/*
 * 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
 
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.
/**
 * 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);
        }
    }
}