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.psi;
018    
019    import com.intellij.lang.ASTNode;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.kotlin.psi.stubs.KotlinTypeParameterStub;
023    import org.jetbrains.kotlin.psi.stubs.elements.JetStubElementTypes;
024    import org.jetbrains.kotlin.types.Variance;
025    import org.jetbrains.kotlin.lexer.JetTokens;
026    
027    public class JetTypeParameter extends JetNamedDeclarationStub<KotlinTypeParameterStub> {
028    
029        public JetTypeParameter(@NotNull ASTNode node) {
030            super(node);
031        }
032    
033        public JetTypeParameter(@NotNull KotlinTypeParameterStub stub) {
034            super(stub, JetStubElementTypes.TYPE_PARAMETER);
035        }
036    
037        @Override
038        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
039            return visitor.visitTypeParameter(this, data);
040        }
041    
042        @NotNull
043        public Variance getVariance() {
044            KotlinTypeParameterStub stub = getStub();
045            if (stub != null) {
046                if (stub.isOutVariance()) return Variance.OUT_VARIANCE;
047                if (stub.isInVariance()) return Variance.IN_VARIANCE;
048                return Variance.INVARIANT;
049            }
050    
051            JetModifierList modifierList = getModifierList();
052            if (modifierList == null) return Variance.INVARIANT;
053    
054            if (modifierList.hasModifier(JetTokens.OUT_KEYWORD)) return Variance.OUT_VARIANCE;
055            if (modifierList.hasModifier(JetTokens.IN_KEYWORD)) return Variance.IN_VARIANCE;
056            return Variance.INVARIANT;
057        }
058    
059        @Nullable
060        public JetTypeReference getExtendsBound() {
061            return getStubOrPsiChild(JetStubElementTypes.TYPE_REFERENCE);
062        }
063    }