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 */ 020package org.apache.directory.api.ldap.model.schema.syntaxCheckers; 021 022 023import org.apache.directory.api.ldap.model.constants.SchemaConstants; 024import org.apache.directory.api.ldap.model.schema.SyntaxChecker; 025import org.apache.directory.api.util.Strings; 026import org.slf4j.Logger; 027import 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 */ 041@SuppressWarnings("serial") 042public class NumberSyntaxChecker extends SyntaxChecker 043{ 044 /** A logger for this class */ 045 private static final Logger LOG = LoggerFactory.getLogger( NumberSyntaxChecker.class ); 046 047 048 /** 049 * Creates a new instance of NumberSyntaxChecker. 050 */ 051 public NumberSyntaxChecker() 052 { 053 super( SchemaConstants.NUMBER_SYNTAX ); 054 } 055 056 057 /** 058 * {@inheritDoc} 059 */ 060 public boolean isValidSyntax( Object value ) 061 { 062 String strValue = null; 063 064 if ( value == null ) 065 { 066 LOG.debug( "Syntax invalid for 'null'" ); 067 return false; 068 } 069 070 if ( value instanceof String ) 071 { 072 strValue = ( String ) value; 073 } 074 else if ( value instanceof byte[] ) 075 { 076 strValue = Strings.utf8ToString( ( byte[] ) value ); 077 } 078 else 079 { 080 strValue = value.toString(); 081 } 082 083 // We should have at least one char 084 if ( strValue.length() == 0 ) 085 { 086 LOG.debug( "Syntax invalid for '{}'", value ); 087 return false; 088 } 089 090 // Check that each char is either a digit or a space 091 for ( int i = 0; i < strValue.length(); i++ ) 092 { 093 switch ( strValue.charAt( i ) ) 094 { 095 case '0': 096 case '1': 097 case '2': 098 case '3': 099 case '4': 100 case '5': 101 case '6': 102 case '7': 103 case '8': 104 case '9': 105 continue; 106 107 default: 108 LOG.debug( "Syntax invalid for '{}'", value ); 109 return false; 110 } 111 } 112 113 if ( ( strValue.charAt( 0 ) == '0' ) && strValue.length() > 1 ) 114 { 115 // A number can't start with a '0' unless it's the only 116 // number 117 LOG.debug( "Syntax invalid for '{}'", value ); 118 return false; 119 } 120 121 LOG.debug( "Syntax valid for '{}'", value ); 122 return true; 123 } 124}