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package org.openl.util;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Set of utilities for manipulating with objects.
*
* @author Yury Molchan
*/
public class ObjectUtils {
/**
* Converts a string to the value of the given type.
*
* @param value an input string for conversion to an object value.
* @param type a type of the result.
* @return an object value of the given type.
*/
public static Object convert(String value, Class type) {
if (value == null) {
return null;
}
if (type.isEnum()) {
return Enum.valueOf((Class) type, value);
} else if (type.isAssignableFrom(String.class)) {
return value;
} else if (type.isArray()) {
final Class componentType = type.getComponentType();
String[] values = value.split(",");
Object res = Array.newInstance(componentType, values.length);
for (int i = 0; i < values.length; i++) {
Array.set(res, i, convert(values[i], componentType));
}
return res;
} else {
if (type.isPrimitive()) {
type = ClassUtils.primitiveToWrapper(type);
}
try {
try {
Method method = type.getDeclaredMethod("valueOf", String.class);
return method.invoke(null, value);
} catch (NoSuchMethodException e) {
try {
Method method = type.getDeclaredMethod("parse", CharSequence.class);
return method.invoke(null, value);
} catch (NoSuchMethodException e1) {
try {
Constructor constructor = type.getDeclaredConstructor(String.class);
return constructor.newInstance(value);
} catch (NoSuchMethodException e2) {
throw new IllegalArgumentException(String.format(
"Neither public constructor '%s(String s)', nor public static method 'valueOf(String s)', nor public static method 'parse(CharSequence s)' is not found.",
type.getTypeName()), e2);
}
}
}
} catch (IllegalAccessException | InvocationTargetException | InstantiationException e) {
throw new IllegalArgumentException(
String.format("Cannot convert '%s' string to '%s' type", value, type.getTypeName()),
e);
}
}
}
}