01: /*
02: * Copyright (c) 2003 The Visigoth Software Society. All rights
03: * reserved.
04: *
05: * Redistribution and use in source and binary forms, with or without
06: * modification, are permitted provided that the following conditions
07: * are met:
08: *
09: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: *
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in
14: * the documentation and/or other materials provided with the
15: * distribution.
16: *
17: * 3. The end-user documentation included with the redistribution, if
18: * any, must include the following acknowledgement:
19: * "This product includes software developed by the
20: * Visigoth Software Society (http://www.visigoths.org/)."
21: * Alternately, this acknowledgement may appear in the software itself,
22: * if and wherever such third-party acknowledgements normally appear.
23: *
24: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
25: * project contributors may be used to endorse or promote products derived
26: * from this software without prior written permission. For written
27: * permission, please contact visigoths@visigoths.org.
28: *
29: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
30: * nor may "FreeMarker" or "Visigoth" appear in their names
31: * without prior written permission of the Visigoth Software Society.
32: *
33: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
37: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
43: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: * SUCH DAMAGE.
45: * ====================================================================
46: *
47: * This software consists of voluntary contributions made by many
48: * individuals on behalf of the Visigoth Software Society. For more
49: * information on the Visigoth Software Society, please see
50: * http://www.visigoths.org/
51: */
52:
53: package freemarker.template;
54:
55: /**
56: * List values in a template data model whose elements are accessed by the
57: * index operator should implement this interface. In addition to
58: * accessing elements by index and querying size using the <code>?size</code>
59: * built-in, objects that implement this interface can be iterated in
60: * <code><#foreach ...></code> and <code><#list ...></code> directives. The
61: * iteration is implemented by calling the {@link #get(int)} method
62: * repeatedly starting from zero and going to <tt>{@link #size()} - 1</tt>.
63: * @author Attila Szegedi, szegedia at users dot sourceforge dot net
64: * @version $Id: TemplateSequenceModel.java,v 1.10 2004/11/27 14:49:57 ddekany Exp $
65: */
66: public interface TemplateSequenceModel extends TemplateModel {
67:
68: /**
69: * Retrieves the i-th template model in this sequence.
70: *
71: * @return the item at the specified index, or <code>null</code> if
72: * the index is out of bounds. Note that a <code>null</code> value is
73: * interpreted by FreeMarker as "variable does not exist", and accessing
74: * a missing variables is usually considered as an error in the FreeMarker
75: * Template Language, so the usage of a bad index will not remain hidden.
76: */
77: TemplateModel get(int index) throws TemplateModelException;
78:
79: /**
80: * @return the number of items in the list.
81: */
82: int size() throws TemplateModelException;
83: }
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