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 * A SyntaxChecker which verifies that a value is a valid Java primitive Short or
030 * the Short wrapper. Essentially this constrains the min and max values of
031 * the Short.
032 *
033 * From RFC 4517 :
034 *
035 * Integer = ( HYPHEN LDIGIT *DIGIT ) | number
036 *
037 * From RFC 4512 :
038 * number = DIGIT | ( LDIGIT 1*DIGIT )
039 * DIGIT = %x30 | LDIGIT ; "0"-"9"
040 * LDIGIT = %x31-39 ; "1"-"9"
041 * HYPHEN = %x2D ; hyphen ("-")
042 *
043 *
044 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
045 * @version $Rev$
046 */
047 public class JavaShortSyntaxChecker extends SyntaxChecker
048 {
049 /** A logger for this class */
050 private static final Logger LOG = LoggerFactory.getLogger( JavaShortSyntaxChecker.class );
051
052 /** The serialVersionUID */
053 private static final long serialVersionUID = 1L;
054
055 /**
056 * Creates a new instance of JavaShortSyntaxChecker.
057 */
058 public JavaShortSyntaxChecker()
059 {
060 super( SchemaConstants.JAVA_SHORT_SYNTAX );
061 }
062
063
064 /**
065 * {@inheritDoc}
066 */
067 public boolean isValidSyntax( Object value )
068 {
069 String strValue = null;
070
071 if ( value == null )
072 {
073 LOG.debug( "Syntax invalid for '{}'", value );
074 return false;
075 }
076
077 if ( value instanceof String )
078 {
079 strValue = ( String ) value;
080 }
081 else if ( value instanceof byte[] )
082 {
083 strValue = StringTools.utf8ToString( ( byte[] ) value );
084 }
085 else
086 {
087 strValue = value.toString();
088 }
089
090 if ( strValue.length() == 0 )
091 {
092 LOG.debug( "Syntax invalid for '{}'", value );
093 return false;
094 }
095
096 // The first char must be either a '-' or in [0..9].
097 // If it's a '0', then there should be any other char after
098 int pos = 0;
099 char c = strValue.charAt( pos );
100
101 if ( c == '-' )
102 {
103 pos = 1;
104 }
105 else if ( !StringTools.isDigit( c ) )
106 {
107 LOG.debug( "Syntax invalid for '{}'", value );
108 return false;
109 }
110 else if ( c == '0' )
111 {
112 if ( strValue.length() > 1 )
113 {
114 LOG.debug( "Syntax invalid for '{}'", value );
115 return false;
116 }
117 else
118 {
119 LOG.debug( "Syntax valid for '{}'", value );
120 return true;
121 }
122 }
123
124 // We must have at least a digit which is not '0'
125 if ( !StringTools.isDigit( strValue, pos ) )
126 {
127 LOG.debug( "Syntax invalid for '{}'", value );
128 return false;
129 }
130 else if ( StringTools.isCharASCII( strValue, pos, '0' ) )
131 {
132 LOG.debug( "Syntax invalid for '{}'", value );
133 return false;
134 }
135 else
136 {
137 pos++;
138 }
139
140 while ( StringTools.isDigit( strValue, pos) )
141 {
142 pos++;
143 }
144
145 if ( pos != strValue.length() )
146 {
147 LOG.debug( "Syntax invalid for '{}'", value );
148 return false;
149 }
150
151 // Should get a NumberFormatException for Byte values out of range
152 try
153 {
154 Short.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 }