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 com.intellij.psi.tree.IElementType;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.annotations.Nullable;
023    import org.jetbrains.jet.JetNodeTypes;
024    import org.jetbrains.jet.lexer.JetTokens;
025    
026    public class JetTypeConstraint extends JetElementImpl {
027        public JetTypeConstraint(@NotNull ASTNode node) {
028            super(node);
029        }
030    
031        @Override
032        public void accept(@NotNull JetVisitorVoid visitor) {
033            visitor.visitTypeConstraint(this);
034        }
035    
036        @Override
037        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
038            return visitor.visitTypeConstraint(this, data);
039        }
040    
041        public boolean isClassObjectContraint() {
042            return findChildByType(JetTokens.CLASS_KEYWORD) != null &&
043                    findChildByType(JetTokens.OBJECT_KEYWORD) != null;
044        }
045    
046        @Nullable @IfNotParsed
047        public JetSimpleNameExpression getSubjectTypeParameterName() {
048            return (JetSimpleNameExpression) findChildByType(JetNodeTypes.REFERENCE_EXPRESSION);
049        }
050    
051        @Nullable @IfNotParsed
052        public JetTypeReference getBoundTypeReference() {
053            boolean passedColon = false;
054            ASTNode node = getNode().getFirstChildNode();
055            while (node != null) {
056                IElementType tt = node.getElementType();
057                if (tt == JetTokens.COLON) passedColon = true;
058                if (passedColon && tt == JetNodeTypes.TYPE_REFERENCE) return (JetTypeReference) node.getPsi();
059                node = node.getTreeNext();
060            }
061    
062            return null;
063        }
064    }