/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE
 * or https://OpenDS.dev.java.net/OpenDS.LICENSE.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE.  If applicable,
 * add the following below this CDDL HEADER, with the fields enclosed
 * by brackets "[]" replaced with your own identifying information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2009 Sun Microsystems, Inc.
 */

package org.opends.sdk.schema;



import static com.sun.opends.sdk.messages.Messages.WARN_ATTR_SYNTAX_BIT_STRING_INVALID_BIT;
import static com.sun.opends.sdk.messages.Messages.WARN_ATTR_SYNTAX_BIT_STRING_NOT_QUOTED;
import static com.sun.opends.sdk.messages.Messages.WARN_ATTR_SYNTAX_BIT_STRING_TOO_SHORT;
import static org.opends.sdk.schema.SchemaConstants.EMR_BIT_STRING_OID;
import static org.opends.sdk.schema.SchemaConstants.SYNTAX_BIT_STRING_NAME;

import org.opends.sdk.ByteSequence;
import org.opends.sdk.LocalizableMessageBuilder;



/**
 * This class defines the bit string attribute syntax, which is comprised of a
 * string of binary digits surrounded by single quotes and followed by a capital
 * letter "B" (e.g., '101001'B).
 */
final class BitStringSyntaxImpl extends AbstractSyntaxImpl
{
  @Override
  public String getEqualityMatchingRule()
  {
    return EMR_BIT_STRING_OID;
  }



  public String getName()
  {
    return SYNTAX_BIT_STRING_NAME;
  }



  public boolean isHumanReadable()
  {
    return true;
  }



  /**
   * Indicates whether the provided value is acceptable for use in an attribute
   * with this syntax. If it is not, then the reason may be appended to the
   * provided buffer.
   *
   * @param schema
   *          The schema in which this syntax is defined.
   * @param value
   *          The value for which to make the determination.
   * @param invalidReason
   *          The buffer to which the invalid reason should be appended.
   * @return <CODE>true</CODE> if the provided value is acceptable for use with
   *         this syntax, or <CODE>false</CODE> if not.
   */
  public boolean valueIsAcceptable(final Schema schema,
      final ByteSequence value, final LocalizableMessageBuilder invalidReason)
  {
    final String valueString = value.toString().toUpperCase();

    final int length = valueString.length();
    if (length < 3)
    {
      invalidReason.append(WARN_ATTR_SYNTAX_BIT_STRING_TOO_SHORT.get(value
          .toString()));
      return false;
    }

    if (valueString.charAt(0) != '\'' || valueString.charAt(length - 2) != '\''
        || valueString.charAt(length - 1) != 'B')
    {
      invalidReason.append(WARN_ATTR_SYNTAX_BIT_STRING_NOT_QUOTED.get(value
          .toString()));
      return false;
    }

    for (int i = 1; i < length - 2; i++)
    {
      switch (valueString.charAt(i))
      {
      case '0':
      case '1':
        // These characters are fine.
        break;
      default:
        invalidReason.append(WARN_ATTR_SYNTAX_BIT_STRING_INVALID_BIT.get(value
            .toString(), String.valueOf(valueString.charAt(i))));
        return false;
      }
    }

    // If we've gotten here, then everything is fine.
    return true;
  }
}