5 // Chris J Breisch (cjbreisch@altavista.net)
6 // Dennis Hayes (dennish@raytek.com)
8 // (C) 2002 Chris J Breisch
9 // (C) 2004 Joerg Rosenkranz <JoergR@voelcker.com>
12 * Copyright (c) 2002-2003 Mainsoft Corporation.
13 * Copyright (C) 2004 Novell, Inc (http://www.novell.com)
15 * Permission is hereby granted, free of charge, to any person obtaining a
16 * copy of this software and associated documentation files (the "Software"),
17 * to deal in the Software without restriction, including without limitation
18 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
19 * and/or sell copies of the Software, and to permit persons to whom the
20 * Software is furnished to do so, subject to the following conditions:
22 * The above copyright notice and this permission notice shall be included in
23 * all copies or substantial portions of the Software.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
34 using System.Globalization;
35 using System.ComponentModel;
37 namespace Microsoft.VisualBasic.CompilerServices
39 [StandardModule, EditorBrowsableAttribute(EditorBrowsableState.Never)]
40 sealed public class BooleanType {
41 private BooleanType () {}
44 * The method converts given object to boolean by the following logic:
45 * 1. If input object is null - return null
46 * 2. If input object is String - run FromString method
47 * 3. Otherwise run .NET default conversion - Convert.ToBoolean
48 * @param value - The object that going to be converted
49 * @return boolean The boolean value that converted from the source object
51 public static System.Boolean FromObject (object Value) {
56 return FromString((string)Value);
58 //This throws the correct execption, Mainsoft java code has to catch and rethrow to map java to .net
59 return Convert.ToBoolean(Value);
63 * The method try to convert given string to boolean in a following way:
64 * 1. If input value is True or False string - return corresponding value
65 * 2. If input string represents number: return true if this number is not
66 * equals to zero, otherwise return false;
67 * @exception InvalidCastException - in case if number translation failed
68 * due to NumberFormatException.
69 * @exception All other thrown exceptions from ClrDobule.Parse
70 * @param str - The string that converted to boolean
71 * @return boolean The value that extracted from the input string.
73 public static Boolean FromString (string Value) {
77 if (string.Compare(Value, bool.TrueString, true) == 0)
79 if (string.Compare(Value, bool.FalseString, true) == 0)
83 if (double.TryParse(Value, NumberStyles.Any, NumberFormatInfo.InvariantInfo, out conv))
86 throw new InvalidCastException (
88 "Cast from string \"{0}\" to type 'Boolean' is not valid.",