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 a valid Java primitive short or
033 * the Short wrapper.  Essentially this constrains the min and max values of
034 * the Integer.
035 *
036 * From RFC 4517 :
037 *
038 * Integer = ( HYPHEN LDIGIT *DIGIT ) | number
039 *
040 * From RFC 4512 :
041 * number  = DIGIT | ( LDIGIT 1*DIGIT )
042 * DIGIT   = %x30 | LDIGIT       ; "0"-"9"
043 * LDIGIT  = %x31-39             ; "1"-"9"
044 * HYPHEN  = %x2D                ; hyphen ("-")
045 *
046 *
047 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
048 */
049@SuppressWarnings("serial")
050public class JavaByteSyntaxChecker extends SyntaxChecker
051{
052    /** A logger for this class */
053    private static final Logger LOG = LoggerFactory.getLogger( JavaByteSyntaxChecker.class );
054
055
056    /**
057     * Creates a new instance of JavaByteSyntaxChecker.
058     */
059    public JavaByteSyntaxChecker()
060    {
061        super( SchemaConstants.JAVA_BYTE_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 'null'" );
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 = Strings.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 ( !Chars.isDigit( c ) )
107        {
108            LOG.debug( "Syntax invalid for '{}'", value );
109            return false;
110        }
111        else if ( c == '0' )
112        {
113            if ( strValue.length() > 1 )
114            {
115                LOG.debug( "Syntax invalid for '{}'", value );
116                return false;
117            }
118            else
119            {
120                LOG.debug( "Syntax valid for '{}'", value );
121                return true;
122            }
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        // Should get a NumberFormatException for Byte values out of range
153        try
154        {
155            Byte.valueOf( strValue );
156            LOG.debug( "Syntax valid for '{}'", value );
157            return true;
158        }
159        catch ( NumberFormatException e )
160        {
161            LOG.debug( "Syntax invalid for '{}'", value );
162            return false;
163        }
164    }
165}