| /* |
| * 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.cache; |
| |
| import java.io.IOException; |
| |
| import freemarker.core.TemplateConfiguration; |
| import freemarker.template.Configuration; |
| |
| /** |
| * Returns the merged results of all the child factories. The factories are merged in the order as they were added. |
| * {@code null} results from the child factories will be ignored. If all child factories return {@code null}, the result |
| * of this factory will be {@code null} too. |
| * |
| * @since 2.3.24 |
| */ |
| public class MergingTemplateConfigurationFactory extends TemplateConfigurationFactory { |
| |
| private final TemplateConfigurationFactory[] templateConfigurationFactories; |
| |
| public MergingTemplateConfigurationFactory(TemplateConfigurationFactory... templateConfigurationFactories) { |
| this.templateConfigurationFactories = templateConfigurationFactories; |
| } |
| |
| @Override |
| public TemplateConfiguration get(String sourceName, Object templateSource) |
| throws IOException, TemplateConfigurationFactoryException { |
| TemplateConfiguration mergedTC = null; |
| TemplateConfiguration resultTC = null; |
| for (TemplateConfigurationFactory tcf : templateConfigurationFactories) { |
| TemplateConfiguration tc = tcf.get(sourceName, templateSource); |
| if (tc != null) { |
| if (resultTC == null) { |
| resultTC = tc; |
| } else { |
| if (mergedTC == null) { |
| Configuration cfg = getConfiguration(); |
| if (cfg == null) { |
| throw new IllegalStateException( |
| "The TemplateConfigurationFactory wasn't associated to a Configuration yet."); |
| } |
| |
| mergedTC = new TemplateConfiguration(); |
| mergedTC.setParentConfiguration(cfg); |
| mergedTC.merge(resultTC); |
| resultTC = mergedTC; |
| } |
| mergedTC.merge(tc); |
| } |
| } |
| } |
| return resultTC; |
| } |
| |
| @Override |
| protected void setConfigurationOfChildren(Configuration cfg) { |
| for (TemplateConfigurationFactory templateConfigurationFactory : templateConfigurationFactories) { |
| templateConfigurationFactory.setConfiguration(cfg); |
| } |
| } |
| |
| } |