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    }