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    1   /*
    2    * Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   package javax.swing.plaf.basic;
   26   
   27   import java.lang.reflect;
   28   import javax.swing;
   29   import javax.swing.plaf;
   30   
   31   /**
   32    * An ActionMap that populates its contents as necessary. The
   33    * contents are populated by invoking the <code>loadActionMap</code>
   34    * method on the passed in Object.
   35    *
   36    * @author Scott Violet
   37    */
   38   class LazyActionMap extends ActionMapUIResource {
   39       /**
   40        * Object to invoke <code>loadActionMap</code> on. This may be
   41        * a Class object.
   42        */
   43       private transient Object _loader;
   44   
   45       /**
   46        * Installs an ActionMap that will be populated by invoking the
   47        * <code>loadActionMap</code> method on the specified Class
   48        * when necessary.
   49        * <p>
   50        * This should be used if the ActionMap can be shared.
   51        *
   52        * @param c JComponent to install the ActionMap on.
   53        * @param loaderClass Class object that gets loadActionMap invoked
   54        *                    on.
   55        * @param defaultsKey Key to use to defaults table to check for
   56        *        existing map and what resulting Map will be registered on.
   57        */
   58       static void installLazyActionMap(JComponent c, Class loaderClass,
   59                                        String defaultsKey) {
   60           ActionMap map = (ActionMap)UIManager.get(defaultsKey);
   61           if (map == null) {
   62               map = new LazyActionMap(loaderClass);
   63               UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
   64           }
   65           SwingUtilities.replaceUIActionMap(c, map);
   66       }
   67   
   68       /**
   69        * Returns an ActionMap that will be populated by invoking the
   70        * <code>loadActionMap</code> method on the specified Class
   71        * when necessary.
   72        * <p>
   73        * This should be used if the ActionMap can be shared.
   74        *
   75        * @param c JComponent to install the ActionMap on.
   76        * @param loaderClass Class object that gets loadActionMap invoked
   77        *                    on.
   78        * @param defaultsKey Key to use to defaults table to check for
   79        *        existing map and what resulting Map will be registered on.
   80        */
   81       static ActionMap getActionMap(Class loaderClass,
   82                                     String defaultsKey) {
   83           ActionMap map = (ActionMap)UIManager.get(defaultsKey);
   84           if (map == null) {
   85               map = new LazyActionMap(loaderClass);
   86               UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
   87           }
   88           return map;
   89       }
   90   
   91   
   92       private LazyActionMap(Class loader) {
   93           _loader = loader;
   94       }
   95   
   96       public void put(Action action) {
   97           put(action.getValue(Action.NAME), action);
   98       }
   99   
  100       public void put(Object key, Action action) {
  101           loadIfNecessary();
  102           super.put(key, action);
  103       }
  104   
  105       public Action get(Object key) {
  106           loadIfNecessary();
  107           return super.get(key);
  108       }
  109   
  110       public void remove(Object key) {
  111           loadIfNecessary();
  112           super.remove(key);
  113       }
  114   
  115       public void clear() {
  116           loadIfNecessary();
  117           super.clear();
  118       }
  119   
  120       public Object[] keys() {
  121           loadIfNecessary();
  122           return super.keys();
  123       }
  124   
  125       public int size() {
  126           loadIfNecessary();
  127           return super.size();
  128       }
  129   
  130       public Object[] allKeys() {
  131           loadIfNecessary();
  132           return super.allKeys();
  133       }
  134   
  135       public void setParent(ActionMap map) {
  136           loadIfNecessary();
  137           super.setParent(map);
  138       }
  139   
  140       private void loadIfNecessary() {
  141           if (_loader != null) {
  142               Object loader = _loader;
  143   
  144               _loader = null;
  145               Class<?> klass = (Class<?>)loader;
  146               try {
  147                   Method method = klass.getDeclaredMethod("loadActionMap",
  148                                         new Class[] { LazyActionMap.class });
  149                   method.invoke(klass, new Object[] { this });
  150               } catch (NoSuchMethodException nsme) {
  151                   assert false : "LazyActionMap unable to load actions " +
  152                           klass;
  153               } catch (IllegalAccessException iae) {
  154                   assert false : "LazyActionMap unable to load actions " +
  155                           iae;
  156               } catch (InvocationTargetException ite) {
  157                   assert false : "LazyActionMap unable to load actions " +
  158                           ite;
  159               } catch (IllegalArgumentException iae) {
  160                   assert false : "LazyActionMap unable to load actions " +
  161                           iae;
  162               }
  163           }
  164       }
  165   }

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