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 com.intellij.psi.PsiElement;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.annotations.Nullable;
023    import org.jetbrains.kotlin.lexer.KtTokens;
024    import org.jetbrains.kotlin.psi.stubs.KotlinTypeParameterStub;
025    import org.jetbrains.kotlin.psi.stubs.elements.KtStubElementTypes;
026    import org.jetbrains.kotlin.types.Variance;
027    
028    public class KtTypeParameter extends KtNamedDeclarationStub<KotlinTypeParameterStub> {
029    
030        public KtTypeParameter(@NotNull ASTNode node) {
031            super(node);
032        }
033    
034        public KtTypeParameter(@NotNull KotlinTypeParameterStub stub) {
035            super(stub, KtStubElementTypes.TYPE_PARAMETER);
036        }
037    
038        @Override
039        public <R, D> R accept(@NotNull KtVisitor<R, D> visitor, D data) {
040            return visitor.visitTypeParameter(this, data);
041        }
042    
043        @NotNull
044        public Variance getVariance() {
045            KotlinTypeParameterStub stub = getStub();
046            if (stub != null) {
047                if (stub.isOutVariance()) return Variance.OUT_VARIANCE;
048                if (stub.isInVariance()) return Variance.IN_VARIANCE;
049                return Variance.INVARIANT;
050            }
051    
052            KtModifierList modifierList = getModifierList();
053            if (modifierList == null) return Variance.INVARIANT;
054    
055            if (modifierList.hasModifier(KtTokens.OUT_KEYWORD)) return Variance.OUT_VARIANCE;
056            if (modifierList.hasModifier(KtTokens.IN_KEYWORD)) return Variance.IN_VARIANCE;
057            return Variance.INVARIANT;
058        }
059    
060        @Nullable
061        public KtTypeReference setExtendsBound(@Nullable KtTypeReference typeReference) {
062            KtTypeReference currentExtendsBound = getExtendsBound();
063            if (currentExtendsBound != null) {
064                if (typeReference == null) {
065                    PsiElement colon = findChildByType(KtTokens.COLON);
066                    if (colon != null) colon.delete();
067                    currentExtendsBound.delete();
068                    return null;
069                }
070                return (KtTypeReference) currentExtendsBound.replace(typeReference);
071            }
072    
073            if (typeReference != null) {
074                PsiElement colon = addAfter(new KtPsiFactory(getProject()).createColon(), getNameIdentifier());
075                return (KtTypeReference) addAfter(typeReference, colon);
076            }
077    
078            return null;
079        }
080    
081        @Nullable
082        public KtTypeReference getExtendsBound() {
083            return getStubOrPsiChild(KtStubElementTypes.TYPE_REFERENCE);
084        }
085    }