| /* |
| * 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.InternalCompilerException; |
| import com.google.gwt.dev.jjs.SourceInfo; |
| import com.google.gwt.dev.jjs.SourceOrigin; |
| |
| /** |
| * Java null reference type. |
| */ |
| public class JNullType extends JReferenceType { |
| |
| public static final JNullType INSTANCE = new JNullType(SourceOrigin.UNKNOWN); |
| |
| private JNullType(SourceInfo sourceInfo) { |
| super(sourceInfo, "null"); |
| } |
| |
| @Override |
| public String getClassLiteralFactoryMethod() { |
| throw new InternalCompilerException("Cannot get class literal for null type"); |
| } |
| |
| @Override |
| public String getJavahSignatureName() { |
| return "N"; |
| } |
| |
| @Override |
| public String getJsniSignatureName() { |
| return "N"; |
| } |
| |
| public boolean isAbstract() { |
| return false; |
| } |
| |
| public boolean isFinal() { |
| return true; |
| } |
| |
| public void traverse(JVisitor visitor, Context ctx) { |
| if (visitor.visit(this, ctx)) { |
| } |
| visitor.endVisit(this, ctx); |
| } |
| |
| private Object readResolve() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public JNonNullType getNonNull() { |
| throw new UnsupportedOperationException(); |
| } |
| } |