| /* |
| * Copyright 2016 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; |
| |
| /** |
| * An unsafe type coercion (mostly resulting form the UncheckedCast annotation). |
| */ |
| public class JUnsafeTypeCoercion extends JExpression { |
| |
| private JType coercionType; |
| private JExpression expression; |
| |
| public JUnsafeTypeCoercion(SourceInfo info, JType coercionType, JExpression expression) { |
| super(info); |
| this.coercionType = coercionType; |
| this.expression = expression; |
| } |
| |
| public JType getCoercionType() { |
| return coercionType; |
| } |
| |
| public JExpression getExpression() { |
| return expression; |
| } |
| |
| @Override |
| public JType getType() { |
| if (!expression.getType().canBeNull() && !coercionType.isNullType()) { |
| // Strengthen type to non null unless it has been determined that the type is not instantiable |
| // (and that is reflected by replacing the coercion type by the null type). |
| return coercionType.strengthenToNonNull(); |
| } |
| return coercionType; |
| } |
| |
| @Override |
| public boolean hasSideEffects() { |
| return expression.hasSideEffects(); |
| } |
| |
| /** |
| * Resolve an external reference during AST stitching. |
| */ |
| public void resolve(JType coercionType) { |
| assert coercionType.replaces(this.coercionType); |
| this.coercionType = coercionType; |
| } |
| |
| @Override |
| public void traverse(JVisitor visitor, Context ctx) { |
| if (visitor.visit(this, ctx)) { |
| expression = visitor.accept(expression); |
| } |
| visitor.endVisit(this, ctx); |
| } |
| |
| } |