/*
 * 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 org.opends.sdk.ByteSequence;
import org.opends.sdk.ByteString;

import com.sun.opends.sdk.util.StaticUtils;



/**
 * This class implements the telephoneNumberSubstringsMatch matching
 * rule defined in X.520 and referenced in RFC 2252. Note that although
 * the specification calls for a very rigorous format, this is widely
 * ignored so this matching will compare only numeric digits and strip
 * out everything else.
 */
final class TelephoneNumberSubstringMatchingRuleImpl extends
    AbstractSubstringMatchingRuleImpl
{
  public ByteString normalizeAttributeValue(Schema schema,
      ByteSequence value)
  {
    final String valueString = value.toString();
    final int valueLength = valueString.length();
    final StringBuilder buffer = new StringBuilder(valueLength);

    // Iterate through the characters in the value and filter out
    // everything that isn't a digit.
    for (int i = 0; i < valueLength; i++)
    {
      final char c = valueString.charAt(i);
      if (StaticUtils.isDigit(c))
      {
        buffer.append(c);
      }
    }

    return ByteString.valueOf(buffer.toString());
  }
}