/*
    *  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 java.util.ArrayList;
  import java.util.List;
  
  import org.apache.directory.api.ldap.model.schema.SyntaxChecker;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A SyntaxChecker implemented using Perl5 regular expressions to constrain
   * values.
   * 
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  @SuppressWarnings("serial")
  public class RegexSyntaxChecker extends SyntaxChecker
  {
      /** A logger for this class */
      private static final Logger LOG = LoggerFactory.getLogger( RegexSyntaxChecker.class );
  
      /** the set of regular expressions */
      private List<String> expressions;
  
  
      /**
       * Creates a Syntax validator for a specific Syntax using Perl5 matching
       * rules for validation.
       * 
       * @param oid
       *            the oid of the Syntax values checked
       * @param matchExprArray
       *            the array of matching expressions
       */
      public RegexSyntaxChecker( String oid, String[] matchExprArray )
      {
          super( oid );
  
          if ( ( matchExprArray != null ) && ( matchExprArray.length != 0 ) )
          {
              expressions = new ArrayList<String>( matchExprArray.length );
  
              for ( String regexp : matchExprArray )
              {
                  expressions.add( regexp );
              }
          }
          else
          {
              expressions = new ArrayList<String>();
          }
      }
  
  
      /**
       * 
       * Creates a new instance of RegexSyntaxChecker.
       * 
       * @param oid the oid to associate with this new SyntaxChecker
       *
       */
      public RegexSyntaxChecker( String oid )
      {
          super( oid );
          expressions = new ArrayList<String>();
      }
  
  
      /**
       * {@inheritDoc}
       */
      public boolean isValidSyntax( Object value )
      {
          String str = null;
          boolean match = true;
  
          if ( value instanceof String )
          {
             str = ( String ) value;
 
             for ( String regexp : expressions )
             {
                 match = match && str.matches( regexp );
 
                 if ( !match )
                 {
                     break;
                 }
             }
         }
 
         if ( match )
         {
             LOG.debug( "Syntax valid for '{}'", value );
         }
         else
         {
             LOG.debug( "Syntax invalid for '{}'", value );
         }
 
         return match;
     }
 
 
     /**
      * Get the list of regexp stored into this SyntaxChecker
      * 
      * @return AN array containing all the stored regexp
      */
     public String[] getExpressions()
     {
         String[] exprs = new String[expressions.size()];
         return expressions.toArray( exprs );
     }
 
 
     /**
      * Add a list of regexp to be applied by this SyntaxChecker
      * 
      * @param expressions The regexp list to add
      */
     public void setExpressions( String[] expressions )
     {
         for ( String regexp : expressions )
         {
             this.expressions.add( regexp );
         }
     }
 }