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 import org.apache.directory.shared.ldap.constants.SchemaConstants;
023 import org.apache.directory.shared.ldap.schema.SyntaxChecker;
024 import org.apache.directory.shared.ldap.util.StringTools;
025 import org.slf4j.Logger;
026 import org.slf4j.LoggerFactory;
027
028
029 /**
030 * A SyntaxChecker which verifies that a value is a valid Java primitive int or
031 * the Integer wrapper. Essentially this constrains the min and max values of
032 * the Integer.
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 * @version $Rev$
047 */
048 public class JavaIntegerSyntaxChecker extends SyntaxChecker
049 {
050 /** A logger for this class */
051 private static final Logger LOG = LoggerFactory.getLogger( JavaIntegerSyntaxChecker.class );
052
053 /** The serialVersionUID */
054 private static final long serialVersionUID = 1L;
055
056 /**
057 * Creates a new instance of JavaIntegerSyntaxChecker.
058 */
059 public JavaIntegerSyntaxChecker()
060 {
061 super( SchemaConstants.JAVA_INT_SYNTAX );
062 }
063
064
065 /**
066 * {@inheritDoc}
067 */
068 public boolean isValidSyntax( Object value )
069 {
070 String strValue =null;
071
072 if ( value == null )
073 {
074 LOG.debug( "Syntax invalid for '{}'", value );
075 return false;
076 }
077
078 if ( value instanceof String )
079 {
080 strValue = ( String ) value;
081 }
082 else if ( value instanceof byte[] )
083 {
084 strValue = StringTools.utf8ToString( ( byte[] ) value );
085 }
086 else
087 {
088 strValue = value.toString();
089 }
090
091 if ( strValue.length() == 0 )
092 {
093 LOG.debug( "Syntax invalid for '{}'", value );
094 return false;
095 }
096
097 // The first char must be either a '-' or in [0..9].
098 // If it's a '0', then there should be any other char after
099 int pos = 0;
100 char c = strValue.charAt( pos );
101
102 if ( c == '-' )
103 {
104 pos = 1;
105 }
106 else if ( !StringTools.isDigit( c ) )
107 {
108 LOG.debug( "Syntax invalid for '{}'", value );
109 return false;
110 }
111 else if ( c == '0' )
112 {
113 boolean result = strValue.length() <= 1;
114
115 if ( result )
116 {
117 LOG.debug( "Syntax valid for '{}'", value );
118 }
119 else
120 {
121 LOG.debug( "Syntax invalid for '{}'", value );
122 }
123
124 return result;
125 }
126
127 // We must have at least a digit which is not '0'
128 if ( !StringTools.isDigit( strValue, pos ) )
129 {
130 LOG.debug( "Syntax invalid for '{}'", value );
131 return false;
132 }
133 else if ( StringTools.isCharASCII( strValue, pos, '0' ) )
134 {
135 LOG.debug( "Syntax invalid for '{}'", value );
136 return false;
137 }
138 else
139 {
140 pos++;
141 }
142
143 while ( StringTools.isDigit( strValue, pos) )
144 {
145 pos++;
146 }
147
148 if ( pos != strValue.length() )
149 {
150 LOG.debug( "Syntax invalid for '{}'", value );
151 return false;
152 }
153
154 try
155 {
156 Integer.valueOf( strValue );
157 LOG.debug( "Syntax valid for '{}'", value );
158 return true;
159 }
160 catch ( NumberFormatException e )
161 {
162 LOG.debug( "Syntax invalid for '{}'", value );
163 return false;
164 }
165 }
166 }