/*
* @(#)LazyActionMap.java 1.5 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.swing.plaf.basic;
import java.lang.reflect.*;
import javax.swing.*;
import javax.swing.plaf.*;
/**
* An ActionMap that populates its contents as necessary. The
* contents are populated by invoking the loadActionMap
* method on the passed in Object.
*
* @version 1.5, 12/19/03
* @author Scott Violet
*/
class LazyActionMap extends ActionMapUIResource {
/**
* Object to invoke loadActionMap
on. This may be
* a Class object.
*/
private transient Object _loader;
/**
* Installs an ActionMap that will be populated by invoking the
* loadActionMap
method on the specified Class
* when necessary.
*
* This should be used if the ActionMap can be shared.
*
* @param c JComponent to install the ActionMap on.
* @param loaderClass Class object that gets loadActionMap invoked
* on.
* @param defaultsKey Key to use to defaults table to check for
* existing map and what resulting Map will be registered on.
*/
static void installLazyActionMap(JComponent c, Class loaderClass,
String defaultsKey) {
ActionMap map = (ActionMap)UIManager.get(defaultsKey);
if (map == null) {
map = new LazyActionMap(loaderClass);
UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
}
SwingUtilities.replaceUIActionMap(c, map);
}
/**
* Returns an ActionMap that will be populated by invoking the
* loadActionMap
method on the specified Class
* when necessary.
*
* This should be used if the ActionMap can be shared. * * @param c JComponent to install the ActionMap on. * @param loaderClass Class object that gets loadActionMap invoked * on. * @param defaultsKey Key to use to defaults table to check for * existing map and what resulting Map will be registered on. */ static ActionMap getActionMap(Class loaderClass, String defaultsKey) { ActionMap map = (ActionMap)UIManager.get(defaultsKey); if (map == null) { map = new LazyActionMap(loaderClass); UIManager.getLookAndFeelDefaults().put(defaultsKey, map); } return map; } private LazyActionMap(Class loader) { _loader = loader; } public void put(Action action) { put(action.getValue(Action.NAME), action); } public void put(Object key, Action action) { loadIfNecessary(); super.put(key, action); } public Action get(Object key) { loadIfNecessary(); return super.get(key); } public void remove(Object key) { loadIfNecessary(); super.remove(key); } public void clear() { loadIfNecessary(); super.clear(); } public Object[] keys() { loadIfNecessary(); return super.keys(); } public int size() { loadIfNecessary(); return super.size(); } public Object[] allKeys() { loadIfNecessary(); return super.allKeys(); } public void setParent(ActionMap map) { loadIfNecessary(); super.setParent(map); } private void loadIfNecessary() { if (_loader != null) { Object loader = _loader; _loader = null; Class klass = (Class)loader; try { Method method = klass.getDeclaredMethod("loadActionMap", new Class[] { LazyActionMap.class }); method.invoke(klass, new Object[] { this }); } catch (NoSuchMethodException nsme) { assert false : "LazyActionMap unable to load actions " + klass; } catch (IllegalAccessException iae) { assert false : "LazyActionMap unable to load actions " + iae; } catch (InvocationTargetException ite) { assert false : "LazyActionMap unable to load actions " + ite; } catch (IllegalArgumentException iae) { assert false : "LazyActionMap unable to load actions " + iae; } } } }