/*
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF licenses this file
    *  to you 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. 
   *  
   */
  package org.apache.directory.api.ldap.model.schema.syntaxCheckers;
  
  
  import org.apache.directory.api.ldap.model.constants.SchemaConstants;
  import org.apache.directory.api.ldap.model.schema.SyntaxChecker;
  import org.apache.directory.api.util.Strings;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A syntax checker which checks to see if an attributeType's type is either: 
   * userApplications
   * directoryOperation
   * distributedOperation
   * dSAOperation
  .*  The case is NOT ignored.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  @SuppressWarnings("serial")
  public class AttributeTypeUsageSyntaxChecker extends SyntaxChecker
  {
      /** A logger for this class */
      private static final Logger LOG = LoggerFactory.getLogger( AttributeTypeUsageSyntaxChecker.class );
  
  
      /**
       * 
       * Creates a new instance of AttributeTypeUsageSyntaxChecker.
       *
       */
      public AttributeTypeUsageSyntaxChecker()
      {
          super( SchemaConstants.ATTRIBUTE_TYPE_USAGE_SYNTAX );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public boolean isValidSyntax( Object value )
      {
          String strValue = null;
  
          if ( value == null )
          {
              LOG.debug( "Syntax invalid for 'null'" );
              return false;
          }
  
          if ( value instanceof String )
          {
              strValue = ( String ) value;
          }
          else if ( value instanceof byte[] )
          {
              strValue = Strings.utf8ToString( ( byte[] ) value );
          }
          else
          {
              strValue = value.toString();
          }
  
          if ( ( strValue.length() < "userApplications".length() )
              || ( strValue.length() > "userApplications".length() ) )
          {
              LOG.debug( "Syntax invalid for '{}'", value );
              return false;
          }
  
          char ch = strValue.charAt( 0 );
  
          switch ( ch )
          {
              case ( 'd' ):
                  if ( "dSAOperation".equals( strValue )
                      || "directoryOperation".equals( strValue )
                      || "distributedOperation".equals( strValue ) )
                  {
                     LOG.debug( "Syntax valid for '{}'", value );
                     return true;
                 }
 
                 LOG.debug( "Syntax invalid for '{}'", value );
                 return false;
 
             case ( 'u' ):
                 boolean comp = "userApplications".equals( strValue );
 
                 if ( comp )
                 {
                     LOG.debug( "Syntax valid for '{}'", value );
                 }
                 else
                 {
                     LOG.debug( "Syntax invalid for '{}'", value );
 
                 }
 
                 return comp;
 
             default:
                 LOG.debug( "Syntax invalid for '{}'", value );
                 return false;
         }
     }
 }