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/* ConjecturingComboBoxModel.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program 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
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.worksheet;
import java.util.ArrayList;
import java.util.List;
import javax.swing.AbstractListModel;
import javax.swing.ComboBoxModel;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
import org.grinvin.conjecture.engine.Engine;
import org.grinvin.invariants.Invariant;
import org.grinvin.list.invariants.InvariantListModel;
import org.grinvin.list.invariants.InvariantListModelListener;
/**
* Combo box model for the conjecturing window. Keeps track of an
* ordered list of invariants, and only shows those that are accepted
* by the associated engine.
*/
public class ConjecturingComboBoxModel extends AbstractListModel
implements ComboBoxModel, InvariantListModelListener {
//
private final Engine engine;
//
private final WorksheetModel worksheetModel;
//
private final InvariantListModel model;
//
private final List<Invariant> list;
public ConjecturingComboBoxModel(Engine engine, WorksheetModel worksheetModel) {
this.engine = engine;
this.worksheetModel = worksheetModel;
this.model = worksheetModel.getInvariantListModel();
this.list = new ArrayList<Invariant> ();
// fill with current contents of model and make sure
// that combobox is synchronised with later updates
rebuild();
setSelectedItem(list.size() > 0 ? list.get(0) : null);
model.addInvariantListModelListener(this);
addListDataListener(new InvariantSelectionListener());
}
public int getSize() {
return list.size();
}
public Invariant getElementAt(int index) {
return list.get(index);
}
//
private Invariant selected;
public Invariant getSelectedItem() {
return selected;
}
public Engine getEngine() {
return engine;
}
/**
* Returns the internal index of the selected item.
* <p><b>Note:<b> This is a slow operation, use of
* {@link #getSelectedItem} is to be preferred
*/
public int getSelectedIndex() {
return indexOf(selected);
}
/**
* Return the index of the given invariant in the internal list.
*/
public int indexOf(Invariant invariant) {
if (invariant == null)
return -1;
int pos = insertPosition(invariant);
if (pos == list.size() || list.get(pos) != invariant)
return -1;
else
return pos;
}
@SuppressWarnings("PMD.CompareObjectsWithEquals")
public void setSelectedItem(Object anItem) {
if (selected == anItem)
return;
Invariant invariant = null;
if (anItem instanceof Invariant) {
invariant = (Invariant)anItem;
if (! engine.allows(invariant)) {
invariant = null;
}
}
if (selected != invariant) {
this.selected = invariant;
fireContentsChanged(this, -1, -1);
}
}
//
private int insertPosition(Invariant invariant) {
String id = invariant.getId();
int pos = list.size() - 1;
while (pos >= 0 && list.get(pos).getId().compareTo(id) >= 0)
pos --;
return pos + 1;
}
/**
* Add an invariant to the combobox. Only adds the invariant when this is
* allowed by the engine.
*/
public void add(Invariant invariant) {
if (engine.allows(invariant)) {
int pos = insertPosition(invariant);
int len = list.size();
list.add(pos, invariant);
fireIntervalAdded(this, pos, len);
}
}
@SuppressWarnings("PMD.CompareObjectsWithEquals")
private void rebuild() {
// rebuild the entire list
list.clear();
for (int i=model.getSize()-1; i >= 0; i--)
add(model.get(i));
// check whether selection still valid
if (selected != null && indexOf(selected) < 0) {
this.selected = null;
fireContentsChanged(this, -1, -1);
}
}
public void intervalRemoved(ListDataEvent e) {
rebuild();
}
public void intervalAdded(ListDataEvent e) {
int from = e.getIndex0();
int upto = e.getIndex1();
for (int i=from; i<= upto; i++)
add(model.get(i));
}
public void contentsChanged(ListDataEvent e) {
rebuild();
}
private class InvariantSelectionListener implements ListDataListener {
public void intervalAdded(ListDataEvent e) {
worksheetModel.fireEngineConfigurationChanged();
}
public void intervalRemoved(ListDataEvent e) {
worksheetModel.fireEngineConfigurationChanged();
}
public void contentsChanged(ListDataEvent e) {
worksheetModel.fireEngineConfigurationChanged();
}
}
}
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