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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 2017-2018 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2017-2018 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.asn1;



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

import static com.unboundid.asn1.ASN1Messages.*;



/**
 * This class provides an ASN.1 printable string element that can hold any
 * empty or non-empty string comprised only of the characters listed below.
 * 
 *   The uppercase ASCII letters A through Z.
 *   The lowercase ASCII letters a through z.
 *   The ASCII digits 0 through 9.
 *   The ASCII space.
 *   The ASCII apostrophe (aka single quote).
 *   The ASCII left parenthesis.
 *   The ASCII right parenthesis.
 *   The ASCII plus sign.
 *   The ASCII comma.
 *   The ASCII minus sign (aka hyphen).
 *   The ASCII period (aka full stop).
 *   The ASCII forward slash (aka solidus).
 *   The ASCII colon.
 *   The ASCII equal sign.
 *   The ASCII question mark.
 * 
 */
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ASN1PrintableString
       extends ASN1Element
{
  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 7489436088285132189L;



  // The string value for this element.
  private final String stringValue;



  /**
   * Creates a new ASN.1 printable string element with the default BER type and
   * the provided value.
   *
   * @param  stringValue  The string value to use for this element.  It may be
   *                      {@code null} or empty if the value should be empty.
   *                      It must only contain characters allowed in printable
   *                      strings.
   *
   * @throws  ASN1Exception  If the provided string does not represent a valid
   *                         printable string.
   */
  public ASN1PrintableString(final String stringValue)
         throws ASN1Exception
  {
    this(ASN1Constants.UNIVERSAL_PRINTABLE_STRING_TYPE, stringValue);
  }



  /**
   * Creates a new ASN.1 printable string element with the specified BER type
   * and the provided value.
   *
   * @param  type         The BER type for this element.
   * @param  stringValue  The string value to use for this element.  It may be
   *                      {@code null} or empty if the value should be empty.
   *                      It must only contain characters allowed in printable
   *                      strings.
   *
   * @throws  ASN1Exception  If the provided string does not represent a valid
   *                         printable string.
   */
  public ASN1PrintableString(final byte type, final String stringValue)
         throws ASN1Exception
  {
    this(type, stringValue, StaticUtils.getBytes(stringValue));
  }



  /**
   * Creates a new ASN.1 printable string element with the specified BER type
   * and the provided value.
   *
   * @param  type          The BER type for this element.
   * @param  stringValue   The string value to use for this element.  It may be
   *                       {@code null} or empty if the value should be empty.
   *                       It must only contain characters allowed in printable
   *                       strings.
   * @param  encodedValue  The bytes that comprise the encoded element value.
   *
   * @throws  ASN1Exception  If the provided string does not represent a valid
   *                         printable string.
   */
  private ASN1PrintableString(final byte type, final String stringValue,
                              final byte[] encodedValue)
          throws ASN1Exception
  {
    super(type, encodedValue);

    if (stringValue == null)
    {
      this.stringValue = "";
    }
    else
    {
      this.stringValue = stringValue;
      if (! StaticUtils.isPrintableString(encodedValue))
      {
        throw new ASN1Exception(
             ERR_PRINTABLE_STRING_DECODE_VALUE_NOT_PRINTABLE.get());
      }
    }
  }



  /**
   * Retrieves the string value for this element.
   *
   * @return  The string value for this element.
   */
  public String stringValue()
  {
    return stringValue;
  }



  /**
   * Decodes the contents of the provided byte array as a printable string
   * element.
   *
   * @param  elementBytes  The byte array to decode as an ASN.1 printable string
   *                       element.
   *
   * @return  The decoded ASN.1 printable string element.
   *
   * @throws  ASN1Exception  If the provided array cannot be decoded as a
   *                         printable string element.
   */
  public static ASN1PrintableString decodeAsPrintableString(
                                         final byte[] elementBytes)
         throws ASN1Exception
  {
    try
    {
      int valueStartPos = 2;
      int length = (elementBytes[1] & 0x7F);
      if (length != elementBytes[1])
      {
        final int numLengthBytes = length;

        length = 0;
        for (int i=0; i < numLengthBytes; i++)
        {
          length <<= 8;
          length |= (elementBytes[valueStartPos++] & 0xFF);
        }
      }

      if ((elementBytes.length - valueStartPos) != length)
      {
        throw new ASN1Exception(ERR_ELEMENT_LENGTH_MISMATCH.get(length,
                                     (elementBytes.length - valueStartPos)));
      }

      final byte[] elementValue = new byte[length];
      System.arraycopy(elementBytes, valueStartPos, elementValue, 0, length);

      return new ASN1PrintableString(elementBytes[0],
           StaticUtils.toUTF8String(elementValue), elementValue);
    }
    catch (final ASN1Exception ae)
    {
      Debug.debugException(ae);
      throw ae;
    }
    catch (final Exception e)
    {
      Debug.debugException(e);
      throw new ASN1Exception(ERR_ELEMENT_DECODE_EXCEPTION.get(e), e);
    }
  }



  /**
   * Decodes the provided ASN.1 element as a printable string element.
   *
   * @param  element  The ASN.1 element to be decoded.
   *
   * @return  The decoded ASN.1 printable string element.
   *
   * @throws  ASN1Exception  If the provided element cannot be decoded as a
   *                         printable string element.
   */
  public static ASN1PrintableString decodeAsPrintableString(
                                         final ASN1Element element)
         throws ASN1Exception
  {
    final byte[] elementValue = element.getValue();
    return new ASN1PrintableString(element.getType(),
         StaticUtils.toUTF8String(elementValue), elementValue);
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  public void toString(final StringBuilder buffer)
  {
    buffer.append(stringValue);
  }
}