JTriggerParametersSupportkit.hh

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#ifndef __JSUPPORT__JTRIGGERPARAMETERSSUPPORTKIT__
#define __JSUPPORT__JTRIGGERPARAMETERSSUPPORTKIT__

#include "JTrigger/JTriggerParameters.hh"
#include "JLang/JAbstractObjectIterator.hh"
#include "JLang/JException.hh"
#include "JSupport/JMultipleFileScanner.hh"


/**
 * \author mdejong
 */

namespace JSUPPORT {}
namespace JPP { using namespace JSUPPORT; }

namespace JSUPPORT {

  using JTRIGGER::JTriggerParameters;
  using JLANG::JRewindableAbstractObjectIterator;
  using JLANG::JException;
  using JLANG::JNullPointerException;


  /**
   * Template specialisation of JMultipleFileScanner for trigger parameters.
   *
   * This class re-implements the methods rewind and setObject of the JLANG::JRewindableAbstractObjectIterator interface
   * so that all trigger parameter objects in the complete file list are read and checked for consistency.
   */
  template<>
  class JMultipleFileScanner<JTriggerParameters> :
    public virtual JMultipleFileScanner<>,
    public virtual JRewindableAbstractObjectIterator<JTriggerParameters>
  {
  public:
    /**
     * Default constructor.
     */
    JMultipleFileScanner() :
      JMultipleFileScanner<>(),
      JRewindableAbstractObjectIterator<JTriggerParameters>(),
      do_next(true)
    {}


    /**
     * Copy constructor.
     * The file list is copied.
     *
     * \param  file_list  JMultipleFileScanner
     */
    JMultipleFileScanner(const JMultipleFileScanner_t& file_list) :
      JMultipleFileScanner<>(),
      JRewindableAbstractObjectIterator<JTriggerParameters>(),
      do_next(true)
    {
      configure(file_list, JLimit());
    }


    /**
     * Rewind.
     */
    virtual void rewind() 
    {
      do_next = true;
    }


    /**
     * Set object.
     *
     * \param  object     reference to object to be set
     * \return            true if set; else false
     */
    virtual bool setObject(JTriggerParameters& object)
    {
      if (do_next) {

        using namespace JLANG;

        object  = JTriggerParameters();
        do_next = false;

        unsigned int count = 0;

        JFileScanner<JTriggerParameters> scanner;

        for (const_iterator i = this->begin(); i != this->end(); ++i) {

          scanner.open(i->c_str());

          if (scanner.hasNext()) {

            const JTriggerParameters* __p = scanner.next();
            
            if      (count == 0)
              object  =  *__p;
            else if (!object.equals(*__p))
              throw JException("JMultipleFileScanner<JTriggerParameters>::setObject(): inconsistent trigger parameters.");

            ++count;
          }
          
          scanner.close();
        }

        return count != 0;

      } else {

        return false;
      }
    }


    /**
     * Get trigger parameters.
     *
     * \return            trigger parameters
     */
    const JTriggerParameters& getTriggerParameters()
    {
      const JTriggerParameters* p = NULL;

      if (!this->hasNext() || (p = this->next()) == NULL) {
        throw JNullPointerException("JMultipleFileScanner<JTriggerParameters>::getTriggerParameters(): Missing trigger parameters.");
      }

      rewind();

      return *p;
    }


  private:
    bool do_next;
  };


  /**
   * Get trigger parameters.
   *
   * \param  file_list  file list
   * \return            trigger parameters
   */
  inline JTriggerParameters getTriggerParameters(const JMultipleFileScanner_t& file_list)
  {
    return JMultipleFileScanner<JTriggerParameters>(file_list).getTriggerParameters();
  }
}

#endif