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

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package com.github.yoojia.next.lang;

import com.github.yoojia.next.NextRequest;
import com.github.yoojia.next.NextResponse;

import java.lang.reflect.Method;

/**
 * @author YOOJIA.CHEN ([email protected])
 */
public final class ClassLoader {

    private final java.lang.ClassLoader mClassLoader;

    public ClassLoader() {
        mClassLoader = Thread.currentThread().getContextClassLoader();
    }

    public Class load(String className){
        try {
            return mClassLoader.loadClass(className);
        } catch (Exception e) {
            return null;
        }
    }

    public void checkConstructor(Class clazz, String name){
        try {
            clazz.getConstructor(); // 在自动生成对象时，需要一个无参数构造方法
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("A " + name + " MUST has a public NON-PARAMS constructor !", e);
        }
    }

    public  T newClassByName(String className){
        // 为内建模块class缩写恢复原类名
        if( ! className.contains(".")) {
            className = "com.github.yoojia.next." + className;
        }
        try {
            @SuppressWarnings("unchecked")
            final Class clazz = (Class) mClassLoader.loadClass(className);
            return clazz.newInstance();
        } catch (Exception e) {
            throw new RuntimeException("Cannot instance class: " + className, e);
        }
    }

    public boolean isSignatureMatched(Method method){
        final Class[] types = method.getParameterTypes();
        if(types.length < 2){
            return false;
        }
        boolean req = false, res = false;
        for (Class type : types) {
            req |= NextRequest.class.equals(type);
            res |= NextResponse.class.equals(type);
        }
        return req && res;
    }

}