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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 Standard Edition of the LDAP SDK, which is a complete, general-purpose library for communicating with LDAPv3 directory servers.

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/*
 * Copyright 2008-2018 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2008-2018 Ping Identity Corporation
 *
 * 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.util;



import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Random;

import static com.unboundid.util.UtilityMessages.*;



/**
 * This class defines an HTTP value pattern component, which may be used provide
 * string values read from a specified remote file accessed via HTTP.
 */
final class HTTPValuePatternComponent
      extends ValuePatternComponent
{
  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 8879412445617836376L;



  // The lines that make up the data file.
  private final String[] lines;

  // The random number generator that will be used to seed the thread-local
  // generators.
  private final Random seedRandom;

  // The random number generator that will be used by this component.
  private final ThreadLocal random;



  /**
   * Creates a new HTTP value pattern component with the provided information.
   *
   * @param  url   The HTTP URL to the file from which to read the data.
   * @param  seed  The value that will be used to seed the initial random number
   *               generator.
   *
   * @throws  IOException  If a problem occurs while reading data from the
   *                       specified HTTP URL.
   */
  HTTPValuePatternComponent(final String url, final long seed)
       throws IOException
  {
    // Create the random number generators that will be used.
    seedRandom = new Random(seed);
    random     = new ThreadLocal<>();


    final ArrayList lineList = new ArrayList<>(100);
    final URL parsedURL = new URL(url);
    final HttpURLConnection urlConnection =
         (HttpURLConnection) parsedURL.openConnection();
    final BufferedReader reader = new BufferedReader(new InputStreamReader(
         urlConnection.getInputStream()));

    try
    {
      while (true)
      {
        final String line = reader.readLine();
        if (line == null)
        {
          break;
        }

        lineList.add(line);
      }
    }
    finally
    {
      reader.close();
    }

    if (lineList.isEmpty())
    {
      throw new IOException(ERR_VALUE_PATTERN_COMPONENT_EMPTY_FILE.get());
    }

    lines = new String[lineList.size()];
    lineList.toArray(lines);
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  void append(final StringBuilder buffer)
  {
    Random r = random.get();
    if (r == null)
    {
      r = new Random(seedRandom.nextLong());
      random.set(r);
    }

    buffer.append(lines[r.nextInt(lines.length)]);
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  boolean supportsBackReference()
  {
    return true;
  }
}