/
LastFunction.java
114 lines (105 loc) · 3.86 KB
/
LastFunction.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
/*
* $Header$
* $Revision$
* $Date$
*
* ====================================================================
*
* Copyright 2000-2002 bob mcwhirter & James Strachan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of the Jaxen Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
* This software consists of voluntary contributions made by many
* individuals on behalf of the Jaxen Project and was originally
* created by bob mcwhirter <bob@werken.com> and
* James Strachan <jstrachan@apache.org>. For more information on the
* Jaxen Project, please see <http://www.jaxen.org/>.
*
* $Id$
*/
package org.jaxen.function;
import java.util.List;
import org.jaxen.Context;
import org.jaxen.Function;
import org.jaxen.FunctionCallException;
/**
* <p><b>4.1</b> <code><i>number</i> last()</code> </p>
*
* <blockquote cite="http://www.w3.org/TR/xpath#function-last">
* The <b>last</b> function returns a number equal to
* the context size from the expression evaluation context.
* </blockquote>
*
* @author bob mcwhirter (bob @ werken.com)
* @see <a href="https://www.w3.org/TR/xpath#function-last" target="_top">Section 4.1 of the XPath Specification</a>
*/
public class LastFunction implements Function
{
/**
* Create a new <code>LastFunction</code> object.
*/
public LastFunction() {}
/**
* Returns the number of nodes in the context node-set.
*
* @param context the context at the point in the
* expression where the function is called
* @param args an empty list
*
* @return a <code>Double</code> containing the context size
*
* @throws FunctionCallException if <code>args</code> is not empty
*
* @see Context#getSize()
*/
public Object call(Context context,
List args) throws FunctionCallException
{
if (args.size() == 0)
{
return evaluate( context );
}
throw new FunctionCallException( "last() requires no arguments." );
}
/**
* Returns the number of nodes in the context node-set.
*
* @param context the context at the point in the
* expression where the function is called
*
* @return the context size
*
* @see Context#getSize()
*/
public static Double evaluate(Context context)
{
return Double.valueOf( context.getSize() );
}
}