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.JetNodeTypes;
024    import org.jetbrains.kotlin.lexer.JetTokens;
025    
026    import java.util.List;
027    
028    public class JetWhenExpression extends JetExpressionImpl {
029        public JetWhenExpression(@NotNull ASTNode node) {
030            super(node);
031        }
032    
033        @NotNull
034        public List<JetWhenEntry> getEntries() {
035            return findChildrenByType(JetNodeTypes.WHEN_ENTRY);
036        }
037    
038        @Nullable
039        public JetExpression getSubjectExpression() {
040            return findChildByClass(JetExpression.class);
041        }
042    
043        @Override
044        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
045            return visitor.visitWhenExpression(this, data);
046        }
047    
048        @NotNull
049        public PsiElement getWhenKeywordElement() {
050            //noinspection ConstantConditions
051            return findChildByType(JetTokens.WHEN_KEYWORD);
052        }
053    
054        @Nullable
055        public PsiElement getCloseBrace() {
056            return findChildByType(JetTokens.RBRACE);
057        }
058    
059        @Nullable
060        public PsiElement getOpenBrace() {
061            return findChildByType(JetTokens.LBRACE);
062        }
063    
064        @Nullable
065        public PsiElement getLeftParenthesis() {
066            return findChildByType(JetTokens.LPAR);
067        }
068    
069        @Nullable
070        public PsiElement getRightParenthesis() {
071            return findChildByType(JetTokens.RPAR);
072        }
073    
074        @Nullable
075        public JetExpression getElseExpression() {
076            for (JetWhenEntry entry : getEntries()) {
077                if (entry.isElse()) {
078                    return entry.getExpression();
079                }
080            }
081            return null;
082        }
083    }