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 com.google.common.annotations.GwtIncompatible; 19 import org.checkerframework.checker.nullness.qual.Nullable; 20 21 /** 22 * Propositions for {@link Class} subjects. 23 * 24 * @author Kurt Alfred Kluever 25 */ 26 @GwtIncompatible("reflection") 27 public final class ClassSubject extends Subject { 28 private final Class<?> actual; 29 ClassSubject(FailureMetadata metadata, @Nullable Class<?> o)30 ClassSubject(FailureMetadata metadata, @Nullable Class<?> o) { 31 super(metadata, o); 32 this.actual = o; 33 } 34 35 /** 36 * Fails if this class or interface is not the same as or a subclass or subinterface of, the given 37 * class or interface. 38 */ isAssignableTo(Class<?> clazz)39 public void isAssignableTo(Class<?> clazz) { 40 if (!clazz.isAssignableFrom(actual)) { 41 failWithActual("expected to be assignable to", clazz.getName()); 42 } 43 } 44 } 45