G(arbage) C(ollected) X(Query) Engine: aggregatefunctsumexpression.h Source File

00001 
00002 /*
00003  | Author: Michael Schmidt;
00004  |         Gunnar Jehl 
00005  |
00006  | ************************* SOFTWARE LICENSE AGREEMENT ***********************
00007  | This source code is published under the BSD License.
00008  |
00009  | See file 'LICENSE.txt' that comes with this distribution or
00010  | http://dbis.informatik.uni-freiburg.de/index.php?project=GCX/license.php
00011  | for the full license agreement.
00012  |
00013  | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00014  | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00015  | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00016  | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00017  | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00018  | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00019  | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00020  | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00021  | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00022  | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00023  | POSSIBILITY OF SUCH DAMAGE.
00024  | ****************************************************************************
00025 */
00026 
00035 #ifndef AGGREGATEFUNCTSUMEXPRESSION_H
00036 #define AGGREGATEFUNCTSUMEXPRESSION_H
00037 
00038 #include "aggregatefunctexpression.h"
00039 
00046 #define OUTPUT_SUM_ON_EMPTY_SEQUENCE 0
00047 
00060 class AggregateFunctSumExpression:public AggregateFunctExpression {
00061 
00062   public:
00067     AggregateFunctSumExpression(VarExpression * _var);
00068 
00073     AggregateFunctSumExpression(VarStepExpression * _varstep);
00074 
00078     virtual ~ AggregateFunctSumExpression();
00079 
00085     virtual void eval(OutputStream & eos, Environment * env, unsigned modus);
00086 
00087   private:
00091      virtual long double calculateValue(OutputStream & eos, Environment * env,
00092                                         unsigned modus, bool & empty_sequence);
00093 };
00094 
00095 #endif // AGGREGATEFUNCTSUMEXPRESSION_H