| /* |
| * $Id$ |
| * |
| * 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.extractor; |
| |
| import java.util.Enumeration; |
| |
| import org.apache.tiles.request.attribute.AttributeExtractor; |
| import org.apache.tiles.request.collection.IteratorEnumeration; |
| import org.apache.tiles.request.freemarker.FreemarkerRequestException; |
| |
| import freemarker.core.Environment; |
| import freemarker.template.TemplateModel; |
| import freemarker.template.TemplateModelException; |
| import freemarker.template.utility.DeepUnwrap; |
| |
| /** |
| * Extract attributes from {@link Environment} objects as a scope. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class EnvironmentScopeExtractor implements AttributeExtractor { |
| |
| /** |
| * The environment. |
| */ |
| private Environment request; |
| |
| /** |
| * Constructor. |
| * |
| * @param request The environment. |
| */ |
| public EnvironmentScopeExtractor(Environment request) { |
| this.request = request; |
| } |
| |
| @Override |
| public void removeValue(String name) { |
| request.setVariable(name, null); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Enumeration<String> getKeys() { |
| try { |
| return new IteratorEnumeration<String>(request |
| .getKnownVariableNames().iterator()); |
| } catch (TemplateModelException e) { |
| throw new FreemarkerRequestException( |
| "Cannot iterate variable names correctly", e); |
| } |
| } |
| |
| @Override |
| public Object getValue(String key) { |
| try { |
| TemplateModel variable = request.getVariable(key); |
| if (variable != null) { |
| return DeepUnwrap.unwrap(variable); |
| } |
| return null; |
| } catch (TemplateModelException e) { |
| throw new FreemarkerRequestException( |
| "Cannot get attribute with name '" + key + "'", e); |
| } |
| } |
| |
| @Override |
| public void setValue(String key, Object value) { |
| try { |
| TemplateModel model = request.getObjectWrapper().wrap(value); |
| request.setVariable(key, model); |
| } catch (TemplateModelException e) { |
| throw new FreemarkerRequestException( |
| "Error when wrapping an object setting the '" + key |
| + "' attribute", e); |
| } |
| } |
| } |