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.lazy.descriptors;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.jet.lang.descriptors.*;
022    import org.jetbrains.jet.lang.psi.JetDeclaration;
023    import org.jetbrains.jet.lang.psi.JetFile;
024    import org.jetbrains.jet.lang.resolve.DescriptorUtils;
025    import org.jetbrains.jet.lang.resolve.lazy.ResolveSession;
026    import org.jetbrains.jet.lang.resolve.lazy.declarations.PackageMemberDeclarationProvider;
027    import org.jetbrains.jet.lang.resolve.name.Name;
028    import org.jetbrains.jet.lang.resolve.scopes.JetScope;
029    
030    import java.util.Collection;
031    import java.util.Collections;
032    import java.util.Set;
033    
034    public class LazyPackageMemberScope extends AbstractLazyMemberScope<PackageFragmentDescriptor, PackageMemberDeclarationProvider> {
035    
036        public LazyPackageMemberScope(@NotNull ResolveSession resolveSession,
037                @NotNull PackageMemberDeclarationProvider declarationProvider,
038                @NotNull PackageFragmentDescriptor thisPackage) {
039            super(resolveSession, declarationProvider, thisPackage);
040        }
041    
042        @Nullable
043        @Override
044        public PackageViewDescriptor getPackage(@NotNull Name name) {
045            return null;
046        }
047    
048        @Override
049        public ClassifierDescriptor getClassifier(@NotNull Name name) {
050            // TODO: creating an FqName every time may be a performance problem
051            Name actualName = resolveSession.resolveClassifierAlias(DescriptorUtils.getFqNameSafe(thisDescriptor), name);
052            return super.getClassifier(actualName);
053        }
054    
055        @NotNull
056        @Override
057        protected JetScope getScopeForMemberDeclarationResolution(JetDeclaration declaration) {
058            return resolveSession.getScopeProvider().getFileScope((JetFile) declaration.getContainingFile());
059        }
060    
061        @Override
062        protected ReceiverParameterDescriptor getImplicitReceiver() {
063            return ReceiverParameterDescriptor.NO_RECEIVER_PARAMETER;
064        }
065    
066        @Override
067        protected void getNonDeclaredFunctions(@NotNull Name name, @NotNull Set<FunctionDescriptor> result) {
068            // No extra functions
069        }
070    
071        @Override
072        protected void getNonDeclaredProperties(@NotNull Name name, @NotNull Set<VariableDescriptor> result) {
073            // No extra properties
074        }
075    
076        @NotNull
077        @Override
078        protected Collection<DeclarationDescriptor> computeExtraDescriptors() {
079            return Collections.emptyList();
080        }
081    
082        @Override
083        public String toString() {
084            // Do not add details here, they may compromise the laziness during debugging
085            return "lazy scope for package " + thisDescriptor.getName();
086        }
087    }