Android Open Source - NavigationDrawer Log Wrapper

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012 The Android Open Source Project
 */* ww w  . java2  s.  c o m*/
 * 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;

import android.util.Log;

/**
 * Helper class which wraps Android's native Log utility in the Logger interface.  This way
 * normal DDMS output can be one of the many targets receiving and outputting logs simultaneously.
 */
public class LogWrapper implements LogNode {

  // For piping:  The next node to receive Log data after this one has done its work.
  private LogNode mNext;

  /**
   * Returns the next LogNode in the linked list.
   */
  public LogNode getNext() {
    return mNext;
  }

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

  /**
   * Prints data out to the console using Android's native log mechanism.
   *
   * @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.
   * @param tr       If an exception was thrown, this can be sent along for the logging facilities
   *                 to extract and print useful information.
   */
  @Override
  public void println(int priority, String tag, String msg, Throwable tr) {
    // There actually are log methods that don't take a msg parameter.  For now,
    // if that's the case, just convert null to the empty string and move on.
    String useMsg = msg;
    if (useMsg == null) {
      useMsg = "";
    }

    // If an exeption was provided, convert that exception to a usable string and attach
    // it to the end of the msg method.
    if (tr != null) {
      msg += "\n" + Log.getStackTraceString(tr);
    }

    // This is functionally identical to Log.x(tag, useMsg);
    // For instance, if priority were Log.VERBOSE, this would be the same as Log.v(tag, useMsg)
    Log.println(priority, tag, useMsg);

    // If this isn't the last node in the chain, move things along.
    if (mNext != null) {
      mNext.println(priority, tag, msg, tr);
    }
  }
}

Java Source Code List

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