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.lang.resolve.scopes;
018    
019    import kotlin.Function1;
020    import kotlin.KotlinPackage;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.annotations.Nullable;
023    import org.jetbrains.jet.lang.descriptors.*;
024    import org.jetbrains.jet.lang.resolve.name.Name;
025    import org.jetbrains.jet.utils.Printer;
026    
027    import java.util.Collection;
028    import java.util.List;
029    
030    public class FilteringScope implements JetScope {
031        private final JetScope workerScope;
032        private final Function1<DeclarationDescriptor, Boolean> predicate;
033    
034        public FilteringScope(@NotNull JetScope workerScope, @NotNull Function1<DeclarationDescriptor, Boolean> predicate) {
035            this.workerScope = workerScope;
036            this.predicate = predicate;
037        }
038    
039        @NotNull
040        @Override
041        public Collection<FunctionDescriptor> getFunctions(@NotNull Name name) {
042            return KotlinPackage.filter(workerScope.getFunctions(name), predicate);
043        }
044    
045        @NotNull
046        @Override
047        public DeclarationDescriptor getContainingDeclaration() {
048            return workerScope.getContainingDeclaration();
049        }
050    
051        @Nullable
052        private <D extends DeclarationDescriptor> D filterDescriptor(@Nullable D descriptor) {
053            return descriptor != null && predicate.invoke(descriptor) ? descriptor : null;
054        }
055    
056        @Nullable
057        @Override
058        public PackageViewDescriptor getPackage(@NotNull Name name) {
059            return filterDescriptor(workerScope.getPackage(name));
060        }
061    
062        @Override
063        public ClassifierDescriptor getClassifier(@NotNull Name name) {
064            return filterDescriptor(workerScope.getClassifier(name));
065        }
066    
067        @NotNull
068        @Override
069        public Collection<VariableDescriptor> getProperties(@NotNull Name name) {
070            return KotlinPackage.filter(workerScope.getProperties(name), predicate);
071        }
072    
073        @Override
074        public VariableDescriptor getLocalVariable(@NotNull Name name) {
075            return filterDescriptor(workerScope.getLocalVariable(name));
076        }
077    
078        @NotNull
079        @Override
080        public Collection<DeclarationDescriptor> getAllDescriptors() {
081            return KotlinPackage.filter(workerScope.getAllDescriptors(), predicate);
082        }
083    
084        @NotNull
085        @Override
086        public List<ReceiverParameterDescriptor> getImplicitReceiversHierarchy() {
087            return workerScope.getImplicitReceiversHierarchy();
088        }
089    
090        @NotNull
091        @Override
092        public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull Name labelName) {
093            return KotlinPackage.filter(workerScope.getDeclarationsByLabel(labelName), predicate);
094        }
095    
096        @NotNull
097        @Override
098        public Collection<DeclarationDescriptor> getOwnDeclaredDescriptors() {
099            return KotlinPackage.filter(workerScope.getOwnDeclaredDescriptors(), predicate);
100        }
101    
102        @Override
103        public void printScopeStructure(@NotNull Printer p) {
104            p.println(getClass().getSimpleName(), " {");
105            p.pushIndent();
106    
107            p.print("workerScope = ");
108            workerScope.printScopeStructure(p.withholdIndentOnce());
109    
110            p.popIndent();
111            p.println("}");
112        }
113    }