| /* |
| * 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.core; |
| |
| import java.util.List; |
| |
| import freemarker.ext.beans.BeanModel; |
| import freemarker.ext.beans.BeansWrapper; |
| import freemarker.template.ObjectWrapper; |
| import freemarker.template.Template; |
| import freemarker.template.TemplateException; |
| import freemarker.template.TemplateMethodModelEx; |
| import freemarker.template.TemplateModel; |
| import freemarker.template.TemplateModelException; |
| |
| /** |
| * A built-in that allows us to instantiate an instance of a java class. |
| * Usage is something like: <code><#assign foobar = "foo.bar.MyClass"?new()></code>; |
| */ |
| class NewBI extends BuiltIn { |
| |
| static Class<?> JYTHON_MODEL_CLASS; |
| static { |
| try { |
| JYTHON_MODEL_CLASS = Class.forName("freemarker.ext.jython.JythonModel"); |
| } catch (Throwable e) { |
| JYTHON_MODEL_CLASS = null; |
| } |
| } |
| |
| @Override |
| TemplateModel _eval(Environment env) |
| throws TemplateException { |
| return new ConstructorFunction(target.evalAndCoerceToPlainText(env), env, target.getTemplate()); |
| } |
| |
| class ConstructorFunction implements TemplateMethodModelEx { |
| |
| private final Class<?> cl; |
| private final Environment env; |
| |
| public ConstructorFunction(String classname, Environment env, Template template) throws TemplateException { |
| this.env = env; |
| cl = env.getNewBuiltinClassResolver().resolve(classname, env, template); |
| if (!TemplateModel.class.isAssignableFrom(cl)) { |
| throw new _MiscTemplateException(NewBI.this, env, |
| "Class ", cl.getName(), " does not implement freemarker.template.TemplateModel"); |
| } |
| if (BeanModel.class.isAssignableFrom(cl)) { |
| throw new _MiscTemplateException(NewBI.this, env, |
| "Bean Models cannot be instantiated using the ?", key, " built-in"); |
| } |
| if (JYTHON_MODEL_CLASS != null && JYTHON_MODEL_CLASS.isAssignableFrom(cl)) { |
| throw new _MiscTemplateException(NewBI.this, env, |
| "Jython Models cannot be instantiated using the ?", key, " built-in"); |
| } |
| } |
| |
| @Override |
| public Object exec(List arguments) throws TemplateModelException { |
| ObjectWrapper ow = env.getObjectWrapper(); |
| BeansWrapper bw = |
| ow instanceof BeansWrapper |
| ? (BeansWrapper) ow |
| : BeansWrapper.getDefaultInstance(); |
| return bw.newInstance(cl, arguments); |
| } |
| } |
| } |