:
case ARRAY_INT:
case ARRAY_BYTE:
case ARRAY_SHORT:
case ARRAY_FLOAT:
case ARRAY_DOUBLE:
case ARRAY_LONG:
case ARRAY_STRING:
case ARRAY_OBJECT:
return toPrimitiveArrayIfPossible(clz, value);
case COLLECTION:
return toCollection(clz, value);
case INSTANCE:
if (value instanceof Map) {
return MapObjectConversion.fromMap((Map<String, Object>) value, clz);
} else if (value instanceof List) {
return MapObjectConversion.fromList((List<Object>) value, clz);
} else if (clz.isInstance(value)) {
return (T) value;
} else {
ClassMeta meta = ClassMeta.classMeta(clz);
List<ConstructorAccess> constructors = meta.oneArgumentConstructors();
if (constructors.size() == 0) {
return null;
} else if (constructors.size() == 1) {
ConstructorAccess constructorAccess = constructors.get(0);
Class<?> arg1Type = constructorAccess.parameterTypes()[0];
if (arg1Type.isInstance(value)) {
return (T) constructorAccess.create(value);
} else {
return (T) constructorAccess.create(coerce(arg1Type, value));
}
} else {
for (ConstructorAccess c : constructors) {
Class<?> arg1Type = c.parameterTypes()[0];
if (arg1Type.isInstance(value)) {
return (T) c.create(value);
}
}
for (ConstructorAccess c : constructors) {
Class<?> arg1Type = c.parameterTypes()[0];
if (arg1Type.isAssignableFrom(value.getClass())) {
return (T) c.create(value);
}
}
flag[0] = false;
break;
}
}
case ENUM:
return (T) toEnum((Class<? extends Enum>) clz, value);
case CLASS:
return (T) toClass(value);
case TIME_ZONE:
return (T) toTimeZone(flag, value);
case UUID:
return (T) toUUID(flag, value);
case CURRENCY:
return (T) toCurrency(value);
case OBJECT:
return (T) value;
default:
flag[0] = false;
break;
}
return null;
}