/**
 * Copyright 2013, Landz and its contributors. All rights reserved.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package z.znr.invoke.linux.x64;

import jdk.internal.org.objectweb.asm.ClassReader;

import java.io.PrintWriter;
import java.io.Writer;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

final class AsmClassLoader extends ClassLoader {
    private final ConcurrentMap<String, Class> definedClasses = new ConcurrentHashMap<String, Class>();

    AsmClassLoader(ClassLoader parent) {
        super(parent);
    }

    public Class defineClass(String name, byte[] b) {
        return defineClass(name, b, null);
    }

    public Class defineClass(String name, byte[] b, Writer debug) {
        if (debug != null) {
            new ClassReader(b).accept(AsmUtil.newTraceClassVisitor(new PrintWriter(debug)), 0);
        }
        Class klass = defineClass(name, b, 0, b.length);
        definedClasses.putIfAbsent(name, klass);
        resolveClass(klass);
        return klass;
    }

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        Class klass = definedClasses.get(name);
        if (klass != null) {
            return klass;
        }
        return super.findClass(name);
    }
}