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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 2009-2018 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2009-2018 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.ldap.sdk;



import java.io.Serializable;
import java.util.concurrent.ConcurrentHashMap;

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



/**
 * This class provides a data structure for holding a compact attribute, which
 * will only contain the name and raw values for the attribute.
 */
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
final class CompactAttribute
      implements Serializable
{
  /**
   * The maximum number of cached names to maintain.
   */
  private static final int MAX_CACHED_NAMES = 1000;



  /**
   * A set of cached attribute names to conserve space.
   */
  private static final ConcurrentHashMap cachedNames =
       new ConcurrentHashMap<>(
            StaticUtils.computeMapCapacity(MAX_CACHED_NAMES));



  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 9056952830029621727L;



  // The set of values for this attribute.
  private final byte[][] values;

  // The name for this attribute.
  private final String name;



  /**
   * Creates a compact attribute from the provided attribute.
   *
   * @param  attribute  The attribute to use to create this compact attribute.
   */
  CompactAttribute(final Attribute attribute)
  {
    name = internName(attribute.getName());
    values = attribute.getValueByteArrays();
  }



  /**
   * Retrieves an internalized representation of the provided attribute name.
   * It will be a cached name, so that the same string can be used for the same
   * attribute name rather than multiple equivalent strings.
   *
   * @param  name  The name to be internalized.
   *
   * @return  The internalized representation of the provided name.
   */
  private static String internName(final String name)
  {
    String s = cachedNames.get(name);
    if (s == null)
    {
      if (cachedNames.size() >= MAX_CACHED_NAMES)
      {
        cachedNames.clear();
      }

      cachedNames.put(name, name);
      s = name;
    }

    return s;
  }



  /**
   * Retrieves the name for this attribute.
   *
   * @return  The name for this attribute.
   */
  String getName()
  {
    return name;
  }



  /**
   * Retrieves the set of values for this attribute as byte arrays..
   *
   * @return  The set of values for this attribute as byte arrays.
   */
  byte[][] getByteValues()
  {
    return values;
  }



  /**
   * Retrieves the set of values for this attribute as strings..
   *
   * @return  The set of values for this attribute as strings.
   */
  String[] getStringValues()
  {
    final String[] stringValues = new String[values.length];
    for (int i=0; i < values.length; i++)
    {
      stringValues[i] = StaticUtils.toUTF8String(values[i]);
    }

    return stringValues;
  }



  /**
   * Retrieves an attribute that is equivalent to this compact attribute.
   *
   * @return  An attribute that is equivalent to this compact attribute.
   */
  Attribute toAttribute()
  {
    return new Attribute(name, values);
  }
}