/*
    *  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.normalizers;
  
  
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.model.constants.SchemaConstants;
  import org.apache.directory.api.ldap.model.entry.StringValue;
  import org.apache.directory.api.ldap.model.entry.Value;
  import org.apache.directory.api.ldap.model.exception.LdapException;
  import org.apache.directory.api.ldap.model.exception.LdapOtherException;
  import org.apache.directory.api.ldap.model.schema.Normalizer;
  import org.apache.directory.api.ldap.model.schema.SchemaManager;
  import org.apache.directory.api.ldap.model.schema.syntaxCheckers.NumericOidSyntaxChecker;
  
  
  /**
   * A name or numeric id normalizer.  Needs an OID registry to operate properly.
   * The OID registry is injected into this class after instantiation if a 
   * setRegistries(Registries) method is exposed.
   * 
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  @SuppressWarnings("serial")
  public class NameOrNumericIdNormalizer extends Normalizer
  {
      private NumericOidSyntaxChecker checker = new NumericOidSyntaxChecker();
  
      /** A reference to the schema manager used to normalize the Name */
      private SchemaManager schemaManager;
  
      /** A static instance of this normalizer */
      public static final NameOrNumericIdNormalizer INSTANCE = new NameOrNumericIdNormalizer();
  
  
      /**
       * Creates a new instance of GeneralizedTimeNormalizer.
       */
      public NameOrNumericIdNormalizer()
      {
          super( SchemaConstants.NAME_OR_NUMERIC_ID_MATCH_OID );
      }
  
  
      /**
       * {@inheritDoc} 
       */
      public Value<?> normalize( Value<?> value ) throws LdapException
      {
          if ( value == null )
          {
              return null;
          }
  
          String strValue = value.getString();
  
          if ( strValue.length() == 0 )
          {
              return new StringValue( "" );
          }
  
          // if value is a numeric id then return it as is
          if ( checker.isValidSyntax( strValue ) )
          {
              return value;
          }
  
          // if it is a name we need to do a lookup
          String oid = schemaManager.getRegistries().getOid( strValue );
  
          if ( oid != null )
          {
              return new StringValue( oid );
          }
  
          // if all else fails
          throw new LdapOtherException( I18n.err( I18n.ERR_04225, value ) );
      }
  
  
      /**
      * {@inheritDoc} 
      */
     public String normalize( String value ) throws LdapException
     {
         if ( value == null )
         {
             return null;
         }
 
         if ( value.length() == 0 )
         {
             return value;
         }
 
         // if value is a numeric id then return it as is
         if ( checker.isValidSyntax( value ) )
         {
             return value;
         }
 
         // if it is a name we need to do a lookup
         String oid = schemaManager.getRegistries().getOid( value );
 
         if ( oid != null )
         {
             return oid;
         }
 
         // if all else fails
         throw new LdapOtherException( I18n.err( I18n.ERR_04226, value ) );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public void setSchemaManager( SchemaManager schemaManager )
     {
         this.schemaManager = schemaManager;
     }
 }