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.psi;
018    
019    import com.intellij.lang.ASTNode;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.jet.lang.psi.stubs.PsiJetTypeConstraintStub;
023    import org.jetbrains.jet.lang.psi.stubs.elements.JetStubElementTypes;
024    import org.jetbrains.jet.lexer.JetTokens;
025    
026    public class JetTypeConstraint extends JetElementImplStub<PsiJetTypeConstraintStub> {
027        public JetTypeConstraint(@NotNull ASTNode node) {
028            super(node);
029        }
030    
031        public JetTypeConstraint(@NotNull PsiJetTypeConstraintStub stub) {
032            super(stub, JetStubElementTypes.TYPE_CONSTRAINT);
033        }
034    
035        @Override
036        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
037            return visitor.visitTypeConstraint(this, data);
038        }
039    
040        public boolean isClassObjectConstraint() {
041            PsiJetTypeConstraintStub stub = getStub();
042            if (stub != null) {
043                return stub.isClassObjectConstraint();
044            }
045            return findChildByType(JetTokens.CLASS_KEYWORD) != null &&
046                    findChildByType(JetTokens.OBJECT_KEYWORD) != null;
047        }
048    
049        @Nullable @IfNotParsed
050        public JetSimpleNameExpression getSubjectTypeParameterName() {
051            return getStubOrPsiChild(JetStubElementTypes.REFERENCE_EXPRESSION);
052        }
053    
054        @Nullable @IfNotParsed
055        public JetTypeReference getBoundTypeReference() {
056            return getStubOrPsiChild(JetStubElementTypes.TYPE_REFERENCE);
057        }
058    }