    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/io/dbaseapi/DBFHeader.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    import org.deegree.model.spatialschema.ByteUtils;
    041
    042    /**
    043     * Class representing the header of a dBase III/IV file
    044     *
    045     * @version 03.05.2000
    046     * @author Andreas Poth
    047     */
    048    public class DBFHeader {
    049
    050        private byte[] header = null;
    051
    052        /**
    053         * constructor retrieves number of fields
    054         */
    055        public DBFHeader( FieldDescriptor[] fieldDesc ) throws DBaseException {
    056
    057            try {
    058                // allocate memory for the header
    059                header = new byte[32 + fieldDesc.length * 32 + 1];
    060
    061                // set file type
    062                header[0] = 3;
    063
    064                // set date YYMMDD
    065                header[1] = 0;
    066                header[2] = 1;
    067                header[3] = 1;
    068
    069                // number of records in the dBase file
    070                ByteUtils.writeLEInt( header, 4, 0 );
    071
    072                // write number of bytes in the header
    073                ByteUtils.writeLEShort( header, 8, header.length );
    074
    075                // set field descriptors and calculate length of the data section
    076                int sum = 0;
    077                for ( int i = 0; i < fieldDesc.length; i++ ) {
    078                    setField( i, fieldDesc[i] );
    079                    byte[] data = fieldDesc[i].getFieldDescriptor();
    080                    sum += data[16];
    081                    data = null;
    082                }
    083
    084                sum++;
    085
    086                // write number of bytes in the record (data section)
    087                ByteUtils.writeLEShort( header, 10, sum );
    088
    089                // set field terminator
    090                header[header.length - 1] = 0x0D;
    091            } catch ( Exception e ) {
    092                e.printStackTrace();
    093                throw new DBaseException( e.getMessage() );
    094            }
    095
    096        }
    097
    098        /**
    099         * method: public void setField(int index, FieldDescriptor fd) puts a field on the header byte
    100         * array
    101         */
    102        private void setField( int index, FieldDescriptor fd ) {
    103
    104            // get field descriptor data
    105            byte[] fddata = fd.getFieldDescriptor();
    106
    107            // put field descriptor data on header byte array
    108            for ( int i = 0; i < 32; i++ ) {
    109                header[32 + ( index * 32 ) + i] = fddata[i];
    110            }
    111
    112        }
    113
    114        /**
    115         * method: public byte[] getHeader() throws DBaseException returns the header as a byte array
    116         *
    117         */
    118        public byte[] getHeader() {
    119            return header;
    120        }
    121
    122    }