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.shared.ldap.model.schema.syntaxCheckers; 021 022import org.apache.directory.shared.ldap.model.constants.SchemaConstants; 023import org.apache.directory.shared.ldap.model.schema.SyntaxChecker; 024import org.apache.directory.shared.util.Chars; 025import org.apache.directory.shared.util.Strings; 026import org.slf4j.Logger; 027import org.slf4j.LoggerFactory; 028 029 030/** 031 * A SyntaxChecker which verifies that a value is a valid Java primitive int or 032 * the Integer wrapper. Essentially this constrains the min and max values of 033 * the Integer. 034 * 035 * From RFC 4517 : 036 * 037 * Integer = ( HYPHEN LDIGIT *DIGIT ) | number 038 * 039 * From RFC 4512 : 040 * number = DIGIT | ( LDIGIT 1*DIGIT ) 041 * DIGIT = %x30 | LDIGIT ; "0"-"9" 042 * LDIGIT = %x31-39 ; "1"-"9" 043 * HYPHEN = %x2D ; hyphen ("-") 044 * 045 * 046 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 047 */ 048@SuppressWarnings("serial") 049public class JavaIntegerSyntaxChecker extends SyntaxChecker 050{ 051 /** A logger for this class */ 052 private static final Logger LOG = LoggerFactory.getLogger( JavaIntegerSyntaxChecker.class ); 053 054 /** 055 * Creates a new instance of JavaIntegerSyntaxChecker. 056 */ 057 public JavaIntegerSyntaxChecker() 058 { 059 super( SchemaConstants.JAVA_INT_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 boolean result = strValue.length() <= 1; 112 113 if ( result ) 114 { 115 LOG.debug( "Syntax valid for '{}'", value ); 116 } 117 else 118 { 119 LOG.debug( "Syntax invalid for '{}'", value ); 120 } 121 122 return result; 123 } 124 125 // We must have at least a digit which is not '0' 126 if ( !Chars.isDigit(strValue, pos) ) 127 { 128 LOG.debug( "Syntax invalid for '{}'", value ); 129 return false; 130 } 131 else if ( Strings.isCharASCII( strValue, pos, '0' ) ) 132 { 133 LOG.debug( "Syntax invalid for '{}'", value ); 134 return false; 135 } 136 else 137 { 138 pos++; 139 } 140 141 while ( Chars.isDigit(strValue, pos) ) 142 { 143 pos++; 144 } 145 146 if ( pos != strValue.length() ) 147 { 148 LOG.debug( "Syntax invalid for '{}'", value ); 149 return false; 150 } 151 152 try 153 { 154 Integer.valueOf( strValue ); 155 LOG.debug( "Syntax valid for '{}'", value ); 156 return true; 157 } 158 catch ( NumberFormatException e ) 159 { 160 LOG.debug( "Syntax invalid for '{}'", value ); 161 return false; 162 } 163 } 164}