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.resolve;
018    
019    import com.google.common.collect.Maps;
020    import com.intellij.util.containers.ContainerUtil;
021    import com.intellij.util.containers.MultiMap;
022    import org.jetbrains.annotations.NotNull;
023    import org.jetbrains.jet.lang.descriptors.ModuleDescriptor;
024    import org.jetbrains.jet.lang.descriptors.PackageFragmentDescriptor;
025    import org.jetbrains.jet.lang.descriptors.PackageFragmentProvider;
026    import org.jetbrains.jet.lang.descriptors.impl.MutablePackageFragmentDescriptor;
027    import org.jetbrains.jet.lang.resolve.name.FqName;
028    
029    import java.util.Collection;
030    import java.util.List;
031    import java.util.Map;
032    
033    public class MutablePackageFragmentProvider implements PackageFragmentProvider {
034        private final ModuleDescriptor module;
035    
036        private final Map<FqName, MutablePackageFragmentDescriptor> fqNameToPackage = Maps.newHashMap();
037        private final MultiMap<FqName, FqName> subPackages = MultiMap.create();
038    
039        public MutablePackageFragmentProvider(@NotNull ModuleDescriptor module) {
040            this.module = module;
041            fqNameToPackage.put(FqName.ROOT, new MutablePackageFragmentDescriptor(module, FqName.ROOT));
042        }
043    
044        @NotNull
045        @Override
046        public List<PackageFragmentDescriptor> getPackageFragments(@NotNull FqName fqName) {
047            return ContainerUtil.<PackageFragmentDescriptor>createMaybeSingletonList(fqNameToPackage.get(fqName));
048        }
049    
050        @NotNull
051        @Override
052        public Collection<FqName> getSubPackagesOf(@NotNull FqName fqName) {
053            return subPackages.get(fqName);
054        }
055    
056        @NotNull
057        public MutablePackageFragmentDescriptor getOrCreateFragment(@NotNull FqName fqName) {
058            if (!fqNameToPackage.containsKey(fqName)) {
059                FqName parent = fqName.parent();
060                getOrCreateFragment(parent); // assure that parent exists
061    
062                fqNameToPackage.put(fqName, new MutablePackageFragmentDescriptor(module, fqName));
063                subPackages.putValue(parent, fqName);
064            }
065    
066            return fqNameToPackage.get(fqName);
067        }
068    
069        @NotNull
070        public ModuleDescriptor getModule() {
071            return module;
072        }
073    
074        @NotNull
075        public Collection<MutablePackageFragmentDescriptor> getAllFragments() {
076            return fqNameToPackage.values();
077        }
078    }