001/*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.jetbrains.jet.lang.resolve.java.kt;
018
019import com.intellij.psi.PsiAnnotation;
020import com.intellij.psi.PsiClass;
021import org.jetbrains.annotations.NotNull;
022import org.jetbrains.annotations.Nullable;
023import org.jetbrains.jet.lang.resolve.java.JvmStdlibNames;
024import org.jetbrains.jet.lang.resolve.java.resolver.JavaAnnotationResolver;
025
026public class JetPackageClassAnnotation extends PsiAnnotationWithAbiVersion {
027    private static final JetPackageClassAnnotation NULL_ANNOTATION = new JetPackageClassAnnotation(null);
028    static {
029        NULL_ANNOTATION.checkInitialized();
030    }
031
032    private JetPackageClassAnnotation(@Nullable PsiAnnotation psiAnnotation) {
033        super(psiAnnotation);
034    }
035
036    @NotNull
037    public static JetPackageClassAnnotation get(PsiClass psiClass) {
038        PsiAnnotation annotation = JavaAnnotationResolver.findOwnAnnotation(psiClass,
039                                                                                  JvmStdlibNames.JET_PACKAGE_CLASS.getFqName().asString());
040        return annotation != null ? new JetPackageClassAnnotation(annotation) : NULL_ANNOTATION;
041    }
042}