| /* |
| * Copyright (C) 2013 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.internal.codegen.base; |
| |
| import static com.google.auto.common.AnnotationMirrors.getAnnotationValue; |
| import static com.google.auto.common.AnnotationMirrors.getAnnotationValuesWithDefaults; |
| |
| 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.type.TypeMirror; |
| import javax.lang.model.util.SimpleAnnotationValueVisitor8; |
| |
| /** Utility methods for working with {@link AnnotationValue} instances. */ |
| public final class MoreAnnotationValues { |
| /** |
| * Returns the list of values represented by an array annotation value. |
| * |
| * @throws IllegalArgumentException unless {@code annotationValue} represents an array |
| */ |
| public static ImmutableList<AnnotationValue> asAnnotationValues(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); |
| } |
| }; |
| |
| /** |
| * Returns the type represented by an annotation value. |
| * |
| * @throws IllegalArgumentException unless {@code annotationValue} represents a single type |
| */ |
| public static TypeMirror asType(AnnotationValue annotationValue) { |
| return AS_TYPE.visit(annotationValue); |
| } |
| |
| private static final AnnotationValueVisitor<TypeMirror, Void> AS_TYPE = |
| new SimpleAnnotationValueVisitor8<TypeMirror, Void>() { |
| @Override |
| public TypeMirror visitType(TypeMirror t, Void p) { |
| return t; |
| } |
| |
| @Override |
| protected TypeMirror defaultAction(Object o, Void p) { |
| throw new TypeNotPresentException(o.toString(), null); |
| } |
| }; |
| |
| /** 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 asAnnotationValues(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 asAnnotationValues(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)); |
| } |
| |
| private MoreAnnotationValues() {} |
| } |