/*

 * Copyright (c) 2011, 2012, 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

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

 * questions.

 */

package com.sun.tools.classfile;

import java.io.IOException;

/**

 * See JVMS 4.7.21

 * http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.7.21

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class BootstrapMethods_attribute extends Attribute {

    public final BootstrapMethodSpecifier[] bootstrap_method_specifiers;

    BootstrapMethods_attribute(ClassReader cr, int name_index, int length)

            throws IOException, AttributeException {

        super(name_index, length);

        int bootstrap_method_count = cr.readUnsignedShort();

        bootstrap_method_specifiers = new BootstrapMethodSpecifier[bootstrap_method_count];

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

            bootstrap_method_specifiers[i] = new BootstrapMethodSpecifier(cr);

    }

    public  BootstrapMethods_attribute(int name_index, BootstrapMethodSpecifier[] bootstrap_method_specifiers) {

        super(name_index, length(bootstrap_method_specifiers));

        this.bootstrap_method_specifiers = bootstrap_method_specifiers;

    }

    public static int length(BootstrapMethodSpecifier[] bootstrap_method_specifiers) {

        int n = 2;

        for (BootstrapMethodSpecifier b : bootstrap_method_specifiers)

            n += b.length();

        return n;

    }

    @Override

    public <R, P> R accept(Visitor<R, P> visitor, P p) {

        return visitor.visitBootstrapMethods(this, p);

    }

    public static class BootstrapMethodSpecifier {

        public int bootstrap_method_ref;

        public int[] bootstrap_arguments;

        public BootstrapMethodSpecifier(int bootstrap_method_ref, int[] bootstrap_arguments) {

            this.bootstrap_method_ref = bootstrap_method_ref;

            this.bootstrap_arguments = bootstrap_arguments;

        }

        BootstrapMethodSpecifier(ClassReader cr) throws IOException {

            bootstrap_method_ref = cr.readUnsignedShort();

            int method_count = cr.readUnsignedShort();

            bootstrap_arguments = new int[method_count];

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

                bootstrap_arguments[i] = cr.readUnsignedShort();

            }

        }

        int length() {

            // u2 (method_ref) + u2 (argc) + u2 * argc

            return 2 + 2 + (bootstrap_arguments.length * 2);

        }

    }

}