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• ASN1Boolean.java

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com.unboundid.asn1.ASN1Boolean Maven / Gradle / Ivy

/*
 * Copyright 2007-2017 UnboundID Corp.
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2008-2017 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.asn1;



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

import static com.unboundid.asn1.ASN1Constants.*;
import static com.unboundid.asn1.ASN1Messages.*;
import static com.unboundid.util.Debug.*;



/**
 * This class provides an ASN.1 Boolean element, whose value is a single byte
 * and represents either "TRUE" or "FALSE".  A value whose only byte is 0x00 is
 * considered "false", while any other single-byte value is considered "true".
 */
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ASN1Boolean
       extends ASN1Element
{
  /**
   * A pre-allocated ASN.1 Boolean element with the universal Boolean BER type
   * and a value of "FALSE".
   */
  public static final ASN1Boolean UNIVERSAL_BOOLEAN_FALSE_ELEMENT =
         new ASN1Boolean(false);



  /**
   * A pre-allocated ASN.1 Boolean element with the universal Boolean BER type
   * and a value of "TRUE".
   */
  public static final ASN1Boolean UNIVERSAL_BOOLEAN_TRUE_ELEMENT =
         new ASN1Boolean(true);



  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 7131700816847855524L;



  // The boolean value for this element.
  private final boolean booleanValue;



  /**
   * Creates a new ASN.1 Boolean element with the default BER type and the
   * provided boolean value.
   *
   * @param  booleanValue  The boolean value to use for this element.
   */
  public ASN1Boolean(final boolean booleanValue)
  {
    super(UNIVERSAL_BOOLEAN_TYPE,
          (booleanValue ? BOOLEAN_VALUE_TRUE : BOOLEAN_VALUE_FALSE));

    this.booleanValue = booleanValue;
  }



  /**
   * Creates a new ASN.1 Boolean element with the specified BER type and the
   * provided boolean value.
   *
   * @param  type          The BER type to use for this element.
   * @param  booleanValue  The boolean value to use for this element.
   */
  public ASN1Boolean(final byte type, final boolean booleanValue)
  {
    super(type, (booleanValue ? BOOLEAN_VALUE_TRUE : BOOLEAN_VALUE_FALSE));

    this.booleanValue = booleanValue;
  }



  /**
   * Creates a new ASN.1 Boolean element with the provided information.
   *
   * @param  type          The BER type to use for this element.
   * @param  booleanValue  The boolean value to use for this element.
   * @param  value         The pre-encoded value to use for this element.
   */
  private ASN1Boolean(final byte type, final boolean booleanValue,
                      final byte[] value)
  {
    super(type, value);

    this.booleanValue = booleanValue;
  }



  /**
   * Retrieves the boolean value for this element.
   *
   * @return  {@code true} if this element has a value of "TRUE", or
   *          {@code false} if it has a value of "FALSE".
   */
  public boolean booleanValue()
  {
    return booleanValue;
  }



  /**
   * Decodes the contents of the provided byte array as a Boolean element.
   *
   * @param  elementBytes  The byte array to decode as an ASN.1 Boolean element.
   *
   * @return  The decoded ASN.1 Boolean element.
   *
   * @throws  ASN1Exception  If the provided array cannot be decoded as a
   *                         Boolean element.
   */
  public static ASN1Boolean decodeAsBoolean(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)));
      }

      if (length != 1)
      {
        throw new ASN1Exception(ERR_BOOLEAN_INVALID_LENGTH.get());
      }

      final byte[] value = { elementBytes[valueStartPos] };
      final boolean booleanValue = (value[0] != 0x00);
      return new ASN1Boolean(elementBytes[0], booleanValue, value);
    }
    catch (final ASN1Exception ae)
    {
      debugException(ae);
      throw ae;
    }
    catch (final Exception e)
    {
      debugException(e);
      throw new ASN1Exception(ERR_ELEMENT_DECODE_EXCEPTION.get(e), e);
    }
  }



  /**
   * Decodes the provided ASN.1 element as a Boolean element.
   *
   * @param  element  The ASN.1 element to be decoded.
   *
   * @return  The decoded ASN.1 Boolean element.
   *
   * @throws  ASN1Exception  If the provided element cannot be decoded as a
   *                         Boolean element.
   */
  public static ASN1Boolean decodeAsBoolean(final ASN1Element element)
         throws ASN1Exception
  {
    final byte[] value = element.getValue();
    if (value.length != 1)
    {
      throw new ASN1Exception(ERR_BOOLEAN_INVALID_LENGTH.get());
    }

    if (value[0] == 0x00)
    {
      return new ASN1Boolean(element.getType(), false, value);
    }
    else
    {
      return new ASN1Boolean(element.getType(), true, value);
    }
  }



  /**
   * Appends a string representation of this ASN.1 element to the provided
   * buffer.
   *
   * @param  buffer  The buffer to which to append the information.
   */
  @Override
  public void toString(final StringBuilder buffer)
  {
    buffer.append(booleanValue);
  }
}