001    /*
002     * Copyright 2010-2015 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.kotlin.descriptors.impl;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.kotlin.descriptors.*;
022    import org.jetbrains.kotlin.descriptors.annotations.Annotations;
023    import org.jetbrains.kotlin.name.Name;
024    import org.jetbrains.kotlin.resolve.scopes.receivers.TransientReceiver;
025    import org.jetbrains.kotlin.types.KotlinType;
026    import org.jetbrains.kotlin.types.TypeSubstitutor;
027    import org.jetbrains.kotlin.types.Variance;
028    
029    import java.util.Collection;
030    import java.util.Collections;
031    import java.util.List;
032    
033    public abstract class AbstractReceiverParameterDescriptor extends DeclarationDescriptorImpl implements ReceiverParameterDescriptor {
034        private static final Name RECEIVER_PARAMETER_NAME = Name.special("<this>");
035    
036        public AbstractReceiverParameterDescriptor() {
037            super(Annotations.Companion.getEMPTY(), RECEIVER_PARAMETER_NAME);
038        }
039    
040        @Nullable
041        @Override
042        public ReceiverParameterDescriptor substitute(@NotNull TypeSubstitutor substitutor) {
043            if (substitutor.isEmpty()) return this;
044            KotlinType substitutedType = substitutor.substitute(getType(), Variance.INVARIANT);
045            if (substitutedType == null) return null;
046    
047            return new ReceiverParameterDescriptorImpl(getContainingDeclaration(), new TransientReceiver(substitutedType));
048        }
049    
050        @Override
051        public <R, D> R accept(DeclarationDescriptorVisitor<R, D> visitor, D data) {
052            return visitor.visitReceiverParameterDescriptor(this, data);
053        }
054    
055        @Nullable
056        @Override
057        public ReceiverParameterDescriptor getExtensionReceiverParameter() {
058            return null;
059        }
060    
061        @Nullable
062        @Override
063        public ReceiverParameterDescriptor getDispatchReceiverParameter() {
064            return null;
065        }
066    
067        @NotNull
068        @Override
069        public List<TypeParameterDescriptor> getTypeParameters() {
070            return Collections.emptyList();
071        }
072    
073        @Nullable
074        @Override
075        public KotlinType getReturnType() {
076            return getType();
077        }
078    
079        @NotNull
080        @Override
081        public KotlinType getType() {
082            return getValue().getType();
083        }
084    
085        @NotNull
086        @Override
087        public List<ValueParameterDescriptor> getValueParameters() {
088            return Collections.emptyList();
089        }
090    
091        @Override
092        public boolean hasStableParameterNames() {
093            return false;
094        }
095    
096        @Override
097        public boolean hasSynthesizedParameterNames() {
098            return false;
099        }
100    
101        @NotNull
102        @Override
103        public Collection<? extends CallableDescriptor> getOverriddenDescriptors() {
104            return Collections.emptySet();
105        }
106    
107        @NotNull
108        @Override
109        public Visibility getVisibility() {
110            return Visibilities.LOCAL;
111        }
112    
113        @NotNull
114        @Override
115        public ParameterDescriptor getOriginal() {
116            return this;
117        }
118    
119        @NotNull
120        @Override
121        public SourceElement getSource() {
122            return SourceElement.NO_SOURCE;
123        }
124    }