java.lang.Object
- org.jacop.search.SimpleSolutionListener<T>

Type Parameters:

T - type of variable being used in search.

All Implemented Interfaces:

SolutionListener<T>

Direct Known Subclasses:

CPvizNetworkFlow.NetListener, CrossWord.PrintListener, OneSolution, Optimize.ResultListener, PrintOutListener, RestartSearch.CostListener, SimpleImprovementSearch.CostListener, Solve.CostListener
```
public class SimpleSolutionListener<T extends Var>
extends java.lang.Object
implements SolutionListener<T>
```
It defines a simple solution listener which should be used if some basic functionality of search when a solution is encountered are required.

Version:

4.8

Field Summary

Fields
Modifier and Type	Field	Description
`(package private) boolean`	`alwaysUpdateToMostRecentSolution`
`SolutionListener<T>[]`	`childrenSolutionListeners`	It contains children of the solution listener.
`private static boolean`	`debug`	It specifies if the debugging information should be printed.
`protected int`	`noSolutions`
`SolutionListener<? extends Var>`	`parentSolutionListener`	If this search is a slave search than each solution within this search must be connected to a solution of the master search.
`int[]`	`parentSolutionNo`	If this search is a slave search than each solution within this search must be connected to a solution of the master search.
`(package private) boolean`	`recordSolutions`
`int`	`solutionLimit`	It specifies the number of solutions we want to find.
`Domain[][]`	`solutions`
`T[]`	`vars`	It is executed right after consistency of the current search node.

Constructor Summary

Constructors
Constructor Description

SimpleSolutionListener()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`assignSolution(Store store)`	It assigns the last found solution to the store.
`boolean`	`assignSolution(Store store, int number)`	It imposes the constraints, so the last found solution is enforced.
`boolean`	`executeAfterSolution(Search<T> search, SelectChoicePoint<T> select)`	It is executed by search after a solution is found.
`int`	`findSolutionMatchingParent(int parentNo)`	For a given master solution finds any solution within that listener which matches the master solution.
`int`	`getParentSolution(int childSolutionNo)`
`Domain[]`	`getSolution(int no)`	It returns the solution number no.
`Domain[][]`	`getSolutions()`	It returns all solutions.
`T[]`	`getVariables()`	It returns null if no solution was recorded, or the variables for which the solution(s) was recorded.
`boolean`	`isRecordingSolutions()`	It specifies if the solution listener is recording solutions or not.
`void`	`printAllSolutions()`	It prints all the solutions.
`void`	`recordSolution()`	It records a solution.
`void`	`recordSolutions(boolean status)`	It records all solutions so they can be later retrieved and used.
`PrimitiveConstraint[]`	`returnSolution()`	It returns a collection of constraints which represent the last found solution.
`PrimitiveConstraint[]`	`returnSolution(int number)`	It returns the solution with the given number (value 0 denotes the first solution) as a set of primitive constraints.
`void`	`searchAll(boolean status)`	It searches for all solutions, but they do not have to be recorded as this is decided by another parameter.
`void`	`setChildrenListeners(SolutionListener<T> child)`	It sets the child listener for this solution listener.
`void`	`setChildrenListeners(SolutionListener<T>[] children)`	It sets the children listeners for this solution listener.
`void`	`setParentSolutionListener(SolutionListener<? extends Var> parent)`	It allows to inform sub-search of what is the current number of the solution in master search.
`void`	`setSolutionLimit(int limit)`	It sets the solution limit.
`void`	`setSolutionsNo(int no)`
`void`	`setVariables(T[] vs)`
`boolean`	`solutionLimitReached()`	It checks if the sufficient number of solutions was found.
`int`	`solutionsNo()`	It returns number of solutions found while using this choice point selector.
`java.lang.String`	`toString()`	It returns the string representation of the last solution.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - debug
```
private static final boolean debug
```
    It specifies if the debugging information should be printed.
    
    See Also:
    
    Constant Field Values
  - vars
```
public T extends Var[] vars
```
    It is executed right after consistency of the current search node. The return code specifies if the search should continue or exit.
  - alwaysUpdateToMostRecentSolution
```
boolean alwaysUpdateToMostRecentSolution
```
  - solutionLimit
```
public int solutionLimit
```
    It specifies the number of solutions we want to find.
  - noSolutions
```
protected int noSolutions
```
  - recordSolutions
```
boolean recordSolutions
```
  - solutions
```
public Domain[][] solutions
```
  - parentSolutionListener
```
public SolutionListener<? extends Var> parentSolutionListener
```
    If this search is a slave search than each solution within this search must be connected to a solution of the master search. The parentSolutionListener is a solution listener of the master search.
  - parentSolutionNo
```
public int[] parentSolutionNo
```
    If this search is a slave search than each solution within this search must be connected to a solution of the master search. This array stores for each solution recorded by this solution listener the solution number of the master slave.
  - childrenSolutionListeners
```
public SolutionListener<T extends Var>[] childrenSolutionListeners
```
    It contains children of the solution listener.
- Constructor Detail
  - SimpleSolutionListener
```
public SimpleSolutionListener()
```
- Method Detail
  - getVariables
```
public T[] getVariables()
```
    It returns null if no solution was recorded, or the variables for which the solution(s) was recorded.
    
    Specified by:
    
    getVariables in interface SolutionListener<T extends Var>
    
    Returns:
    
    list of variables
  - solutionLimitReached
```
public boolean solutionLimitReached()
```
    Description copied from interface: SolutionListener
    
    It checks if the sufficient number of solutions was found.
    
    Specified by:
    
    solutionLimitReached in interface SolutionListener<T extends Var>
    
    Returns:
    
    true if the limit of found solutions has been reached.
  - setSolutionLimit
```
public void setSolutionLimit(int limit)
```
    Description copied from interface: SolutionListener
    
    It sets the solution limit.
    
    Specified by:
    
    setSolutionLimit in interface SolutionListener<T extends Var>
    
    Parameters:
    
    limit - the maximal number of solutions we are interested in.
  - setParentSolutionListener
```
public void setParentSolutionListener(SolutionListener<? extends Var> parent)
```
    Description copied from interface: SolutionListener
    
    It allows to inform sub-search of what is the current number of the solution in master search.
    
    Specified by:
    
    setParentSolutionListener in interface SolutionListener<T extends Var>
    
    Parameters:
    
    parent - solution listener used by a master search.
  - getSolutions
```
public Domain[][] getSolutions()
```
    Description copied from interface: SolutionListener
    
    It returns all solutions. Each solution is in a separate array.
    
    Specified by:
    
    getSolutions in interface SolutionListener<T extends Var>
    
    Returns:
    
    first dimension is indexed by solution, second dimension is indexed by a variable.
  - getSolution
```
public Domain[] getSolution(int no)
```
    It returns the solution number no. The first solution has an index 1.
    
    Specified by:
    
    getSolution in interface SolutionListener<T extends Var>
    
    Parameters:
    
    no - it obtains the solution with a given index.
    
    Returns:
    
    array containing assignments to search variables.
  - solutionsNo
```
public int solutionsNo()
```
    It returns number of solutions found while using this choice point selector.
    
    Specified by:
    
    solutionsNo in interface SolutionListener<T extends Var>
    
    Returns:
    
    the number of solutions.
  - setSolutionsNo
```
public void setSolutionsNo(int no)
```
  - recordSolutions
```
public void recordSolutions(boolean status)
```
    It records all solutions so they can be later retrieved and used.
    
    Specified by:
    
    recordSolutions in interface SolutionListener<T extends Var>
    
    Parameters:
    
    status - true if we are interested in recording all solutions, false otherwise.
  - searchAll
```
public void searchAll(boolean status)
```
    It searches for all solutions, but they do not have to be recorded as this is decided by another parameter.
    
    Specified by:
    
    searchAll in interface SolutionListener<T extends Var>
    
    Parameters:
    
    status - true if we are interested in search for all solutions, false otherwise.
  - recordSolution
```
public void recordSolution()
```
    It records a solution. It uses the current value of the search variables (they must be all grounded) as well as the current number of the solution in master search (if there is one).
  - executeAfterSolution
```
public boolean executeAfterSolution(Search<T> search,
                                    SelectChoicePoint<T> select)
```
    Description copied from interface: SolutionListener
    
    It is executed by search after a solution is found.
    
    Specified by:
    
    executeAfterSolution in interface SolutionListener<T extends Var>
    
    Parameters:
    
    search - the search which have found a solution.
    
    select - the select choice point heuristic
    
    Returns:
    
    false forces the search to keep looking for a solution, true then the search will accept a solution.
  - assignSolution
```
public boolean assignSolution(Store store)
```
    It assigns the last found solution to the store. If the function returns false that means that for some reason the solution which was supposed to be a solution is not. It can be caused by a number of issues, starting with wrongly implemented plugins, wrongly implemented consistency or satisfied function of the constraint.
    
    Parameters:
    
    store - the store in the context of which the search took place.
    
    Returns:
    
    true if the store is consistent after assigning a solution, false otherwise.
  - assignSolution
```
public boolean assignSolution(Store store,
                              int number)
```
    Description copied from interface: SolutionListener
    
    It imposes the constraints, so the last found solution is enforced.
    
    Specified by:
    
    assignSolution in interface SolutionListener<T extends Var>
    
    Parameters:
    
    store - store in which the solution is enforced.
    
    number - the number of the solution to be enforced.
    
    Returns:
    
    true if the store is consistent after enforcing a solution, false otherwise.
  - setVariables
```
public void setVariables(T[] vs)
```
  - toString
```
public java.lang.String toString()
```
    Description copied from interface: SolutionListener
    
    It returns the string representation of the last solution.
    
    Specified by:
    
    toString in interface SolutionListener<T extends Var>
    
    Overrides:
    
    toString in class java.lang.Object
  - returnSolution
```
public PrimitiveConstraint[] returnSolution()
```
    Description copied from interface: SolutionListener
    
    It returns a collection of constraints which represent the last found solution.
    
    Specified by:
    
    returnSolution in interface SolutionListener<T extends Var>
    
    Returns:
    
    the set of constraints which imposed enforce the last found solution.
  - returnSolution
```
public PrimitiveConstraint[] returnSolution(int number)
```
    It returns the solution with the given number (value 0 denotes the first solution) as a set of primitive constraints.
    
    Parameters:
    
    number - the solution number (0 denotes the first solution).
    
    Returns:
    
    set of primitive constraint which if imposed will enforce given solution.
  - findSolutionMatchingParent
```
public int findSolutionMatchingParent(int parentNo)
```
    Description copied from interface: SolutionListener
    
    For a given master solution finds any solution within that listener which matches the master solution.
    
    Specified by:
    
    findSolutionMatchingParent in interface SolutionListener<T extends Var>
    
    Parameters:
    
    parentNo - solution number of the parent for which we search matching solution.
    
    Returns:
    
    -1 if no solution was found, otherwise the index of the solution.
  - setChildrenListeners
```
public void setChildrenListeners(SolutionListener<T>[] children)
```
    Description copied from interface: SolutionListener
    
    It sets the children listeners for this solution listener.
    
    Specified by:
    
    setChildrenListeners in interface SolutionListener<T extends Var>
    
    Parameters:
    
    children - an array containing children listeners.
  - setChildrenListeners
```
public void setChildrenListeners(SolutionListener<T> child)
```
    Description copied from interface: SolutionListener
    
    It sets the child listener for this solution listener.
    
    Specified by:
    
    setChildrenListeners in interface SolutionListener<T extends Var>
    
    Parameters:
    
    child - the child listener.
  - isRecordingSolutions
```
public boolean isRecordingSolutions()
```
    Description copied from interface: SolutionListener
    
    It specifies if the solution listener is recording solutions or not.
    
    Specified by:
    
    isRecordingSolutions in interface SolutionListener<T extends Var>
    
    Returns:
    
    true if all solutions are recorded, false if only the last one is recorded.
  - printAllSolutions
```
public void printAllSolutions()
```
    Description copied from interface: SolutionListener
    
    It prints all the solutions.
    
    Specified by:
    
    printAllSolutions in interface SolutionListener<T extends Var>
  - getParentSolution
```
public int getParentSolution(int childSolutionNo)
```
    Specified by:
    
    getParentSolution in interface SolutionListener<T extends Var>

Class SimpleSolutionListener<T extends Var>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

debug

vars

alwaysUpdateToMostRecentSolution

solutionLimit

noSolutions

recordSolutions

solutions

parentSolutionListener

parentSolutionNo

childrenSolutionListeners

Constructor Detail

SimpleSolutionListener

Method Detail

getVariables

solutionLimitReached

setSolutionLimit

setParentSolutionListener

getSolutions

getSolution

solutionsNo

setSolutionsNo

recordSolutions

searchAll

recordSolution

executeAfterSolution

assignSolution

assignSolution

setVariables

toString

returnSolution

returnSolution

findSolutionMatchingParent

setChildrenListeners

setChildrenListeners

isRecordingSolutions

printAllSolutions

getParentSolution