| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.netbeans.modules.javascript2.model; |
| |
| import org.netbeans.modules.javascript2.model.api.Model; |
| import org.netbeans.modules.javascript2.types.spi.ParserResult; |
| |
| /** |
| * |
| * @author Petr Hejl |
| */ |
| public abstract class ModelAccessor { |
| |
| private static volatile ModelAccessor DEFAULT; |
| |
| public static ModelAccessor getDefault() { |
| ModelAccessor a = DEFAULT; |
| if (a != null) { |
| return a; |
| } |
| |
| // invokes static initializer of Model.class |
| // that will assign value to the DEFAULT field above |
| Class c = Model.class; |
| try { |
| Class.forName(c.getName(), true, c.getClassLoader()); |
| } catch (ClassNotFoundException ex) { |
| assert false : ex; |
| } |
| return DEFAULT; |
| } |
| |
| public static void setDefault(ModelAccessor accessor) { |
| if (DEFAULT != null) { |
| throw new IllegalStateException(); |
| } |
| |
| DEFAULT = accessor; |
| } |
| |
| public abstract Model createModel(ParserResult result); |
| } |