com.google.gwt.dev.jjs.ast.JArrayRef Maven / Gradle / Ivy
/*
* Copyright 2008 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 array reference expression.
*/
public class JArrayRef extends JExpression {
private JExpression indexExpr;
private JExpression instance;
public JArrayRef(SourceInfo info, JExpression instance, JExpression indexExpr) {
super(info);
this.instance = instance;
this.indexExpr = indexExpr;
}
public JArrayType getArrayType() {
JType type = instance.getType();
if (type instanceof JNullType) {
return null;
}
return (JArrayType) type.getUnderlyingType();
}
public JExpression getIndexExpr() {
return indexExpr;
}
public JExpression getInstance() {
return instance;
}
@Override
public JType getType() {
JArrayType arrayType = getArrayType();
return (arrayType == null) ? JNullType.INSTANCE : arrayType.getElementType();
}
@Override
public boolean hasSideEffects() {
// TODO: make the last test better when we have null tracking.
return instance.hasSideEffects() || indexExpr.hasSideEffects()
|| instance.getType() == JNullType.INSTANCE;
}
@Override
public void traverse(JVisitor visitor, Context ctx) {
if (visitor.visit(this, ctx)) {
instance = visitor.accept(instance);
indexExpr = visitor.accept(indexExpr);
}
visitor.endVisit(this, ctx);
}
}