Android Open Source - android_widget_adapters Adapter Annotations

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[Apache License](http://www.apache.org/licenses/): Version 2.0, January 2004 =============== ## TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION ## ### 1. Definitions. ### "License" sha...

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Java Source Code

/*
 * =================================================================================================
 *                    Copyright (C) 2014 Martin Albedinsky [Wolf-ITechnologies]
 * =================================================================================================
 *         Licensed under the Apache License, Version 2.0 or later (further "License" only).
 * -------------------------------------------------------------------------------------------------
 * You may use this file only in compliance with the License. More details and copy of this License
 * you may obtain at// w ww  .ja va  2 s  . com
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * You can redistribute, modify or publish any part of the code written within this file but as it
 * is described in the License, the software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES or CONDITIONS OF ANY KIND.
 *
 * See the License for the specific language governing permissions and limitations under the License.
 * =================================================================================================
 */
package com.wit.android.ui.widget.adapter;

import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import java.lang.annotation.Annotation;

/**
 * <h3>Class Overview</h3>
 * Helper class to obtain class annotations.
 *
 * @author Martin Albedinsky
 */
final class AdapterAnnotations {

  /**
   * Same as {@link #obtainAnnotationFrom(Class, Class, Class)} with no <var>maxSuperClass</var>
   * specified.
   */
  @Nullable
  static <A extends Annotation> A obtainAnnotationFrom(@NonNull Class<?> fromClass, @NonNull Class<A> classOfAnnotation) {
    return obtainAnnotationFrom(fromClass, classOfAnnotation, null);
  }

  /**
   * Obtains the specified type of an annotation from the given <var>fromClass</var> if it is presented.
   *
   * @param fromClass         A class from which should be the requested annotation obtained.
   * @param classOfAnnotation A class of the requested annotation.
   * @param maxSuperClass     If {@code not null}, this method will be called (recursively)
   *                          for all super classes of the given annotated class (max to the specified
   *                          <var>maxSuperClass</var>) until the requested annotation is presented
   *                          and obtained, otherwise annotation will be obtained only from the given
   *                          annotated class.
   * @param <A>               The type of the requested annotation.
   * @return Obtained annotation or {@code null} if the requested annotation is not presented
   * for the given class or its supers if requested.
   * @see #obtainAnnotationFrom(Class, Class)
   */
  @Nullable
  static <A extends Annotation> A obtainAnnotationFrom(@NonNull Class<?> fromClass, @NonNull Class<A> classOfAnnotation, @Nullable Class<?> maxSuperClass) {
    final boolean present = fromClass.isAnnotationPresent(classOfAnnotation);
    if (present) {
      return fromClass.getAnnotation(classOfAnnotation);
    } else if (maxSuperClass != null) {
      final Class<?> parent = fromClass.getSuperclass();
      if (parent != null && !parent.equals(maxSuperClass)) {
        return obtainAnnotationFrom(parent, classOfAnnotation, maxSuperClass);
      }
    }
    return null;
  }
}

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