001 //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/io/dbaseapi/FieldDescriptor.java $
002
003 /*----------------------------------------------------------------------------
004 This file is part of deegree, http://deegree.org/
005 Copyright (C) 2001-2009 by:
006 Department of Geography, University of Bonn
007 and
008 lat/lon GmbH
009
010 This library is free software; you can redistribute it and/or modify it under
011 the terms of the GNU Lesser General Public License as published by the Free
012 Software Foundation; either version 2.1 of the License, or (at your option)
013 any later version.
014 This library is distributed in the hope that it will be useful, but WITHOUT
015 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
016 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
017 details.
018 You should have received a copy of the GNU Lesser General Public License
019 along with this library; if not, write to the Free Software Foundation, Inc.,
020 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
021
022 Contact information:
023
024 lat/lon GmbH
025 Aennchenstr. 19, 53177 Bonn
026 Germany
027 http://lat-lon.de/
028
029 Department of Geography, University of Bonn
030 Prof. Dr. Klaus Greve
031 Postfach 1147, 53001 Bonn
032 Germany
033 http://www.geographie.uni-bonn.de/deegree/
034
035 e-mail: info@deegree.org
036 ----------------------------------------------------------------------------*/
037
038 package org.deegree.io.dbaseapi;
039
040 /**
041 * Class representing a field descriptor of a dBase III/IV file
042 *
043 * @version 28.04.2000
044 * @author Andreas Poth
045 */
046
047 public class FieldDescriptor {
048
049 /**
050 * fieldinformation as byte array
051 */
052 private byte[] data = null;
053
054 /**
055 * constructor recieves name and type of the field, the length of the field in bytes and the
056 * decimalcount. the decimalcount is only considered if type id "N" or "F", it's maxvalue if
057 * fieldlength - 2!
058 */
059 public FieldDescriptor( String name, String type, byte fieldlength, byte decimalcount ) throws DBaseException {
060
061 if ( ( !type.equalsIgnoreCase( "C" ) ) && ( !type.equalsIgnoreCase( "D" ) ) && ( !type.equalsIgnoreCase( "F" ) )
062 && ( !type.equalsIgnoreCase( "N" ) ) && ( !type.equalsIgnoreCase( "M" ) )
063 && ( !type.equalsIgnoreCase( "L" ) ) )
064 throw new DBaseException( "data type is not supported" );
065
066 data = new byte[32];
067
068 // fill first 11 bytes with ASCII zero
069 for ( int i = 0; i <= 10; i++ )
070 data[i] = 0x0;
071
072 // copy name into the first 11 bytes
073 byte[] dum = name.getBytes();
074
075 int cnt = dum.length;
076
077 if ( cnt > 11 )
078 cnt = 11;
079
080 for ( int i = 0; i < cnt; i++ )
081 data[i] = dum[i];
082
083 byte[] b = type.getBytes();
084
085 data[11] = b[0];
086
087 // set fieldlength
088 data[16] = fieldlength;
089
090 // set decimalcount
091 if ( type.equalsIgnoreCase( "N" ) || type.equalsIgnoreCase( "F" ) )
092 data[17] = decimalcount;
093 else
094 data[17] = 0;
095
096 // throw DBaseException if the decimalcount is larger then the
097 // number off fields required for plotting a float number
098 // as string
099 if ( data[17] > data[16] - 2 )
100 throw new DBaseException( "invalid fieldlength and/or decimalcount" );
101
102 // work area id (don't know if it should be 1)
103 data[20] = 1;
104
105 // has no index tag in a MDX file
106 data[31] = 0x00;
107
108 // all other fields are reserved!
109
110 }
111
112 /**
113 * method: public byte[] getFieldDescriptor() returns the field descriptor as byte array
114 */
115 public byte[] getFieldDescriptor() {
116
117 return data;
118
119 }
120
121 }