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
017package org.jetbrains.jet.lang.psi;
018
019import com.intellij.lang.ASTNode;
020import com.intellij.psi.tree.IElementType;
021import org.jetbrains.annotations.NotNull;
022import org.jetbrains.annotations.Nullable;
023import org.jetbrains.jet.JetNodeTypes;
024import org.jetbrains.jet.lexer.JetTokens;
025
026public 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}