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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.util;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;

/**
 *  ClassLoadingObjectInputStream
 *
 *  For re-inflating serialized objects, this class uses the thread context classloader
 *  rather than the jvm's default classloader selection.
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class ClassLoadingObjectInputStream extends ObjectInputStream {

    // @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
    @Deprecated(since = "2021-05-27")
    protected static class ClassLoaderThreadLocal extends ThreadLocal {

        protected static final ClassLoader UNSET = new ClassLoader() {
        };

        @Override
        protected ClassLoader initialValue() {
            return UNSET;
        }
    }

    private ThreadLocal _classloader = new ClassLoaderThreadLocal();

    public ClassLoadingObjectInputStream(java.io.InputStream in) throws IOException {
        super(in);
    }

    public ClassLoadingObjectInputStream() throws IOException {
        super();
    }

    public Object readObject(ClassLoader loader) throws IOException, ClassNotFoundException {
        try {
            _classloader.set(loader);
            return readObject();
        } finally {
            _classloader.set(ClassLoaderThreadLocal.UNSET);
        }
    }

    @Override
    public Class resolveClass(java.io.ObjectStreamClass cl) throws IOException, ClassNotFoundException {
        try {
            ClassLoader loader = _classloader.get();
            if (ClassLoaderThreadLocal.UNSET == loader)
                loader = Thread.currentThread().getContextClassLoader();
            return Class.forName(cl.getName(), false, loader);
        } catch (ClassNotFoundException e) {
            return super.resolveClass(cl);
        }
    }

    @Override
    protected Class resolveProxyClass(String[] interfaces) throws IOException, ClassNotFoundException {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        ClassLoader nonPublicLoader = null;
        boolean hasNonPublicInterface = false;
        // define proxy in class loader of non-public interface(s), if any
        Class[] classObjs = new Class[interfaces.length];
        for (int i = 0; i < interfaces.length; i++) {
            Class cl = Class.forName(interfaces[i], false, loader);
            if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
                if (hasNonPublicInterface) {
                    if (nonPublicLoader != cl.getClassLoader()) {
                        throw new IllegalAccessError("conflicting non-public interface class loaders");
                    }
                } else {
                    nonPublicLoader = cl.getClassLoader();
                    hasNonPublicInterface = true;
                }
            }
            classObjs[i] = cl;
        }
        try {
            return Proxy.getProxyClass(hasNonPublicInterface ? nonPublicLoader : loader, classObjs);
        } catch (IllegalArgumentException e) {
            throw new ClassNotFoundException(null, e);
        }
    }
}