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 <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
033            return visitor.visitTypeConstraint(this, data);
034        }
035    
036        public boolean isClassObjectConstraint() {
037            return findChildByType(JetTokens.CLASS_KEYWORD) != null &&
038                    findChildByType(JetTokens.OBJECT_KEYWORD) != null;
039        }
040    
041        @Nullable @IfNotParsed
042        public JetSimpleNameExpression getSubjectTypeParameterName() {
043            return (JetSimpleNameExpression) findChildByType(JetNodeTypes.REFERENCE_EXPRESSION);
044        }
045    
046        @Nullable @IfNotParsed
047        public JetTypeReference getBoundTypeReference() {
048            boolean passedColon = false;
049            ASTNode node = getNode().getFirstChildNode();
050            while (node != null) {
051                IElementType tt = node.getElementType();
052                if (tt == JetTokens.COLON) passedColon = true;
053                if (passedColon && tt == JetNodeTypes.TYPE_REFERENCE) return (JetTypeReference) node.getPsi();
054                node = node.getTreeNext();
055            }
056    
057            return null;
058        }
059    }