/* | |
* Copyright (c) 2004-2013 QOS.ch | |
* All rights reserved. | |
* | |
* Permission is hereby granted, free of charge, to any person obtaining | |
* a copy of this software and associated documentation files (the | |
* "Software"), to deal in the Software without restriction, including | |
* without limitation the rights to use, copy, modify, merge, publish, | |
* distribute, sublicense, and/or sell copies of the Software, and to | |
* permit persons to whom the Software is furnished to do so, subject to | |
* the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be | |
* included in all copies or substantial portions of the Software. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | |
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | |
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | |
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
* | |
*/ | |
package org.slf4j.impl; | |
import org.slf4j.ILoggerFactory; | |
import org.slf4j.Logger; | |
import java.util.concurrent.ConcurrentHashMap; | |
import java.util.concurrent.ConcurrentMap; | |
/** | |
* AndroidLoggerFactory is an implementation of {@link ILoggerFactory} returning | |
* the appropriately named {@link AndroidLoggerFactory} instance. | |
* | |
* @author Andrey Korzhevskiy <a.korzhevskiy@gmail.com> | |
*/ | |
public class AndroidLoggerFactory implements ILoggerFactory { | |
private final ConcurrentMap<String, Logger> loggerMap; | |
static final String ANONYMOUS_TAG = "null"; | |
static final int TAG_MAX_LENGTH = 23; | |
public AndroidLoggerFactory() { | |
loggerMap = new ConcurrentHashMap<String, Logger>(); | |
} | |
/** | |
* Return an appropriate {@link AndroidLoggerAdapter} instance by name. | |
*/ | |
public Logger getLogger(String name) { | |
String tag = loggerNameToTag(name); | |
Logger logger = loggerMap.get(tag); | |
if (logger == null) { | |
Logger newInstance = new AndroidLoggerAdapter(tag); | |
Logger oldInstance = loggerMap.putIfAbsent(tag, newInstance); | |
logger = oldInstance == null ? newInstance : oldInstance; | |
} | |
return logger; | |
} | |
/** | |
* Tag names cannot be longer than {@value #TAG_MAX_LENGTH} characters on Android platform. | |
* | |
* Returns the short logger tag (up to {@value #TAG_MAX_LENGTH} characters) for the given logger name. | |
* Traditionally loggers are named by fully-qualified Java classes; this | |
* method attempts to return a concise identifying part of such names. | |
* | |
* See also: | |
* android/system/core/include/cutils/property.h | |
* android/frameworks/base/core/jni/android_util_Log.cpp | |
* dalvik.system.DalvikLogging | |
* | |
*/ | |
static String loggerNameToTag(String loggerName) { | |
// Anonymous logger | |
if (loggerName == null) { | |
return ANONYMOUS_TAG; | |
} | |
int length = loggerName.length(); | |
if (length <= TAG_MAX_LENGTH) { | |
return loggerName; | |
} | |
int lastTokenIndex = 0; | |
int lastPeriodIndex; | |
StringBuilder tagName = new StringBuilder(); | |
while ((lastPeriodIndex = loggerName.indexOf('.', lastTokenIndex)) != -1) { | |
tagName.append(loggerName.charAt(lastTokenIndex)); | |
// token of one character appended as is otherwise truncate it to one character | |
int tokenLength = lastPeriodIndex - lastTokenIndex; | |
if (tokenLength > 1) { | |
tagName.append('*'); | |
} | |
tagName.append('.'); | |
lastTokenIndex = lastPeriodIndex + 1; | |
} | |
// last token (usually class name) appended as is | |
tagName.append(loggerName, lastTokenIndex, length); | |
if (tagName.length() <= TAG_MAX_LENGTH) { | |
return tagName.toString(); | |
} | |
// Either we had no useful dot location at all or name still too long. | |
// Take leading part and append '*' to indicate that it was truncated | |
lastPeriodIndex = loggerName.lastIndexOf('.'); | |
return lastPeriodIndex != -1 && length - (lastPeriodIndex + 1) <= TAG_MAX_LENGTH | |
? loggerName.substring(lastPeriodIndex + 1) | |
: '*' + loggerName.substring(length - TAG_MAX_LENGTH + 1); | |
} | |
} |