org.jsoar.debugger.selection.SelectionManager Maven / Gradle / Ivy

/*
 * Copyright (c) 2008  Dave Ray 
 *
 * Created on Oct 23, 2008
 */
package org.jsoar.debugger.selection;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * @author ray
 */
public class SelectionManager
{
    private static final SelectionProvider NULL_PROVIDER = new NullProvider();
    
    private List listeners = new CopyOnWriteArrayList();
    private SelectionProvider provider = NULL_PROVIDER;
    
    public void addListener(SelectionListener listener)
    {
        listeners.add(listener);
    }
    
    public void removeListener(SelectionListener listener)
    {
        listeners.remove(listener);
    }
    
    public void setSelectionProvider(SelectionProvider provider)
    {
        this.provider.deactivate();
        this.provider = provider != null ? provider : NULL_PROVIDER;
        this.provider.activate(this);
        fireSelectionChanged();
    }

    /**
     * 
     */
    public void fireSelectionChanged()
    {
        for(SelectionListener listener : listeners)
        {
            listener.selectionChanged(this);
        }
    }
    
    public Object getSelectedObject()
    {
        return provider.getSelectedObject();
    }

    public List