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.PsiElement;
021import org.jetbrains.annotations.NotNull;
022import org.jetbrains.annotations.Nullable;
023import org.jetbrains.jet.JetNodeTypes;
024import org.jetbrains.jet.lexer.JetTokens;
025
026import java.util.List;
027
028public 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 void accept(@NotNull JetVisitorVoid visitor) {
045        visitor.visitWhenExpression(this);
046    }
047
048    @Override
049    public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
050        return visitor.visitWhenExpression(this, data);
051    }
052
053    @NotNull
054    public PsiElement getWhenKeywordElement() {
055        return findChildByType(JetTokens.WHEN_KEYWORD);
056    }
057
058    @Nullable
059    public PsiElement getCloseBraceNode() {
060        ASTNode openBraceNode = getNode().findChildByType(JetTokens.RBRACE);
061        return openBraceNode != null ? openBraceNode.getPsi() : null;
062    }
063
064    @Nullable
065    public JetExpression getElseExpression() {
066        for (JetWhenEntry entry : getEntries()) {
067            if (entry.isElse()) {
068                return entry.getExpression();
069            }
070        }
071        return null;
072    }
073}