com.google.auto.factory.processor.Mirrors.java Source code

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Here is the source code for com.google.auto.factory.processor.Mirrors.java

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/*
 * Copyright (C) 2013 Google, Inc.
 *
 * 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.factory.processor;

import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.Map.Entry;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Name;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.util.SimpleElementVisitor6;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;

final class Mirrors {
    private Mirrors() {
    }

    static Name getQualifiedName(DeclaredType type) {
        return type.asElement().accept(new SimpleElementVisitor6<Name, Void>() {
            @Override
            protected Name defaultAction(Element e, Void p) {
                throw new AssertionError("DeclaredTypes should be TypeElements");
            }

            @Override
            public Name visitType(TypeElement e, Void p) {
                return e.getQualifiedName();
            }
        }, null);
    }

    /**
     * Returns an annotation value map  with {@link String} keys instead of {@link ExecutableElement}
     * instances.
     */
    static ImmutableMap<String, AnnotationValue> simplifyAnnotationValueMap(
            Map<? extends ExecutableElement, ? extends AnnotationValue> annotationValueMap) {
        ImmutableMap.Builder<String, AnnotationValue> builder = ImmutableMap.builder();
        for (Entry<? extends ExecutableElement, ? extends AnnotationValue> entry : annotationValueMap.entrySet()) {
            builder.put(entry.getKey().getSimpleName().toString(), entry.getValue());
        }
        return builder.build();
    }

    /**
     * Get the {@link AnnotationMirror} for the type {@code annotationType} present on the given
     * {@link Element} if it exists.
     */
    static Optional<AnnotationMirror> getAnnotationMirror(Element element,
            Class<? extends Annotation> annotationType) {
        String annotationName = annotationType.getName();
        for (AnnotationMirror annotationMirror : element.getAnnotationMirrors()) {
            if (getQualifiedName(annotationMirror.getAnnotationType()).contentEquals(annotationName)) {
                return Optional.of(annotationMirror);
            }
        }
        return Optional.absent();
    }
}