/*

 * Copyright (c) 2017, 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 jdk.tools.jaotc.collect;

import jdk.tools.jaotc.LoadedClass;

import java.util.ArrayList;

import java.util.List;

public class ClassSearch {

    private List<SourceProvider> providers = new ArrayList<>();

    public void addProvider(SourceProvider provider) {

        providers.add(provider);

    }

    public List<LoadedClass> search(List<SearchFor> search, SearchPath searchPath) {

        List<LoadedClass> loaded = new ArrayList<>();

        List<ClassSource> sources = new ArrayList<>();

        for (SearchFor entry : search) {

            sources.add(findSource(entry, searchPath));

        }

        for (ClassSource source : sources) {

            source.eachClass((name, loader) -> loaded.add(loadClass(name, loader)));

        }

        return loaded;

    }

    private LoadedClass loadClass(String name, ClassLoader loader) {

        try {

            Class<?> clzz = loader.loadClass(name);

            return new LoadedClass(name, clzz);

        } catch (ClassNotFoundException e) {

            throw new InternalError("Failed to load with: " + loader, e);

        }

    }

    private ClassSource findSource(SearchFor searchFor, SearchPath searchPath) {

        ClassSource found = null;

        for (SourceProvider provider : providers) {

            if (!searchFor.isUnknown() && !provider.supports(searchFor.getType())) {

                continue;

            }

            ClassSource source = provider.findSource(searchFor.getName(), searchPath);

            if (source != null) {

                if (found != null) {

                    throw new InternalError("Multiple possible sources: " + source + " and: " + found);

                }

                found = source;

            }

        }

        if (found == null) {

            throw new InternalError("Failed to find: " + searchFor.toString());

        }

        return found;

    }

    public static List<SearchFor> makeList(String type, String argument) {

        List<SearchFor> list = new ArrayList<>();

        String[] elements = argument.split(":");

        for (String element : elements) {

            list.add(new SearchFor(element, type));

        }

        return list;

    }

}