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A fast dependency injector for Android and 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.base;

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. */
public final class SimpleAnnotationMirror implements AnnotationMirror {
  private final TypeElement annotationType;
  private final ImmutableMap namedValues;
  private final ImmutableMap elementValues;

  private SimpleAnnotationMirror(
      TypeElement annotationType, Map 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 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
   */
  public static AnnotationMirror of(TypeElement annotationType) {
    return of(annotationType, ImmutableMap.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
   */
  private static AnnotationMirror of(
      TypeElement annotationType, Map namedValues) {
    return new SimpleAnnotationMirror(annotationType, namedValues);
  }
}