SelectionService.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.seam;

import com.daveoxley.seam.exceptions.EntityNotFoundException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Scope;

/**
 *
 * @author Dave Oxley <dave@daveoxley.co.uk>
 */
@Scope(ScopeType.PAGE)
public abstract class SelectionService<T> implements Serializable {

    private Collection<Object> selections = null;

    public Collection<Object> getSelection() {
        return selections;
    }

    public void setSelection(Collection<Object> selections) throws EntityNotFoundException {
        this.selections = selections;
    }

    protected abstract T cast(Object o);

    public T getSelectedId() {
        return (selections == null || !selections.iterator().hasNext()) ? null : cast(selections.iterator().next());
    }

    public void setSelectedId(T selectedId) throws EntityNotFoundException {
        selections = new HashSet<Object>();
        if (selectedId != null)
            selections.add(selectedId);
    }

    public List<T> getSelectedIds() {
        ArrayList<T> selectedIds = new ArrayList<T>();
        if (selections != null) {
            for (Object o : selections)
                selectedIds.add(cast(o));
        }
        return selectedIds;
    }

    public void setSelectedIds(List<T> selectedIds) throws EntityNotFoundException {
        selections = new HashSet<Object>();
        if (selectedIds != null)
            selections.addAll(selectedIds);
    }

    public boolean getActionsDisabled() {
        
        return selections == null || !selections.iterator().hasNext();
    }
}