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- /*
- * Copyright (C) 2010, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.events;
-
- import java.util.List;
- import java.util.Map;
- import java.util.concurrent.ConcurrentHashMap;
- import java.util.concurrent.CopyOnWriteArrayList;
-
- /**
- * Manages a thread-safe list of {@link org.eclipse.jgit.events.RepositoryListener}s.
- */
- public class ListenerList {
- private final Map<Class<? extends RepositoryListener>, CopyOnWriteArrayList<ListenerHandle>> lists = new ConcurrentHashMap<>();
-
- /**
- * Register a {@link org.eclipse.jgit.events.WorkingTreeModifiedListener}.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- * @since 4.9
- */
- public ListenerHandle addWorkingTreeModifiedListener(
- WorkingTreeModifiedListener listener) {
- return addListener(WorkingTreeModifiedListener.class, listener);
- }
-
- /**
- * Register an IndexChangedListener.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- */
- public ListenerHandle addIndexChangedListener(IndexChangedListener listener) {
- return addListener(IndexChangedListener.class, listener);
- }
-
- /**
- * Register a RefsChangedListener.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- */
- public ListenerHandle addRefsChangedListener(RefsChangedListener listener) {
- return addListener(RefsChangedListener.class, listener);
- }
-
- /**
- * Register a ConfigChangedListener.
- *
- * @param listener
- * the listener implementation.
- * @return handle to later remove the listener.
- */
- public ListenerHandle addConfigChangedListener(
- ConfigChangedListener listener) {
- return addListener(ConfigChangedListener.class, listener);
- }
-
- /**
- * Add a listener to the list.
- *
- * @param type
- * type of listener being registered.
- * @param listener
- * the listener instance.
- * @return a handle to later remove the registration, if desired.
- */
- public <T extends RepositoryListener> ListenerHandle addListener(
- Class<T> type, T listener) {
- ListenerHandle handle = new ListenerHandle(this, type, listener);
- add(handle);
- return handle;
- }
-
- /**
- * Dispatch an event to all interested listeners.
- * <p>
- * Listeners are selected by the type of listener the event delivers to.
- *
- * @param event
- * the event to deliver.
- */
- @SuppressWarnings("unchecked")
- public void dispatch(RepositoryEvent event) {
- List<ListenerHandle> list = lists.get(event.getListenerType());
- if (list != null) {
- for (ListenerHandle handle : list)
- event.dispatch(handle.listener);
- }
- }
-
- private void add(ListenerHandle handle) {
- List<ListenerHandle> list = lists.get(handle.type);
- if (list == null) {
- CopyOnWriteArrayList<ListenerHandle> newList;
-
- newList = new CopyOnWriteArrayList<>();
- list = lists.putIfAbsent(handle.type, newList);
- if (list == null)
- list = newList;
- }
- list.add(handle);
- }
-
- void remove(ListenerHandle handle) {
- List<ListenerHandle> list = lists.get(handle.type);
- if (list != null)
- list.remove(handle);
- }
- }
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