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 Number according to RFC 4512. 032 * 033 * From RFC 4512 : 034 * number = DIGIT | ( LDIGIT 1*DIGIT ) 035 * DIGIT = %x30 | LDIGIT ; "0"-"9" 036 * LDIGIT = %x31-39 ; "1"-"9" 037 * 038 * 039 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 040 * @version $Rev$ 041 */ 042 public class NumberSyntaxChecker extends SyntaxChecker 043 { 044 /** A logger for this class */ 045 private static final Logger LOG = LoggerFactory.getLogger( NumberSyntaxChecker.class ); 046 047 /** The serialVersionUID */ 048 private static final long serialVersionUID = 1L; 049 050 /** 051 * Creates a new instance of NumberSyntaxChecker. 052 */ 053 public NumberSyntaxChecker() 054 { 055 super( SchemaConstants.NUMBER_SYNTAX ); 056 } 057 058 059 /** 060 * {@inheritDoc} 061 */ 062 public boolean isValidSyntax( Object value ) 063 { 064 String strValue = null; 065 066 if ( value == null ) 067 { 068 LOG.debug( "Syntax invalid for '{}'", value ); 069 return false; 070 } 071 072 if ( value instanceof String ) 073 { 074 strValue = ( String ) value; 075 } 076 else if ( value instanceof byte[] ) 077 { 078 strValue = StringTools.utf8ToString( ( byte[] ) value ); 079 } 080 else 081 { 082 strValue = value.toString(); 083 } 084 085 // We should have at least one char 086 if ( strValue.length() == 0 ) 087 { 088 LOG.debug( "Syntax invalid for '{}'", value ); 089 return false; 090 } 091 092 // Check that each char is either a digit or a space 093 for ( int i = 0; i < strValue.length(); i++ ) 094 { 095 switch ( strValue.charAt( i ) ) 096 { 097 case '0': 098 case '1' : 099 case '2' : 100 case '3' : 101 case '4' : 102 case '5' : 103 case '6' : 104 case '7' : 105 case '8' : 106 case '9' : 107 continue; 108 109 default : 110 LOG.debug( "Syntax invalid for '{}'", value ); 111 return false; 112 } 113 } 114 115 if ( ( strValue.charAt( 0 ) == '0' ) && strValue.length() > 1 ) 116 { 117 // A number can't start with a '0' unless it's the only 118 // number 119 LOG.debug( "Syntax invalid for '{}'", value ); 120 return false; 121 } 122 123 LOG.debug( "Syntax valid for '{}'", value ); 124 return true; 125 } 126 }