/*

 * 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

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

 * questions.

 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * ASM: a very small and fast Java bytecode manipulation framework

 * Copyright (c) 2000-2011 INRIA, France Telecom

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the copyright holders nor the names of its

 *    contributors may be used to endorse or promote products derived from

 *    this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

package jdk.internal.org.objectweb.asm.util;

import java.util.HashSet;

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

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

/**

 * @author Remi Forax

 */

public final class CheckModuleAdapter extends ModuleVisitor {

    private boolean end;

    private final boolean isOpen;

    private final HashSet<String> requireNames = new HashSet<String>();

    private final HashSet<String> exportNames = new HashSet<String>();

    private final HashSet<String> openNames = new HashSet<String>();

    private final HashSet<String> useNames = new HashSet<String>();

    private final HashSet<String> provideNames = new HashSet<String>();

    public CheckModuleAdapter(final ModuleVisitor mv, final boolean isOpen) {

        super(Opcodes.ASM6, mv);

        this.isOpen = isOpen;

    }

    @Override

    public void visitRequire(String module, int access, String version) {

        checkEnd();

        if (module == null) {

            throw new IllegalArgumentException("require cannot be null");

        }

        checkDeclared("requires", requireNames, module);

        CheckClassAdapter.checkAccess(access, Opcodes.ACC_STATIC_PHASE

                + Opcodes.ACC_TRANSITIVE + Opcodes.ACC_SYNTHETIC + Opcodes.ACC_MANDATED);

        super.visitRequire(module, access, version);

    }

    @Override

    public void visitExport(String packaze, int access, String... modules) {

        checkEnd();

        if (packaze == null) {

            throw new IllegalArgumentException("packaze cannot be null");

        }

        CheckMethodAdapter.checkInternalName(packaze, "package name");

        checkDeclared("exports", exportNames, packaze);

        CheckClassAdapter.checkAccess(access, Opcodes.ACC_SYNTHETIC

                + Opcodes.ACC_MANDATED);

        if (modules != null) {

            for (int i = 0; i < modules.length; i++) {

                if (modules[i] == null) {

                    throw new IllegalArgumentException("module at index " + i + " cannot be null");

                }

            }

        }

        super.visitExport(packaze, access, modules);

    }

    @Override

    public void visitOpen(String packaze, int access, String... modules) {

        checkEnd();

        if (isOpen) {

            throw new IllegalArgumentException("an open module can not use open directive");

        }

        if (packaze == null) {

            throw new IllegalArgumentException("packaze cannot be null");

        }

        CheckMethodAdapter.checkInternalName(packaze, "package name");

        checkDeclared("opens", openNames, packaze);

        CheckClassAdapter.checkAccess(access, Opcodes.ACC_SYNTHETIC

                + Opcodes.ACC_MANDATED);

        if (modules != null) {

            for (int i = 0; i < modules.length; i++) {

                if (modules[i] == null) {

                    throw new IllegalArgumentException("module at index " + i + " cannot be null");

                }

            }

        }

        super.visitOpen(packaze, access, modules);

    }

    @Override

    public void visitUse(String service) {

        checkEnd();

        CheckMethodAdapter.checkInternalName(service, "service");

        checkDeclared("uses", useNames, service);

        super.visitUse(service);

    }

    @Override

    public void visitProvide(String service, String... providers) {

        checkEnd();

        CheckMethodAdapter.checkInternalName(service, "service");

        checkDeclared("provides", provideNames, service);

        if (providers == null || providers.length == 0) {

            throw new IllegalArgumentException("providers cannot be null or empty");

        }

        for (int i = 0; i < providers.length; i++) {

            CheckMethodAdapter.checkInternalName(providers[i], "provider");

        }

        super.visitProvide(service, providers);

    }

    @Override

    public void visitEnd() {

        checkEnd();

        end = true;

        super.visitEnd();

    }

    private void checkEnd() {

        if (end) {

            throw new IllegalStateException(

                    "Cannot call a visit method after visitEnd has been called");

        }

    }

    private static void checkDeclared(String directive, HashSet<String> names, String name) {

        if (!names.add(name)) {

            throw new IllegalArgumentException(directive + " " + name + " already declared");

        }

    }

}