| /* |
| * Copyright 2010 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.autobean.client.impl; |
| |
| import com.google.gwt.autobean.shared.AutoBean; |
| import com.google.gwt.autobean.shared.AutoBeanFactory; |
| import com.google.gwt.autobean.shared.impl.EnumMap; |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Provides base implementations of AutoBeanFactory methods. |
| */ |
| public abstract class AbstractAutoBeanFactory implements AutoBeanFactory, |
| EnumMap { |
| /** |
| * Implementations generated by subtypes. Used to implement the dynamic create |
| * methods. |
| */ |
| protected interface Creator { |
| AutoBean<?> create(); |
| |
| AutoBean<?> create(Object delegate); |
| } |
| |
| protected final Map<Class<?>, Creator> creators = new HashMap<Class<?>, Creator>(); |
| protected Map<Enum<?>, String> enumToStringMap; |
| // This map is almost always one-to-one |
| protected Map<String, List<Enum<?>>> stringsToEnumsMap; |
| |
| @SuppressWarnings("unchecked") |
| public <T> AutoBean<T> create(Class<T> clazz) { |
| Creator c = creators.get(clazz); |
| return c == null ? null : (AutoBean<T>) c.create(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public <T, U extends T> AutoBean<T> create(Class<T> clazz, U delegate) { |
| Creator c = creators.get(clazz); |
| return c == null ? null : (AutoBean<T>) c.create(delegate); |
| } |
| |
| /** |
| * EnumMap support. |
| */ |
| public <E extends Enum<E>> E getEnum(Class<E> clazz, String token) { |
| maybeInitializeEnumMap(); |
| List<Enum<?>> list = stringsToEnumsMap.get(token); |
| if (list == null) { |
| throw new IllegalArgumentException(token); |
| } |
| for (Enum<?> e : list) { |
| if (e.getDeclaringClass().equals(clazz)) { |
| @SuppressWarnings("unchecked") |
| E toReturn = (E) e; |
| return toReturn; |
| } |
| } |
| throw new IllegalArgumentException(clazz.getName()); |
| } |
| |
| /** |
| * EnumMap support. |
| */ |
| public String getToken(Enum<?> e) { |
| maybeInitializeEnumMap(); |
| String toReturn = enumToStringMap.get(e); |
| if (toReturn == null) { |
| throw new IllegalArgumentException(e.toString()); |
| } |
| return toReturn; |
| } |
| |
| protected abstract void initializeEnumMap(); |
| |
| private void maybeInitializeEnumMap() { |
| if (enumToStringMap == null) { |
| enumToStringMap = new HashMap<Enum<?>, String>(); |
| stringsToEnumsMap = new HashMap<String, List<Enum<?>>>(); |
| initializeEnumMap(); |
| } |
| } |
| } |