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/*
 * 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).
 * 
 * 

See {@link BeansWrapperBuilder} for more info, as that works identically. * * @since 2.3.21 */ public class DefaultObjectWrapperBuilder extends DefaultObjectWrapperConfiguration { private final static Map>> INSTANCE_CACHE = new WeakHashMap<>(); private final static ReferenceQueue 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 { private static final DefaultObjectWrapperFactory INSTANCE = new DefaultObjectWrapperFactory(); @Override public DefaultObjectWrapper create(DefaultObjectWrapperConfiguration bwConf) { return new DefaultObjectWrapper(bwConf, true); } } }





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