Package org.optaplanner.examples.nqueens.domain

Examples of org.optaplanner.examples.nqueens.domain.NQueens

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public class CheatingNQueensPhaseCommand implements CustomPhaseCommand {

    protected final transient Logger logger = LoggerFactory.getLogger(getClass());

    public void changeWorkingSolution(ScoreDirector scoreDirector) {
        NQueens nQueens = (NQueens) scoreDirector.getWorkingSolution();
        int n = nQueens.getN();
        List<Queen> queenList = nQueens.getQueenList();
        List<Row> rowList = nQueens.getRowList();

        if (n % 2 == 1) {
            Queen a = queenList.get(n - 1);
            scoreDirector.beforeVariableChanged(a, "row");
            a.setRow(rowList.get(n - 1));
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    }

    public void resetPanel(Solution solution) {
        removeAll();
        repaint(); // When GridLayout doesn't fill up all the space
        NQueens nQueens = (NQueens) solution;
        int n = nQueens.getN();
        if (n > 100) {
            JLabel tooBigToShowLabel = new JLabel("The dataset is too big to show.");
            tooBigToShowLabel.setForeground(Color.WHITE);
            add(tooBigToShowLabel);
            return;
        }
        List<Queen> queenList = nQueens.getQueenList();
        setLayout(new GridLayout(n, n));
        for (int row = 0; row < n; row++) {
            for (int column = 0; column < n; column++) {
                Queen queen = queenList.get(column);
                if (queen.getColumn().getIndex() != column) {
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        SolverFactory solverFactory = SolverFactory.createFromXmlResource(
                "org/optaplanner/examples/nqueens/solver/nqueensSolverConfig.xml");
        Solver solver = solverFactory.buildSolver();

        // Load a problem with 8 queens
        NQueens unsolved8Queens = new NQueensGenerator().createNQueens(8);

        // Solve the problem
        solver.solve(unsolved8Queens);
        NQueens solved8Queens = (NQueens) solver.getBestSolution();

        // Display the result
        System.out.println("\nSolved 8 queens:\n" + toDisplayString(solved8Queens));
    }
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    }

    private void writeNQueens(int n) {
        String outputFileName = n + "queens.xml";
        File outputFile = new File(outputDir, outputFileName);
        NQueens nQueens = createNQueens(n);
        solutionDao.writeSolution(nQueens, outputFile);
    }
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        NQueens nQueens = createNQueens(n);
        solutionDao.writeSolution(nQueens, outputFile);
    }

    public NQueens createNQueens(int n) {
        NQueens nQueens = new NQueens();
        nQueens.setId(0L);
        nQueens.setN(n);
        nQueens.setColumnList(createColumnList(nQueens));
        nQueens.setRowList(createRowList(nQueens));
        nQueens.setQueenList(createQueenList(nQueens));
        BigInteger possibleSolutionSize = BigInteger.valueOf(nQueens.getN()).pow(nQueens.getN());
        logger.info("NQueens {} has {} queens with a search space of {}.",
                n, nQueens.getN(),
                AbstractSolutionImporter.getFlooredPossibleSolutionSize(possibleSolutionSize));
        return nQueens;
    }
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Related Classes of org.optaplanner.examples.nqueens.domain.NQueens

  • org.optaplanner.examples.nqueens.app.NQueensHelloWorld
  • org.optaplanner.examples.nqueens.persistence.NQueensGenerator
  • org.optaplanner.examples.nqueens.solver.solution.CheatingNQueensPhaseCommand
  • org.optaplanner.examples.nqueens.swingui.NQueensPanel
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