| /* |
| * 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.ext.beans; |
| |
| import java.util.Collection; |
| import java.util.List; |
| |
| import freemarker.ext.util.ModelFactory; |
| import freemarker.template.ObjectWrapper; |
| import freemarker.template.TemplateCollectionModel; |
| import freemarker.template.TemplateModel; |
| import freemarker.template.TemplateModelException; |
| import freemarker.template.TemplateModelIterator; |
| import freemarker.template.TemplateSequenceModel; |
| |
| /** |
| * <p>A special case of {@link BeanModel} that can wrap Java collections |
| * and that implements the {@link TemplateCollectionModel} in order to be usable |
| * in a <tt><#list></tt> block.</p> |
| */ |
| public class CollectionModel |
| extends |
| StringModel |
| implements |
| TemplateCollectionModel, |
| TemplateSequenceModel { |
| static final ModelFactory FACTORY = |
| new ModelFactory() |
| { |
| public TemplateModel create(Object object, ObjectWrapper wrapper) { |
| return new CollectionModel((Collection) object, (BeansWrapper) wrapper); |
| } |
| }; |
| |
| |
| /** |
| * Creates a new model that wraps the specified collection object. |
| * @param collection the collection object to wrap into a model. |
| * @param wrapper the {@link BeansWrapper} associated with this model. |
| * Every model has to have an associated {@link BeansWrapper} instance. The |
| * model gains many attributes from its wrapper, including the caching |
| * behavior, method exposure level, method-over-item shadowing policy etc. |
| */ |
| public CollectionModel(Collection collection, BeansWrapper wrapper) { |
| super(collection, wrapper); |
| } |
| |
| /** |
| * Retrieves the i-th object from the collection, wrapped as a TemplateModel. |
| * @throws TemplateModelException if the index is out of bounds, or the |
| * underlying collection is not a List. |
| */ |
| public TemplateModel get(int index) |
| throws TemplateModelException { |
| // Don't forget to keep getSupportsIndexedAccess in sync with this! |
| if (object instanceof List) { |
| try { |
| return wrap(((List) object).get(index)); |
| } catch (IndexOutOfBoundsException e) { |
| return null; |
| // throw new TemplateModelException("Index out of bounds: " + index); |
| } |
| } else { |
| throw new TemplateModelException("Underlying collection is not a list, it's " + object.getClass().getName()); |
| } |
| } |
| |
| /** |
| * Tells if {@link #get(int)} will always fail for this object. |
| * As this object implements {@link TemplateSequenceModel}, |
| * {@link #get(int)} should always work, but due to a design flaw, for |
| * non-{@link List} wrapped objects {@link #get(int)} will always fail. |
| * This method exists to ease working this problem around. |
| * |
| * @since 2.3.17 |
| */ |
| public boolean getSupportsIndexedAccess() { |
| return object instanceof List; |
| } |
| |
| public TemplateModelIterator iterator() { |
| return new IteratorModel(((Collection) object).iterator(), wrapper); |
| } |
| |
| @Override |
| public int size() { |
| return ((Collection) object).size(); |
| } |
| |
| } |