1// © 2016 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3/**
4 *******************************************************************************
5 * Copyright (C) 2001-2012, International Business Machines Corporation and *
6 * others. All Rights Reserved. *
7 *******************************************************************************
8 */
9
10#include "unicode/utypes.h"
11
12#if !UCONFIG_NO_SERVICE
13
14#include "servnotf.h"
15#ifdef NOTIFIER_DEBUG
16#include <stdio.h>
17#endif
18
19U_NAMESPACE_BEGIN
20
21EventListener::~EventListener() {}
22UOBJECT_DEFINE_RTTI_IMPLEMENTATION(EventListener)
23
24static UMutex notifyLock;
25
26ICUNotifier::ICUNotifier()
27: listeners(nullptr)
28{
29}
30
31ICUNotifier::~ICUNotifier() {
32 {
33 Mutex lmx(&notifyLock);
34 delete listeners;
35 listeners = nullptr;
36 }
37}
38
39
40void
41ICUNotifier::addListener(const EventListener* l, UErrorCode& status)
42{
43 if (U_SUCCESS(status)) {
44 if (l == nullptr) {
45 status = U_ILLEGAL_ARGUMENT_ERROR;
46 return;
47 }
48
49 if (acceptsListener(*l)) {
50 Mutex lmx(&notifyLock);
51 if (listeners == nullptr) {
52 LocalPointer<UVector> lpListeners(new UVector(5, status), status);
53 if (U_FAILURE(status)) {
54 return;
55 }
56 listeners = lpListeners.orphan();
57 } else {
58 for (int i = 0, e = listeners->size(); i < e; ++i) {
59 const EventListener* el = (const EventListener*)(listeners->elementAt(i));
60 if (l == el) {
61 return;
62 }
63 }
64 }
65
66 listeners->addElement((void*)l, status); // cast away const
67 }
68#ifdef NOTIFIER_DEBUG
69 else {
70 fprintf(stderr, "Listener invalid for this notifier.");
71 exit(1);
72 }
73#endif
74 }
75}
76
77void
78ICUNotifier::removeListener(const EventListener *l, UErrorCode& status)
79{
80 if (U_SUCCESS(status)) {
81 if (l == nullptr) {
82 status = U_ILLEGAL_ARGUMENT_ERROR;
83 return;
84 }
85
86 {
87 Mutex lmx(&notifyLock);
88 if (listeners != nullptr) {
89 // identity equality check
90 for (int i = 0, e = listeners->size(); i < e; ++i) {
91 const EventListener* el = (const EventListener*)listeners->elementAt(i);
92 if (l == el) {
93 listeners->removeElementAt(i);
94 if (listeners->size() == 0) {
95 delete listeners;
96 listeners = nullptr;
97 }
98 return;
99 }
100 }
101 }
102 }
103 }
104}
105
106void
107ICUNotifier::notifyChanged()
108{
109 Mutex lmx(&notifyLock);
110 if (listeners != nullptr) {
111 for (int i = 0, e = listeners->size(); i < e; ++i) {
112 EventListener* el = (EventListener*)listeners->elementAt(i);
113 notifyListener(*el);
114 }
115 }
116}
117
118U_NAMESPACE_END
119
120/* UCONFIG_NO_SERVICE */
121#endif
122
123