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package com.alibaba.jvm.sandbox.agent;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

/**
 * 加载Sandbox用的ClassLoader
 * Created by [email protected] on 2016/10/26.
 */
class SandboxClassLoader extends URLClassLoader {

    private final String namespace;
    private final String path;

    SandboxClassLoader(final String namespace,
                       final String sandboxCoreJarFilePath) throws MalformedURLException {
        super(new URL[]{new URL("file:" + sandboxCoreJarFilePath)});
        this.namespace = namespace;
        this.path = sandboxCoreJarFilePath;
    }

    @Override
    protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
        final Class loadedClass = findLoadedClass(name);
        if (loadedClass != null) {
            return loadedClass;
        }

//        // 优先从parent（SystemClassLoader）里加载系统类，避免抛出ClassNotFoundException
//        if(name != null && (name.startsWith("sun.") || name.startsWith("java."))) {
//            return super.loadClass(name, resolve);
//        }

        try {
            Class aClass = findClass(name);
            if (resolve) {
                resolveClass(aClass);
            }
            return aClass;
        } catch (Exception e) {
            return super.loadClass(name, resolve);
        }
    }

    @Override
    public String toString() {
        return String.format("SandboxClassLoader[namespace=%s;path=%s;]", namespace, path);
    }
}