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Java > Open Source Codes > com > google > gwt > dev > jjs > ast > JUnaryOperation


1 /*
2  * Copyright 2007 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.dev.jjs.ast;
17
18 import com.google.gwt.dev.jjs.SourceInfo;
19
20 /**
21  * Java prefix or postfix operation expression.
22  */
23 public abstract class JUnaryOperation extends JExpression {
24
25   private JExpression arg;
26   private final JUnaryOperator op;
27
28   public JUnaryOperation(JProgram program, SourceInfo info,
29       JUnaryOperator op, JExpression arg) {
30     super(program, info);
31     this.op = op;
32     this.arg = arg;
33   }
34
35   public JExpression getArg() {
36     return arg;
37   }
38
39   public JUnaryOperator getOp() {
40     return op;
41   }
42
43   public JType getType() {
44     // Unary operators don't change the type of their expression
45 return arg.getType();
46   }
47
48   public boolean hasSideEffects() {
49     return getOp().isModifying() || arg.hasSideEffects();
50   }
51
52   public void traverse(JVisitor visitor, Context ctx) {
53     arg = visitor.accept(arg);
54   }
55 }
56
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