base/android/java/src/org/chromium/base/Log.java - mojo - Git at Google

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.base;

 import android.text.TextUtils;

 import org.chromium.base.annotations.NoSideEffects;

 import java.util.Locale;

 /**
  * Utility class for Logging.
  *
  * <p>
  * Defines logging access points for each feature. They format and forward the logs to
  * {@link android.util.Log}, allowing to standardize the output, to make it easy to identify
  * the origin of logs, and enable or disable logging in different parts of the code.
  * </p>
  * <p>
  * Please make use of the formatting capability of the logging methods rather than doing
  * concatenations in the calling code. In the release builds of Chrome, debug and verbose log
  * calls will be stripped out of the binary. Concatenations and method calls however will still
  * remain and be executed. If they can't be avoided, try to generate the logs in a method annotated
  * with {@link NoSideEffects}. Another possibility is to use
  * {@link android.util.Log#isLoggable(String, int)}, with {@link Log#makeTag(String)} to get the
  * correct tag.
  * </p>
  *
  * Usage:
  * <pre>
  * private void myMethod(String awesome) {
  *   Log.i("Group", "My %s message.", awesome);
  *   Log.d("Group", "My debug message");
  * }
  * </pre>
  *
  * Logcat output:
  * <pre>
  * I/chromium.Group (999): My awesome message
  * D/chromium.Group (999): [MyClass.java:42] My debug message
  * </pre>
  *
  * Set the log level for a given group:
  * <pre>
  * $ adb shell setprop log.tag.chromium.Group VERBOSE
  * </pre>
  */
 public class Log {
     private static final String BASE_TAG = "chromium";

     private Log() {
         // Static only access
     }

     /** Returns a formatted log message, using the supplied format and arguments.*/
     private static String formatLog(String messageTemplate, Object... params) {
         if (params != null && params.length != 0) {
             messageTemplate = String.format(Locale.US, messageTemplate, params);
         }

         return messageTemplate;
     }

     /**
      * Returns a formatted log message, using the supplied format and arguments.
      * The message will be prepended with the filename and line number of the call.
      */
     private static String formatLogWithStack(String messageTemplate, Object... params) {
         return "[" + getCallOrigin() + "] " + formatLog(messageTemplate, params);
     }

     /**
      * Returns a full tag for the provided group tag. Full tags longer than 23 characters
      * will cause a runtime exception later. (see {@link android.util.Log#isLoggable(String, int)})
      *
      * @param groupTag {@code null} and empty string are allowed.
      */
     public static String makeTag(String groupTag) {
         if (TextUtils.isEmpty(groupTag)) return BASE_TAG;
         return BASE_TAG + "." + groupTag;
     }

     /**
      * Sends a {@link android.util.Log#VERBOSE} log message.
      *
      * For optimization purposes, only the fixed parameters versions are visible. If you need more
      * than 7 parameters, consider building your log message using a function annotated with
      * {@link NoSideEffects}.
      *
      * @param groupTag Used to identify the source of a log message. It usually refers to the
      *                 package or feature, to logically group related logs.
      *
      * @param messageTemplate The message you would like logged. It is to be specified as a format
      *                        string.
      * @param args Arguments referenced by the format specifiers in the format string. If the last
      *             one is a {@link Throwable}, its trace will be printed.
      */
     private static void verbose(String groupTag, String messageTemplate, Object... args) {
         String tag = makeTag(groupTag);
         if (android.util.Log.isLoggable(tag, android.util.Log.VERBOSE)) {
             String message = formatLogWithStack(messageTemplate, args);
             Throwable tr = getThrowableToLog(args);
             if (tr != null) {
                 android.util.Log.v(tag, message, tr);
             } else {
                 android.util.Log.v(tag, message);
             }
         }
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 0 arg version. */
     public static void v(String groupTag, String message) {
         verbose(groupTag, message);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 1 arg version. */
     public static void v(String groupTag, String messageTemplate, Object arg1) {
         verbose(groupTag, messageTemplate, arg1);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 2 args version */
     public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2) {
         verbose(groupTag, messageTemplate, arg1, arg2);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 3 args version */
     public static void v(
             String groupTag, String messageTemplate, Object arg1, Object arg2, Object arg3) {
         verbose(groupTag, messageTemplate, arg1, arg2, arg3);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 4 args version */
     public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4) {
         verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 5 args version */
     public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4, Object arg5) {
         verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 6 args version */
     public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4, Object arg5, Object arg6) {
         verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6);
     }

     /** Sends a {@link android.util.Log#VERBOSE} log message. 7 args version */
     public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4, Object arg5, Object arg6, Object arg7) {
         verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
     }

     /**
      * Sends a {@link android.util.Log#DEBUG} log message.
      *
      * For optimization purposes, only the fixed parameters versions are visible. If you need more
      * than 7 parameters, consider building your log message using a function annotated with
      * {@link NoSideEffects}.
      *
      * @param groupTag Used to identify the source of a log message. It usually refers to the
      *                 package or feature, to logically group related logs.
      *
      * @param messageTemplate The message you would like logged. It is to be specified as a format
      *                        string.
      * @param args Arguments referenced by the format specifiers in the format string. If the last
      *             one is a {@link Throwable}, its trace will be printed.
      */
     private static void debug(String groupTag, String messageTemplate, Object... args) {
         String tag = makeTag(groupTag);
         if (android.util.Log.isLoggable(tag, android.util.Log.VERBOSE)) {
             String message = formatLogWithStack(messageTemplate, args);
             Throwable tr = getThrowableToLog(args);
             if (tr != null) {
                 android.util.Log.d(tag, message, tr);
             } else {
                 android.util.Log.d(tag, message);
             }
         }
     }

     /** Sends a {@link android.util.Log#DEBUG} log message. 0 arg version. */
     public static void d(String groupTag, String message) {
         debug(groupTag, message);
     }

     /** Sends a {@link android.util.Log#DEBUG} log message. 1 arg version. */
     public static void d(String groupTag, String messageTemplate, Object arg1) {
         debug(groupTag, messageTemplate, arg1);
     }
     /** Sends a {@link android.util.Log#DEBUG} log message. 2 args version */
     public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2) {
         debug(groupTag, messageTemplate, arg1, arg2);
     }
     /** Sends a {@link android.util.Log#DEBUG} log message. 3 args version */
     public static void d(
             String groupTag, String messageTemplate, Object arg1, Object arg2, Object arg3) {
         debug(groupTag, messageTemplate, arg1, arg2, arg3);
     }

     /** Sends a {@link android.util.Log#DEBUG} log message. 4 args version */
     public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4) {
         debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4);
     }

     /** Sends a {@link android.util.Log#DEBUG} log message. 5 args version */
     public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4, Object arg5) {
         debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5);
     }

     /** Sends a {@link android.util.Log#DEBUG} log message. 6 args version */
     public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4, Object arg5, Object arg6) {
         debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6);
     }

     /** Sends a {@link android.util.Log#DEBUG} log message. 7 args version */
     public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
             Object arg3, Object arg4, Object arg5, Object arg6, Object arg7) {
         debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
     }

     /**
      * Sends an {@link android.util.Log#INFO} log message.
      *
      * @param groupTag Used to identify the source of a log message. It usually refers to the
      *                 package or feature, to logically group related logs.
      * @param messageTemplate The message you would like logged. It is to be specified as a format
      *                        string.
      * @param args Arguments referenced by the format specifiers in the format string. If the last
      *             one is a {@link Throwable}, its trace will be printed.
      */
     public static void i(String groupTag, String messageTemplate, Object... args) {
         String tag = makeTag(groupTag);
         if (android.util.Log.isLoggable(tag, android.util.Log.INFO)) {
             String message = formatLog(messageTemplate, args);
             Throwable tr = getThrowableToLog(args);
             if (tr != null) {
                 android.util.Log.i(tag, message, tr);
             } else {
                 android.util.Log.i(tag, message);
             }
         }
     }

     /**
      * Sends a {@link android.util.Log#WARN} log message.
      *
      * @param groupTag Used to identify the source of a log message. It usually refers to the
      *                 package or feature, to logically group related logs.
      * @param messageTemplate The message you would like logged. It is to be specified as a format
      *                        string.
      * @param args Arguments referenced by the format specifiers in the format string. If the last
      *             one is a {@link Throwable}, its trace will be printed.
      */
     public static void w(String groupTag, String messageTemplate, Object... args) {
         String tag = makeTag(groupTag);
         if (android.util.Log.isLoggable(tag, android.util.Log.WARN)) {
             String message = formatLog(messageTemplate, args);
             Throwable tr = getThrowableToLog(args);
             if (tr != null) {
                 android.util.Log.w(tag, message, tr);
             } else {
                 android.util.Log.w(tag, message);
             }
         }
     }

     /**
      * Sends an {@link android.util.Log#ERROR} log message.
      *
      * @param groupTag Used to identify the source of a log message. It usually refers to the
      *                 package or feature, to logically group related logs.
      * @param messageTemplate The message you would like logged. It is to be specified as a format
      *                        string.
      * @param args Arguments referenced by the format specifiers in the format string. If the last
      *             one is a {@link Throwable}, its trace will be printed.
      */
     public static void e(String groupTag, String messageTemplate, Object... args) {
         String tag = makeTag(groupTag);
         if (android.util.Log.isLoggable(tag, android.util.Log.ERROR)) {
             String message = formatLog(messageTemplate, args);
             Throwable tr = getThrowableToLog(args);
             if (tr != null) {
                 android.util.Log.e(tag, message, tr);
             } else {
                 android.util.Log.e(tag, message);
             }
         }
     }

     /**
      * What a Terrible Failure: Used for conditions that should never happen, and logged at
      * the {@link android.util.Log#ASSERT} level. Depending on the configuration, it might
      * terminate the process.
      *
      * @see android.util.Log#wtf(String, String, Throwable)
      *
      * @param groupTag Used to identify the source of a log message. It usually refers to the
      *                 package or feature, to logically group related logs.
      * @param messageTemplate The message you would like logged. It is to be specified as a format
      *                        string.
      * @param args Arguments referenced by the format specifiers in the format string. If the last
      *             one is a {@link Throwable}, its trace will be printed.
      */
     public static void wtf(String groupTag, String messageTemplate, Object... args) {
         String tag = makeTag(groupTag);
         if (android.util.Log.isLoggable(tag, android.util.Log.ERROR)) {
             String message = formatLog(messageTemplate, args);
             Throwable tr = getThrowableToLog(args);
             if (tr != null) {
                 android.util.Log.wtf(tag, message, tr);
             } else {
                 android.util.Log.wtf(tag, message);
             }
         }
     }

     private static Throwable getThrowableToLog(Object[] args) {
         if (args == null || args.length == 0) return null;

         Object lastArg = args[args.length - 1];

         if (!(lastArg instanceof Throwable)) return null;
         return (Throwable) lastArg;
     }

     /** Returns a string form of the origin of the log call, to be used as secondary tag.*/
     private static String getCallOrigin() {
         StackTraceElement[] st = Thread.currentThread().getStackTrace();

         // The call stack should look like:
         //   n [a variable number of calls depending on the vm used]
         //  +0 getCallOrigin()
         //  +1 privateLogFunction: verbose or debug
         //  +2 formatLogWithStack()
         //  +3 logFunction: v or d
         //  +4 caller

         int callerStackIndex;
         String logClassName = Log.class.getName();
         for (callerStackIndex = 0; callerStackIndex < st.length; callerStackIndex++) {
             if (st[callerStackIndex].getClassName().equals(logClassName)) {
                 callerStackIndex += 4;
                 break;
             }
         }

         return st[callerStackIndex].getFileName() + ":" + st[callerStackIndex].getLineNumber();
     }
 }
	// Copyright 2015 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.base;

	import android.text.TextUtils;

	import org.chromium.base.annotations.NoSideEffects;

	import java.util.Locale;

	/**
	* Utility class for Logging.
	*
	* <p>
	* Defines logging access points for each feature. They format and forward the logs to
	* {@link android.util.Log}, allowing to standardize the output, to make it easy to identify
	* the origin of logs, and enable or disable logging in different parts of the code.
	* </p>
	* <p>
	* Please make use of the formatting capability of the logging methods rather than doing
	* concatenations in the calling code. In the release builds of Chrome, debug and verbose log
	* calls will be stripped out of the binary. Concatenations and method calls however will still
	* remain and be executed. If they can't be avoided, try to generate the logs in a method annotated
	* with {@link NoSideEffects}. Another possibility is to use
	* {@link android.util.Log#isLoggable(String, int)}, with {@link Log#makeTag(String)} to get the
	* correct tag.
	* </p>
	*
	* Usage:
	* <pre>
	* private void myMethod(String awesome) {
	* Log.i("Group", "My %s message.", awesome);
	* Log.d("Group", "My debug message");
	* }
	* </pre>
	*
	* Logcat output:
	* <pre>
	* I/chromium.Group (999): My awesome message
	* D/chromium.Group (999): [MyClass.java:42] My debug message
	* </pre>
	*
	* Set the log level for a given group:
	* <pre>
	* $ adb shell setprop log.tag.chromium.Group VERBOSE
	* </pre>
	*/
	public class Log {
	private static final String BASE_TAG = "chromium";

	private Log() {
	// Static only access
	}

	/** Returns a formatted log message, using the supplied format and arguments.*/
	private static String formatLog(String messageTemplate, Object... params) {
	if (params != null && params.length != 0) {
	messageTemplate = String.format(Locale.US, messageTemplate, params);
	}

	return messageTemplate;
	}

	/**
	* Returns a formatted log message, using the supplied format and arguments.
	* The message will be prepended with the filename and line number of the call.
	*/
	private static String formatLogWithStack(String messageTemplate, Object... params) {
	return "[" + getCallOrigin() + "] " + formatLog(messageTemplate, params);
	}

	/**
	* Returns a full tag for the provided group tag. Full tags longer than 23 characters
	* will cause a runtime exception later. (see {@link android.util.Log#isLoggable(String, int)})
	*
	* @param groupTag {@code null} and empty string are allowed.
	*/
	public static String makeTag(String groupTag) {
	if (TextUtils.isEmpty(groupTag)) return BASE_TAG;
	return BASE_TAG + "." + groupTag;
	}

	/**
	* Sends a {@link android.util.Log#VERBOSE} log message.
	*
	* For optimization purposes, only the fixed parameters versions are visible. If you need more
	* than 7 parameters, consider building your log message using a function annotated with
	* {@link NoSideEffects}.
	*
	* @param groupTag Used to identify the source of a log message. It usually refers to the
	* package or feature, to logically group related logs.
	*
	* @param messageTemplate The message you would like logged. It is to be specified as a format
	* string.
	* @param args Arguments referenced by the format specifiers in the format string. If the last
	* one is a {@link Throwable}, its trace will be printed.
	*/
	private static void verbose(String groupTag, String messageTemplate, Object... args) {
	String tag = makeTag(groupTag);
	if (android.util.Log.isLoggable(tag, android.util.Log.VERBOSE)) {
	String message = formatLogWithStack(messageTemplate, args);
	Throwable tr = getThrowableToLog(args);
	if (tr != null) {
	android.util.Log.v(tag, message, tr);
	} else {
	android.util.Log.v(tag, message);
	}
	}
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 0 arg version. */
	public static void v(String groupTag, String message) {
	verbose(groupTag, message);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 1 arg version. */
	public static void v(String groupTag, String messageTemplate, Object arg1) {
	verbose(groupTag, messageTemplate, arg1);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 2 args version */
	public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2) {
	verbose(groupTag, messageTemplate, arg1, arg2);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 3 args version */
	public static void v(
	String groupTag, String messageTemplate, Object arg1, Object arg2, Object arg3) {
	verbose(groupTag, messageTemplate, arg1, arg2, arg3);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 4 args version */
	public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4) {
	verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 5 args version */
	public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4, Object arg5) {
	verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 6 args version */
	public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4, Object arg5, Object arg6) {
	verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6);
	}

	/** Sends a {@link android.util.Log#VERBOSE} log message. 7 args version */
	public static void v(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4, Object arg5, Object arg6, Object arg7) {
	verbose(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
	}

	/**
	* Sends a {@link android.util.Log#DEBUG} log message.
	*
	* For optimization purposes, only the fixed parameters versions are visible. If you need more
	* than 7 parameters, consider building your log message using a function annotated with
	* {@link NoSideEffects}.
	*
	* @param groupTag Used to identify the source of a log message. It usually refers to the
	* package or feature, to logically group related logs.
	*
	* @param messageTemplate The message you would like logged. It is to be specified as a format
	* string.
	* @param args Arguments referenced by the format specifiers in the format string. If the last
	* one is a {@link Throwable}, its trace will be printed.
	*/
	private static void debug(String groupTag, String messageTemplate, Object... args) {
	String tag = makeTag(groupTag);
	if (android.util.Log.isLoggable(tag, android.util.Log.VERBOSE)) {
	String message = formatLogWithStack(messageTemplate, args);
	Throwable tr = getThrowableToLog(args);
	if (tr != null) {
	android.util.Log.d(tag, message, tr);
	} else {
	android.util.Log.d(tag, message);
	}
	}
	}

	/** Sends a {@link android.util.Log#DEBUG} log message. 0 arg version. */
	public static void d(String groupTag, String message) {
	debug(groupTag, message);
	}

	/** Sends a {@link android.util.Log#DEBUG} log message. 1 arg version. */
	public static void d(String groupTag, String messageTemplate, Object arg1) {
	debug(groupTag, messageTemplate, arg1);
	}
	/** Sends a {@link android.util.Log#DEBUG} log message. 2 args version */
	public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2) {
	debug(groupTag, messageTemplate, arg1, arg2);
	}
	/** Sends a {@link android.util.Log#DEBUG} log message. 3 args version */
	public static void d(
	String groupTag, String messageTemplate, Object arg1, Object arg2, Object arg3) {
	debug(groupTag, messageTemplate, arg1, arg2, arg3);
	}

	/** Sends a {@link android.util.Log#DEBUG} log message. 4 args version */
	public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4) {
	debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4);
	}

	/** Sends a {@link android.util.Log#DEBUG} log message. 5 args version */
	public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4, Object arg5) {
	debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5);
	}

	/** Sends a {@link android.util.Log#DEBUG} log message. 6 args version */
	public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4, Object arg5, Object arg6) {
	debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6);
	}

	/** Sends a {@link android.util.Log#DEBUG} log message. 7 args version */
	public static void d(String groupTag, String messageTemplate, Object arg1, Object arg2,
	Object arg3, Object arg4, Object arg5, Object arg6, Object arg7) {
	debug(groupTag, messageTemplate, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
	}

	/**
	* Sends an {@link android.util.Log#INFO} log message.
	*
	* @param groupTag Used to identify the source of a log message. It usually refers to the
	* package or feature, to logically group related logs.
	* @param messageTemplate The message you would like logged. It is to be specified as a format
	* string.
	* @param args Arguments referenced by the format specifiers in the format string. If the last
	* one is a {@link Throwable}, its trace will be printed.
	*/
	public static void i(String groupTag, String messageTemplate, Object... args) {
	String tag = makeTag(groupTag);
	if (android.util.Log.isLoggable(tag, android.util.Log.INFO)) {
	String message = formatLog(messageTemplate, args);
	Throwable tr = getThrowableToLog(args);
	if (tr != null) {
	android.util.Log.i(tag, message, tr);
	} else {
	android.util.Log.i(tag, message);
	}
	}
	}

	/**
	* Sends a {@link android.util.Log#WARN} log message.
	*
	* @param groupTag Used to identify the source of a log message. It usually refers to the
	* package or feature, to logically group related logs.
	* @param messageTemplate The message you would like logged. It is to be specified as a format
	* string.
	* @param args Arguments referenced by the format specifiers in the format string. If the last
	* one is a {@link Throwable}, its trace will be printed.
	*/
	public static void w(String groupTag, String messageTemplate, Object... args) {
	String tag = makeTag(groupTag);
	if (android.util.Log.isLoggable(tag, android.util.Log.WARN)) {
	String message = formatLog(messageTemplate, args);
	Throwable tr = getThrowableToLog(args);
	if (tr != null) {
	android.util.Log.w(tag, message, tr);
	} else {
	android.util.Log.w(tag, message);
	}
	}
	}

	/**
	* Sends an {@link android.util.Log#ERROR} log message.
	*
	* @param groupTag Used to identify the source of a log message. It usually refers to the
	* package or feature, to logically group related logs.
	* @param messageTemplate The message you would like logged. It is to be specified as a format
	* string.
	* @param args Arguments referenced by the format specifiers in the format string. If the last
	* one is a {@link Throwable}, its trace will be printed.
	*/
	public static void e(String groupTag, String messageTemplate, Object... args) {
	String tag = makeTag(groupTag);
	if (android.util.Log.isLoggable(tag, android.util.Log.ERROR)) {
	String message = formatLog(messageTemplate, args);
	Throwable tr = getThrowableToLog(args);
	if (tr != null) {
	android.util.Log.e(tag, message, tr);
	} else {
	android.util.Log.e(tag, message);
	}
	}
	}

	/**
	* What a Terrible Failure: Used for conditions that should never happen, and logged at
	* the {@link android.util.Log#ASSERT} level. Depending on the configuration, it might
	* terminate the process.
	*
	* @see android.util.Log#wtf(String, String, Throwable)
	*
	* @param groupTag Used to identify the source of a log message. It usually refers to the
	* package or feature, to logically group related logs.
	* @param messageTemplate The message you would like logged. It is to be specified as a format
	* string.
	* @param args Arguments referenced by the format specifiers in the format string. If the last
	* one is a {@link Throwable}, its trace will be printed.
	*/
	public static void wtf(String groupTag, String messageTemplate, Object... args) {
	String tag = makeTag(groupTag);
	if (android.util.Log.isLoggable(tag, android.util.Log.ERROR)) {
	String message = formatLog(messageTemplate, args);
	Throwable tr = getThrowableToLog(args);
	if (tr != null) {
	android.util.Log.wtf(tag, message, tr);
	} else {
	android.util.Log.wtf(tag, message);
	}
	}
	}

	private static Throwable getThrowableToLog(Object[] args) {
	if (args == null \|\| args.length == 0) return null;

	Object lastArg = args[args.length - 1];

	if (!(lastArg instanceof Throwable)) return null;
	return (Throwable) lastArg;
	}

	/** Returns a string form of the origin of the log call, to be used as secondary tag.*/
	private static String getCallOrigin() {
	StackTraceElement[] st = Thread.currentThread().getStackTrace();

	// The call stack should look like:
	// n [a variable number of calls depending on the vm used]
	// +0 getCallOrigin()
	// +1 privateLogFunction: verbose or debug
	// +2 formatLogWithStack()
	// +3 logFunction: v or d
	// +4 caller

	int callerStackIndex;
	String logClassName = Log.class.getName();
	for (callerStackIndex = 0; callerStackIndex < st.length; callerStackIndex++) {
	if (st[callerStackIndex].getClassName().equals(logClassName)) {
	callerStackIndex += 4;
	break;
	}
	}

	return st[callerStackIndex].getFileName() + ":" + st[callerStackIndex].getLineNumber();
	}
	}