com.gargoylesoftware.base.gui

Class ReflectedAction

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 $

Author: Mike Bowler

Field Summary
StringmethodName_
Objectobject_
static longserialVersionUID
Constructor Summary
ReflectedAction(Object object, String methodName)
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.
Method Summary
voidactionPerformed(ActionEvent event)
The action has been fired so now we use reflection to invoke the method that was specified previously.
protected voidassertNotNull(String fieldName, Object object)
Throw an exception if the specified object is null
protected voidexceptionThrown(Exception exception)
Callback that will be invoked if an exception is thrown during the reflected method call.

Override this to provide custom error handling.

MethodfindMethodOnObject(Object object, String methodName)
Return the Method object that corresponds to the specified method name.

Field Detail

methodName_

private final String methodName_

object_

private final Object object_

serialVersionUID

private static final long serialVersionUID

Constructor Detail

ReflectedAction

public ReflectedAction(Object object, String methodName)
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 Detail

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

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

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

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.