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src/java.desktop/share/classes/javax/swing/plaf/basic/LazyActionMap.java

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  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 @SuppressWarnings("serial") // Same-version serialization only
  39 class LazyActionMap extends ActionMapUIResource {
  40     /**
  41      * Object to invoke <code>loadActionMap</code> on. This may be
  42      * a Class object.
  43      */
  44     private transient Object _loader;
  45 
  46     /**
  47      * Installs an ActionMap that will be populated by invoking the
  48      * <code>loadActionMap</code> method on the specified Class
  49      * when necessary.
  50      * <p>
  51      * This should be used if the ActionMap can be shared.
  52      *
  53      * @param c JComponent to install the ActionMap on.
  54      * @param loaderClass Class object that gets loadActionMap invoked
  55      *                    on.
  56      * @param defaultsKey Key to use to defaults table to check for
  57      *        existing map and what resulting Map will be registered on.
  58      */
  59     static void installLazyActionMap(JComponent c, Class<?> loaderClass,
  60                                      String defaultsKey) {
  61         ActionMap map = (ActionMap)UIManager.get(defaultsKey);
  62         if (map == null) {
  63             map = new LazyActionMap(loaderClass);
  64             UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
  65         }
  66         SwingUtilities.replaceUIActionMap(c, map);
  67     }
  68 
  69     /**
  70      * Returns an ActionMap that will be populated by invoking the
  71      * <code>loadActionMap</code> method on the specified Class
  72      * when necessary.
  73      * <p>
  74      * This should be used if the ActionMap can be shared.
  75      *
  76      * @param c JComponent to install the ActionMap on.
  77      * @param loaderClass Class object that gets loadActionMap invoked
  78      *                    on.
  79      * @param defaultsKey Key to use to defaults table to check for
  80      *        existing map and what resulting Map will be registered on.
  81      */
  82     static ActionMap getActionMap(Class<?> loaderClass,
  83                                   String defaultsKey) {
  84         ActionMap map = (ActionMap)UIManager.get(defaultsKey);
  85         if (map == null) {
  86             map = new LazyActionMap(loaderClass);
  87             UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
  88         }
  89         return map;
  90     }
  91 




  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}
  34  * method on the passed in Object.
  35  *
  36  * @author Scott Violet
  37  */
  38 @SuppressWarnings("serial") // Same-version serialization only
  39 class LazyActionMap extends ActionMapUIResource {
  40     /**
  41      * Object to invoke {@code loadActionMap} on. This may be
  42      * a Class object.
  43      */
  44     private transient Object _loader;
  45 
  46     /**
  47      * Installs an ActionMap that will be populated by invoking the
  48      * {@code loadActionMap} method on the specified Class
  49      * when necessary.
  50      * <p>
  51      * This should be used if the ActionMap can be shared.
  52      *
  53      * @param c JComponent to install the ActionMap on.
  54      * @param loaderClass Class object that gets loadActionMap invoked
  55      *                    on.
  56      * @param defaultsKey Key to use to defaults table to check for
  57      *        existing map and what resulting Map will be registered on.
  58      */
  59     static void installLazyActionMap(JComponent c, Class<?> loaderClass,
  60                                      String defaultsKey) {
  61         ActionMap map = (ActionMap)UIManager.get(defaultsKey);
  62         if (map == null) {
  63             map = new LazyActionMap(loaderClass);
  64             UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
  65         }
  66         SwingUtilities.replaceUIActionMap(c, map);
  67     }
  68 
  69     /**
  70      * Returns an ActionMap that will be populated by invoking the
  71      * {@code loadActionMap} method on the specified Class
  72      * when necessary.
  73      * <p>
  74      * This should be used if the ActionMap can be shared.
  75      *
  76      * @param c JComponent to install the ActionMap on.
  77      * @param loaderClass Class object that gets loadActionMap invoked
  78      *                    on.
  79      * @param defaultsKey Key to use to defaults table to check for
  80      *        existing map and what resulting Map will be registered on.
  81      */
  82     static ActionMap getActionMap(Class<?> loaderClass,
  83                                   String defaultsKey) {
  84         ActionMap map = (ActionMap)UIManager.get(defaultsKey);
  85         if (map == null) {
  86             map = new LazyActionMap(loaderClass);
  87             UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
  88         }
  89         return map;
  90     }
  91 


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