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/*
* Copyright 2017 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.auto.common;
import static com.google.common.collect.Iterables.getOnlyElement;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import com.google.common.collect.ImmutableMap;
import com.google.testing.compile.CompilationRule;
import java.util.HashMap;
import java.util.Map;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.AnnotationValueVisitor;
import javax.lang.model.element.TypeElement;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/** Tests for {@link SimpleAnnotationMirror}. */
@RunWith(JUnit4.class)
public class SimpleAnnotationMirrorTest {
@Rule public final CompilationRule compilation = new CompilationRule();
@interface EmptyAnnotation {}
@interface AnnotationWithDefault {
int value() default 3;
}
@interface MultipleValues {
int value1();
int value2();
}
@Test
public void emptyAnnotation() {
TypeElement emptyAnnotation = getTypeElement(EmptyAnnotation.class);
AnnotationMirror simpleAnnotation = SimpleAnnotationMirror.of(emptyAnnotation);
assertThat(simpleAnnotation.getAnnotationType()).isEqualTo(emptyAnnotation.asType());
assertThat(simpleAnnotation.getElementValues()).isEmpty();
}
@Test
public void multipleValues() {
TypeElement multipleValues = getTypeElement(MultipleValues.class);
Map<String, AnnotationValue> values = new HashMap<>();
values.put("value1", intValue(1));
values.put("value2", intValue(2));
assertThat(SimpleAnnotationMirror.of(multipleValues, values).getElementValues()).hasSize(2);
}
@Test
public void extraValues() {
TypeElement multipleValues = getTypeElement(MultipleValues.class);
Map<String, AnnotationValue> values = new HashMap<>();
values.put("value1", intValue(1));
values.put("value2", intValue(2));
values.put("value3", intValue(3));
expectThrows(() -> SimpleAnnotationMirror.of(multipleValues, values));
}
@Test
public void defaultValue() {
TypeElement withDefaults = getTypeElement(AnnotationWithDefault.class);
AnnotationMirror annotation = SimpleAnnotationMirror.of(withDefaults);
assertThat(annotation.getElementValues()).hasSize(1);
assertThat(getOnlyElement(annotation.getElementValues().values()).getValue()).isEqualTo(3);
}
@Test
public void overriddenDefaultValue() {
TypeElement withDefaults = getTypeElement(AnnotationWithDefault.class);
AnnotationMirror annotation =
SimpleAnnotationMirror.of(withDefaults, ImmutableMap.of("value", intValue(4)));
assertThat(annotation.getElementValues()).hasSize(1);
assertThat(getOnlyElement(annotation.getElementValues().values()).getValue()).isEqualTo(4);
}
@Test
public void missingValues() {
TypeElement multipleValues = getTypeElement(MultipleValues.class);
expectThrows(() -> SimpleAnnotationMirror.of(multipleValues));
}
@Test
public void notAnAnnotation() {
TypeElement stringElement = getTypeElement(String.class);
expectThrows(() -> SimpleAnnotationMirror.of(stringElement));
}
private TypeElement getTypeElement(Class<?> clazz) {
return compilation.getElements().getTypeElement(clazz.getCanonicalName());
}
private static void expectThrows(Runnable throwingRunnable) {
try {
throwingRunnable.run();
fail("Expected an IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
private static AnnotationValue intValue(int value) {
return new AnnotationValue() {
@Override
public Object getValue() {
return value;
}
@Override
public <R, P> R accept(AnnotationValueVisitor<R, P> annotationValueVisitor, P p) {
return annotationValueVisitor.visitInt(value, p);
}
};
}
}
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