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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 2009-2022 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright 2009-2022 Ping Identity Corporation
 *
 * 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.
 */
/*
 * Copyright (C) 2009-2022 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.asn1;



import java.io.Serializable;

import com.unboundid.util.Mutable;
import com.unboundid.util.NotNull;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;



/**
 * This class provides a data structure which is used in the course of writing
 * an ASN.1 sequence to an ASN.1 buffer.  It keeps track of the position at
 * which the sequence value begins so that the appropriate length may be
 * inserted after all embedded elements have been added.  The {@link #end}
 * method must be called after all elements have been added to ensure that the
 * length is properly computed and inserted into the associated buffer.
 */
@Mutable()
@ThreadSafety(level=ThreadSafetyLevel.NOT_THREADSAFE)
public final class ASN1BufferSequence
       implements Serializable
{
  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 7219098399193345629L;



  // The ASN.1 buffer with which the sequence is associated.
  @NotNull private final ASN1Buffer buffer;

  // The position in the ASN.1 buffer at which the first sequence value begins.
  private final int valueStartPos;



  /**
   * Creates a new instance of this class for the provided ASN.1 buffer.
   *
   * @param  buffer  The ASN.1 buffer with which this object will be associated.
   */
  ASN1BufferSequence(@NotNull final ASN1Buffer buffer)
  {
    this.buffer = buffer;

    valueStartPos = buffer.length();
  }



  /**
   * Updates the associated ASN.1 buffer to indicate that all sequence elements
   * have been added and that the appropriate length should be inserted.
   */
  public void end()
  {
    buffer.endSequenceOrSet(valueStartPos);
  }
}