/*
    *  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;
  
  
  import java.util.List;
  import java.util.Map;
  
  import org.apache.directory.api.ldap.model.constants.MetaSchemaConstants;
  import org.apache.directory.api.ldap.model.constants.SchemaConstants;
  import org.apache.directory.api.ldap.model.entry.Attribute;
  import org.apache.directory.api.ldap.model.entry.DefaultAttribute;
  import org.apache.directory.api.ldap.model.entry.DefaultEntry;
  import org.apache.directory.api.ldap.model.entry.Entry;
  import org.apache.directory.api.ldap.model.exception.LdapException;
  import org.apache.directory.api.ldap.model.schema.registries.Schema;
  import org.apache.directory.api.util.DateUtils;
  
  
  /**
   * A factory that generates an entry using the meta schema for schema
   * elements.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class AttributesFactory
  {
      /**
       * Get a SchemaObject as an Entry
       *
       * @param obj The schema oobject to convert
       * @param schema The schema which this object belongs to
       * @param schemaManager The SchemaManager
       * @return The converted schema object as an Entry
       * @throws LdapException If we can't convert teh schema object
       */
      public Entry getAttributes( SchemaObject obj, Schema schema, SchemaManager schemaManager ) throws LdapException
      {
          if ( obj instanceof LdapSyntax )
          {
              return convert( ( LdapSyntax ) obj, schema, schemaManager );
          }
          else if ( obj instanceof MatchingRule )
          {
              return convert( ( MatchingRule ) obj, schema, schemaManager );
          }
          else if ( obj instanceof AttributeType )
          {
              return convert( ( AttributeType ) obj, schema, schemaManager );
          }
          else if ( obj instanceof ObjectClass )
          {
              return convert( ( ObjectClass ) obj, schema, schemaManager );
          }
          else if ( obj instanceof MatchingRuleUse )
          {
              return convert( ( MatchingRuleUse ) obj, schema, schemaManager );
          }
          else if ( obj instanceof DitStructureRule )
          {
              return convert( ( DitStructureRule ) obj, schema, schemaManager );
          }
          else if ( obj instanceof DitContentRule )
          {
              return convert( ( DitContentRule ) obj, schema, schemaManager );
          }
          else if ( obj instanceof NameForm )
          {
              return convert( ( NameForm ) obj, schema, schemaManager );
          }
  
          throw new IllegalArgumentException( "nknown SchemaObject type: " + obj.getClass() );
      }
  
  
      /**
       * Converts a Schema to an Entry
       * 
       * @param schema The Schema to convert
       * @param schemaManager The SchemaManager
       * @return An Entry containing the converted Schema
       * @throws LdapException If the conversion failed
      */
     public Entry convert( Schema schema, SchemaManager schemaManager ) throws LdapException
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_SCHEMA_OC );
         entry.put( SchemaConstants.CN_AT, schema.getSchemaName() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
 
         if ( schema.isDisabled() )
         {
             entry.put( MetaSchemaConstants.M_DISABLED_AT, "TRUE" );
         }
 
         String[] dependencies = schema.getDependencies();
 
         if ( dependencies != null && dependencies.length > 0 )
         {
             Attribute attr = new DefaultAttribute(
                 schemaManager.getAttributeType( MetaSchemaConstants.M_DEPENDENCIES_AT ) );
 
             for ( String dependency : dependencies )
             {
                 attr.add( dependency );
             }
 
             entry.put( attr );
         }
 
         return entry;
     }
 
 
     /**
      * Convert a SyntaxChecker instance into an Entry
      *
      * @param syntaxChecker The SyntaxChecker to convert
      * @param schema The schema containing this SyntaxChecker
      * @param schemaManager The SchemaManager
      * @return An Entry containing the converted SyntaxChecker
      */
     public Entry convert( SyntaxChecker syntaxChecker, Schema schema, SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_SYNTAX_CHECKER_OC );
         entry.put( MetaSchemaConstants.M_OID_AT, syntaxChecker.getOid() );
         entry.put( MetaSchemaConstants.M_FQCN_AT, syntaxChecker.getClass().getName() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
 
         return entry;
     }
 
 
     /**
      * Convert a Syntax instance into an Entry
      *
      * @param syntax The LdapSytax to convert
      * @param schema The schema containing this Syntax
      * @param schemaManager The SchemaManager
      * @return And entry defining a LdapSyntax
      * @throws LdapException If the conversion failed
      */
     public Entry convert( LdapSyntax syntax, Schema schema, SchemaManager schemaManager ) throws LdapException
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_SYNTAX_OC );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         injectCommon( syntax, entry, schemaManager );
 
         return entry;
     }
 
 
     /**
      * Convert a Normalizer instance into an Entry
      *
      * @param oid The Normalizer's OID
      * @param normalizer The Normalizer to convert
      * @param schema The schema containing this Normalizer
      * @param schemaManager The SchemaManager
      * @return An Entry defining a Normalizer
      */
     public Entry convert( String oid, Normalizer normalizer, Schema schema, SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_NORMALIZER_OC );
         entry.put( MetaSchemaConstants.M_OID_AT, oid );
         entry.put( MetaSchemaConstants.M_FQCN_AT, normalizer.getClass().getName() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         return entry;
     }
 
 
     /**
      * Convert a LdapComparator instance into an Entry
      *
      * @param oid The LdapComparator's OID
      * @param comparator The LdapComparator to convert
      * @param schema The schema containing this Comparator
      * @param schemaManager The SchemaManager
      * @return An Entry defining a LdapComparator
      */
     public Entry convert( String oid, LdapComparator<? super Object> comparator, Schema schema,
         SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_COMPARATOR_OC );
         entry.put( MetaSchemaConstants.M_OID_AT, oid );
         entry.put( MetaSchemaConstants.M_FQCN_AT, comparator.getClass().getName() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         return entry;
     }
 
 
     /**
      * Converts a MatchingRule into an Entry
      * 
      * @param matchingRule The MatchingRule to convert
      * @param schema The schema containing this ObjectClass
      * @param schemaManager The SchemaManager
      * @return The converted MatchingRule
      * @throws LdapException If the conversion failed
      */
     public Entry convert( MatchingRule matchingRule, Schema schema, SchemaManager schemaManager )
         throws LdapException
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_MATCHING_RULE_OC );
         entry.put( MetaSchemaConstants.M_SYNTAX_AT, matchingRule.getSyntaxOid() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         injectCommon( matchingRule, entry, schemaManager );
         return entry;
     }
 
 
     /**
      * Converts a MatchingRuleUse into an Entry
      *
      * @param matchingRuleUse The MatchingRuleUse to convert
      * @param schema The schema containing this MatchingRuleUse
      * @param schemaManager The SchemaManager
      * @return The converted MatchingRuleUse
      */
     public Entry convert( MatchingRuleUse matchingRuleUse, Schema schema, SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         return entry;
     }
 
 
     /**
      * Converts a DitStructureRule into an Entry
      *
      * @param ditStructureRule The DitStructureRule to convert
      * @param schema The schema containing this DitStructureRule
      * @param schemaManager The SchemaManager
      * @return The converted DitStructureRule
      */
     public Entry convert( DitStructureRule ditStructureRule, Schema schema, SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         return entry;
     }
 
 
     /**
      * Converts a DitContentRule into an Entry
      *
      * @param dITContentRule The DitContentRule to convert
      * @param schema The schema containing this DitContentRule
      * @param schemaManager The SchemaManager
      * @return The converted DitContentRule
      */
     public Entry convert( DitContentRule dITContentRule, Schema schema, SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         return entry;
     }
 
 
     /**
      * 
      * Converts a NameForm into an Entry
      *
      * @param nameForm The NameForm to convert
      * @param schema The schema containing this NameForm
      * @param schemaManager The SchemaManager
      * @return The converted NameForm
      */
     public Entry convert( NameForm nameForm, Schema schema, SchemaManager schemaManager )
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, "" );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
         return entry;
     }
 
 
     /**
      * <pre>
      *    objectclass ( 1.3.6.1.4.1.18060.0.4.0.3.3
      *       NAME 'metaAttributeType'
      *       DESC 'meta definition of the AttributeType object'
      *       SUP metaTop
      *       STRUCTURAL
      *       MUST ( m-name $ m-syntax )
      *       MAY ( m-supAttributeType $ m-obsolete $ m-equality $ m-ordering $
      *             m-substr $ m-singleValue $ m-collective $ m-noUserModification $
      *             m-usage $ m-extensionAttributeType )
      *    )
      * </pre>
      * 
      * @param attributeType The AttributeType to convert
      * @param schema The schema containing this AttributeType
      * @param schemaManager The SchemaManager
      * @return The converted AttributeType 
      * @throws LdapException If the conversion failed
      */
     public Entry convert( AttributeType attributeType, Schema schema, SchemaManager schemaManager )
         throws LdapException
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_ATTRIBUTE_TYPE_OC );
         entry.put( MetaSchemaConstants.M_COLLECTIVE_AT, getBoolean( attributeType.isCollective() ) );
         entry.put( MetaSchemaConstants.M_NO_USER_MODIFICATION_AT, getBoolean( !attributeType.isUserModifiable() ) );
         entry.put( MetaSchemaConstants.M_SINGLE_VALUE_AT, getBoolean( attributeType.isSingleValued() ) );
         entry.put( MetaSchemaConstants.M_USAGE_AT, attributeType.getUsage().toString() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
 
         injectCommon( attributeType, entry, schemaManager );
 
         String superiorOid = attributeType.getSuperiorOid();
 
         if ( superiorOid != null )
         {
             entry.put( MetaSchemaConstants.M_SUP_ATTRIBUTE_TYPE_AT, superiorOid );
         }
 
         if ( attributeType.getEqualityOid() != null )
         {
             entry.put( MetaSchemaConstants.M_EQUALITY_AT, attributeType.getEqualityOid() );
         }
 
         if ( attributeType.getSubstringOid() != null )
         {
             entry.put( MetaSchemaConstants.M_SUBSTR_AT, attributeType.getSubstringOid() );
         }
 
         if ( attributeType.getOrderingOid() != null )
         {
             entry.put( MetaSchemaConstants.M_ORDERING_AT, attributeType.getOrderingOid() );
         }
 
         if ( attributeType.getSyntaxOid() != null )
         {
             entry.put( MetaSchemaConstants.M_SYNTAX_AT, attributeType.getSyntaxOid() );
         }
 
         return entry;
     }
 
 
     /**
      * Creates the attributes of an entry representing an objectClass.
      * 
      * <pre>
      *  objectclass ( 1.3.6.1.4.1.18060.0.4.0.3.2
      *      NAME 'metaObjectClass'
      *      DESC 'meta definition of the objectclass object'
      *      SUP metaTop
      *      STRUCTURAL
      *      MUST m-oid
      *      MAY ( m-name $ m-obsolete $ m-supObjectClass $ m-typeObjectClass $ m-must $
      *            m-may $ m-extensionObjectClass )
      *  )
      * </pre>
      * 
      * @param objectClass the objectClass to produce a meta schema entry for
      * @param schema The schema containing this ObjectClass
      * @param schemaManager The SchemaManager
      * @return the attributes of the metaSchema entry representing the objectClass
      * @throws LdapException If the conversion failed
      */
     public Entry convert( ObjectClass objectClass, Schema schema, SchemaManager schemaManager )
         throws LdapException
     {
         Entry entry = new DefaultEntry( schemaManager );
 
         entry.put( SchemaConstants.OBJECT_CLASS_AT, SchemaConstants.TOP_OC, MetaSchemaConstants.META_OBJECT_CLASS_OC );
         entry.put( MetaSchemaConstants.M_TYPE_OBJECT_CLASS_AT, objectClass.getType().toString() );
         entry.put( SchemaConstants.CREATORS_NAME_AT, schema.getOwner() );
         entry.put( SchemaConstants.CREATE_TIMESTAMP_AT, DateUtils.getGeneralizedTime() );
 
         injectCommon( objectClass, entry, schemaManager );
         Attribute attr = null;
 
         // handle the superior objectClasses
         if ( objectClass.getSuperiorOids() != null && !objectClass.getSuperiorOids().isEmpty() )
         {
             if ( schemaManager != null )
             {
                 attr = new DefaultAttribute(
                     schemaManager.getAttributeType( MetaSchemaConstants.M_SUP_OBJECT_CLASS_AT ) );
             }
             else
             {
                 attr = new DefaultAttribute( MetaSchemaConstants.M_SUP_OBJECT_CLASS_AT );
             }
 
             for ( String superior : objectClass.getSuperiorOids() )
             {
                 attr.add( superior );
             }
 
             entry.put( attr );
         }
 
         // add the must list
         if ( objectClass.getMustAttributeTypeOids() != null && !objectClass.getMustAttributeTypeOids().isEmpty() )
         {
             if ( schemaManager != null )
             {
                 attr = new DefaultAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_MUST_AT ) );
             }
             else
             {
                 attr = new DefaultAttribute( MetaSchemaConstants.M_MUST_AT );
             }
 
             for ( String mustOid : objectClass.getMustAttributeTypeOids() )
             {
                 attr.add( mustOid );
             }
 
             entry.put( attr );
         }
 
         // add the may list
         if ( objectClass.getMayAttributeTypeOids() != null && !objectClass.getMayAttributeTypeOids().isEmpty() )
         {
             if ( schemaManager != null )
             {
                 attr = new DefaultAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_MAY_AT ) );
             }
             else
             {
                 attr = new DefaultAttribute( MetaSchemaConstants.M_MAY_AT );
             }
 
             for ( String mayOid : objectClass.getMayAttributeTypeOids() )
             {
                 attr.add( mayOid );
             }
 
             entry.put( attr );
         }
 
         return entry;
     }
 
 
     private void injectCommon( SchemaObject object, Entry entry, SchemaManager schemaManager )
         throws LdapException
     {
         injectNames( object.getNames(), entry, schemaManager );
         entry.put( MetaSchemaConstants.M_OBSOLETE_AT, getBoolean( object.isObsolete() ) );
         entry.put( MetaSchemaConstants.M_OID_AT, object.getOid() );
 
         if ( object.getDescription() != null )
         {
             entry.put( MetaSchemaConstants.M_DESCRIPTION_AT, object.getDescription() );
         }
 
         // The extensions
         Map<String, List<String>> extensions = object.getExtensions();
 
         if ( extensions != null )
         {
             for ( Map.Entry<String, List<String>> mapEntry : extensions.entrySet() )
             {
                 String key = mapEntry.getKey();
                 List<String> values = mapEntry.getValue();
 
                 for ( String value : values )
                 {
                     entry.add( key, value );
                 }
             }
         }
     }
 
 
     private void injectNames( List<String> names, Entry entry, SchemaManager schemaManager ) throws LdapException
     {
         if ( ( names == null ) || names.isEmpty() )
         {
             return;
         }
 
         Attribute attr = null;
 
         if ( schemaManager != null )
         {
             attr = new DefaultAttribute( schemaManager.getAttributeType( MetaSchemaConstants.M_NAME_AT ) );
         }
         else
         {
             attr = new DefaultAttribute( MetaSchemaConstants.M_NAME_AT );
         }
 
         for ( String name : names )
         {
             attr.add( name );
         }
 
         entry.put( attr );
     }
 
 
     private String getBoolean( boolean value )
     {
         if ( value )
         {
             return "TRUE";
         }
         else
         {
             return "FALSE";
         }
     }
 }