001/*
002 * Copyright (c) 2005 Einar Pehrson, Malin Johansson and Sofia Nilsson
003 *
004 * This file is part of
005 * CleanSheets Extension for Dependency Trees
006 *
007 * CleanSheets Extension for Dependency Trees is free software; you can
008 * redistribute it and/or modify it under the terms of the GNU General Public
009 * License as published by the Free Software Foundation; either version 2 of
010 * the License, or (at your option) any later version.
011 *
012 * CleanSheets Extension for Dependency Trees is distributed in the hope that
013 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
014 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
015 * See the GNU General Public License for more details.
016 *
017 * You should have received a copy of the GNU General Public License
018 * along with CleanSheets Extension for Dependency Trees; if not, write to the
019 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA  02111-1307  USA
021 */
022package csheets.ext.deptree;
023
024import java.util.SortedSet;
025import java.util.TreeSet;
026
027import javax.swing.tree.DefaultTreeModel;
028
029import csheets.core.Cell;
030import csheets.core.formula.Reference;
031import csheets.core.formula.lang.CellReference;
032import csheets.ui.ctrl.UIController;
033
034/**
035 * A tree node for a cell, to which the cell's precedents are added dynamically
036 * when the node is expanded.
037 * @author Einar Pehrson
038 */
039@SuppressWarnings("serial")
040public class PrecedentsNode extends CellNode {
041
042        /** The references of the node's cell. */
043        private SortedSet<Reference> references = new TreeSet<Reference>();
044
045        /** The user interface controller */
046        private UIController uiController;
047
048        /**
049         * Creates a new precedents node.
050         * @param cell the cell of the node
051         * @param treeModel the data model to which the node belongs
052         * @param uiController the user interface controller
053         */
054        public PrecedentsNode(Cell cell, DefaultTreeModel treeModel,
055                        UIController uiController) {
056                super(cell, treeModel);
057                this.uiController = uiController;
058                if (cell.getFormula() != null)
059                        references = cell.getFormula().getReferences();
060        }
061
062        protected void addChildren() {
063                for (Reference reference : references) {
064                        if (reference instanceof CellReference) {
065                                Cell cell = ((CellReference)reference).getCell();
066                                add(new PrecedentsNode(cell, treeModel, uiController));
067                        } else
068                                add(new ReferenceNode(reference, getCell().getSpreadsheet(),
069                                        treeModel, uiController));
070                }
071        }
072
073        /**
074         * Returns whether the cell has references.
075         * @return true if the cell has references
076         */
077        public boolean isLeaf() {
078                return references.isEmpty();
079        }
080}