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.descriptors.impl;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.jet.lang.descriptors.DeclarationDescriptorVisitor;
022    import org.jetbrains.jet.lang.descriptors.ReceiverParameterDescriptor;
023    import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
024    import org.jetbrains.jet.lang.resolve.name.Name;
025    import org.jetbrains.jet.lang.resolve.scopes.receivers.TransientReceiver;
026    import org.jetbrains.jet.lang.types.JetType;
027    import org.jetbrains.jet.lang.types.TypeSubstitutor;
028    import org.jetbrains.jet.lang.types.Variance;
029    
030    import java.util.Collections;
031    
032    public abstract class AbstractReceiverParameterDescriptor extends DeclarationDescriptorImpl implements ReceiverParameterDescriptor {
033        private static final Name RECEIVER_PARAMETER_NAME = Name.special("<this>");
034    
035        public AbstractReceiverParameterDescriptor() {
036            super(Collections.<AnnotationDescriptor>emptyList(), RECEIVER_PARAMETER_NAME);
037        }
038    
039        @Nullable
040        @Override
041        public ReceiverParameterDescriptor substitute(@NotNull TypeSubstitutor substitutor) {
042            if (substitutor.isEmpty()) return this;
043            JetType substitutedType = substitutor.substitute(getType(), Variance.INVARIANT);
044            if (substitutedType == null) return null;
045    
046            return new ReceiverParameterDescriptorImpl(getContainingDeclaration(), substitutedType, new TransientReceiver(substitutedType));
047        }
048    
049        @Override
050        public <R, D> R accept(DeclarationDescriptorVisitor<R, D> visitor, D data) {
051            return visitor.visitReceiverParameterDescriptor(this, data);
052        }
053    }