| /* |
| * 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 freemarker.template; |
| |
| import java.lang.ref.ReferenceQueue; |
| import java.lang.ref.WeakReference; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| import freemarker.ext.beans.BeansWrapperBuilder; |
| import freemarker.ext.beans._BeansAPI; |
| |
| /** |
| * Gets/creates a {@link DefaultObjectWrapper} singleton instance that's already configured as specified in the |
| * properties of this object; this is recommended over using the {@link DefaultObjectWrapper} constructors. The returned |
| * instance can't be further configured (it's write protected). |
| * |
| * <p>See {@link BeansWrapperBuilder} for more info, as that works identically. |
| * |
| * @since 2.3.21 |
| */ |
| public class DefaultObjectWrapperBuilder extends DefaultObjectWrapperConfiguration { |
| |
| private final static Map<ClassLoader, Map<DefaultObjectWrapperConfiguration, WeakReference<DefaultObjectWrapper>>> |
| INSTANCE_CACHE = new WeakHashMap<>(); |
| private final static ReferenceQueue<DefaultObjectWrapper> INSTANCE_CACHE_REF_QUEUE |
| = new ReferenceQueue<>(); |
| |
| /** |
| * Creates a builder that creates a {@link DefaultObjectWrapper} with the given {@code incompatibleImprovements}; |
| * using at least 2.3.22 is highly recommended. See {@link DefaultObjectWrapper#DefaultObjectWrapper(Version)} for |
| * more information about the impact of {@code incompatibleImprovements} values. |
| */ |
| public DefaultObjectWrapperBuilder(Version incompatibleImprovements) { |
| super(incompatibleImprovements); |
| } |
| |
| /** For unit testing only */ |
| static void clearInstanceCache() { |
| synchronized (INSTANCE_CACHE) { |
| INSTANCE_CACHE.clear(); |
| } |
| } |
| |
| /** |
| * Returns a {@link DefaultObjectWrapper} instance that matches the settings of this builder. This will be possibly |
| * a singleton that is also in use elsewhere. |
| */ |
| public DefaultObjectWrapper build() { |
| return _BeansAPI.getBeansWrapperSubclassSingleton( |
| this, INSTANCE_CACHE, INSTANCE_CACHE_REF_QUEUE, DefaultObjectWrapperFactory.INSTANCE); |
| } |
| |
| private static class DefaultObjectWrapperFactory |
| implements _BeansAPI._BeansWrapperSubclassFactory<DefaultObjectWrapper, DefaultObjectWrapperConfiguration> { |
| |
| private static final DefaultObjectWrapperFactory INSTANCE = new DefaultObjectWrapperFactory(); |
| |
| @Override |
| public DefaultObjectWrapper create(DefaultObjectWrapperConfiguration bwConf) { |
| return new DefaultObjectWrapper(bwConf, true); |
| } |
| } |
| |
| } |