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.PsiElement;
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    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            return findChildByType(JetTokens.WHEN_KEYWORD);
051        }
052    
053        @Nullable
054        public PsiElement getCloseBraceNode() {
055            ASTNode openBraceNode = getNode().findChildByType(JetTokens.RBRACE);
056            return openBraceNode != null ? openBraceNode.getPsi() : null;
057        }
058    
059        @Nullable
060        public JetExpression getElseExpression() {
061            for (JetWhenEntry entry : getEntries()) {
062                if (entry.isElse()) {
063                    return entry.getExpression();
064                }
065            }
066            return null;
067        }
068    }