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Java > Open Source Codes > com > icl > saxon > functions > Floor


1 package com.icl.saxon.functions;
2 import com.icl.saxon.*;
3 import com.icl.saxon.expr.*;
4
5 //import java.util.*;
6 import java.lang.Math JavaDoc;
7 //import java.text.*;
8
9
10
11 public class Floor extends Function {
12
13
14     /**
15     * Function name (for diagnostics)
16     */
17
18     public String JavaDoc getName() {
19         return "floor";
20     };
21
22     /**
23     * Determine the data type of the expression
24     * @return Value.NUMBER
25     */
26
27     public int getDataType() {
28         return Value.NUMBER;
29     }
30
31     /**
32     * Simplify and validate.
33     * This is a pure function so it can be simplified in advance if the arguments are known
34     */
35
36     public Expression simplify() throws XPathException {
37         checkArgumentCount(1, 1);
38         argument[0] = argument[0].simplify();
39         if (argument[0] instanceof Value) {
40             return evaluate(null);
41         }
42         return this;
43     }
44
45     /**
46     * Evaluate the function in a numeric context
47     */
48
49     public double evaluateAsNumber(Context c) throws XPathException {
50         return Math.floor(argument[0].evaluateAsNumber(c));
51     }
52
53     /**
54     * Evaluate in a general context
55     */
56
57     public Value evaluate(Context c) throws XPathException {
58         return new NumericValue(evaluateAsNumber(c));
59     }
60
61     /**
62     * Determine the dependencies
63     */
64
65     public int getDependencies() {
66         return argument[0].getDependencies();
67     }
68
69     /**
70     * Reduce the dependencies
71     */
72
73     public Expression reduce(int dep, Context c) throws XPathException {
74         Floor f = new Floor();
75         f.addArgument(argument[0].reduce(dep, c));
76         f.setStaticContext(getStaticContext());
77         return f.simplify();
78     }
79
80 }
81
82
83 //
84 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
85 // you may not use this file except in compliance with the License. You may obtain a copy of the
86 // License at http://www.mozilla.org/MPL/
87 //
88 // Software distributed under the License is distributed on an "AS IS" basis,
89 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
90 // See the License for the specific language governing rights and limitations under the License.
91 //
92 // The Original Code is: all this file.
93 //
94 // The Initial Developer of the Original Code is
95 // Michael Kay of International Computers Limited (mhkay@iclway.co.uk).
96 //
97 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
98 //
99 // Contributor(s): none.
100 //
101
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