com.github.yoojia.next.lang.Primitives Maven / Gradle / Ivy

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package com.github.yoojia.next.lang;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;

/**
 * @author YOOJIA.CHEN ([email protected])
 * @version 1.0
 */
public class Primitives {

    private static final Logger LOGGER = LoggerFactory.getLogger(Primitives.class);

    public static Class getWrapClass(Class type){
        if(byte.class.equals(type) || Byte.class.equals(type)) return Byte.class;
        else if(short.class.equals(type) || Short.class.equals(type)) return Short.class;
        else if(int.class.equals(type) || Integer.class.equals(type)) return Integer.class;
        else if(long.class.equals(type) || Long.class.equals(type)) return Long.class;
        else if(float.class.equals(type) || Float.class.equals(type)) return Float.class;
        else if(double.class.equals(type) || Double.class.equals(type)) return Double.class;
        else if(char.class.equals(type) || Character.class.equals(type)) return Character.class;
        else if(boolean.class.equals(type) || Boolean.class.equals(type)) return Boolean.class;
        else if(String.class.equals(type)) return String.class;
        else throw new IllegalArgumentException("Not a primitive type: " + type);
    }

    @SuppressWarnings("unchecked")
    public static  T valueOf(String value, Class type){
        final Class wrapType = Primitives.getWrapClass(type);
        // 1. String
        if(String.class.equals(wrapType)){
            return (T) value;
        }
        // 2. Default value
        if(value == null || value.isEmpty()){
            value = Boolean.class.equals(wrapType) ? "false" : "0";
        }
        // 3. Call valueOf(String)
        try {
            final Method valueOfMethod = wrapType.getMethod("valueOf", String.class);
            return (T) valueOfMethod.invoke(wrapType, value);
        } catch (NoSuchMethodException e) {
            LOGGER.trace("CALL-VALUE-OF", e);
            throw new IllegalArgumentException(String.format("Type(%s) WITHOUT static method: valueOf(String) !", wrapType.getSimpleName()));
        } catch (Exception e) {
            LOGGER.trace("CALL-VALUE-OF", e);
            throw new IllegalArgumentException(String.format("Type(%s) fail to invoke method: valueOf(String), Reason: %s",
                    wrapType.getSimpleName(), Exceptions.message(e)));
        }
    }
}