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.core;
54:
55: import freemarker.template.*;
56:
57: /**
58: * A class that represents a Range between two integers.
59: * inclusive of the end-points. It can be ascending or
60: * descending.
61: * @author <a href="mailto:jon@revusky.com">Jonathan Revusky</a>
62: */
63: class NumericalRange implements TemplateSequenceModel,
64: java.io.Serializable {
65:
66: private int lower, upper;
67: private boolean descending, norhs; // if norhs is true, then we have a half-range, like n..
68:
69: /**
70: * Constructor for half-range, i.e. n..
71: */
72: public NumericalRange(int lower) {
73: this .norhs = true;
74: this .lower = lower;
75: }
76:
77: public NumericalRange(int left, int right) {
78: lower = Math.min(left, right);
79: upper = Math.max(left, right);
80: descending = (left != lower);
81: }
82:
83: public TemplateModel get(int i) throws TemplateModelException {
84: int index = descending ? (upper - i) : (lower + i);
85: if ((norhs && index > upper) || index < lower) {
86: throw new TemplateModelException("out of bounds of range");
87: }
88: return new SimpleNumber(index);
89: }
90:
91: public int size() {
92: return 1 + upper - lower;
93: }
94:
95: boolean hasRhs() {
96: return !norhs;
97: }
98: }
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