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.lazy.declarations;
018    
019    import com.intellij.psi.NavigatablePsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.jet.lang.psi.JetClassOrObject;
022    import org.jetbrains.jet.lang.psi.JetDeclaration;
023    import org.jetbrains.jet.lang.psi.JetNamedFunction;
024    import org.jetbrains.jet.lang.psi.JetProperty;
025    import org.jetbrains.jet.lang.resolve.name.FqName;
026    import org.jetbrains.jet.lang.resolve.name.Name;
027    
028    import java.util.Collection;
029    import java.util.Collections;
030    import java.util.List;
031    
032    public class EmptyPackageMemberDeclarationProvider implements PackageMemberDeclarationProvider {
033    
034        public static final EmptyPackageMemberDeclarationProvider INSTANCE = new EmptyPackageMemberDeclarationProvider();
035    
036        private EmptyPackageMemberDeclarationProvider() {}
037    
038        @Override
039        public boolean isPackageDeclared(@NotNull Name name) {
040            return false;
041        }
042    
043        @Override
044        public Collection<FqName> getAllDeclaredPackages() {
045            return Collections.emptyList();
046        }
047    
048        @NotNull
049        @Override
050        public Collection<NavigatablePsiElement> getPackageDeclarations(FqName fqName) {
051            return Collections.emptyList();
052        }
053    
054        @Override
055        public List<JetDeclaration> getAllDeclarations() {
056            return Collections.emptyList();
057        }
058    
059        @NotNull
060        @Override
061        public Collection<JetNamedFunction> getFunctionDeclarations(@NotNull Name name) {
062            return Collections.emptyList();
063        }
064    
065        @NotNull
066        @Override
067        public Collection<JetProperty> getPropertyDeclarations(@NotNull Name name) {
068            return Collections.emptyList();
069        }
070    
071        @NotNull
072        @Override
073        public Collection<JetClassOrObject> getClassOrObjectDeclarations(@NotNull Name name) {
074            return Collections.emptyList();
075        }
076    }