95 lines
3.4 KiB
Java
95 lines
3.4 KiB
Java
/*
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* Copyright (C) 2022 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.internal.reflect;
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import static com.google.common.truth.Truth.assertThat;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.nio.file.attribute.GroupPrincipal;
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import java.nio.file.attribute.UserPrincipal;
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import java.util.Objects;
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import org.junit.Test;
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public class Java17ReflectionHelperTest {
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@Test
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public void testJava17Record() throws ClassNotFoundException {
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Class<?> unixDomainPrincipalClass = Class.forName("jdk.net.UnixDomainPrincipal");
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// UnixDomainPrincipal is a record
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assertThat(ReflectionHelper.isRecord(unixDomainPrincipalClass)).isTrue();
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// with 2 components
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assertThat(ReflectionHelper.getRecordComponentNames(unixDomainPrincipalClass))
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.isEqualTo(new String[] {"user", "group"});
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// Check canonical constructor
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Constructor<?> constructor =
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ReflectionHelper.getCanonicalRecordConstructor(unixDomainPrincipalClass);
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assertThat(constructor).isNotNull();
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assertThat(constructor.getParameterTypes())
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.isEqualTo(new Class<?>[] {UserPrincipal.class, GroupPrincipal.class});
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}
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@Test
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public void testJava17RecordAccessors() throws ReflectiveOperationException {
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// Create an instance of UnixDomainPrincipal, using our custom implementation of UserPrincipal,
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// and GroupPrincipal. Then attempt to access each component of the record using our accessor
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// methods.
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Class<?> unixDomainPrincipalClass = Class.forName("jdk.net.UnixDomainPrincipal");
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Object unixDomainPrincipal =
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ReflectionHelper.getCanonicalRecordConstructor(unixDomainPrincipalClass)
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.newInstance(new PrincipalImpl("user"), new PrincipalImpl("group"));
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String[] componentNames = ReflectionHelper.getRecordComponentNames(unixDomainPrincipalClass);
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assertThat(componentNames).isNotEmpty();
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for (String componentName : componentNames) {
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Field componentField = unixDomainPrincipalClass.getDeclaredField(componentName);
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Method accessor = ReflectionHelper.getAccessor(unixDomainPrincipalClass, componentField);
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Object principal = accessor.invoke(unixDomainPrincipal);
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assertThat(principal).isEqualTo(new PrincipalImpl(componentName));
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}
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}
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/** Implementation of {@link UserPrincipal} and {@link GroupPrincipal} just for record tests. */
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public static class PrincipalImpl implements UserPrincipal, GroupPrincipal {
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private final String name;
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public PrincipalImpl(String name) {
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this.name = name;
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}
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@Override
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public String getName() {
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return name;
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}
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@Override
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public boolean equals(Object o) {
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if (o instanceof PrincipalImpl) {
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return Objects.equals(name, ((PrincipalImpl) o).name);
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}
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return false;
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}
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@Override
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public int hashCode() {
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return Objects.hash(name);
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}
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}
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}
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