Angus Kong | 2bca210 | 2014-03-11 16:27:30 -0700 | [diff] [blame^] | 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 | |
| 17 | package com.android.camera.debug; |
| 18 | |
| 19 | public class Log { |
| 20 | public static final String CAMERA_LOGTAG_PREFIX = "CAM_"; |
| 21 | private static final Log.Tag TAG = new Log.Tag("Log"); |
| 22 | |
| 23 | /** |
| 24 | * This class restricts the length of the log tag to be less than the |
| 25 | * framework limit and also prepends the common tag prefix defined by |
| 26 | * {@code CAMERA_LOGTAG_PREFIX}. |
| 27 | */ |
| 28 | public static final class Tag { |
| 29 | |
| 30 | // The length limit from Android framework is 23. |
| 31 | private static final int MAX_TAG_LEN = 23 - CAMERA_LOGTAG_PREFIX.length(); |
| 32 | |
| 33 | final String mValue; |
| 34 | |
| 35 | public Tag(String tag) { |
| 36 | final int lenDiff = tag.length() - MAX_TAG_LEN; |
| 37 | if (lenDiff > 0) { |
| 38 | w(TAG, "Tag " + tag + " is " + lenDiff + " chars longer than limit."); |
| 39 | } |
| 40 | mValue = CAMERA_LOGTAG_PREFIX + (lenDiff > 0 ? tag.substring(0, MAX_TAG_LEN) : tag); |
| 41 | } |
| 42 | |
| 43 | @Override |
| 44 | public String toString() { |
| 45 | return mValue; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | private interface Logger { |
| 50 | void log(Tag tag, String msg); |
| 51 | void log(Tag tag, String msg, Throwable tr); |
| 52 | } |
| 53 | |
| 54 | private static final Logger SILENT_LOGGER = new Logger() { |
| 55 | @Override |
| 56 | public void log(Tag tag, String msg) { |
| 57 | // Do nothing. |
| 58 | } |
| 59 | |
| 60 | @Override |
| 61 | public void log(Tag tag, String msg, Throwable tr) { |
| 62 | // Do nothing. |
| 63 | } |
| 64 | }; |
| 65 | |
| 66 | private static final Logger LOGGER_D = (!CurrentConfig.get().logDebug() ? SILENT_LOGGER : new Logger() { |
| 67 | final int level = android.util.Log.DEBUG; |
| 68 | |
| 69 | @Override |
| 70 | public void log(Tag tag, String msg) { |
| 71 | if (isLoggable(tag, level)) { |
| 72 | android.util.Log.d(tag.toString(), msg); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public void log(Tag tag, String msg, Throwable tr) { |
| 78 | if (isLoggable(tag, level)) { |
| 79 | android.util.Log.d(tag.toString(), msg, tr); |
| 80 | } |
| 81 | } |
| 82 | }); |
| 83 | |
| 84 | private static final Logger LOGGER_E = (!CurrentConfig.get().logError() ? SILENT_LOGGER : new Logger() { |
| 85 | final int level = android.util.Log.ERROR; |
| 86 | |
| 87 | @Override |
| 88 | public void log(Tag tag, String msg) { |
| 89 | if (isLoggable(tag, level)) { |
| 90 | android.util.Log.e(tag.toString(), msg); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | @Override |
| 95 | public void log(Tag tag, String msg, Throwable tr) { |
| 96 | if (isLoggable(tag, level)) { |
| 97 | android.util.Log.e(tag.toString(), msg, tr); |
| 98 | } |
| 99 | } |
| 100 | }); |
| 101 | |
| 102 | private static final Logger LOGGER_I = (!CurrentConfig.get().logInfo() ? SILENT_LOGGER : new Logger() { |
| 103 | final int level = android.util.Log.INFO; |
| 104 | |
| 105 | @Override |
| 106 | public void log(Tag tag, String msg) { |
| 107 | if (isLoggable(tag, level)) { |
| 108 | android.util.Log.i(tag.toString(), msg); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | @Override |
| 113 | public void log(Tag tag, String msg, Throwable tr) { |
| 114 | if (isLoggable(tag, level)) { |
| 115 | android.util.Log.i(tag.toString(), msg, tr); |
| 116 | } |
| 117 | } |
| 118 | }); |
| 119 | |
| 120 | private static final Logger LOGGER_V = (!CurrentConfig.get().logVerbose() ? SILENT_LOGGER : new Logger() { |
| 121 | final int level = android.util.Log.VERBOSE; |
| 122 | |
| 123 | @Override |
| 124 | public void log(Tag tag, String msg) { |
| 125 | if (isLoggable(tag, level)) { |
| 126 | android.util.Log.v(tag.toString(), msg); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | @Override |
| 131 | public void log(Tag tag, String msg, Throwable tr) { |
| 132 | if (isLoggable(tag, level)) { |
| 133 | android.util.Log.v(tag.toString(), msg, tr); |
| 134 | } |
| 135 | } |
| 136 | }); |
| 137 | |
| 138 | private static final Logger LOGGER_W = (!CurrentConfig.get().logWarn() ? SILENT_LOGGER : new Logger() { |
| 139 | final int level = android.util.Log.WARN; |
| 140 | |
| 141 | @Override |
| 142 | public void log(Tag tag, String msg) { |
| 143 | if (isLoggable(tag, level)) { |
| 144 | android.util.Log.w(tag.toString(), msg); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | @Override |
| 149 | public void log(Tag tag, String msg, Throwable tr) { |
| 150 | if (isLoggable(tag, level)) { |
| 151 | android.util.Log.w(tag.toString(), msg, tr); |
| 152 | } |
| 153 | } |
| 154 | }); |
| 155 | |
| 156 | |
| 157 | public static void d(Tag tag, String msg) { |
| 158 | LOGGER_D.log(tag, msg); |
| 159 | } |
| 160 | |
| 161 | public static void d(Tag tag, String msg, Throwable tr) { |
| 162 | LOGGER_D.log(tag, msg, tr); |
| 163 | } |
| 164 | |
| 165 | public static void e(Tag tag, String msg) { |
| 166 | LOGGER_E.log(tag, msg); |
| 167 | } |
| 168 | |
| 169 | public static void e(Tag tag, String msg, Throwable tr) { |
| 170 | LOGGER_E.log(tag, msg, tr); |
| 171 | } |
| 172 | |
| 173 | public static void i(Tag tag, String msg) { |
| 174 | LOGGER_I.log(tag, msg); |
| 175 | } |
| 176 | |
| 177 | public static void i(Tag tag, String msg, Throwable tr) { |
| 178 | LOGGER_I.log(tag, msg, tr); |
| 179 | } |
| 180 | |
| 181 | public static void v(Tag tag, String msg) { |
| 182 | LOGGER_V.log(tag, msg); |
| 183 | } |
| 184 | |
| 185 | public static void v(Tag tag, String msg, Throwable tr) { |
| 186 | LOGGER_V.log(tag, msg, tr); |
| 187 | } |
| 188 | |
| 189 | public static void w(Tag tag, String msg) { |
| 190 | LOGGER_W.log(tag, msg); |
| 191 | } |
| 192 | |
| 193 | public static void w(Tag tag, String msg, Throwable tr) { |
| 194 | LOGGER_W.log(tag, msg, tr); |
| 195 | } |
| 196 | |
| 197 | private static boolean isLoggable(Tag tag, int level) { |
| 198 | try { |
| 199 | return android.util.Log.isLoggable(tag.toString(), level); |
| 200 | } catch (IllegalArgumentException ex) { |
| 201 | e(TAG, "Tag too long:" + tag); |
| 202 | return false; |
| 203 | } |
| 204 | } |
| 205 | } |