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.syntaxes;
021    
022    
023    import org.apache.directory.shared.ldap.constants.SchemaConstants;
024    import org.apache.directory.shared.ldap.schema.AbstractSyntaxChecker;
025    import org.apache.directory.shared.ldap.util.StringTools;
026    
027    
028    /**
029     * A SyntaxChecker which verifies that a value is a Boolean according to RFC 4517.
030     * 
031     * From RFC 4517 :
032     * 
033     * Boolean = "TRUE" / "FALSE"
034     * 
035     *
036     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
037     * @version $Rev$
038     */
039    public class BooleanSyntaxChecker extends AbstractSyntaxChecker
040    {
041        /**
042         * 
043         * Creates a new instance of BooleanSyntaxChecker.
044         *
045         */
046        public BooleanSyntaxChecker()
047        {
048            super( SchemaConstants.BOOLEAN_SYNTAX );
049        }
050        
051        /**
052         * 
053         * Creates a new instance of BooleanSyntaxChecker.
054         * 
055         * @param oid the oid to associate with this new SyntaxChecker
056         *
057         */
058        protected BooleanSyntaxChecker( String oid )
059        {
060            super( oid );
061        }
062        
063        
064        /* (non-Javadoc)
065         * @see org.apache.directory.shared.ldap.schema.SyntaxChecker#isValidSyntax(java.lang.Object)
066         */
067        public boolean isValidSyntax( Object value )
068        {
069            String strValue = null;
070    
071            if ( value == null )
072            {
073                return false;
074            }
075            
076            if ( value instanceof String )
077            {
078                strValue = ( String ) value;
079            }
080            else if ( value instanceof byte[] )
081            {
082                strValue = StringTools.utf8ToString( ( byte[] ) value ); 
083            }
084            else
085            {
086                strValue = value.toString();
087            }
088    
089            if ( strValue.length() == 0 )
090            {
091                return false;
092            }
093            
094            return ( ( "TRUE".equalsIgnoreCase( strValue ) ) || ( "FALSE".equalsIgnoreCase( strValue ) ) );
095        }
096    }