org.noos.xing.yasaf.plaf.view.MapViewContext Maven / Gradle / Ivy

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MyDoggy-Examples contains some examples to see MyDoggy in action.

There is a newer version: 1.6.0

package org.noos.xing.yasaf.plaf.view;

import org.noos.xing.yasaf.view.ViewContext;
import org.noos.xing.yasaf.view.ViewContextChangeListener;
import org.noos.xing.yasaf.view.event.ViewContextChangeEvent;

import javax.swing.event.EventListenerList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

/**
 * @author Angelo De Caro ([email protected])
 */
public class MapViewContext implements ViewContext {
    protected Map context;

    protected Map listeners;

    public MapViewContext() {
        this.context = new HashMap();
        this.listeners = new Hashtable();
        listeners.put(MapViewContext.class, new EventListenerList());
    }

    public Object get(Object key) {
        return context.get(key);
    }

    public  T get(Class key) {
        return (T) context.get(key);
    }

    public Object put(Object key, Object value) {
        Object old = context.put(key, value);
        firePutEvent(key, old, value);
        return old;
    }

    public void addViewContextChangeListener(Object key, ViewContextChangeListener listener) {
        EventListenerList listenerList = listeners.get(key);
        if (listenerList == null) {
            listenerList = new EventListenerList();
            listeners.put(key, listenerList);
        }
        listenerList.add(ViewContextChangeListener.class, listener);
    }

    public void addViewContextChangeListener(ViewContextChangeListener listener) {
        addViewContextChangeListener(MapViewContext.class, listener);
    }

    protected void firePutEvent(Object key, Object oldValue, Object newValue) {
        EventListenerList unrestricted = listeners.get(MapViewContext.class);
        EventListenerList restricted = listeners.get(key);

        ViewContextChangeEvent event = new ViewContextChangeEvent(this, this, key, oldValue, newValue);

        ViewContextChangeListener[] changeListeners = unrestricted.getListeners(ViewContextChangeListener.class);
        for (ViewContextChangeListener changeListener : changeListeners) {
            changeListener.contextChange(event);
        }

        if (restricted != null) {
            changeListeners = restricted.getListeners(ViewContextChangeListener.class);
            for (ViewContextChangeListener changeListener : changeListeners) {
                changeListener.contextChange(event);
            }
        }
    }
}