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 array reference expression.
22: */
23: public class JArrayRef extends JExpression {
24:
25: private JExpression instance;
26: private JExpression indexExpr;
27:
28: public JArrayRef(JProgram program, SourceInfo info,
29: JExpression instance, JExpression indexExpr) {
30: super (program, info);
31: this .instance = instance;
32: this .indexExpr = indexExpr;
33: }
34:
35: public JExpression getIndexExpr() {
36: return indexExpr;
37: }
38:
39: public JExpression getInstance() {
40: return instance;
41: }
42:
43: public JType getType() {
44: JType type = instance.getType();
45: JNullType typeNull = program.getTypeNull();
46: if (type == typeNull) {
47: return typeNull;
48: }
49: JArrayType arrayType = (JArrayType) type;
50: JType elementType = arrayType.getElementType();
51: if (elementType instanceof JReferenceType
52: && !program.typeOracle
53: .isInstantiatedType((JReferenceType) elementType)) {
54: return typeNull;
55: }
56: return elementType;
57: }
58:
59: public boolean hasSideEffects() {
60: return instance.hasSideEffects() || indexExpr.hasSideEffects();
61: }
62:
63: public void traverse(JVisitor visitor, Context ctx) {
64: if (visitor.visit(this, ctx)) {
65: instance = visitor.accept(instance);
66: indexExpr = visitor.accept(indexExpr);
67: }
68: visitor.endVisit(this, ctx);
69: }
70:
71: }
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