/*
* Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
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 <code>loadActionMap</code>
* method on the passed in Object.
*
* @author Scott Violet
*/
class LazyActionMap extends ActionMapUIResource {
/**
* Object to invoke <code>loadActionMap</code> on. This may be
* a Class object.
*/
private transient Object _loader;
/**
* Installs an ActionMap that will be populated by invoking the
* <code>loadActionMap</code> method on the specified Class
* when necessary.
* <p>
* 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
* <code>loadActionMap</code> method on the specified Class
* when necessary.
* <p>
* 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;
}
}
}
}