001 //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.3_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 }