org.cpsolver.exam.criteria

## Class InstructorBackToBackConflicts

- java.lang.Object
- - org.cpsolver.ifs.criteria.AbstractCriterion<Exam,ExamPlacement>
  - - org.cpsolver.exam.criteria.ExamCriterion
    - - org.cpsolver.exam.criteria.StudentBackToBackConflicts
      - - org.cpsolver.exam.criteria.InstructorBackToBackConflicts

- All Implemented Interfaces:
    CanHoldContext, HasAssignmentContext<Exam,ExamPlacement,AbstractCriterion.ValueContext>, Criterion<Exam,ExamPlacement>, ExtendedInfoProvider<Exam,ExamPlacement>, InfoProvider<Exam,ExamPlacement>, ModelListener<Exam,ExamPlacement>

      public class InstructorBackToBackConflicts
      extends StudentBackToBackConflicts

  Number of back-to-back instructor conflicts. I.e., number of cases when an exam is attended by an instructor that attends some other exam at the previous `ExamPeriod.prev()` or following `ExamPeriod.next()` period. If `StudentBackToBackConflicts.isDayBreakBackToBack()` is false, back-to-back conflicts are only considered between consecutive periods that are of the same day.
  Back-to-back instructor conflict weight can be set by problem property Exams.InstructorBackToBackConflictWeight, or in the input xml file, property instructorBackToBackConflictWeight.
  Version:
    ExamTT 1.3 (Examination Timetabling)
    Copyright (C) 2008 - 2014 Tomáš Müller
    muller@unitime.org
    http://muller.unitime.org
    This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
    This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
    You should have received a copy of the GNU Lesser General Public License along with this library; if not see http://www.gnu.org/licenses/.
  Author:
    Tomáš Müller

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.cpsolver.ifs.criteria.AbstractCriterion

      `AbstractCriterion.ValueContext, AbstractCriterion.ValueUpdateType`

  - ### Field Summary

    - ### Fields inherited from class org.cpsolver.ifs.criteria.AbstractCriterion

      `iBest, iDebug, iWeight, sDoubleFormat, sPercentFormat`

    - ### Fields inherited from interface org.cpsolver.ifs.assignment.context.CanHoldContext

      `sMaxSize`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `InstructorBackToBackConflicts()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getName()` Criterion name
    `double` | `getValue(Assignment<Exam,ExamPlacement> assignment, ExamPlacement value, Set<ExamPlacement> conflicts)` Value of a proposed assignment (including hard conflicts)
    `double` | `getWeightDefault(DataProperties config)` Defines default weight (when `AbstractCriterion.getWeightName()` parameter is not present in the criterion).
    `String` | `getWeightName()` Defines weight name (to be used to get the criterion weight from the configuration).
    `String` | `getXmlWeightName()` Name of the weight parameter in the parameters section of the examination XML file.
    `String` | `toString(Assignment<Exam,ExamPlacement> assignment)` Simple text representation of the criterion and its value.

    - ### Methods inherited from class org.cpsolver.exam.criteria.StudentBackToBackConflicts

      `configure, getInfo, getValue, getXmlParameters, isDayBreakBackToBack, setDayBreakBackToBack, setXmlParameters`

    - ### Methods inherited from class org.cpsolver.exam.criteria.ExamCriterion

      `getBounds, getPeriodValue, getRoomValue, isPeriodCriterion, isRoomCriterion, setWeight`

    - ### Methods inherited from class org.cpsolver.ifs.criteria.AbstractCriterion

      `afterAssigned, afterUnassigned, beforeAssigned, beforeUnassigned, bestRestored, bestSaved, clearCache, computeBounds, constraintAdded, constraintRemoved, createAssignmentContext, getAbbreviation, getAssignmentContextReference, getBest, getBounds, getBounds, getBounds, getContext, getContext, getExtendedInfo, getInfo, getModel, getPerc, getPercentage, getPercRev, getValue, getValue, getValue, getValueUpdateType, getWeight, getWeightedBest, getWeightedValue, getWeightedValue, getWeightedValue, getWeightedValue, getWeightedValue, getWeightedValue, inc, inc, init, setAssignmentContextReference, setModel, setValueUpdateType, variableAdded, variableRemoved`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### InstructorBackToBackConflicts

          public InstructorBackToBackConflicts()

  - ### Method Detail

    - #### getWeightName

          public String getWeightName()

      Description copied from class: `AbstractCriterion`
      Defines weight name (to be used to get the criterion weight from the configuration).
      Overrides:
        `getWeightName` in class `StudentBackToBackConflicts`
      Returns:
        name of the weight associated with this criterion

    - #### getXmlWeightName

          public String getXmlWeightName()

      Description copied from class: `ExamCriterion`
      Name of the weight parameter in the parameters section of the examination XML file.
      Overrides:
        `getXmlWeightName` in class `StudentBackToBackConflicts`
      Returns:
        name of the weight parameter in the XML

    - #### getWeightDefault

          public double getWeightDefault(DataProperties config)

      Description copied from class: `AbstractCriterion`
      Defines default weight (when `AbstractCriterion.getWeightName()` parameter is not present in the criterion).
      Overrides:
        `getWeightDefault` in class `StudentBackToBackConflicts`
      Parameters:
        `config` - solver configuration
      Returns:
        default criterion weight value

    - #### getValue

          public double getValue(Assignment<Exam,ExamPlacement> assignment,
                                 ExamPlacement value,
                                 Set<ExamPlacement> conflicts)

      Description copied from interface: `Criterion`
      Value of a proposed assignment (including hard conflicts)
      Specified by:
        `getValue` in interface `Criterion<Exam,ExamPlacement>`
      Overrides:
        `getValue` in class `StudentBackToBackConflicts`
      Parameters:
        `assignment` - current assignment
        `value` - given value
        `conflicts` - values conflicting with the given value
      Returns:
        change in this criterion value when assigned

    - #### getName

          public String getName()

      Description copied from interface: `Criterion`
      Criterion name
      Specified by:
        `getName` in interface `Criterion<Exam,ExamPlacement>`
      Overrides:
        `getName` in class `StudentBackToBackConflicts`
      Returns:
        name

    - #### toString

          public String toString(Assignment<Exam,ExamPlacement> assignment)

      Description copied from class: `AbstractCriterion`
      Simple text representation of the criterion and its value. E.g., X:x where X is the `AbstractCriterion.getAbbreviation()` and x is the current value `AbstractCriterion.getValue(Assignment)`.
      Specified by:
        `toString` in interface `Criterion<Exam,ExamPlacement>`
      Overrides:
        `toString` in class `StudentBackToBackConflicts`
      Parameters:
        `assignment` - current assignment
      Returns:
        short string representation (e.g., PP:95% for period preference)