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.Chars; 026import org.apache.directory.api.util.Strings; 027import org.slf4j.Logger; 028import org.slf4j.LoggerFactory; 029 030 031/** 032 * A SyntaxChecker which verifies that a value is an Integer according to RFC 4517. 033 * 034 * From RFC 4517 : 035 * 036 * Integer = ( HYPHEN LDIGIT *DIGIT ) | number 037 * 038 * From RFC 4512 : 039 * number = DIGIT | ( LDIGIT 1*DIGIT ) 040 * DIGIT = %x30 | LDIGIT ; "0"-"9" 041 * LDIGIT = %x31-39 ; "1"-"9" 042 * HYPHEN = %x2D ; hyphen ("-") 043 * 044 * 045 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 046 */ 047@SuppressWarnings("serial") 048public class IntegerSyntaxChecker extends SyntaxChecker 049{ 050 /** A logger for this class */ 051 private static final Logger LOG = LoggerFactory.getLogger( IntegerSyntaxChecker.class ); 052 053 054 /** 055 * Creates a new instance of IntegerSyntaxChecker. 056 */ 057 public IntegerSyntaxChecker() 058 { 059 super( SchemaConstants.INTEGER_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 'null'" ); 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 = Strings.utf8ToString( ( byte[] ) value ); 083 } 084 else 085 { 086 strValue = value.toString(); 087 } 088 089 if ( strValue.length() == 0 ) 090 { 091 LOG.debug( "Syntax invalid for '{}'", value ); 092 return false; 093 } 094 095 // The first char must be either a '-' or in [0..9]. 096 // If it's a '0', then there should be any other char after 097 int pos = 0; 098 char c = strValue.charAt( pos ); 099 100 if ( c == '-' ) 101 { 102 pos = 1; 103 } 104 else if ( !Chars.isDigit( c ) ) 105 { 106 LOG.debug( "Syntax invalid for '{}'", value ); 107 return false; 108 } 109 else if ( c == '0' ) 110 { 111 if ( strValue.length() > 1 ) 112 { 113 LOG.debug( "Syntax invalid for '{}'", value ); 114 return false; 115 } 116 else 117 { 118 LOG.debug( "Syntax valid for '{}'", value ); 119 return true; 120 } 121 } 122 123 // We must have at least a digit which is not '0' 124 if ( !Chars.isDigit( strValue, pos ) ) 125 { 126 LOG.debug( "Syntax invalid for '{}'", value ); 127 return false; 128 } 129 else if ( Strings.isCharASCII( strValue, pos, '0' ) ) 130 { 131 LOG.debug( "Syntax invalid for '{}'", value ); 132 return false; 133 } 134 else 135 { 136 pos++; 137 } 138 139 while ( Chars.isDigit( strValue, pos ) ) 140 { 141 pos++; 142 } 143 144 boolean result = ( pos == strValue.length() ); 145 146 if ( result ) 147 { 148 LOG.debug( "Syntax valid for '{}'", value ); 149 } 150 else 151 { 152 LOG.debug( "Syntax invalid for '{}'", value ); 153 } 154 155 return result; 156 } 157}