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  2 martin 1.16 //

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  4             // agreements.  Refer to the OpenPegasusNOTICE.txt file distributed with
  5             // this work for additional information regarding copyright ownership.
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  9 martin 1.16 //

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 28 martin 1.15 //////////////////////////////////////////////////////////////////////////

 29 mike   1.2  //
 30             //%/////////////////////////////////////////////////////////////////////////////
 31             
 32             #ifndef Pegasus_WQLOperand_h
 33             #define Pegasus_WQLOperand_h
 34             

 35 kumpf  1.3  #include <new>

 36 mike   1.2  #include <Pegasus/Common/Config.h>
 37             #include <Pegasus/Common/String.h>

 38 kumpf  1.5  #include <Pegasus/Common/InternalException.h>

 39 mike   1.2  #include <Pegasus/WQL/Linkage.h>
 40             
 41             PEGASUS_NAMESPACE_BEGIN
 42             
 43             /** Tag used to force invocation of the integer value form of the WQLOperand
 44                 Constructor.
 45             */

 46 kumpf  1.17 enum WQLIntegerValueTag
 47             {
 48                 WQL_INTEGER_VALUE_TAG

 49 mike   1.2  };
 50             
 51             /** Tag used to force invocation of the double value form of the WQLOperand
 52                 Constructor.
 53             */

 54 kumpf  1.17 enum WQLDoubleValueTag
 55             {
 56                 WQL_DOUBLE_VALUE_TAG

 57 mike   1.2  };
 58             
 59             /** Tag used to force invocation of the boolean value form of the WQLOperand
 60                 Constructor.
 61             */

 62 kumpf  1.17 enum WQLBooleanValueTag
 63             {
 64                 WQL_BOOLEAN_VALUE_TAG

 65 mike   1.2  };
 66             
 67             /** Tag used to force invocation of the string value form of the WQLOperand
 68                 Constructor.
 69             */

 70 kumpf  1.17 enum WQLStringValueTag
 71             {
 72                 WQL_STRING_VALUE_TAG

 73 mike   1.2  };
 74             
 75             /** Tag used to force invocation of the property name form of the WQLOperand
 76                 Constructor.
 77             */

 78 kumpf  1.17 enum WQLPropertyNameTag
 79             {
 80                 WQL_PROPERTY_NAME_TAG

 81 mike   1.2  };
 82             
 83             /** Used to represent SQL where clause operands.
 84             
 85                 Instances of WQLOperand are used to represent the operands of the
 86                 SQL where clause. Instances of this class are created while parsing
 87                 a SQL where clause and added to the WQLSelectStatement by calling the
 88                 WQLSelectStatement::appendOperand() method. Consider the following
 89                 example:
 90             
 91                 <pre>

 92 karl   1.13        SELECT ratio, size, name, str
 93                    FROM MyClass
 94                     WHERE ratio > 1.4 AND size = 3 AND name = "Hello" AND str IS NULL

 95 mike   1.2      </pre>
 96             
 97                 In this example, the following are operands:
 98             
 99                 <pre>

100 karl   1.13         ratio
101                     1.4
102                     size
103                     3
104                     name
105                     "Hello"
106                     str

107 mike   1.2      </pre>
108             
109                 Operands are of one of the following types:
110             
111                 <ul>

112 karl   1.13     <li>NULL_VALUE - contains a null value of any type</li>
113                 <li>INTEGER_VALUE - an integer literal (e.g., 10, -22)</li>
114                 <li>DOUBLE_VALUE - a double literal (e.g., 1.4, 1.375e-5)</li>
115                 <li>BOOLEAN_VALUE - a boolean literal (e.g., TRUE or FALSE)</li>
116                 <li>STRING_VALUE - a string literal (e.g., "Hello World")</li>
117                 <li>PROPERTY_NAME- the name of a property (e.g., count, size)</li>

118 mike   1.2      </ul>
119             */
120             class PEGASUS_WQL_LINKAGE WQLOperand
121             {
122             public:
123             
124                 /** Defines allowed types of WQL operands (NULL_VALUE, INTEGER_VALUE,

125 karl   1.13     DOUBLE_VALUE, BOOLEAN_VALUE, STRING_VALUE, PROPERTY_NAME).

126 mike   1.2      */
127                 enum Type
128                 {

129 karl   1.13         NULL_VALUE,
130                     INTEGER_VALUE,
131                     DOUBLE_VALUE,
132                     BOOLEAN_VALUE,
133                     STRING_VALUE,
134                     PROPERTY_NAME

135 mike   1.2      };
136             
137                 /** Desfault constructor. Initializes to null value.
138                 */
139                 WQLOperand();
140             
141                 /** Copy constructor.
142                 */
143                 WQLOperand(const WQLOperand& x);
144             
145                 /** Initializes object as INTEGER_VALUE.
146                 */

147 kumpf  1.8      WQLOperand(Sint64 x, WQLIntegerValueTag)

148 mike   1.2      {

149 karl   1.13         _integerValue = x;
150                     _type = INTEGER_VALUE;

151 mike   1.2      }
152             
153                 /** Initializes object as DOUBLE_VALUE.
154                 */
155                 WQLOperand(Real64 x, WQLDoubleValueTag)
156                 {

157 karl   1.13         _doubleValue = x;
158                     _type = DOUBLE_VALUE;

159 mike   1.2      }
160             
161                 /** Initializes object as BOOLEAN_VALUE.
162                 */
163                 WQLOperand(Boolean x, WQLBooleanValueTag)
164                 {

165 karl   1.13         _booleanValue = x;
166                     _type = BOOLEAN_VALUE;

167 mike   1.2      }
168             
169                 /** Initializes object as STRING_VALUE.
170                 */
171                 WQLOperand(const String& x, WQLStringValueTag)
172                 {

173 karl   1.13         new(_stringValue) String(x);
174                     _type = STRING_VALUE;

175 mike   1.2      }
176             
177                 /** Initializes object as PROPERTY_NAME.
178                 */
179                 WQLOperand(const String& x, WQLPropertyNameTag)
180                 {

181 karl   1.13         new(_propertyName) String(x);
182                     _type = PROPERTY_NAME;

183 mike   1.2      }
184             

185 kumpf  1.17     /** Destructor.

186 mike   1.2      */
187                 ~WQLOperand();
188             
189                 /** Assignment operator.
190                 */
191                 WQLOperand& operator=(const WQLOperand& x);
192             
193                 /** Clears this object and sets its type to NULL_VALUE.
194                 */
195                 void clear();
196             
197                 /** Assigns object from the given operand.
198                 */
199                 void assign(const WQLOperand& x);
200             
201                 /** Accessor for getting the type of the operand.
202                 */
203                 Type getType() const { return _type; }
204             
205                 /** Sets this object to an INTEGER_VALUE.
206                 */

207 kumpf  1.8      void setIntegerValue(Sint64 x)

208 mike   1.2      {

209 karl   1.13         clear();
210                     _integerValue = x;
211                     _type = INTEGER_VALUE;

212 mike   1.2      }
213             
214                 /** Sets this object to an DOUBLE_VALUE.
215                 */
216                 void setDoubleValue(Real64 x)
217                 {

218 karl   1.13         clear();
219                     _doubleValue = x;
220                     _type = DOUBLE_VALUE;

221 mike   1.2      }
222             
223                 /** Sets this object to a BOOLEAN_VALUE.
224                 */
225                 void setBooleanValue(Boolean x)
226                 {

227 karl   1.13         clear();
228                     _booleanValue = x;
229                     _type = BOOLEAN_VALUE;

230 mike   1.2      }
231             
232                 /** Sets this object to a STRING_VALUE.
233                 */
234                 void setStringValue(const String& x)
235                 {

236 karl   1.13         clear();
237                     new(_stringValue) String(x);
238                     _type = STRING_VALUE;

239 mike   1.2      }
240             
241                 /** Sets this object to a PROPERTY_NAME.
242                 */
243                 void setPropertyName(const String& x)
244                 {

245 karl   1.13         clear();
246                     new(_propertyName) String(x);
247                     _type = PROPERTY_NAME;

248 mike   1.2      }
249             
250                 /** Gets this object as an INTEGER_VALUE.
251                 */

252 kumpf  1.8      Sint64 getIntegerValue() const

253 mike   1.2      {

254 karl   1.13         if (_type != INTEGER_VALUE)
255                         throw TypeMismatchException();

256 kumpf  1.17 

257 karl   1.13         return _integerValue;

258 mike   1.2      }
259             
260                 /** Gets this object as an DOUBLE_VALUE.

261 karl   1.13     @exception TypeMismatchException is not the expected type.

262 mike   1.2      */

263 kumpf  1.8      Real64 getDoubleValue() const

264 mike   1.2      {

265 karl   1.13         if (_type != DOUBLE_VALUE)
266                         throw TypeMismatchException();

267 kumpf  1.17 

268 karl   1.13         return _doubleValue;

269 mike   1.2      }
270             
271                 /** Gets this object as an BOOLEAN_VALUE.

272 karl   1.13     @exception TypeMismatchException is not the expected type.

273 mike   1.2      */
274                 Boolean getBooleanValue() const
275                 {

276 karl   1.13         if (_type != BOOLEAN_VALUE)
277                         throw TypeMismatchException();

278 kumpf  1.17 

279 karl   1.13         return _booleanValue;

280 mike   1.2      }
281             
282                 /** Gets this object as a STRING_VALUE.

283 karl   1.13     @exception TypeMismatchException is not the expected type.

284 mike   1.2      */
285                 const String& getStringValue() const
286                 {

287 karl   1.13         if (_type != STRING_VALUE)
288                         throw TypeMismatchException();

289 kumpf  1.17 

290 karl   1.13         return *((String*)_stringValue);

291 mike   1.2      }
292             
293                 /** Gets this object as a PROPERTY_NAME.

294 karl   1.13     @exception TypeMismatchException is not the expected type.

295 mike   1.2      */
296                 const String& getPropertyName() const
297                 {

298 karl   1.13         if (_type != PROPERTY_NAME)
299                         throw TypeMismatchException();

300 kumpf  1.17 

301 karl   1.13         return *((String*)_propertyName);

302 mike   1.2      }
303             
304                 /** Converts this object to a string for output purposes.
305                 */
306                 String toString() const;
307             
308             private:
309             
310                 union
311                 {

312 karl   1.13         Sint64 _integerValue;
313                     Real64 _doubleValue;
314                     Boolean _booleanValue;
315                     char _stringValue[sizeof(String)];
316                     char _propertyName[sizeof(String)];

317 mike   1.2      };
318             
319                 Type _type;
320             };
321             
322             PEGASUS_NAMESPACE_END
323             
324             #endif /* Pegasus_WQLOperand_h */