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/*
* Copyright (C) 2019 The Dagger Authors.
*
* 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 dagger.hilt.processor.internal;
import static com.google.auto.common.AnnotationMirrors.getAnnotationValue;
import static com.google.auto.common.AnnotationMirrors.getAnnotationValuesWithDefaults;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.auto.common.MoreTypes;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Optional;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.AnnotationValueVisitor;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.SimpleAnnotationValueVisitor8;
/** A utility class for working with {@link AnnotationValue} instances. */
// TODO(bcorso): Update auto-common maven import so we can use it rather than this copy.
public final class AnnotationValues {
private AnnotationValues() {}
private static class DefaultVisitor<T> extends SimpleAnnotationValueVisitor8<T, Void> {
final Class<T> clazz;
DefaultVisitor(Class<T> clazz) {
this.clazz = checkNotNull(clazz);
}
@Override
public T defaultAction(Object o, Void unused) {
throw new IllegalArgumentException(
"Expected a " + clazz.getSimpleName() + ", got instead: " + o);
}
}
private static final class TypeMirrorVisitor extends DefaultVisitor<DeclaredType> {
static final TypeMirrorVisitor INSTANCE = new TypeMirrorVisitor();
TypeMirrorVisitor() {
super(DeclaredType.class);
}
@Override
public DeclaredType visitType(TypeMirror value, Void unused) {
return MoreTypes.asDeclared(value);
}
}
/**
* Returns the value as a class.
*
* @throws IllegalArgumentException if the value is not a class.
*/
public static DeclaredType getTypeMirror(AnnotationValue value) {
return TypeMirrorVisitor.INSTANCE.visit(value);
}
private static final class EnumVisitor extends DefaultVisitor<VariableElement> {
static final EnumVisitor INSTANCE = new EnumVisitor();
EnumVisitor() {
super(VariableElement.class);
}
@Override
public VariableElement visitEnumConstant(VariableElement value, Void unused) {
return value;
}
}
/**
* Returns the value as a VariableElement.
*
* @throws IllegalArgumentException if the value is not an enum.
*/
public static VariableElement getEnum(AnnotationValue value) {
return EnumVisitor.INSTANCE.visit(value);
}
/**
* Returns the value as a string.
*
* @throws IllegalArgumentException if the value is not a string.
*/
public static String getString(AnnotationValue value) {
return valueOfType(value, String.class);
}
private static <T> T valueOfType(AnnotationValue annotationValue, Class<T> type) {
Object value = annotationValue.getValue();
if (!type.isInstance(value)) {
throw new IllegalArgumentException(
"Expected " + type.getSimpleName() + ", got instead: " + value);
}
return type.cast(value);
}
/** Returns the int value of an annotation */
public static int getIntValue(AnnotationMirror annotation, String valueName) {
return (int) getAnnotationValue(annotation, valueName).getValue();
}
/** Returns an optional int value of an annotation if the value name is present */
public static Optional<Integer> getOptionalIntValue(
AnnotationMirror annotation, String valueName) {
return isValuePresent(annotation, valueName)
? Optional.of(getIntValue(annotation, valueName))
: Optional.empty();
}
/** Returns the String value of an annotation */
public static String getStringValue(AnnotationMirror annotation, String valueName) {
return (String) getAnnotationValue(annotation, valueName).getValue();
}
/** Returns an optional String value of an annotation if the value name is present */
public static Optional<String> getOptionalStringValue(
AnnotationMirror annotation, String valueName) {
return isValuePresent(annotation, valueName)
? Optional.of(getStringValue(annotation, valueName))
: Optional.empty();
}
/** Returns the int array value of an annotation */
public static int[] getIntArrayValue(AnnotationMirror annotation, String valueName) {
return getAnnotationValues(getAnnotationValue(annotation, valueName)).stream()
.mapToInt(it -> (int) it.getValue())
.toArray();
}
/** Returns the String array value of an annotation */
public static String[] getStringArrayValue(AnnotationMirror annotation, String valueName) {
return getAnnotationValues(getAnnotationValue(annotation, valueName)).stream()
.map(it -> (String) it.getValue())
.toArray(String[]::new);
}
private static boolean isValuePresent(AnnotationMirror annotation, String valueName) {
return getAnnotationValuesWithDefaults(annotation).keySet().stream()
.anyMatch(member -> member.getSimpleName().contentEquals(valueName));
}
/**
* Returns the list of values represented by an array annotation value.
*
* @throws IllegalArgumentException unless {@code annotationValue} represents an array
*/
public static ImmutableList<AnnotationValue> getAnnotationValues(
AnnotationValue annotationValue) {
return annotationValue.accept(AS_ANNOTATION_VALUES, null);
}
private static final AnnotationValueVisitor<ImmutableList<AnnotationValue>, String>
AS_ANNOTATION_VALUES =
new SimpleAnnotationValueVisitor8<ImmutableList<AnnotationValue>, String>() {
@Override
public ImmutableList<AnnotationValue> visitArray(
List<? extends AnnotationValue> vals, String elementName) {
return ImmutableList.copyOf(vals);
}
@Override
protected ImmutableList<AnnotationValue> defaultAction(Object o, String elementName) {
throw new IllegalArgumentException(elementName + " is not an array: " + o);
}
};
}
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