1 /*
2  * Copyright (C) 2012 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package libcore.io;
18 
19 public final class EventLogger {
20 
21     /**
22      * Hook for customizing how events are reported.
23      */
24     private static volatile Reporter REPORTER = new DefaultReporter();
25 
26     /**
27      * Used to replace default Reporter for logging events. Must be non-null.
28      */
setReporter(Reporter reporter)29     public static void setReporter(Reporter reporter) {
30         if (reporter == null) {
31             throw new NullPointerException("reporter == null");
32         }
33         REPORTER = reporter;
34     }
35 
36     /**
37      * Returns non-null Reporter.
38      */
getReporter()39     public static Reporter getReporter() {
40         return REPORTER;
41     }
42 
43     /**
44      * Interface to allow customization of reporting behavior.
45      */
46     public static interface Reporter {
report(int code, Object... list)47         public void report (int code, Object... list);
48     }
49 
50     /**
51      * Default Reporter which reports events to the log.
52      */
53     private static final class DefaultReporter implements Reporter {
54         @Override
report(int code, Object... list)55         public void report (int code, Object... list) {
56             StringBuilder sb = new StringBuilder();
57             sb.append(code);
58             for (Object o : list) {
59                 sb.append(",");
60                 sb.append(o.toString());
61             }
62             System.out.println(sb);
63         }
64     }
65 
writeEvent(int code, Object... list)66     public static void writeEvent(int code, Object... list) {
67         getReporter().report(code, list);
68     }
69 }
70