001    /*
002     * Copyright 2010-2014 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    
017    package org.jetbrains.jet.lang.descriptors.annotations;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.jet.lang.resolve.name.FqName;
022    
023    import java.util.Collections;
024    import java.util.Iterator;
025    
026    public interface Annotations extends Iterable<AnnotationDescriptor> {
027        Annotations EMPTY = new Annotations() {
028            @Override
029            public boolean isEmpty() {
030                return true;
031            }
032    
033            @Nullable
034            @Override
035            public AnnotationDescriptor findAnnotation(@NotNull FqName fqName) {
036                return null;
037            }
038    
039            @NotNull
040            @Override
041            public Iterator<AnnotationDescriptor> iterator() {
042                return Collections.<AnnotationDescriptor>emptyList().iterator();
043            }
044        };
045    
046        boolean isEmpty();
047    
048        @Nullable
049        AnnotationDescriptor findAnnotation(@NotNull FqName fqName);
050    }