TreeBean.java

/**
 *  C-Nery - A home automation web application for C-Bus.
 *  Copyright (C) 2008,2009,2012  Dave Oxley <dave@daveoxley.co.uk>.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.daveoxley.cnery.pages;

import com.daveoxley.cnery.entities.AbstractCondition;
import com.daveoxley.seam.SelectionService;
import com.daveoxley.seam.exceptions.EntityNotFoundException;
import java.util.ArrayList;
import java.util.List;
import org.jboss.seam.Component;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Scope;
import org.richfaces.component.UITree;
import org.richfaces.event.TreeSelectionChangeEvent;

/**
 *
 * @author dave
 */
@Scope(ScopeType.PAGE)
public abstract class TreeBean<E extends AbstractCondition,N extends TreeNode> {

    private N currentSelection = null;

    public void selectionChanged(TreeSelectionChangeEvent selectionChangeEvent) throws EntityNotFoundException {
        // considering only single selection
        List<Object> selection = new ArrayList<Object>(selectionChangeEvent.getNewSelection());

        if (selection.isEmpty()) {
            currentSelection = null;
        }
        else {
            Object currentSelectionKey = selection.get(0);

            UITree tree = (UITree) selectionChangeEvent.getSource();
            Object storedKey = tree.getRowKey();
            tree.setRowKey(currentSelectionKey);
            currentSelection = (N) tree.getRowData();
            tree.setRowKey(storedKey);
        }

        SelectionService ss = (SelectionService)Component.getInstance(getSelectionServiceClass());
        if (currentSelection != null && currentSelection.getEntity() != null)
            ss.setSelectedId(currentSelection.getEntity().getId());
        else
            ss.setSelectedId(null);
    }

    protected abstract Class<? extends SelectionService> getSelectionServiceClass();

    public N getCurrentSelection() { return currentSelection; }

    protected void clearSelection() {
        currentSelection = null;
    }

    public boolean getActionsDisabled() {
        
        return currentSelection == null;
    }

    public boolean getNewActionDisabled() {
        
        return getActionsDisabled();
    }

    public boolean getEditActionDisabled() {
        
        return getActionsDisabled() || currentSelection.getEntity() == null;
    }
}