/*
 * Copyright (c) 2022, 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
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package java.lang.classfile;

import java.lang.classfile.attribute.RuntimeInvisibleAnnotationsAttribute;
import java.lang.classfile.attribute.RuntimeInvisibleParameterAnnotationsAttribute;
import java.lang.classfile.attribute.RuntimeVisibleAnnotationsAttribute;
import java.lang.classfile.attribute.RuntimeVisibleParameterAnnotationsAttribute;
import java.lang.classfile.constantpool.Utf8Entry;
import jdk.internal.classfile.impl.AnnotationImpl;
import jdk.internal.classfile.impl.TemporaryConstantPool;

import java.lang.constant.ClassDesc;
import java.util.List;
import jdk.internal.javac.PreviewFeature;

/**
 * Models an annotation on a declaration.
 *
 * @see AnnotationElement
 * @see AnnotationValue
 * @see RuntimeVisibleAnnotationsAttribute
 * @see RuntimeInvisibleAnnotationsAttribute
 * @see RuntimeVisibleParameterAnnotationsAttribute
 * @see RuntimeInvisibleParameterAnnotationsAttribute
 *
 * @sealedGraph
 * @since 22
 */
@PreviewFeature(feature = PreviewFeature.Feature.CLASSFILE_API)
public sealed interface Annotation
        extends WritableElement<Annotation>
        permits TypeAnnotation, AnnotationImpl {

    /**
     * {@return the class of the annotation}
     */
    Utf8Entry className();

    /**
     * {@return the class of the annotation, as a symbolic descriptor}
     */
    default ClassDesc classSymbol() {
        return ClassDesc.ofDescriptor(className().stringValue());
    }

    /**
     * {@return the elements of the annotation}
     */
    List<AnnotationElement> elements();

    /**
     * {@return an annotation}
     * @param annotationClass the class of the annotation
     * @param elements the elements of the annotation
     */
    static Annotation of(Utf8Entry annotationClass,
                         List<AnnotationElement> elements) {
        return new AnnotationImpl(annotationClass, elements);
    }

    /**
     * {@return an annotation}
     * @param annotationClass the class of the annotation
     * @param elements the elements of the annotation
     */
    static Annotation of(Utf8Entry annotationClass,
                         AnnotationElement... elements) {
        return of(annotationClass, List.of(elements));
    }

    /**
     * {@return an annotation}
     * @param annotationClass the class of the annotation
     * @param elements the elements of the annotation
     */
    static Annotation of(ClassDesc annotationClass,
                         List<AnnotationElement> elements) {
        return of(TemporaryConstantPool.INSTANCE.utf8Entry(annotationClass.descriptorString()), elements);
    }

    /**
     * {@return an annotation}
     * @param annotationClass the class of the annotation
     * @param elements the elements of the annotation
     */
    static Annotation of(ClassDesc annotationClass,
                         AnnotationElement... elements) {
        return of(TemporaryConstantPool.INSTANCE.utf8Entry(annotationClass.descriptorString()), elements);
    }
}