1 /*
2  * Copyright (C) 2014 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 package com.example.android.mediabrowserservice.utils;
17 
18 import android.util.Log;
19 
20 import com.example.android.mediabrowserservice.BuildConfig;
21 
22 public class LogHelper {
23 
24     private static final String LOG_PREFIX = "sample_";
25     private static final int LOG_PREFIX_LENGTH = LOG_PREFIX.length();
26     private static final int MAX_LOG_TAG_LENGTH = 23;
27 
makeLogTag(String str)28     public static String makeLogTag(String str) {
29         if (str.length() > MAX_LOG_TAG_LENGTH - LOG_PREFIX_LENGTH) {
30             return LOG_PREFIX + str.substring(0, MAX_LOG_TAG_LENGTH - LOG_PREFIX_LENGTH - 1);
31         }
32 
33         return LOG_PREFIX + str;
34     }
35 
36     /**
37      * Don't use this when obfuscating class names!
38      */
makeLogTag(Class cls)39     public static String makeLogTag(Class cls) {
40         return makeLogTag(cls.getSimpleName());
41     }
42 
43 
v(String tag, Object... messages)44     public static void v(String tag, Object... messages) {
45         // Only log VERBOSE if build type is DEBUG
46         if (BuildConfig.DEBUG) {
47             log(tag, Log.VERBOSE, null, messages);
48         }
49     }
50 
d(String tag, Object... messages)51     public static void d(String tag, Object... messages) {
52         // Only log DEBUG if build type is DEBUG
53         if (BuildConfig.DEBUG) {
54             log(tag, Log.DEBUG, null, messages);
55         }
56     }
57 
i(String tag, Object... messages)58     public static void i(String tag, Object... messages) {
59         log(tag, Log.INFO, null, messages);
60     }
61 
w(String tag, Object... messages)62     public static void w(String tag, Object... messages) {
63         log(tag, Log.WARN, null, messages);
64     }
65 
w(String tag, Throwable t, Object... messages)66     public static void w(String tag, Throwable t, Object... messages) {
67         log(tag, Log.WARN, t, messages);
68     }
69 
e(String tag, Object... messages)70     public static void e(String tag, Object... messages) {
71         log(tag, Log.ERROR, null, messages);
72     }
73 
e(String tag, Throwable t, Object... messages)74     public static void e(String tag, Throwable t, Object... messages) {
75         log(tag, Log.ERROR, t, messages);
76     }
77 
log(String tag, int level, Throwable t, Object... messages)78     public static void log(String tag, int level, Throwable t, Object... messages) {
79         if (Log.isLoggable(tag, level)) {
80             String message;
81             if (t == null && messages != null && messages.length == 1) {
82                 // handle this common case without the extra cost of creating a stringbuffer:
83                 message = messages[0].toString();
84             } else {
85                 StringBuilder sb = new StringBuilder();
86                 if (messages != null) for (Object m : messages) {
87                     sb.append(m);
88                 }
89                 if (t != null) {
90                     sb.append("\n").append(Log.getStackTraceString(t));
91                 }
92                 message = sb.toString();
93             }
94             Log.println(level, tag, message);
95         }
96     }
97 }
98