russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
90 lines
3.2 KiB
Java
90 lines
3.2 KiB
Java
/*
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* Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @run junit/othervm -ea -esa test.java.lang.invoke.ArrayLengthTest
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*/
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package test.java.lang.invoke;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.MethodSource;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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public class ArrayLengthTest {
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static Object[] arrayClasses() {
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return new Object[] {
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int[].class,
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long[].class,
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float[].class,
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double[].class,
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boolean[].class,
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byte[].class,
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short[].class,
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char[].class,
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Object[].class,
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StringBuffer[].class
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};
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}
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@ParameterizedTest
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@MethodSource("arrayClasses")
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public void testArrayLength(Class<?> arrayClass) throws Throwable {
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MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
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assertEquals(int.class, arrayLength.type().returnType());
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assertEquals(arrayClass, arrayLength.type().parameterType(0));
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Object array = MethodHandles.arrayConstructor(arrayClass).invoke(10);
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assertEquals(10, arrayLength.invoke(array));
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}
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@ParameterizedTest
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@MethodSource("arrayClasses")
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public void testArrayLengthInvokeNPE(Class<?> arrayClass) throws Throwable {
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MethodHandle arrayLength = MethodHandles.arrayLength(arrayClass);
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assertThrows(NullPointerException.class, () -> arrayLength.invoke(null));
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}
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@Test
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public void testArrayLengthNoArray() {
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assertThrows(IllegalArgumentException.class, () -> MethodHandles.arrayLength(String.class));
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}
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@Test
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public void testArrayLengthNPE() {
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assertThrows(NullPointerException.class, () -> MethodHandles.arrayLength(null));
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}
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@Test
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public void testNullReference() throws Throwable {
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MethodHandle arrayLength = MethodHandles.arrayLength(String[].class);
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assertThrows(NullPointerException.class, () -> {
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int len = (int)arrayLength.invokeExact((String[])null);
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});
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}
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}
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