Class ReflectedAction

java.lang.Object
javax.swing.AbstractAction
com.gargoylesoftware.base.gui.ReflectedAction
All Implemented Interfaces:
ActionListener, Serializable, Cloneable, EventListener, Action

public class ReflectedAction extends AbstractAction
A swing "action" that uses reflection to find and invoke a given target method.

ReflectedAction is a Swing "action" that uses reflection to call a specific target method when the action is fired. Actions are often implemented using inner classes which can be very inefficient in terms of performance and deployment size. This action is a tiny bit slower when it is actually fired but is smaller and generally faster otherwise due to the fact that those inner classes are no longer needed.

 Action searchAction = new ReflectedAction(this, "performSearch");
 
Version:
$Revision: 1.4 $
See Also:
  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      See Also:
    • object_

      private final Object object_
    • methodName_

      private final String methodName_
  • Constructor Details

    • ReflectedAction

      public ReflectedAction(Object object, String methodName) throws IllegalArgumentException
      Create a reflected action with an object and the name of the method that will be invoked on that object when the action is fired.
      Parameters:
      object - The object upon which we will invoke a method when the action is fired
      methodName - The name of the method that we will invoke. This method must take either no parameters or one parameter which is an ActionEvent.
      Throws:
      IllegalArgumentException - if there are no matching methods.
  • Method Details

    • actionPerformed

      public void actionPerformed(ActionEvent event)
      The action has been fired so now we use reflection to invoke the method that was specified previously.
      Parameters:
      event - The ActionEvent
    • findMethodOnObject

      private Method findMethodOnObject(Object object, String methodName)
      Return the Method object that corresponds to the specified method name. The method may take either no arguments or may take an ActionEvent.
      Parameters:
      object - The object that contains the method
      methodName - The name of the method that we're looking for
      Returns:
      The method that matches the specified name.
      Throws:
      IllegalArgumentException - If there aren't any methods that match.
      SecurityException - If we do not have access to this method.
    • exceptionThrown

      protected void exceptionThrown(Exception exception)
      Callback that will be invoked if an exception is thrown during the reflected method call.

      Override this to provide custom error handling. Default behaviour is to print a stack trace.

      Parameters:
      exception - The exception
    • assertNotNull

      protected final void assertNotNull(String fieldName, Object object)
      Throw an exception if the specified object is null
      Parameters:
      fieldName - The name of the paremeter we are checking
      object - The value of the parameter we are checking