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 org.apache.directory.shared.ldap.constants.SchemaConstants;
024 import org.apache.directory.shared.ldap.schema.SyntaxChecker;
025 import org.apache.directory.shared.ldap.util.StringTools;
026 import org.slf4j.Logger;
027 import org.slf4j.LoggerFactory;
028
029
030 /**
031 * A SyntaxChecker which verifies that a value is a Numeric String according to RFC 4517.
032 *
033 * From RFC 4517 :
034 *
035 * NumericString = 1*(DIGIT / SPACE)
036 *
037 * From RFC 4512 :
038 * DIGIT = %x30 | LDIGIT ; "0"-"9"
039 * LDIGIT = %x31-39 ; "1"-"9"
040 * SPACE = %x20 ; space (" ")
041 *
042 *
043 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
044 * @version $Rev$
045 */
046 public class NumericStringSyntaxChecker extends SyntaxChecker
047 {
048 /** A logger for this class */
049 private static final Logger LOG = LoggerFactory.getLogger( NumericStringSyntaxChecker.class );
050
051 /** The serialVersionUID */
052 private static final long serialVersionUID = 1L;
053
054 /**
055 * Creates a new instance of NumericStringSyntaxChecker.
056 */
057 public NumericStringSyntaxChecker()
058 {
059 super( SchemaConstants.NUMERIC_STRING_SYNTAX );
060 }
061
062
063 /**
064 * {@inheritDoc}
065 */
066 public boolean isValidSyntax( Object value )
067 {
068 String strValue = null;
069
070 if ( value == null )
071 {
072 LOG.debug( "Syntax invalid for '{}'", value );
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 // We should have at least one char
090 if ( strValue.length() == 0 )
091 {
092 LOG.debug( "Syntax invalid for '{}'", value );
093 return false;
094 }
095
096 // Check that each char is either a digit or a space
097 for ( int i = 0; i < strValue.length(); i++ )
098 {
099 switch ( strValue.charAt( i ) )
100 {
101 case '0':
102 case '1' :
103 case '2' :
104 case '3' :
105 case '4' :
106 case '5' :
107 case '6' :
108 case '7' :
109 case '8' :
110 case '9' :
111 case ' ' :
112 continue;
113
114 default :
115 LOG.debug( "Syntax invalid for '{}'", value );
116 return false;
117 }
118 }
119
120 LOG.debug( "Syntax valid for '{}'", value );
121 return true;
122 }
123 }