108 lines
3.9 KiB
Java
108 lines
3.9 KiB
Java
/*
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* Copyright (C) 2016 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.internal.codegen.base;
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import static com.google.common.base.Preconditions.checkArgument;
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import static javax.lang.model.util.ElementFilter.methodsIn;
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import com.google.auto.common.MoreTypes;
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import com.google.common.base.Functions;
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import com.google.common.base.Joiner;
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import com.google.common.collect.FluentIterable;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.collect.Maps;
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import java.util.Map;
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import javax.lang.model.element.AnnotationMirror;
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import javax.lang.model.element.AnnotationValue;
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import javax.lang.model.element.ElementKind;
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import javax.lang.model.element.ExecutableElement;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.type.DeclaredType;
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/** A representation of an annotation. */
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public final class SimpleAnnotationMirror implements AnnotationMirror {
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private final TypeElement annotationType;
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private final ImmutableMap<String, ? extends AnnotationValue> namedValues;
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private final ImmutableMap<ExecutableElement, ? extends AnnotationValue> elementValues;
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private SimpleAnnotationMirror(
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TypeElement annotationType, Map<String, ? extends AnnotationValue> namedValues) {
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checkArgument(
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annotationType.getKind().equals(ElementKind.ANNOTATION_TYPE),
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"annotationType must be an annotation: %s",
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annotationType);
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checkArgument(
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FluentIterable.from(methodsIn(annotationType.getEnclosedElements()))
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.transform(element -> element.getSimpleName().toString())
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.toSet()
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.equals(namedValues.keySet()),
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"namedValues must have values for exactly the members in %s: %s",
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annotationType,
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namedValues);
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this.annotationType = annotationType;
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this.namedValues = ImmutableMap.copyOf(namedValues);
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this.elementValues =
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Maps.toMap(
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methodsIn(annotationType.getEnclosedElements()),
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Functions.compose(
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Functions.forMap(namedValues), element -> element.getSimpleName().toString()));
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}
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@Override
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public DeclaredType getAnnotationType() {
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return MoreTypes.asDeclared(annotationType.asType());
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}
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@Override
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public Map<ExecutableElement, ? extends AnnotationValue> getElementValues() {
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return elementValues;
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}
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@Override
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public String toString() {
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StringBuilder builder = new StringBuilder("@").append(annotationType.getQualifiedName());
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if (!namedValues.isEmpty()) {
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builder
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.append('(')
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.append(Joiner.on(", ").withKeyValueSeparator(" = ").join(namedValues))
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.append(')');
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}
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return builder.toString();
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}
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/**
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* An object representing an annotation instance.
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*
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* @param annotationType must be an annotation type with no members
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*/
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public static AnnotationMirror of(TypeElement annotationType) {
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return of(annotationType, ImmutableMap.<String, AnnotationValue>of());
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}
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/**
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* An object representing an annotation instance.
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*
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* @param annotationType must be an annotation type
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* @param namedValues a value for every annotation member, including those with defaults, indexed
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* by simple name
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*/
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private static AnnotationMirror of(
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TypeElement annotationType, Map<String, ? extends AnnotationValue> namedValues) {
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return new SimpleAnnotationMirror(annotationType, namedValues);
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}
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}
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