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git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1082303 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Oliver Heger 2011-03-16 21:19:12 +00:00
parent f241657448
commit 79fb5075bc
1 changed files with 32 additions and 4 deletions
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36
src/main/java/org/apache/commons/lang3/event/EventUtils.java
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@ -49,9 +49,13 @@ public class EventUtils {
try {
MethodUtils.invokeMethod(eventSource, "add" + listenerType.getSimpleName(), listener);
} catch (NoSuchMethodException e) {
throw new IllegalArgumentException("Class " + eventSource.getClass().getName() + " does not have a public add" + listenerType.getSimpleName() + " method which takes a parameter of type " + listenerType.getName() + ".");
throw new IllegalArgumentException("Class " + eventSource.getClass().getName()
+ " does not have a public add" + listenerType.getSimpleName()
+ " method which takes a parameter of type " + listenerType.getName() + ".");
} catch (IllegalAccessException e) {
throw new IllegalArgumentException("Class " + eventSource.getClass().getName() + " does not have an accessible add" + listenerType.getSimpleName () + " method which takes a parameter of type " + listenerType.getName() + ".");
throw new IllegalArgumentException("Class " + eventSource.getClass().getName()
+ " does not have an accessible add" + listenerType.getSimpleName ()
+ " method which takes a parameter of type " + listenerType.getName() + ".");
} catch (InvocationTargetException e) {
throw new RuntimeException("Unable to add listener.", e.getCause());
}
@ -68,8 +72,10 @@ public class EventUtils {
* @param eventTypes the event types (method names) from the listener interface (if none specified, all will be
* supported)
*/
public static <L> void bindEventsToMethod(Object target, String methodName, Object eventSource, Class<L> listenerType, String... eventTypes) {
final L listener = listenerType.cast(Proxy.newProxyInstance(target.getClass().getClassLoader(), new Class[] { listenerType }, new EventBindingInvocationHandler(target, methodName, eventTypes)));
public static <L> void bindEventsToMethod(Object target, String methodName, Object eventSource,
Class<L> listenerType, String... eventTypes) {
final L listener = listenerType.cast(Proxy.newProxyInstance(target.getClass().getClassLoader(),
new Class[] { listenerType }, new EventBindingInvocationHandler(target, methodName, eventTypes)));
addEventListener(eventSource, listenerType, listener);
}
@ -78,12 +84,28 @@ public class EventUtils {
private final String methodName;
private final Set<String> eventTypes;
/**
* Creates a new instance of {@code EventBindingInvocationHandler}.
*
* @param target the target object for method invocations
* @param methodName the name of the method to be invoked
* @param eventTypes the names of the supported event types
*/
public EventBindingInvocationHandler(final Object target, final String methodName, String[] eventTypes) {
this.target = target;
this.methodName = methodName;
this.eventTypes = new HashSet<String>(Arrays.asList(eventTypes));
}
/**
* Handles a method invocation on the proxy object.
*
* @param proxy the proxy instance
* @param method the method to be invoked
* @param parameters the parameters for the method invocation
* @return the result of the method call
* @throws Throwable if an error occurs
*/
public Object invoke(final Object proxy, final Method method, final Object[] parameters) throws Throwable {
if ( eventTypes.isEmpty() || eventTypes.contains(method.getName())) {
if (hasMatchingParametersMethod(method)) {
@ -95,6 +117,12 @@ public class EventUtils {
return null;
}
/**
* Checks whether a method for the passed in parameters can be found.
*
* @param method the method to be invoked
* @return a flag whether the parameters could be matched
*/
private boolean hasMatchingParametersMethod(final Method method) {
return MethodUtils.getAccessibleMethod(target.getClass(), methodName, method.getParameterTypes()) != null;
}