| /* |
| * $Id$ |
| * |
| * 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.apache.tiles.request.freemarker.autotag; |
| |
| import freemarker.template.TemplateModel; |
| import freemarker.template.TemplateModelException; |
| import freemarker.template.utility.DeepUnwrap; |
| |
| /** |
| * Utilities for FreeMarker usage in Tiles. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public final class FreemarkerUtil { |
| |
| /** |
| * Private constructor to avoid instantiation. |
| */ |
| private FreemarkerUtil() { |
| } |
| |
| /** |
| * Unwraps a TemplateModel to extract an object. |
| * |
| * @param model The TemplateModel to unwrap. |
| * @param defaultValue The default value, as specified in the template |
| * model, or null if not specified. |
| * @return The unwrapped object. |
| */ |
| public static <T> T getAsObject(TemplateModel model, Class<T> type, T defaultValue) { |
| try { |
| T retValue = defaultValue; |
| if (model != null) { |
| @SuppressWarnings("unchecked") |
| T value = (T) DeepUnwrap.unwrap(model); |
| if (value != null) { |
| retValue = value; |
| } |
| } |
| return retValue; |
| } catch (TemplateModelException e) { |
| throw new FreemarkerAutotagException("Cannot unwrap a model", e); |
| } |
| } |
| } |