test/jdk/java/lang/LazyConstant/LazyConstantTestUtil.java - master - githubmirror/panama-vector

test/jdk/java/lang/LazyConstant/LazyConstantTestUtil.java
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8376811: Implement JEP 531: Lazy Constants (Third Preview)
08 май 2026, 11:03
08 май 2026, 11:03a6bd64b
/*
 * Copyright (c) 2025, 2026, 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.
 *
 * 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.
 */

import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.*;

final class LazyConstantTestUtil {

    private LazyConstantTestUtil() { }

    public static final String UNINITIALIZED_TAG = ".uninitialized";

    public static final class CountingSupplier<T>
            extends AbstractCounting<Supplier<T>>
            implements Supplier<T> {

        public CountingSupplier(Supplier<T> delegate) {
            super(delegate);
        }

        @Override
        public T get() {
            incrementCounter();
            return delegate.get();
        }

    }

    public static final class CountingIntFunction<R>
            extends AbstractCounting<IntFunction<R>>
            implements IntFunction<R> {

        public CountingIntFunction(IntFunction<R> delegate) {
            super(delegate);
        }

        @Override
        public R apply(int value) {
            incrementCounter();
            return delegate.apply(value);
        }

    }

    public static final class CountingFunction<T, R>
            extends AbstractCounting<Function<T, R>>
            implements Function<T, R> {

        public CountingFunction(Function<T, R> delegate) {
            super(delegate);
        }

        @Override
        public R apply(T t) {
            incrementCounter();
            return delegate.apply(t);
        }

    }

    public static final class CountingPredicate<T>
            extends AbstractCounting<Predicate<T>>
            implements Predicate<T> {

        public CountingPredicate(Predicate<T> delegate) {
            super(delegate);
        }

        @Override
        public boolean test(T t) {
            incrementCounter();
            return delegate.test(t);
        }

    }

    public static final class CountingBiFunction<T, U, R>
            extends AbstractCounting<BiFunction<T, U, R>>
            implements BiFunction<T, U, R> {

        public CountingBiFunction(BiFunction<T, U, R> delegate) {
            super(delegate);
        }

        @Override
        public R apply(T t, U u) {
            incrementCounter();
            return delegate.apply(t, u);
        }
    }

    abstract static class AbstractCounting<D> {

        private final AtomicInteger cnt = new AtomicInteger();
        protected final D delegate;

        protected AbstractCounting(D delegate) {
            this.delegate = delegate;
        }

        protected final void incrementCounter() {
            cnt.incrementAndGet();
        }

        public final int cnt() {
            return cnt.get();
        }

        @Override
        public final String toString() {
            return cnt.toString();
        }
    }

    static Object functionHolder(Object o) {
        try {
            final Field field = field(o.getClass(), "functionHolder");
            field.setAccessible(true);
            return field.get(o);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    static Object functionHolderFunction(Object o) {
        try {
            final Field field = field(o.getClass(), "function");
            field.setAccessible(true);
            return field.get(o);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    static int functionHolderCounter(Object o) {
        try {
            final Field field = field(o.getClass(), "counter");
            field.setAccessible(true);
            return (int)field.get(o);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    static Object computingFunction(LazyConstant<?> o) {
        try {
            final Field field = field(o.getClass(), "computingFunctionOrExceptionType");
            field.setAccessible(true);
            return field.get(o);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    static Field field(Class<?> clazz, String name) {
        if (clazz.equals(Object.class)) {
            throw new RuntimeException("No " + name);
        }
        try {
            return clazz.getDeclaredField(name);
        } catch (NoSuchFieldException e) {
            return field(clazz.getSuperclass(), name);
        }
    }

    static String expectedMessage(Class<? extends Throwable> throwableClass, Object input) {
        return "Unable to access the lazy collection because " + throwableClass.getName() + " was thrown at initial computation for input '" + input + "'";
    }

    @SuppressWarnings("unchecked")
    static <E extends Throwable> void sneakyThrow(Throwable e) throws E {
        throw (E) e;
    }

    record Thrower(String message, Function<String, ? extends Throwable> factory) {
        public Supplier<? extends Throwable> supplier() {
            return () -> factory.apply(Thrower.this.message);
        }
    }

    static List<Thrower> throwers() {
        return List.of(
                new Thrower("Initial checked exception", IOException::new),
                new Thrower("Initial runtime exception", UnsupportedOperationException::new),
                new Thrower("Initial Error", InternalError::new)
        );
    }

}