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 * A SyntaxChecker which verifies that a value is a valid Java primitive Short or 031 * the Short wrapper. Essentially this constrains the min and max values of 032 * the Short. 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 JavaShortSyntaxChecker extends SyntaxChecker 049{ 050 /** A logger for this class */ 051 private static final Logger LOG = LoggerFactory.getLogger( JavaShortSyntaxChecker.class ); 052 053 /** 054 * Creates a new instance of JavaShortSyntaxChecker. 055 */ 056 public JavaShortSyntaxChecker() 057 { 058 super( SchemaConstants.JAVA_SHORT_SYNTAX ); 059 } 060 061 062 /** 063 * {@inheritDoc} 064 */ 065 public boolean isValidSyntax( Object value ) 066 { 067 String strValue = null; 068 069 if ( value == null ) 070 { 071 LOG.debug( "Syntax invalid for 'null'" ); 072 return false; 073 } 074 075 if ( value instanceof String ) 076 { 077 strValue = ( String ) value; 078 } 079 else if ( value instanceof byte[] ) 080 { 081 strValue = Strings.utf8ToString((byte[]) value); 082 } 083 else 084 { 085 strValue = value.toString(); 086 } 087 088 if ( strValue.length() == 0 ) 089 { 090 LOG.debug( "Syntax invalid for '{}'", value ); 091 return false; 092 } 093 094 // The first char must be either a '-' or in [0..9]. 095 // If it's a '0', then there should be any other char after 096 int pos = 0; 097 char c = strValue.charAt( pos ); 098 099 if ( c == '-' ) 100 { 101 pos = 1; 102 } 103 else if ( !Chars.isDigit(c) ) 104 { 105 LOG.debug( "Syntax invalid for '{}'", value ); 106 return false; 107 } 108 else if ( c == '0' ) 109 { 110 if ( strValue.length() > 1 ) 111 { 112 LOG.debug( "Syntax invalid for '{}'", value ); 113 return false; 114 } 115 else 116 { 117 LOG.debug( "Syntax valid for '{}'", value ); 118 return true; 119 } 120 } 121 122 // We must have at least a digit which is not '0' 123 if ( !Chars.isDigit(strValue, pos) ) 124 { 125 LOG.debug( "Syntax invalid for '{}'", value ); 126 return false; 127 } 128 else if ( Strings.isCharASCII( strValue, pos, '0' ) ) 129 { 130 LOG.debug( "Syntax invalid for '{}'", value ); 131 return false; 132 } 133 else 134 { 135 pos++; 136 } 137 138 while ( Chars.isDigit(strValue, pos) ) 139 { 140 pos++; 141 } 142 143 if ( pos != strValue.length() ) 144 { 145 LOG.debug( "Syntax invalid for '{}'", value ); 146 return false; 147 } 148 149 // Should get a NumberFormatException for Byte values out of range 150 try 151 { 152 Short.valueOf( strValue ); 153 LOG.debug( "Syntax valid for '{}'", value ); 154 return true; 155 } 156 catch ( NumberFormatException e ) 157 { 158 LOG.debug( "Syntax invalid for '{}'", value ); 159 return false; 160 } 161 } 162}