Android Open Source - prim-ftpd Android Logger Factory

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Created 21.10.2009/*w w w . j a va 2 s  . c  o  m*/
 *
 * Copyright (c) 2009 SLF4J.ORG
 *
 * 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 java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;

import org.slf4j.ILoggerFactory;

/**
 * An implementation of {@link ILoggerFactory} which always returns
 * {@link AndroidLogger} instances.
 *
 * @author Thorsten Möler
 * @version $Rev:$; $Author:$; $Date:$
 */
public class AndroidLoggerFactory implements ILoggerFactory
{
  private final Map<String, AndroidLogger> loggerMap;

  static final int TAG_MAX_LENGTH = 23; // tag names cannot be longer on Android platform
                                         // see also android/system/core/include/cutils/property.h
                                         // and android/frameworks/base/core/jni/android_util_Log.cpp

  public AndroidLoggerFactory()
  {
    loggerMap = new HashMap<String, AndroidLogger>();
  }

  /* @see org.slf4j.ILoggerFactory#getLogger(java.lang.String) */
  @Override
  public AndroidLogger getLogger(final String name)
  {
    final String actualName = forceValidName(name); // fix for bug #173

    AndroidLogger slogger = null;
    // protect against concurrent access of the loggerMap
    synchronized (this)
    {
      slogger = loggerMap.get(actualName);
      if (slogger == null)
      {
        if (!actualName.equals(name)) {
//          Log.i(AndroidLoggerFactory.class.getSimpleName(),
//            "Logger name '" + name + "' exceeds maximum length of " + TAG_MAX_LENGTH +
//            " characters, using '" + actualName + "' instead.");
        }

        slogger = new AndroidLogger(actualName);
        loggerMap.put(actualName, slogger);
      }
    }
    return slogger;
  }

  /**
   * Trim name in case it exceeds maximum length of {@value #TAG_MAX_LENGTH} characters.
   */
  private final String forceValidName(String name)
  {
    if (name != null && name.length() > TAG_MAX_LENGTH)
    {
      final StringTokenizer st = new StringTokenizer(name, ".");
      if (st.hasMoreTokens()) // note that empty tokens are skipped, i.e., "aa..bb" has tokens "aa", "bb"
      {
        final StringBuilder sb = new StringBuilder();
        String token;
        do
        {
          token = st.nextToken();
          if (token.length() == 1) // token of one character appended as is
          {
            sb.append(token);
            sb.append('.');
          }
          else if (st.hasMoreTokens()) // truncate all but the last token
          {
            sb.append(token.charAt(0));
            sb.append("*.");
          }
          else // last token (usually class name) appended as is
          {
            sb.append(token);
          }
        } while (st.hasMoreTokens());

        name = sb.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
      if (name.length() > TAG_MAX_LENGTH)
      {
        name = name.substring(0, TAG_MAX_LENGTH - 1) + '*';
      }
    }
    return name;
  }
}

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