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 JetClassObjectAnnotation extends PsiAnnotationWithAbiVersion {
027
028    private static final JetClassObjectAnnotation NULL_ANNOTATION = new JetClassObjectAnnotation(null);
029
030    static {
031        NULL_ANNOTATION.checkInitialized();
032    }
033
034    private JetClassObjectAnnotation(@Nullable PsiAnnotation psiAnnotation) {
035        super(psiAnnotation);
036    }
037
038    @NotNull
039    public static JetClassObjectAnnotation get(@NotNull PsiClass psiClass) {
040        PsiAnnotation annotation =
041                JavaAnnotationResolver.findOwnAnnotation(psiClass, JvmStdlibNames.JET_CLASS_OBJECT.getFqName().asString());
042        return annotation != null ? new JetClassObjectAnnotation(annotation) : NULL_ANNOTATION;
043    }
044}