1 mike  1.2 //%/////////////////////////////////////////////////////////////////////////////
 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 
14           // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
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 
17           // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
18           // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
19           // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20           // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21           //
22 mike  1.2 //==============================================================================
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           #include <Pegasus/WQL/WQLOperand.h>
37           
38           PEGASUS_NAMESPACE_BEGIN
39           
40           /** This class must be implemented to provide a source of properties for the
41               WQLSelectStatement::evaluateWhereClause() method which calls methods of
42               this class to obtain real values for property names used in the where
43 mike  1.2     clause.
44           */
45           class PEGASUS_WQL_LINKAGE WQLPropertySource
46           {
47           public:
48           
49               /** Virtual destructor.
50               */
51               virtual ~WQLPropertySource();
52           
53               /** Returns the value whose property has the given name. The output
54           	parameter value is populated with the value of that parameter.
55           	Note that only integer, double, and string types are supported
56           	(see the WQLOperand class). The implementer of this method must
57           	perform appropriate conversions to the appropriate type.
58           
59           	@param propertyName name of property to be gotten.
60           	@param value holds the value of the property upon return.
61           	@return true if such a property was found and false otherwise.
62               */
63               virtual Boolean getValue(
64 mike  1.2 	const String& propertyName, 
65           	WQLOperand& value) const = 0;
66           };
67           
68           PEGASUS_NAMESPACE_END
69           
70           #endif /* Pegasus_WQLPropertySource_h */