| /* |
| * 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.utility; |
| |
| import java.util.List; |
| |
| import freemarker.ext.beans.BeansWrapper; |
| import freemarker.template.TemplateMethodModelEx; |
| import freemarker.template.TemplateModelException; |
| |
| /** |
| * An object that you can make available in a template |
| * to instantiate arbitrary beans-wrapped objects in a template. |
| * Beware of this class's security implications. It allows |
| * the instantiation of arbitrary objects and invoking |
| * methods on them. Usage is something like: |
| * <br> |
| * <br>myDataModel.put("objectConstructor", new ObjectConstructor()); |
| * <br> |
| * <br>And then from your FTL code: |
| * <br> |
| * <br><#assign aList = objectConstructor("java.util.ArrayList", 100)> |
| */ |
| public class ObjectConstructor implements TemplateMethodModelEx { |
| @Override |
| public Object exec(List args) throws TemplateModelException { |
| if (args.isEmpty()) { |
| throw new TemplateModelException("This method must have at least one argument, the name of the class to instantiate."); |
| } |
| String classname = args.get(0).toString(); |
| Class cl = null; |
| try { |
| cl = ClassUtil.forName(classname); |
| } catch (Exception e) { |
| throw new TemplateModelException(e.getMessage()); |
| } |
| BeansWrapper bw = BeansWrapper.getDefaultInstance(); |
| Object obj = bw.newInstance(cl, args.subList(1, args.size())); |
| return bw.wrap(obj); |
| } |
| } |