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An unofficial backport of the JDK Classfile API to Java 17
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/*
 * Copyright (c) 2022, 2024, 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 io.github.dmlloyd.classfile;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * A {@link ClassFileElement} that has complex structure defined in terms of
 * other classfile elements, such as a method, field, method body, or entire
 * class.  When encountering a {@linkplain CompoundElement}, clients have the
 * option to treat the element as a single entity (e.g., an entire method)
 * or to traverse the contents of that element with the methods in this class
 * (e.g., {@link #forEach(Consumer)}, etc.)
 * @param  the element type
 *
 * @sealedGraph
 * @since 24
 */
public sealed interface CompoundElement
        extends ClassFileElement, Iterable
        permits ClassModel, CodeModel, FieldModel, MethodModel, io.github.dmlloyd.classfile.impl.AbstractUnboundModel {
    /**
     * Invoke the provided handler with each element contained in this
     * compound element
     * @param consumer the handler
     */
    @Override
    void forEach(Consumer consumer);

    /**
     * {@return an {@link Iterator} describing all the elements contained in this
     * compound element}
     */
    @Override
    default Iterator iterator() {
        return elementList().iterator();
    }

    /**
     * {@return a {@link Stream} containing all the elements contained in this
     * compound element}
     */
    default Stream elementStream() {
        return StreamSupport.stream(Spliterators.spliteratorUnknownSize(
                                            iterator(),
                                            Spliterator.IMMUTABLE | Spliterator.NONNULL | Spliterator.ORDERED),
                                    false);
    }

    /**
     * {@return an {@link List} containing all the elements contained in this
     * compound element}
     */
    default List elementList() {
        List list = new ArrayList<>();
        forEach(new Consumer<>() {
            @Override
            public void accept(E e) {
                list.add(e);
            }
        });
        return Collections.unmodifiableList(list);
    }

}