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The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication. This package contains the Commercial Edition of the LDAP SDK, which includes all of the general-purpose functionality contained in the Standard Edition, plus additional functionality specific to UnboundID server products.

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/*
 * Copyright 2009-2017 UnboundID Corp.
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2015-2017 UnboundID Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see .
 */
package com.unboundid.ldap.sdk.unboundidds.logs;



import java.io.BufferedReader;
import java.io.Closeable;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;

import com.unboundid.util.NotMutable;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;



/**
 * This class provides a mechanism for reading message from a Directory Server
 * error log.
 * 

 * 
 *   NOTE:  This class is part of the Commercial Edition of the UnboundID
 *   LDAP SDK for Java.  It is not available for use in applications that
 *   include only the Standard Edition of the LDAP SDK, and is not supported for
 *   use in conjunction with non-UnboundID products.
 * 
 */
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ErrorLogReader
       implements Closeable
{
  // The reader used to read the contents of the log file.
  private final BufferedReader reader;



  /**
   * Creates a new error log reader that will read messages from the specified
   * log file.
   *
   * @param  path  The path of the log file to read.
   *
   * @throws  IOException  If a problem occurs while opening the file for
   *                       reading.
   */
  public ErrorLogReader(final String path)
         throws IOException
  {
    reader = new BufferedReader(new FileReader(path));
  }



  /**
   * Creates a new error log reader that will read messages from the specified
   * log file.
   *
   * @param  file  The log file to read.
   *
   * @throws  IOException  If a problem occurs while opening the file for
   *                       reading.
   */
  public ErrorLogReader(final File file)
         throws IOException
  {
    reader = new BufferedReader(new FileReader(file));
  }



  /**
   * Creates a new error log reader that will read messages using the provided
   * {@code Reader} object.
   *
   * @param  reader  The reader to use to read log messages.
   */
  public ErrorLogReader(final Reader reader)
  {
    if (reader instanceof BufferedReader)
    {
      this.reader = (BufferedReader) reader;
    }
    else
    {
      this.reader = new BufferedReader(reader);
    }
  }



  /**
   * Reads the next error log message from the log file.
   *
   * @return  The error log message read from the log file, or {@code null} if
   *          there are no more messages to be read.
   *
   * @throws  IOException  If an error occurs while trying to read from the
   *                       file.
   *
   * @throws  LogException  If an error occurs while trying to parse the log
   *                        message.
   */
  public ErrorLogMessage read()
         throws IOException, LogException
  {
    while (true)
    {
      final String line = reader.readLine();
      if (line == null)
      {
        return null;
      }

      if ((line.length() == 0) || (line.charAt(0) == '#'))
      {
        continue;
      }

      return new ErrorLogMessage(line);
    }
  }



  /**
   * Closes this error log reader.
   *
   * @throws  IOException  If a problem occurs while closing the reader.
   */
  public void close()
         throws IOException
  {
    reader.close();
  }
}