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Check for and reject null event listeners.

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This commit is contained in:
Mike Hearn 2013-12-11 09:48:47 -08:00
parent 2879f7bb9b
commit 24d38cdba4
1 changed files with 8 additions and 4 deletions
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12
core/src/main/java/com/google/bitcoin/utils/ListenerRegistration.java
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@ -19,19 +19,23 @@ package com.google.bitcoin.utils;
import java.util.List; import java.util.List;
import java.util.concurrent.Executor; import java.util.concurrent.Executor;
import static com.google.common.base.Preconditions.checkNotNull;
/** /**
* A simple wrapper around a listener and an executor, with some utility methods. * A simple wrapper around a listener and an executor, with some utility methods.
*/ */
public class ListenerRegistration<T> { public class ListenerRegistration<T> {
public T listener; public final T listener;
public Executor executor; public final Executor executor;
public ListenerRegistration(T listener, Executor executor) { public ListenerRegistration(T listener, Executor executor) {
this.listener = listener; this.listener = checkNotNull(listener);
this.executor = executor; this.executor = checkNotNull(executor);
} }
public static <T> boolean removeFromList(T listener, List<? extends ListenerRegistration<T>> list) { public static <T> boolean removeFromList(T listener, List<? extends ListenerRegistration<T>> list) {
checkNotNull(listener);
ListenerRegistration<T> item = null; ListenerRegistration<T> item = null;
for (ListenerRegistration<T> registration : list) { for (ListenerRegistration<T> registration : list) {
if (registration.listener == listener) { if (registration.listener == listener) {