01: /*
02: * Copyright 2007 Google Inc.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License"); you may not
05: * use this file except in compliance with the License. You may obtain a copy of
06: * the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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: }
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