src/kernel/Cell.java

package kernel;
import kernel.exception.CreateCycleException;
import java.util.ArrayList;
import java.util.List;
public class Cell {
    private String column;
    private Integer line;
    private Double value;
    private Formula formula;
    private List<Cell> usedIn = new ArrayList<>();
    public Cell(String column, Integer line, Double value) {
        this.column = column;
        this.line = line;
        this.setValue(value);
    }
    public Cell(String column, Integer line, Formula formula) throws CreateCycleException {
        this.column = column;
        this.line = line;
        this.setFormula(formula);
    }
    public Double getValue() {
        return this.value;
    }
    public Formula getFormula() {
        return this.formula;
    }
    public String getDevelopedFormula() {
        return this.containFormula() ? this.formula.getDevelopedFormula() : this.getId();
    }
    public String getId() {
        return this.column + this.line.toString();
    }
    public List<Cell> getUsedIn() {
        return this.usedIn;
    }
    public String toString() {
        return this.containFormula() ? this.formula.toString() : this.getId();
    }
    public void updateValue() {
        if (this.containFormula())
            this.value = this.formula.eval();
    }
    public Boolean containFormula() {
        return this.formula != null;
    }
    public void setFormula(Formula formula) throws CreateCycleException {
        if (formula.createCycle(this))
            throw new CreateCycleException();
        else {
            this.formula = formula;
            for (Cell cell : this.formula.getUtilisedCells())
                cell.usedIn.add(this);
            this.updateValue();
            this.spreadValue();
        }
    }
    public void setValue(Double value) {
        this.value = value;
        this.formula = null;
        this.spreadValue();
    }
    private void spreadValue() {
        for (Cell cell : this.usedIn) {
            cell.updateValue();
            cell.spreadValue();
        }
    }
}