/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package selectionresolution;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

public class ByteCodeClassLoader extends ClassLoader {

    ArrayList<ClassConstruct> classes = new ArrayList<>();

    HashMap<String, Class> loadedClasses = new HashMap<>();

    public void addClasses(ClassConstruct... classes) {

        this.classes.addAll(Arrays.asList(classes));

    }

    public void loadAll() throws ClassNotFoundException {

        for (ClassConstruct clazz : classes) {

            findClass(clazz.getDottedName());

        }

    }

    @Override

    public Class findClass(String name) throws ClassNotFoundException {

        Class cls = loadedClasses.get(name);

        if (cls != null) {

            return cls;

        }

        for (ClassConstruct clazz : classes) {

            if (clazz.getDottedName().equals(name)) {

                return load(clazz);

            }

        }

        throw new ClassNotFoundException(name);

    }

    @Override

    public Class loadClass(String name) throws ClassNotFoundException {

        try {

            return findClass(name);

        } catch (ClassNotFoundException e) {

            return super.loadClass(name);

        }

    }

    private Class load(ClassConstruct clazz) {

        byte[] bytecode = clazz.generateBytes();

        Class loadedClass = defineClass(clazz.getDottedName(), bytecode, 0, bytecode.length);

        loadedClasses.put(clazz.getDottedName(), loadedClass);

        return loadedClass;

    }

}