dagger.internal.codegen.SimpleAnnotationMirror.java Source code

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Here is the source code for dagger.internal.codegen.SimpleAnnotationMirror.java

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/*
 * Copyright (C) 2016 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;

import static com.google.common.base.Preconditions.checkArgument;
import static javax.lang.model.util.ElementFilter.methodsIn;

import com.google.auto.common.MoreTypes;
import com.google.common.base.Functions;
import com.google.common.base.Joiner;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import java.util.Map;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;

/** A representation of an annotation. */
final class SimpleAnnotationMirror implements AnnotationMirror {
    private final TypeElement annotationType;
    private final ImmutableMap<String, ? extends AnnotationValue> namedValues;
    private final ImmutableMap<ExecutableElement, ? extends AnnotationValue> elementValues;

    private SimpleAnnotationMirror(TypeElement annotationType, Map<String, ? extends AnnotationValue> namedValues) {
        checkArgument(annotationType.getKind().equals(ElementKind.ANNOTATION_TYPE),
                "annotationType must be an annotation: %s", annotationType);
        checkArgument(FluentIterable.from(methodsIn(annotationType.getEnclosedElements()))
                .transform(element -> element.getSimpleName().toString()).toSet().equals(namedValues.keySet()),
                "namedValues must have values for exactly the members in %s: %s", annotationType, namedValues);
        this.annotationType = annotationType;
        this.namedValues = ImmutableMap.copyOf(namedValues);
        this.elementValues = Maps.toMap(methodsIn(annotationType.getEnclosedElements()),
                Functions.compose(Functions.forMap(namedValues), element -> element.getSimpleName().toString()));
    }

    @Override
    public DeclaredType getAnnotationType() {
        return MoreTypes.asDeclared(annotationType.asType());
    }

    @Override
    public Map<ExecutableElement, ? extends AnnotationValue> getElementValues() {
        return elementValues;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder("@").append(annotationType.getQualifiedName());
        if (!namedValues.isEmpty()) {
            builder.append('(').append(Joiner.on(", ").withKeyValueSeparator(" = ").join(namedValues)).append(')');
        }
        return builder.toString();
    }

    /**
     * An object representing an annotation instance.
     *
     * @param annotationType must be an annotation type with no members
     */
    static AnnotationMirror of(TypeElement annotationType) {
        return of(annotationType, ImmutableMap.<String, AnnotationValue>of());
    }

    /**
     * An object representing an annotation instance.
     *
     * @param annotationType must be an annotation type
     * @param namedValues a value for every annotation member, including those with defaults, indexed
     *     by simple name
     */
    static AnnotationMirror of(TypeElement annotationType, Map<String, ? extends AnnotationValue> namedValues) {
        return new SimpleAnnotationMirror(annotationType, namedValues);
    }
}