root / trunk / libraries / libFMap / src / com / iver / cit / gvsig / fmap / drivers / dbf / DbaseFile.java @ 28367
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/*
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* Created on 16-feb-2004
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*
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* To change the template for this generated file go to
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* Window>Preferences>Java>Code Generation>Code and Comments
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*/
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package com.iver.cit.gvsig.fmap.drivers.dbf; |
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/**
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*/
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import java.io.File; |
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import java.io.FileNotFoundException; |
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import java.io.IOException; |
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import java.io.RandomAccessFile; |
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import java.io.UnsupportedEncodingException; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.FileChannel; |
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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.driver.exceptions.FileNotFoundDriverException; |
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import com.iver.utiles.bigfile.BigByteBuffer2; |
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/**
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* Class to read and write data to a dbase III format file. Creation date:
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* (5/15/2001 5:15:13 PM)
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*/
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public class DbaseFile { |
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// Header information for the DBase File
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private DbaseFileHeader myHeader;
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private RandomAccessFile raf; |
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private FileChannel channel; |
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private BigByteBuffer2 buffer;
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private FileChannel.MapMode mode; |
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private FieldFormatter formatter = new FieldFormatter(); |
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private int posActual = -1; |
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private int recordOffset; |
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private ByteBuffer cachedRecord = null; |
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private byte[] bytesCachedRecord = null; |
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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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private Charset chars; |
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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 |
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.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 |
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// 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( |
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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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// Retrieve number of records in the DbaseFile
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public int getRecordCount() { |
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return myHeader.getNumRecords();
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} |
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/**
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public int getFieldCount() { |
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return myHeader.getNumFields();
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} |
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/**
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* DOCUMENT ME!
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*
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* @param rowIndex
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* DOCUMENT ME!
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* @param fieldId
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public boolean getBooleanFieldValue(int rowIndex, int fieldId) { |
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int recordOffset = (myHeader.getRecordLength() * rowIndex)
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+ myHeader.getHeaderLength() + 1;
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// Se calcula el offset del campo
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int fieldOffset = 0; |
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for (int i = 0; i < (fieldId - 1); i++) { |
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fieldOffset += myHeader.getFieldLength(i); |
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} |
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buffer.position(recordOffset + fieldOffset); |
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char bool = (char) buffer.get(); |
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return ((bool == 't') || (bool == 'T') || (bool == 'Y') || (bool == 'y')); |
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} |
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/**
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* DOCUMENT ME!
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*
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* @param rowIndex
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* DOCUMENT ME!
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* @param fieldId
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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* @throws UnsupportedEncodingException
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*/
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public String getStringFieldValue(int rowIndex, int fieldId) |
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throws UnsupportedEncodingException { |
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try{
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int fieldOffset = myHeader.getFieldDescription(fieldId).myFieldDataAddress;
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byte[] data = new byte[myHeader.getFieldLength(fieldId)]; |
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if (rowIndex != posActual) {
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recordOffset = (myHeader.getRecordLength() * rowIndex) |
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+ myHeader.getHeaderLength() + 1;
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/*
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* System.err.println("getStringFieldValue: rowIndex = " +
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* rowIndex); System.err.println("recordOffset = " + recordOffset + "
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* fieldOffset=" + fieldOffset);
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*/
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buffer.position(recordOffset); |
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buffer.get(bytesCachedRecord); |
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cachedRecord = ByteBuffer.wrap(bytesCachedRecord);
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posActual = rowIndex; |
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} |
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cachedRecord.position(fieldOffset); |
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cachedRecord.get(data); |
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return new String(data, chars.name()); |
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}catch (Exception e) { |
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return ""; |
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} |
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} |
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public void setFieldValue(int rowIndex, int fieldId, Object obj) |
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throws IOException { |
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int fieldOffset = myHeader.getFieldDescription(fieldId).myFieldDataAddress;
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String str = fieldString(obj, fieldId);
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byte[] data = new byte[myHeader.getFieldLength(fieldId)]; |
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recordOffset = (myHeader.getRecordLength() * rowIndex) |
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+ myHeader.getHeaderLength() + 1;
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ByteBuffer aux = ByteBuffer.wrap(data); |
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aux.put(str.getBytes(chars.name())); |
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// raf.seek(recordOffset + fieldOffset);
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// raf.writeBytes(str);
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aux.flip(); |
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int numBytesWritten = channel.write(aux, recordOffset + fieldOffset);
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//channel.force(true);
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} |
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/**
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* Retrieve the name of the given column.
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*
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* @param inIndex
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public String getFieldName(int inIndex) { |
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return myHeader.getFieldName(inIndex).trim();
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} |
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/**
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* Retrieve the type of the given column.
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*
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* @param inIndex
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public char getFieldType(int inIndex) { |
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return myHeader.getFieldType(inIndex);
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} |
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/**
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* Retrieve the length of the given column.
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*
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* @param inIndex
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public int getFieldLength(int inIndex) { |
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return myHeader.getFieldLength(inIndex);
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} |
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/*
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* Retrieve the value of the given column as string.
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*
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* @param idField DOCUMENT ME! @param idRecord DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*
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* public Object getFieldValue(int idField, long idRecord) throws
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* IOException { Object[] tmpReg = getRecord(idRecord); return
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* tmpReg[idField]; }
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*/
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/*
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* DOCUMENT ME!
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*
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* @param idField DOCUMENT ME! @param idRecord DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*
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* public double getFieldValueAsDouble(int idField, int idRecord) throws
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* IOException { Object[] tmpReg = getRecord(idRecord); return (double)
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* Double.parseDouble(tmpReg[idField].toString()); }
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*/
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/**
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* Retrieve the location of the decimal point.
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*
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* @param inIndex
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* DOCUMENT ME!
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*
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* @return DOCUMENT ME!
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*/
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public int getFieldDecimalLength(int inIndex) { |
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return myHeader.getFieldDecimalCount(inIndex);
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} |
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/**
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* read the DBF file into memory.
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*
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* @param file
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* DOCUMENT ME!
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*
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* @throws IOException
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* DOCUMENT ME!
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*/
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public void open(File file) throws FileNotFoundDriverException { |
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/*
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* 01h DOS USA code page 437 02h DOS Multilingual code page 850 03h
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* Windows ANSI code page 1252 04h Standard Macintosh 64h EE MS-DOS code
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* page 852 65h Nordic MS-DOS code page 865 66h Russian MS-DOS code page
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* 866 67h Icelandic MS-DOS 68h Kamenicky (Czech) MS-DOS 69h Mazovia
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* (Polish) MS-DOS 6Ah Greek MS-DOS (437G) 6Bh Turkish MS-DOS 96h
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* Russian Macintosh 97h Eastern European Macintosh 98h Greek Macintosh
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* C8h Windows EE code page 1250 C9h Russian Windows CAh Turkish Windows
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* CBh Greek Windows
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*/
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try {
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if (file.canWrite()) {
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try {
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raf = new RandomAccessFile(file, "rw"); |
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mode = FileChannel.MapMode.READ_WRITE;
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} catch (FileNotFoundException e) { |
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raf = new RandomAccessFile(file, "r"); |
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mode = FileChannel.MapMode.READ_ONLY;
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} |
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} else {
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raf = new RandomAccessFile(file, "r"); |
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mode = FileChannel.MapMode.READ_ONLY;
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} |
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channel = raf.getChannel(); |
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// buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0,
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// channel.size());
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buffer = new BigByteBuffer2(channel, mode);
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// create the header to contain the header information.
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myHeader = new DbaseFileHeader();
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myHeader.readHeader(buffer); |
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switch (myHeader.getLanguageID()) {
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case 0x01: |
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chars = Charset.forName("US-ASCII"); |
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break;
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case 0x02: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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case 0x03: |
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chars = Charset.forName("windows-1252"); |
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break;
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case 0x04: |
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chars = Charset.forName("mac"); |
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break;
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case 0x64: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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case 0x65: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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case 0x66: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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case 0x67: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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case 0x68: |
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chars = Charset.forName("greek"); |
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break;
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case 0x69: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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case 0x6A: |
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chars = Charset.forName("greek"); |
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break;
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case 0x6B: |
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chars = Charset.forName("ISO-8859-1"); |
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break;
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default:
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chars = Charset.forName("ISO-8859-1"); |
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} |
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bytesCachedRecord = new byte[myHeader.getRecordLength()]; |
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}catch (IOException e) { |
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throw new FileNotFoundDriverException("DBF",e,file.getAbsolutePath()); |
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} |
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} |
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/**
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* Removes all data from the dataset
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*
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* @throws IOException
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* DOCUMENT ME!
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*/
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public void close() throws IOException { |
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raf.close(); |
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channel.close(); |
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buffer = null;
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posActual=-1;
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} |
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public FileChannel getWriteChannel() { |
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return channel;
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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 = myHeader.getFieldLength(col); |
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switch (myHeader.getFieldType(col)) {
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case 'C': |
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case 'c': |
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o = formatter.getFieldString(fieldLen, (obj == null) ? NULL_STRING
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: ((String) obj));
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break;
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case 'L': |
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case 'l': |
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o = (obj == null) ? "F" |
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: ((Boolean) obj).booleanValue() == 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(fieldLen, (obj == null) ? NULL_STRING
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: ((String) obj));
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break;
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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 == null) { |
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number = NULL_NUMBER; |
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} else {
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Number gVal = (Number) obj; |
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number = new Double(gVal.doubleValue()); |
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} |
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o = formatter.getFieldString(fieldLen, myHeader |
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.getFieldDecimalCount(col), number); |
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break;
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case 'D': |
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case 'd': |
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if (obj == null) |
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o = NULL_DATE; |
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else
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o = formatter.getFieldString(((Date) obj));
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break;
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default:
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throw new RuntimeException("Unknown type " |
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+ myHeader.getFieldType(col)); |
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} |
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return o;
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} |
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|
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} |