001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *  
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *  
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License. 
018 *  
019 */
020package org.apache.directory.api.ldap.model.schema.syntaxCheckers;
021
022
023import org.apache.directory.api.ldap.model.constants.SchemaConstants;
024import org.apache.directory.api.ldap.model.name.Dn;
025import org.apache.directory.api.ldap.model.schema.SyntaxChecker;
026import org.apache.directory.api.util.Strings;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030
031/**
032 * A SyntaxChecker which verifies that a value is a valid Dn. We just check
033 * that the Dn is valid, we don't need to verify each of the Rdn syntax.
034 * 
035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
036 */
037@SuppressWarnings("serial")
038public class DnSyntaxChecker extends SyntaxChecker
039{
040    /** A logger for this class */
041    private static final Logger LOG = LoggerFactory.getLogger( DnSyntaxChecker.class );
042
043
044    /**
045     * Creates a new instance of DNSyntaxChecker.
046     */
047    public DnSyntaxChecker()
048    {
049        super( SchemaConstants.DN_SYNTAX );
050    }
051
052
053    /**
054     * {@inheritDoc}
055     */
056    public boolean isValidSyntax( Object value )
057    {
058        String strValue = null;
059
060        if ( value == null )
061        {
062            LOG.debug( "Syntax invalid for 'null'" );
063            return false;
064        }
065
066        if ( value instanceof String )
067        {
068            strValue = ( String ) value;
069        }
070        else if ( value instanceof byte[] )
071        {
072            strValue = Strings.utf8ToString( ( byte[] ) value );
073        }
074        else
075        {
076            strValue = value.toString();
077        }
078
079        if ( strValue.length() == 0 )
080        {
081            // TODO: this should be a false, but for 
082            // some reason, the principal is empty in 
083            // some cases.
084            LOG.debug( "Syntax valid for '{}'", value );
085            return true;
086        }
087
088        // Check that the value is a valid Dn
089        boolean result = Dn.isValid( strValue );
090
091        if ( result )
092        {
093            LOG.debug( "Syntax valid for '{}'", value );
094        }
095        else
096        {
097            LOG.debug( "Syntax invalid for '{}'", value );
098        }
099
100        return result;
101    }
102}