1 /* 2 * Copyright (c) 2011 Google, Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.google.common.truth; 17 18 import static com.google.common.base.Preconditions.checkNotNull; 19 20 import com.google.common.annotations.GwtIncompatible; 21 import org.checkerframework.checker.nullness.qual.Nullable; 22 23 /** 24 * Propositions for {@link Class} subjects. 25 * 26 * @author Kurt Alfred Kluever 27 */ 28 @GwtIncompatible("reflection") 29 @J2ktIncompatible 30 public final class ClassSubject extends Subject { 31 private final @Nullable Class<?> actual; 32 ClassSubject(FailureMetadata metadata, @Nullable Class<?> o)33 ClassSubject(FailureMetadata metadata, @Nullable Class<?> o) { 34 super(metadata, o); 35 this.actual = o; 36 } 37 38 /** 39 * Fails if this class or interface is not the same as or a subclass or subinterface of, the given 40 * class or interface. 41 */ isAssignableTo(Class<?> clazz)42 public void isAssignableTo(Class<?> clazz) { 43 if (!clazz.isAssignableFrom(checkNotNull(actual))) { 44 failWithActual("expected to be assignable to", clazz.getName()); 45 } 46 } 47 } 48