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File indexing completed on 2025-02-21 10:00:34
0001 /***********************************************************************************\ 0002 * (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations * 0003 * * 0004 * This software is distributed under the terms of the Apache version 2 licence, * 0005 * copied verbatim in the file "LICENSE". * 0006 * * 0007 * In applying this licence, CERN does not waive the privileges and immunities * 0008 * granted to it by virtue of its status as an Intergovernmental Organization * 0009 * or submit itself to any jurisdiction. * 0010 \***********************************************************************************/ 0011 //============================================================================== 0012 // 0013 // Package : Kernel 0014 // 0015 // Author : M.Frank 10/10/00 0016 // 0017 //============================================================================== 0018 #ifndef KERNEL_SELECTSTATEMENT_H 0019 #define KERNEL_SELECTSTATEMENT_H 0020 0021 // STL include files 0022 #include <string> 0023 0024 // Framework include files 0025 #include "GaudiKernel/ISelectStatement.h" 0026 0027 /** Class of a selection statement. 0028 A select statement can either contain 0029 - a string e.g. for refining an SQL statement 0030 - a function object, which will be called back 0031 in order to refine a selection. 0032 This happens in calling sequences like the following: 0033 0034 bool MySelect::operator()(IValueLocator* l) { 0035 float px, py, pz; 0036 if ( l->get("PX",px) && l->get("PY",py) && l->get("PZ",pz) ) { 0037 float mom = sqrt(px*px+py*py+pz*pz); 0038 return mom > 100.0 * GeV; 0039 } 0040 return false; 0041 } 0042 0043 if "true" is returned, the object will be loaded completely. 0044 0045 History: 0046 +---------+----------------------------------------------+--------+ 0047 | Date | Comment | Who | 0048 +---------+----------------------------------------------+--------+ 0049 | 21/10/99| Initial version. | MF | 0050 +---------+----------------------------------------------+--------+ 0051 Author: M.Frank 0052 Version: 1.0 0053 */ 0054 class GAUDI_API SelectStatement : public implements<ISelectStatement> { 0055 public: 0056 /// Standard Constructor initializing select string 0057 explicit SelectStatement( const std::string& s, long typ ) : m_select( s ), m_isActive( false ), m_type( typ ) {} 0058 /// Standard Constructor initializing select string 0059 explicit SelectStatement( const std::string& s ) : m_select( s ), m_isActive( false ), m_type( STRING ) {} 0060 /// Standard Constructor initializing function call 0061 explicit SelectStatement() : m_isActive( false ), m_type( FUNCTION ) {} 0062 /// Standard Destructor 0063 virtual ~SelectStatement() {} 0064 /// Access the type of the object 0065 long type() const override { return m_type; } 0066 /// Access the selection string 0067 const std::string& criteria() const override { return m_select; } 0068 /// Set the type 0069 void setCriteria( const std::string& crit ) override { 0070 m_select = crit; 0071 ( m_select.length() > 0 ) ? m_type |= STRING : m_type &= ~STRING; 0072 } 0073 /// Change activity flag 0074 void setActive( bool flag = true ) override { m_isActive = flag; } 0075 /// Check if selection is active 0076 bool isActive() const override { return m_isActive; } 0077 /// Stupid default implementation 0078 virtual bool operator()( void* /* val */ ) override { return true; } 0079 0080 protected: 0081 /// Select string 0082 std::string m_select; 0083 /// Activation flag 0084 bool m_isActive; 0085 /// Type identifier 0086 long m_type; 0087 }; 0088 #endif // KERNEL_SELECTSTATEMENT_H
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