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
017package org.jetbrains.jet.lang.descriptors.impl;
018
019import org.jetbrains.annotations.NotNull;
020import org.jetbrains.annotations.Nullable;
021import org.jetbrains.jet.lang.descriptors.DeclarationDescriptorVisitor;
022import org.jetbrains.jet.lang.descriptors.ReceiverParameterDescriptor;
023import org.jetbrains.jet.lang.descriptors.annotations.AnnotationDescriptor;
024import org.jetbrains.jet.lang.resolve.name.Name;
025import org.jetbrains.jet.lang.resolve.scopes.receivers.TransientReceiver;
026import org.jetbrains.jet.lang.types.JetType;
027import org.jetbrains.jet.lang.types.TypeSubstitutor;
028import org.jetbrains.jet.lang.types.Variance;
029
030import java.util.Collections;
031
032public 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}