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    import java.text.ParseException;
023    
024    import org.apache.directory.shared.ldap.constants.SchemaConstants;
025    import org.apache.directory.shared.ldap.schema.SyntaxChecker;
026    import org.apache.directory.shared.ldap.subtree.SubtreeSpecificationChecker;
027    import org.apache.directory.shared.ldap.util.StringTools;
028    import org.slf4j.Logger;
029    import org.slf4j.LoggerFactory;
030    
031    
032    /**
033     * A SyntaxChecker which verifies that a value is a subtree specification.
034     * 
035     * It has been removed in RFC 4517
036     *  
037     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038     * @version $Rev: 488616 $
039     */
040    public class SubtreeSpecificationSyntaxChecker extends SyntaxChecker
041    {
042        /** A logger for this class */
043        private static final Logger LOG = LoggerFactory.getLogger( SubtreeSpecificationSyntaxChecker.class );
044    
045        /** The serialVersionUID */
046        private static final long serialVersionUID = 1L;
047    
048        /** The associated checker */ 
049        private SubtreeSpecificationChecker checker = new SubtreeSpecificationChecker();
050    
051        /**
052         * Creates an instance of SubtreeSpecificationSyntaxChecker
053         */
054        public SubtreeSpecificationSyntaxChecker()
055        {
056            super( SchemaConstants.SUBTREE_SPECIFICATION_SYNTAX );
057        }
058    
059    
060        /**
061         * {@inheritDoc}
062         */
063        public boolean isValidSyntax( Object value )
064        {
065            String strValue = null;
066    
067            if ( value == null )
068            {
069                LOG.debug( "Syntax invalid for '{}'", value );
070                return false;
071            }
072            
073            if ( value instanceof String )
074            {
075                strValue = ( String ) value;
076            }
077            else if ( value instanceof byte[] )
078            {
079                strValue = StringTools.utf8ToString( ( byte[] ) value ); 
080            }
081            else
082            {
083                strValue = value.toString();
084            }
085    
086            if ( strValue.length() == 0 )
087            {
088                LOG.debug( "Syntax invalid for '{}'", value );
089                return false;
090            }
091    
092            try
093            {
094                synchronized( checker )
095                {
096                    checker.parse( strValue );
097                }
098                
099                LOG.debug( "Syntax valid for '{}'", value );
100                return true;
101            }
102            catch ( ParseException pe )
103            {
104                LOG.debug( "Syntax invalid for '{}'", value );
105                return false;
106            }
107        }
108    }