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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 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 1.1.2.1 //============================================================================== 23 // 24 // Author: Mike Brasher (mbrasher@bmc.com) 25 // 26 // Modified By: 27 // 28 //%///////////////////////////////////////////////////////////////////////////// 29 30 #ifndef Pegasus_WQLSelectStatement_h 31 #define Pegasus_WQLSelectStatement_h 32 33 #include <Pegasus/Common/Config.h> 34 #include <Pegasus/Common/Array.h> 35 #include <Pegasus/Common/String.h> 36 #include <Pegasus/WQL/WQLOperation.h> 37 #include <Pegasus/WQL/WQLOperand.h> | ||
38 mike 1.1.2.2 #include <Pegasus/WQL/WQLPropertySource.h> | ||
39 mike 1.1.2.1 40 PEGASUS_NAMESPACE_BEGIN 41 42 /** This class represents a compiled WBEMSQl1 select statement. 43 44 An instance of WQLSelectStatement is passed to WQLParser::parse() which 45 parses and WBEMSQL1 SELECT statement and initializes the WQLSelectStatement 46 instance. The WBEMSWL1 SELECT statement has the following form: 47 48 <pre> 49 SELECT <property>... 50 FROM <class name> 51 WHERE <where clause> 52 </pre> 53 54 The properties may be obtained with the getProperties() method. 55 The class name may be obtained with getClassName(). The where clause 56 may be evaluated by calling evaluateWhereClause() with the appropriate 57 arguments. If hasWhereClause() returns false, then there is no where 58 clause. 59 60 mike 1.1.2.1 The components of the where clause are stored in two arrays: one for 61 operands and one for operators (these are placed in proper order by the 62 YACC parser). Evaluation is performed using a Boolean stack. See the 63 implementation of evaluateWhereClause() for details. 64 */ 65 class PEGASUS_WQL_LINKAGE WQLSelectStatement 66 { 67 public: 68 69 /** Default constructor. 70 */ 71 WQLSelectStatement(); 72 73 /** Destructor. 74 */ 75 ~WQLSelectStatement(); 76 77 /** Clears all data members of this object. 78 */ 79 void clear(); 80 81 mike 1.1.2.1 /** Accessor. 82 */ 83 const String& getClassName() const 84 { 85 return _className; 86 } 87 88 /** Modifier. This method should not be called by the user (only by the 89 parser). 90 */ 91 void setClassName(const String& className) 92 { 93 _className = className; 94 } 95 96 /** Returns the number of property names which were indicated in the 97 selection list. 98 */ 99 Uint32 getPropertyNameCount() const 100 { 101 return _propertyNames.size(); 102 mike 1.1.2.1 } 103 104 /** Gets the i-th property name in the list. 105 */ 106 const String& getPropertyName(Uint32 i) 107 { 108 return _propertyNames[i]; 109 } 110 111 /** Appends a property name to the property name list. This user should 112 not call this method; it should only be called by the parser. 113 */ 114 void appendPropertyName(const String& x) 115 { 116 _propertyNames.append(x); 117 } 118 119 /** Appends an operation to the operation array. This method should only 120 be called by the parser itself. 121 */ 122 void appendOperation(WQLOperation x) 123 mike 1.1.2.1 { 124 _operations.append(x); 125 } 126 127 /** Appends an operand to the operation array. This method should only 128 be called by the parser itself. 129 */ 130 void appendOperand(const WQLOperand& x) 131 { 132 _operands.append(x); 133 } 134 135 /** Returns true if this class has a where clause. 136 */ 137 Boolean hasWhereClause() const 138 { 139 return _operations.size() != 0; 140 } 141 | ||
142 mike 1.1.2.2 /** Evalautes the where clause using the symbol table to resolve symbols. | ||
143 mike 1.1.2.1 */ | ||
144 mike 1.1.2.2 Boolean evaluateWhereClause(const WQLPropertySource* symbolTable) const; | ||
145 mike 1.1.2.1 146 /** Prints out the members of this class. 147 */ 148 void print() const; 149 150 private: 151 152 // 153 // The name of the target class. For example: 154 // 155 // SELECT * 156 // FROM TargetClass 157 // WHERE ... 158 // 159 160 String _className; 161 162 // 163 // The list of property names being selected. For example, see "firstName", 164 // and "lastName" below. 165 // 166 mike 1.1.2.1 // SELECT firstName, lastName 167 // FROM TargetClass 168 // WHERE ... 169 // 170 171 Array<String> _propertyNames; 172 173 // 174 // The list of operations encountered while parsing the WHERE clause. 175 // Consider this query: 176 // 177 // SELECT * 178 // FROM TargetClass 179 // WHERE count > 10 OR peak < 20 AND state = "OKAY" 180 // 181 // This would generate the following stream of WQLOperations: 182 // 183 // WQL_GT 184 // WQL_LT 185 // WQL_EQ 186 // WQL_AND 187 mike 1.1.2.1 // WQL_OR 188 // 189 190 Array<WQLOperation> _operations; 191 192 // 193 // The list of operands encountered while parsing the WHERE clause. They 194 // query just above would generate the following stream of operands: 195 // 196 // count, 10, peak, 20, state, "OKAY" 197 // 198 199 Array<WQLOperand> _operands; 200 }; 201 202 PEGASUS_NAMESPACE_END 203 204 #endif /* Pegasus_WQLSelectStatement_h */ |
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