| /* |
| * Copyright 2007 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.jjs.ast; |
| |
| import com.google.gwt.dev.jjs.SourceInfo; |
| |
| /** |
| * Java if statement. |
| */ |
| public class JIfStatement extends JStatement { |
| |
| private JStatement elseStmt; |
| private JExpression ifExpr; |
| private JStatement thenStmt; |
| |
| public JIfStatement(SourceInfo info, JExpression ifExpr, JStatement thenStmt, JStatement elseStmt) { |
| super(info); |
| this.ifExpr = ifExpr; |
| this.thenStmt = thenStmt; |
| this.elseStmt = elseStmt; |
| } |
| |
| public JStatement getElseStmt() { |
| return elseStmt; |
| } |
| |
| public JExpression getIfExpr() { |
| return ifExpr; |
| } |
| |
| public JStatement getThenStmt() { |
| return thenStmt; |
| } |
| |
| @Override |
| public void traverse(JVisitor visitor, Context ctx) { |
| if (visitor.visit(this, ctx)) { |
| ifExpr = visitor.accept(ifExpr); |
| if (thenStmt != null) { |
| thenStmt = visitor.accept(thenStmt, true); |
| } |
| if (elseStmt != null) { |
| elseStmt = visitor.accept(elseStmt, true); |
| } |
| } |
| visitor.endVisit(this, ctx); |
| } |
| |
| @Override |
| public boolean unconditionalControlBreak() { |
| boolean thenBreaks = thenStmt != null && thenStmt.unconditionalControlBreak(); |
| if (thenBreaks && ifExpr == JBooleanLiteral.get(true)) { |
| // if(true) { /* unconditional break */ } |
| return true; |
| } |
| |
| boolean elseBreaks = elseStmt != null && elseStmt.unconditionalControlBreak(); |
| if (elseBreaks && ifExpr == JBooleanLiteral.get(false)) { |
| // if(false) { } else { /* unconditional break */ } |
| return true; |
| } |
| |
| if (thenBreaks && elseBreaks) { |
| // both branches have an unconditional break |
| return true; |
| } |
| return false; |
| } |
| } |