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    
017    package org.jetbrains.jet.descriptors.serialization;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.annotations.ReadOnly;
022    import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
023    import org.jetbrains.jet.lang.resolve.name.FqName;
024    import org.jetbrains.jet.lang.resolve.name.Name;
025    
026    import java.util.Collection;
027    import java.util.Collections;
028    
029    public interface DescriptorFinder {
030        DescriptorFinder EMPTY = new DescriptorFinder() {
031            @Nullable
032            @Override
033            public ClassDescriptor findClass(@NotNull ClassId classId) {
034                return null;
035            }
036    
037            @NotNull
038            @Override
039            public Collection<Name> getClassNames(@NotNull FqName packageName) {
040                return Collections.emptyList();
041            }
042        };
043    
044        @Nullable
045        ClassDescriptor findClass(@NotNull ClassId classId);
046    
047        @ReadOnly
048        @NotNull
049        Collection<Name> getClassNames(@NotNull FqName packageName);
050    }