root / tags / v1_0_2_Build_898 / libraries / libFMap / src / com / iver / cit / gvsig / fmap / drivers / shp / DbaseFileWriterNIO.java @ 10513
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/*
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* Geotools - OpenSource mapping toolkit
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* (C) 2002, Centre for Computational Geography
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This file is based on an origional contained in the GISToolkit project:
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* http://gistoolkit.sourceforge.net/
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*
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*/
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package com.iver.cit.gvsig.fmap.drivers.shp; |
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import java.io.IOException; |
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import java.nio.ByteBuffer; |
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import java.nio.MappedByteBuffer; |
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import java.nio.channels.FileChannel; |
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import java.nio.channels.WritableByteChannel; |
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import java.nio.charset.Charset; |
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import java.text.FieldPosition; |
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import java.text.NumberFormat; |
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import java.util.Calendar; |
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import java.util.Date; |
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import java.util.Locale; |
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import com.hardcode.gdbms.engine.values.BooleanValue; |
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import com.hardcode.gdbms.engine.values.DateValue; |
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import com.hardcode.gdbms.engine.values.NullValue; |
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import com.hardcode.gdbms.engine.values.NumericValue; |
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import com.hardcode.gdbms.engine.values.StringValue; |
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/** A DbaseFileReader is used to read a dbase III format file.
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* The general use of this class is:
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* <CODE><PRE>
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* DbaseFileHeader header = ...
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* WritableFileChannel out = new FileOutputStream("thefile.dbf").getChannel();
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* DbaseFileWriter w = new DbaseFileWriter(header,out);
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* while ( moreRecords ) {
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* w.write( getMyRecord() );
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* }
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* w.close();
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* </PRE></CODE>
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* You must supply the <CODE>moreRecords</CODE> and <CODE>getMyRecord()</CODE>
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* logic...
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* @author Ian Schneider
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*/
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public class DbaseFileWriterNIO { |
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private DbaseFileHeaderNIO header;
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private DbaseFileWriterNIO.FieldFormatter formatter = new DbaseFileWriterNIO.FieldFormatter(); |
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WritableByteChannel channel;
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private ByteBuffer buffer; |
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private final Number NULL_NUMBER = new Integer(0); |
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private final String NULL_STRING = ""; |
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private final String NULL_DATE = " "; |
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// TODO: READ HEADER AND STABLIST THE RIGHT CHARSET
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private Charset charset = Charset.forName("ISO-8859-1"); |
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/** Create a DbaseFileWriter using the specified header and writing to the given
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* channel.
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* @param header The DbaseFileHeader to write.
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* @param out The Channel to write to.
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* @throws IOException If errors occur while initializing.
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*/
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public DbaseFileWriterNIO(DbaseFileHeaderNIO header,FileChannel out) throws IOException { |
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header.writeHeader(out); |
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this.header = header;
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this.channel = out;
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init(); |
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} |
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private void init() throws IOException { |
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buffer = ByteBuffer.allocateDirect(header.getRecordLength());
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} |
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private void write() throws IOException { |
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buffer.position(0);
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int r = buffer.remaining();
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while ( (r -= channel.write(buffer)) > 0) { |
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; // do nothing
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} |
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} |
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/** Write a single dbase record.
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* @param record The entries to write.
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* @throws IOException If IO error occurs.
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* @throws DbaseFileException If the entry doesn't comply to the header.
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*/
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public void write(Object[] record) throws IOException{ |
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/*
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if (record.length != header.getNumFields()) {
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throw new DbaseFileException("Wrong number of fields " + record.length +
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" expected " + header.getNumFields());
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}
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*/
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buffer.position(0);
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// put the 'not-deleted' marker
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buffer.put( (byte) ' '); |
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for (int i = 0; i < header.getNumFields(); i++) { |
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String fieldString = fieldString(record[i], i);
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// if ( header.getFieldLength(i) != fieldString.getBytes().length) {
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// System.out.println(i + " : " + header.getFieldName(i));
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// }
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buffer.put(fieldString.getBytes(charset.name())); |
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} |
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write(); |
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} |
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/** Write a single dbase record. Useful to update a dbf.
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* @param record The entries to write.
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* @throws IOException If IO error occurs.
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* @throws DbaseFileException If the entry doesn't comply to the header.
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*/
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public void writeRecord(Object[] record, int numReg) throws IOException{ |
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if (!(channel instanceof FileChannel)) { |
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throw new IOException("DbaseFileWriterNIO: channel is not a FileChannel. Cannot position properly"); |
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} |
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if (record.length != header.getNumFields()) {
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throw new IOException("Wrong number of fields " + record.length + |
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" expected " + header.getNumFields());
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} |
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FileChannel fileChannel = (FileChannel) channel; |
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long newPos = header.getHeaderLength() + numReg*header.getRecordLength();
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buffer.position(0);
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// put the 'not-deleted' marker
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buffer.put( (byte) ' '); |
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for (int i = 0; i < header.getNumFields(); i++) { |
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String fieldString = fieldString(record[i], i);
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// if ( header.getFieldLength(i) != fieldString.getBytes().length) {
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// System.out.println(i + " : " + header.getFieldName(i));
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// }
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buffer.put(fieldString.getBytes(charset.name())); |
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} |
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fileChannel.write(buffer, newPos); |
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} |
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private String fieldString(Object obj,final int col) { |
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String o;
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final int fieldLen = header.getFieldLength(col); |
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switch (header.getFieldType(col)) {
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case 'C': |
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case 'c': |
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o = formatter.getFieldString( |
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fieldLen, |
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(obj instanceof NullValue)? NULL_STRING : ((StringValue) obj).getValue()
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); |
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break;
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case 'L': |
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case 'l': |
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o = (obj instanceof NullValue) ? "F" : ((BooleanValue)obj).getValue() == true ? "T" : "F"; |
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break;
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case 'M': |
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case 'G': |
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o = formatter.getFieldString( |
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fieldLen, |
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(obj instanceof NullValue) ? NULL_STRING : ((StringValue) obj).getValue()
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); |
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break;
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/* case 'N':
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case 'n':
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// int?
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if (header.getFieldDecimalCount(col) == 0) {
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o = formatter.getFieldString(
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fieldLen, 0, (Number) (obj == null ? NULL_NUMBER : Double.valueOf(obj.toString()))
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);
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break;
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}
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*/
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case 'N': |
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case 'n': |
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case 'F': |
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case 'f': |
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Number number = null; |
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if(obj instanceof NullValue){ |
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number = NULL_NUMBER; |
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}else{
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NumericValue gVal = (NumericValue) obj; |
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number = new Double(gVal.doubleValue()); |
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} |
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o = formatter.getFieldString(fieldLen, |
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header.getFieldDecimalCount(col), |
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number); |
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break;
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case 'D': |
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case 'd': |
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if (obj instanceof NullValue) |
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o = NULL_DATE; |
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else
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o = formatter.getFieldString(((DateValue)obj).getValue()); |
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break;
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default:
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throw new RuntimeException("Unknown type " + header.getFieldType(col)); |
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} |
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return o;
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} |
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/** Release resources associated with this writer.
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* <B>Highly recommended</B>
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* @throws IOException If errors occur.
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*/
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public void close() throws IOException { |
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// IANS - GEOT 193, bogus 0x00 written. According to dbf spec, optional
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// eof 0x1a marker is, well, optional. Since the original code wrote a
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// 0x00 (which is wrong anyway) lets just do away with this :)
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// - produced dbf works in OpenOffice and ArcExplorer java, so it must
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// be okay.
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// buffer.position(0);
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// buffer.put((byte) 0).position(0).limit(1);
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// write();
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channel.close(); |
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if (buffer instanceof MappedByteBuffer) { |
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// NIOUtilities.clean(buffer);
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} |
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buffer = null;
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channel = null;
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formatter = null;
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} |
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/** Utility for formatting Dbase fields. */
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public static class FieldFormatter { |
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private StringBuffer buffer = new StringBuffer(255); |
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private NumberFormat numFormat = NumberFormat.getNumberInstance(Locale.US); |
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private Calendar calendar = Calendar.getInstance(Locale.US); |
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private String emtpyString; |
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private static final int MAXCHARS = 255; |
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public FieldFormatter() {
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// Avoid grouping on number format
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numFormat.setGroupingUsed(false);
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// build a 255 white spaces string
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StringBuffer sb = new StringBuffer(MAXCHARS); |
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sb.setLength(MAXCHARS); |
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for(int i = 0; i < MAXCHARS; i++) { |
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sb.setCharAt(i, ' ');
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} |
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emtpyString = sb.toString(); |
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} |
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public String getFieldString(int size, String s) { |
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buffer.replace(0, size, emtpyString);
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buffer.setLength(size); |
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if(s != null) { |
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buffer.replace(0, size, s);
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if(s.length() <= size) {
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for(int i = s.length(); i < size; i++) { |
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buffer.append(' ');
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} |
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} |
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} |
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buffer.setLength(size); |
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return buffer.toString();
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} |
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public String getFieldString(Date d) { |
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if(d != null) { |
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buffer.delete(0, buffer.length());
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calendar.setTime(d); |
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int year = calendar.get(Calendar.YEAR); |
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int month = calendar.get(Calendar.MONTH) + 1; // returns 0 based month? |
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int day = calendar.get(Calendar.DAY_OF_MONTH); |
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if(year < 1000) { |
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if(year >= 100) { |
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buffer.append("0");
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} else if(year >= 10) { |
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buffer.append("00");
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} else {
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buffer.append("000");
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} |
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} |
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buffer.append(year); |
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if(month < 10) { |
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buffer.append("0");
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} |
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buffer.append(month); |
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if(day < 10) { |
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buffer.append("0");
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} |
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buffer.append(day); |
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} else {
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buffer.setLength(8);
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buffer.replace(0, 8, emtpyString); |
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} |
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buffer.setLength(8);
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return buffer.toString();
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} |
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public String getFieldString(int size, int decimalPlaces, Number n) { |
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buffer.delete(0, buffer.length());
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if (n != null) { |
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numFormat.setMaximumFractionDigits(decimalPlaces); |
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numFormat.setMinimumFractionDigits(decimalPlaces); |
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numFormat.format(n, buffer, new FieldPosition(NumberFormat.INTEGER_FIELD)); |
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} |
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int diff = size - buffer.length();
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if (diff >= 0) { |
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while (diff-- > 0) { |
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buffer.insert(0, ' '); |
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} |
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} else {
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buffer.setLength(size); |
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} |
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return buffer.toString();
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} |
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} |
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public void setCharset(Charset charset) { |
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this.charset = charset;
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} |
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} |