DbaseFileHeader (Geotools modules 21.0 API)

Object
- DbaseFileHeader

```
public class DbaseFileHeader
extends Object
```
Class to represent the header of a Dbase III file. Creation date: (5/15/2001 5:15:30 PM)

Field Summary

Fields
Modifier and Type	Field and Description
`static long`	`MILLIS_SINCE_4713` Returns the number of millis at January 1st 4713 BC Calendar refCal = (Calendar) new GregorianCalendar(TimeZone.getTimeZone("UTC")); refCal.set(Calendar.ERA, GregorianCalendar.BC); refCal.set(Calendar.YEAR, 4713); refCal.set(Calendar.MONTH, Calendar.JANUARY); refCal.set(Calendar.DAY_OF_MONTH, 1); refCal.set(Calendar.HOUR, 12); refCal.set(Calendar.MINUTE, 0); refCal.set(Calendar.SECOND, 0); refCal.set(Calendar.MILLISECOND, 0); MILLIS_SINCE_4713 = refCal.getTimeInMillis() - 43200000L; //(43200000L: 12 hour correction factor taken from DBFViewer2000)

Constructor Summary

Constructors
Constructor and Description

DbaseFileHeader()

Constructors
Constructor and Description
`DbaseFileHeader()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addColumn(String inFieldName, char inFieldType, int inFieldLength, int inDecimalCount)` Add a column to this DbaseFileHeader.
`Class`	`getFieldClass(int i)` Determine the most appropriate Java Class for representing the data in the field.
`int`	`getFieldDecimalCount(int inIndex)` Get the decimal count of this field.
`int`	`getFieldLength(int inIndex)` Returns the field length in bytes.
`String`	`getFieldName(int inIndex)` Get the field name.
`char`	`getFieldType(int inIndex)` Get the character class of the field.
`int`	`getHeaderLength()` Get the length of the header
`int`	`getLargestFieldSize()` Get the largest field size of this table.
`Date`	`getLastUpdateDate()` Get the date this file was last updated.
`long`	`getLengthForRecords(int records)` Returns the expected file size for the given number of records in the file
`int`	`getNumFields()` Return the number of fields in the records.
`int`	`getNumRecords()` Return the number of records in the file
`int`	`getRecordLength()` Get the length of the records in bytes.
`void`	`readHeader(ByteBuffer in)` Read the header data from the DBF file.
`void`	`readHeader(ReadableByteChannel channel)` Read the header data from the DBF file.
`void`	`readHeader(ReadableByteChannel channel, Charset charset)` Read the header data from the DBF file.
`int`	`removeColumn(String inFieldName)` Remove a column from this DbaseFileHeader.
`void`	`setNumRecords(int inNumRecords)` Set the number of records in the file
`String`	`toString()` Get a simple representation of this header.
`void`	`writeHeader(WritableByteChannel out)` Write the header data to the DBF file.

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - MILLIS_SINCE_4713
```
public static long MILLIS_SINCE_4713
```
    Returns the number of millis at January 1st 4713 BC
    Calendar refCal = (Calendar) new GregorianCalendar(TimeZone.getTimeZone("UTC")); refCal.set(Calendar.ERA, GregorianCalendar.BC); refCal.set(Calendar.YEAR, 4713); refCal.set(Calendar.MONTH, Calendar.JANUARY); refCal.set(Calendar.DAY_OF_MONTH, 1); refCal.set(Calendar.HOUR, 12); refCal.set(Calendar.MINUTE, 0); refCal.set(Calendar.SECOND, 0); refCal.set(Calendar.MILLISECOND, 0); MILLIS_SINCE_4713 = refCal.getTimeInMillis() - 43200000L; //(43200000L: 12 hour correction factor taken from DBFViewer2000)
- Constructor Detail
  - DbaseFileHeader
```
public DbaseFileHeader()
```
- Method Detail
  - getFieldClass
```
public Class getFieldClass(int i)
```
    Determine the most appropriate Java Class for representing the data in the field.
```
 All packages are java.lang unless otherwise specified.
 C (Character) -> String
 N (Numeric)   -> Integer or Long or Double (depends on field's decimal count and fieldLength)
 F (Floating)  -> Double
 L (Logical)   -> Boolean
 D (Date)      -> java.util.Date (Without time)
```
    Parameters:
    
    i - The index of the field, from 0 to getNumFields() - 1 .
    
    Returns:
    
    A Class which closely represents the dbase field type.
  - addColumn
```
public void addColumn(String inFieldName,
                      char inFieldType,
                      int inFieldLength,
                      int inDecimalCount)
               throws DbaseFileException
```
    Add a column to this DbaseFileHeader. The type is one of (C N L or D) character, number, logical(true/false), or date. The Field length is the total length in bytes reserved for this column. The decimal count only applies to numbers(N), and floating point values (F), and refers to the number of characters to reserve after the decimal point. Don't expect miracles from this...
```
 Field Type MaxLength
 ---------- ---------
 C          254
 D          8
```
    Parameters:
    
    inFieldName - The name of the new field, must be less than 10 characters or it gets truncated.
    
    inFieldType - A character representing the dBase field, ( see above ). Case insensitive.
    
    inFieldLength - The length of the field, in bytes ( see above )
    
    inDecimalCount - For numeric fields, the number of decimal places to track.
    
    Throws:
    
    DbaseFileException - If the type is not recognized.
  - removeColumn
```
public int removeColumn(String inFieldName)
```
    Remove a column from this DbaseFileHeader.
    
    Parameters:
    
    inFieldName - The name of the field, will ignore case and trim.
    
    Returns:
    
    index of the removed column, -1 if no found
  - getFieldLength
```
public int getFieldLength(int inIndex)
```
    Returns the field length in bytes.
    
    Parameters:
    
    inIndex - The field index.
    
    Returns:
    
    The length in bytes.
  - getFieldDecimalCount
```
public int getFieldDecimalCount(int inIndex)
```
    Get the decimal count of this field.
    
    Parameters:
    
    inIndex - The field index.
    
    Returns:
    
    The decimal count.
  - getFieldName
```
public String getFieldName(int inIndex)
```
    Get the field name.
    
    Parameters:
    
    inIndex - The field index.
    
    Returns:
    
    The name of the field.
  - getFieldType
```
public char getFieldType(int inIndex)
```
    Get the character class of the field.
    
    Parameters:
    
    inIndex - The field index.
    
    Returns:
    
    The dbase character representing this field.
  - getLastUpdateDate
```
public Date getLastUpdateDate()
```
    Get the date this file was last updated.
    
    Returns:
    
    The Date last modified.
  - getNumFields
```
public int getNumFields()
```
    Return the number of fields in the records.
    
    Returns:
    
    The number of fields in this table.
  - getNumRecords
```
public int getNumRecords()
```
    Return the number of records in the file
    
    Returns:
    
    The number of records in this table.
  - getRecordLength
```
public int getRecordLength()
```
    Get the length of the records in bytes.
    
    Returns:
    
    The number of bytes per record.
  - getHeaderLength
```
public int getHeaderLength()
```
    Get the length of the header
    
    Returns:
    
    The length of the header in bytes.
  - readHeader
```
public void readHeader(ReadableByteChannel channel)
                throws IOException
```
    Read the header data from the DBF file.
    
    Parameters:
    
    channel - A readable byte channel. If you have an InputStream you need to use, you can call java.nio.Channels.getChannel(InputStream in).
    
    Throws:
    
    IOException - If errors occur while reading.
  - readHeader
```
public void readHeader(ReadableByteChannel channel,
                       Charset charset)
                throws IOException
```
    Read the header data from the DBF file.
    
    Parameters:
    
    channel - A readable byte channel. If you have an InputStream you need to use, you can call java.nio.Channels.getChannel(InputStream in).
    
    Throws:
    
    IOException - If errors occur while reading.
  - readHeader
```
public void readHeader(ByteBuffer in)
                throws IOException
```
    Read the header data from the DBF file.
    
    Parameters:
    
    channel - A readable byte channel. If you have an InputStream you need to use, you can call java.nio.Channels.getChannel(InputStream in).
    
    Throws:
    
    IOException - If errors occur while reading.
  - getLargestFieldSize
```
public int getLargestFieldSize()
```
    Get the largest field size of this table.
    
    Returns:
    
    The largest field size in bytes.
  - setNumRecords
```
public void setNumRecords(int inNumRecords)
```
    Set the number of records in the file
    
    Parameters:
    
    inNumRecords - The number of records.
  - writeHeader
```
public void writeHeader(WritableByteChannel out)
                 throws IOException
```
    Write the header data to the DBF file.
    
    Parameters:
    
    out - A channel to write to. If you have an OutputStream you can obtain the correct channel by using java.nio.Channels.newChannel(OutputStream out).
    
    Throws:
    
    IOException - If errors occur.
  - toString
```
public String toString()
```
    Get a simple representation of this header.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    A String representing the state of the header.
  - getLengthForRecords
```
public long getLengthForRecords(int records)
```
    Returns the expected file size for the given number of records in the file
    
    Parameters:
    
    records -
    
    Returns:

Class DbaseFileHeader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class Object

Field Detail

MILLIS_SINCE_4713

Constructor Detail

DbaseFileHeader

Method Detail

getFieldClass

addColumn

removeColumn

getFieldLength

getFieldDecimalCount

getFieldName

getFieldType

getLastUpdateDate

getNumFields

getNumRecords

getRecordLength

getHeaderLength

readHeader

readHeader

readHeader

getLargestFieldSize

setNumRecords

writeHeader

toString

getLengthForRecords