/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* Licensed 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;
/**
* "sequence" template language data type; an object that contains other objects accessible through an integer 0-based
* index.
*
* <p>
* Used in templates like: {@code mySeq[index]}, {@code <#list mySeq as i>...</#list>}, {@code mySeq?size}, etc.
*
* @see TemplateCollectionModel
*/
public interface TemplateSequenceModel extends TemplateModel {
/**
* Retrieves the i-th template model in this sequence.
*
* @return the item at the specified index, or <code>null</code> if the index is out of bounds. Note that a
* <code>null</code> value is interpreted by FreeMarker as "variable does not exist", and accessing a
* missing variables is usually considered as an error in the FreeMarker Template Language, so the usage of
* a bad index will not remain hidden, unless the default value for that case was also specified in the
* template.
*/
TemplateModel get(int index) throws TemplateModelException;
/**
* @return the number of items in the list.
*/
int size() throws TemplateModelException;
}