1 mike  1.1.2.1 //%/////////////////////////////////////////////////////////////////////////////
 2               //
 3               // Copyright (c) 2000, 2001 BMC Software, Hewlett-Packard Company, IBM, 
 4               // The Open Group, Tivoli Systems
 5               //
 6               // Permission is hereby granted, free of charge, to any person obtaining a copy
 7               // of this software and associated documentation files (the "Software"), to 
 8               // deal in the Software without restriction, including without limitation the 
 9               // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 
10               // sell copies of the Software, and to permit persons to whom the Software is
11               // furnished to do so, subject to the following conditions:
12               // 
13               // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN 
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15               // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
16               // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
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21               //
22 mike  1.1.2.1 //==============================================================================
23               //
24               // Author: Mike Brasher (mbrasher@bmc.com)
25               //
26               // Modified By:
27               //
28               //%/////////////////////////////////////////////////////////////////////////////
29               
30               #ifndef Pegasus_WQLPropertySource_h
31               #define Pegasus_WQLPropertySource_h
32               
33               #include <Pegasus/Common/Config.h>
34               #include <Pegasus/Common/String.h>
35               #include <Pegasus/WQL/Linkage.h>
36               
37               PEGASUS_NAMESPACE_BEGIN
38               
39               /** This class must be implemented to provide a source of properties for the
40                   WQLSelectStatement::evaluateWhereClause() method which calls methods of
41                   this class to obtain real values for property names used in the where
42                   clause.
43 mike  1.1.2.1 
44                   The methods of this class all have the following form:
45               
46                   <pre>
47               	virtual Boolean getValue(
48               	    const String& propertyName, 
49               	    T& value, 
50               	    Boolean& isNull) const = 0;
51                   </pre>
52               
53                   Where "T" is the data type. True is returned if a property with that
54                   name is actually exists and the value refers to the value of that
55                   property. If the property is null, the the isNull flag is passed.
56               */
57               class PEGASUS_WQL_LINKAGE WQLPropertySource
58               {
59               public:
60               
61                   virtual Boolean getValue(
62               	const String& propertyName, 
63               	Sint32& value, 
64 mike  1.1.2.1 	Boolean& isNull) const = 0;
65               
66                   virtual Boolean getValue(
67               	const String& propertyName, 
68               	Real64& x, 
69               	Boolean& isNull) const = 0;
70               
71                   virtual Boolean getValue(
72               	const String& propertyName, 
73               	Boolean& x, 
74               	Boolean& isNull) const = 0;
75               
76                   virtual Boolean getValue(
77               	const String& propertyName, 
78               	String& x, 
79               	Boolean& isNull) const = 0;
80               };
81               
82               PEGASUS_NAMESPACE_END
83               
84               #endif /* Pegasus_WQLPropertySource_h */