Android Open Source - NavigationDrawer Log

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The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright (C) 2013 The Android Open Source Project
 */*  ww  w .j  a v a  2 s  .c om*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.common.logger;

/**
 * Helper class for a list (or tree) of LoggerNodes.
 * <p/>
 * <p>When this is set as the head of the list,
 * an instance of it can function as a drop-in replacement for {@link android.util.Log}.
 * Most of the methods in this class server only to map a method call in Log to its equivalent
 * in LogNode.</p>
 */
public class Log {
  // Grabbing the native values from Android's native logging facilities,
  // to make for easy migration and interop.
  public static final int NONE = -1;
  public static final int VERBOSE = android.util.Log.VERBOSE;
  public static final int DEBUG = android.util.Log.DEBUG;
  public static final int INFO = android.util.Log.INFO;
  public static final int WARN = android.util.Log.WARN;
  public static final int ERROR = android.util.Log.ERROR;
  public static final int ASSERT = android.util.Log.ASSERT;

  // Stores the beginning of the LogNode topology.
  private static LogNode mLogNode;

  /**
   * Returns the next LogNode in the linked list.
   */
  public static LogNode getLogNode() {
    return mLogNode;
  }

  /**
   * Sets the LogNode data will be sent to.
   */
  public static void setLogNode(LogNode node) {
    mLogNode = node;
  }

  /**
   * Instructs the LogNode to print the log data provided. Other LogNodes can
   * be chained to the end of the LogNode as desired.
   *
   * @param priority Log level of the data being logged. Verbose, Error, etc.
   * @param tag      Tag for for the log data. Can be used to organize log statements.
   * @param msg      The actual message to be logged.
   * @param tr       If an exception was thrown, this can be sent along for the logging facilities
   *                 to extract and print useful information.
   */
  public static void println(int priority, String tag, String msg, Throwable tr) {
    if (mLogNode != null) {
      mLogNode.println(priority, tag, msg, tr);
    }
  }

  /**
   * Instructs the LogNode to print the log data provided. Other LogNodes can
   * be chained to the end of the LogNode as desired.
   *
   * @param priority Log level of the data being logged. Verbose, Error, etc.
   * @param tag      Tag for for the log data. Can be used to organize log statements.
   * @param msg      The actual message to be logged. The actual message to be logged.
   */
  public static void println(int priority, String tag, String msg) {
    println(priority, tag, msg, null);
  }

  /**
   * Prints a message at VERBOSE priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void v(String tag, String msg, Throwable tr) {
    println(VERBOSE, tag, msg, tr);
  }

  /**
   * Prints a message at VERBOSE priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   */
  public static void v(String tag, String msg) {
    v(tag, msg, null);
  }


  /**
   * Prints a message at DEBUG priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void d(String tag, String msg, Throwable tr) {
    println(DEBUG, tag, msg, tr);
  }

  /**
   * Prints a message at DEBUG priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   */
  public static void d(String tag, String msg) {
    d(tag, msg, null);
  }

  /**
   * Prints a message at INFO priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void i(String tag, String msg, Throwable tr) {
    println(INFO, tag, msg, tr);
  }

  /**
   * Prints a message at INFO priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   */
  public static void i(String tag, String msg) {
    i(tag, msg, null);
  }

  /**
   * Prints a message at WARN priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void w(String tag, String msg, Throwable tr) {
    println(WARN, tag, msg, tr);
  }

  /**
   * Prints a message at WARN priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   */
  public static void w(String tag, String msg) {
    w(tag, msg, null);
  }

  /**
   * Prints a message at WARN priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void w(String tag, Throwable tr) {
    w(tag, null, tr);
  }

  /**
   * Prints a message at ERROR priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void e(String tag, String msg, Throwable tr) {
    println(ERROR, tag, msg, tr);
  }

  /**
   * Prints a message at ERROR priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   */
  public static void e(String tag, String msg) {
    e(tag, msg, null);
  }

  /**
   * Prints a message at ASSERT priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void wtf(String tag, String msg, Throwable tr) {
    println(ASSERT, tag, msg, tr);
  }

  /**
   * Prints a message at ASSERT priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param msg The actual message to be logged.
   */
  public static void wtf(String tag, String msg) {
    wtf(tag, msg, null);
  }

  /**
   * Prints a message at ASSERT priority.
   *
   * @param tag Tag for for the log data. Can be used to organize log statements.
   * @param tr  If an exception was thrown, this can be sent along for the logging facilities
   *            to extract and print useful information.
   */
  public static void wtf(String tag, Throwable tr) {
    wtf(tag, null, tr);
  }
}
Java Source Code List
