/*

 * Copyright (c) 2015, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

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package jdk.tools.jlink.internal.plugins;

import java.util.function.Predicate;

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

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

import jdk.tools.jlink.plugin.ResourcePool;

import jdk.tools.jlink.plugin.ResourcePoolBuilder;

import jdk.tools.jlink.plugin.ResourcePoolEntry;

import jdk.tools.jlink.plugin.Plugin;

/**

 *

 * Strip debug attributes plugin

 */

public final class StripDebugPlugin implements Plugin {

    public static final String NAME = "strip-debug";

    private final Predicate<String> predicate;

    public StripDebugPlugin() {

        this((path) -> false);

    }

    StripDebugPlugin(Predicate<String> predicate) {

        this.predicate = predicate;

    }

    @Override

    public String getName() {

        return NAME;

    }

    @Override

    public String getDescription() {

        return PluginsResourceBundle.getDescription(NAME);

    }

    @Override

    public ResourcePool transform(ResourcePool in, ResourcePoolBuilder out) {

        //remove *.diz files as well as debug attributes.

        in.transformAndCopy((resource) -> {

            ResourcePoolEntry res = resource;

            if (resource.type().equals(ResourcePoolEntry.Type.CLASS_OR_RESOURCE)) {

                String path = resource.path();

                if (path.endsWith(".class")) {

                    if (path.endsWith("module-info.class")) {

                        // XXX. Do we have debug info? Is Asm ready for module-info?

                    } else {

                        ClassReader reader = new ClassReader(resource.contentBytes());

                        ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);

                        reader.accept(writer, ClassReader.SKIP_DEBUG);

                        byte[] content = writer.toByteArray();

                        res = resource.copyWithContent(content);

                    }

                }

            } else if (predicate.test(res.path())) {

                res = null;

            }

            return res;

        }, out);

        return out.build();

    }

}