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     */
020    package org.apache.directory.shared.ldap.schema.syntaxCheckers;
021    
022    
023    import java.text.ParseException;
024    
025    import org.apache.directory.shared.ldap.constants.SchemaConstants;
026    import org.apache.directory.shared.ldap.schema.SyntaxChecker;
027    import org.apache.directory.shared.ldap.schema.parsers.DITContentRuleDescriptionSchemaParser;
028    import org.apache.directory.shared.ldap.util.StringTools;
029    import org.slf4j.Logger;
030    import org.slf4j.LoggerFactory;
031    
032    
033    /**
034     * A SyntaxChecker which verifies that a value follows the
035     * DIT content rule descripton syntax according to RFC 4512, par 4.2.6:
036     * 
037     * <pre>
038     * DITContentRuleDescription = LPAREN WSP
039     *    numericoid                 ; object identifier
040     *    [ SP "NAME" SP qdescrs ]   ; short names (descriptors)
041     *    [ SP "DESC" SP qdstring ]  ; description
042     *    [ SP "OBSOLETE" ]          ; not active
043     *    [ SP "AUX" SP oids ]       ; auxiliary object classes
044     *    [ SP "MUST" SP oids ]      ; attribute types
045     *    [ SP "MAY" SP oids ]       ; attribute types
046     *    [ SP "NOT" SP oids ]       ; attribute types
047     *    extensions WSP RPAREN      ; extensions
048     * </pre>
049     * 
050     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
051     * @version $Rev$
052     */
053    public class DITContentRuleDescriptionSyntaxChecker extends SyntaxChecker
054    {
055        /** A logger for this class */
056        private static final Logger LOG = LoggerFactory.getLogger( DITContentRuleDescriptionSyntaxChecker.class );
057    
058        /** The serialVersionUID */
059        private static final long serialVersionUID = 1L;
060    
061        /** The schema parser used to parse the DITContentRuleDescription Syntax */
062        private DITContentRuleDescriptionSchemaParser schemaParser = new DITContentRuleDescriptionSchemaParser();
063    
064    
065        /**
066         * Creates a new instance of DITContentRuleDescriptionSyntaxChecker.
067         */
068        public DITContentRuleDescriptionSyntaxChecker()
069        {
070            super( SchemaConstants.DIT_CONTENT_RULE_SYNTAX );
071        }
072        
073    
074        /**
075         * {@inheritDoc}
076         */
077        public boolean isValidSyntax( Object value )
078        {
079            String strValue = null;
080    
081            if ( value == null )
082            {
083                LOG.debug( "Syntax invalid for '{}'", value );
084                return false;
085            }
086    
087            if ( value instanceof String )
088            {
089                strValue = ( String ) value;
090            }
091            else if ( value instanceof byte[] )
092            {
093                strValue = StringTools.utf8ToString( ( byte[] ) value );
094            }
095            else
096            {
097                strValue = value.toString();
098            }
099    
100            try
101            {
102                schemaParser.parseDITContentRuleDescription( strValue );
103                LOG.debug( "Syntax valid for '{}'", value );
104                return true;
105            }
106            catch ( ParseException pe )
107            {
108                LOG.debug( "Syntax invalid for '{}'", value );
109                return false;
110            }
111        }
112    }