/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package java.lang.reflect;

import java.lang.annotation.*;
import java.util.Objects;
import sun.reflect.annotation.AnnotationSupport;
import sun.reflect.annotation.AnnotationType;

/**
 * This class provides static utility methods to be called by
 * implementations of {@link AnnotatedElement}, including the default
 * methods in that interface.
 */
class AnnotatedElementSupport {
    public static <T extends Annotation> T[] getAnnotationsByTypeDeclaredOrNot(AnnotatedElement element,
                                                                               Class<T> annotationClass,
                                                                               boolean declared) {
        Objects.requireNonNull(annotationClass);
        T annotation = (declared ?
                        element.getDeclaredAnnotation(annotationClass):
                        element.getAnnotation(annotationClass));
        @SuppressWarnings("unchecked")
        T[] annotations =  (T[]) Array.newInstance(annotationClass, 0);
        int resultSize = 0;

        // If the annotation type is directly present, return it boxed
        // in an array.
        if (annotation != null) {
            resultSize = 1;
        } else { // Otherwise, if the annotation type is repeatable,
                 // look through a container if one is present
            Repeatable repeatable = annotationClass.getAnnotation(Repeatable.class);
            if (repeatable != null) { // T is a repeatable annotation type
                Class<? extends Annotation> containerType = repeatable.value();
                Annotation container = (declared ?
                                        element.getDeclaredAnnotation(containerType):
                                        element.getAnnotation(containerType));
                if (container != null) {
                    annotations = AnnotationSupport.getValueArray(container);
                    resultSize = annotations.length;
                    if (resultSize == 1)
                        annotation = annotations[0];
                }
            }
        }

        @SuppressWarnings("unchecked")
        T[] returnValue =  (T[]) Array.newInstance(annotationClass, resultSize);
        switch (resultSize) {
        case 0:
            break; // Nothing else do to
        case 1:
            returnValue[0] = annotation;
            break;
        default:
            for (int i = 0; i < resultSize; i++) {
                returnValue[i] = annotations[i];
            }
            break;
        }
        return returnValue;
    }
}