Update from https://crrev.com/327068

base/android/java/src/org/chromium/base/Log.java

Index: base/android/java/src/org/chromium/base/Log.java
diff --git a/base/android/java/src/org/chromium/base/Log.java b/base/android/java/src/org/chromium/base/Log.java
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+// 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();
+    }
+}