com.partnersoft.v3x.apps.MapBrowser.locate
Class PointDatafile

java.lang.Object
  com.partnersoft.v3x.io.formats.ObjectDatafile
      com.partnersoft.v3x.apps.MapBrowser.locate.PointDatafile

public class PointDatafile
extends ObjectDatafile

A datafile for named X, Y points.

Constructor Summary

PointDatafile(java.lang.String filename)

Method Summary

protected int	compareImp(java.io.RandomAccessFile filet, long seekA, long seekB) Subclasses may override this to compare two records directly.
protected int	compareImp(java.io.RandomAccessFile filet, java.lang.Object key) Subclasses may override this to compare the seeked-to record to a key.
protected java.lang.Object	readKeyImp(java.io.RandomAccessFile filet) Subclasses may override this to read the key for a record.
protected void	readRecordImp(java.lang.Object recycleMe, java.io.RandomAccessFile filet) Subclasses must override this to read an object from the fixed-length format, given an object to put the results into.
protected java.lang.Object	readRecordImp(java.io.RandomAccessFile filet) Subclasses must override this to read an object from the fixed-length format.
protected void	writeRecordImp(java.lang.Object source, java.io.RandomAccessFile filet) Subclasses must override this to write out the object in the desired form.

Methods inherited from class com.partnersoft.v3x.io.formats.ObjectDatafile

appendRecord, clear, close, compare, compare, findClosest, getFile, getHeaderSize, getRecordSize, getSize, openRead, openWrite, readHeader, readHeaderImp, readKey, readRecord, readRecord, search, setHeaderSize, setRecordSize, sort, writeHeader, writeHeaderImp, writeRecord

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PointDatafile

public PointDatafile(java.lang.String filename)

Method Detail

writeRecordImp

protected void writeRecordImp(java.lang.Object source,
                              java.io.RandomAccessFile filet)
                       throws java.io.IOException

Description copied from class: ObjectDatafile

Subclasses must override this to write out the object in the desired form. The RandomAccessFile is advanced to the correct spot; just write away.

Specified by:

writeRecordImp in class ObjectDatafile

Throws:

java.io.IOException

readRecordImp

protected java.lang.Object readRecordImp(java.io.RandomAccessFile filet)
                                  throws java.io.IOException

Description copied from class: ObjectDatafile

Subclasses must override this to read an object from the fixed-length format. The RandomAccessFile is advanced to the correct spot; just read away.

Specified by:

readRecordImp in class ObjectDatafile

Throws:

java.io.IOException

readRecordImp

protected void readRecordImp(java.lang.Object recycleMe,
                             java.io.RandomAccessFile filet)
                      throws java.io.IOException

Description copied from class: ObjectDatafile

Subclasses must override this to read an object from the fixed-length format, given an object to put the results into. Quite often, for speed, you don't want to create objects, but reuse them instead. This allows you to do that.

The RandomAccessFile is advanced to the correct spot; just read away.

Specified by:

readRecordImp in class ObjectDatafile

Throws:

java.io.IOException

readKeyImp

protected java.lang.Object readKeyImp(java.io.RandomAccessFile filet)
                               throws java.io.IOException

Description copied from class: ObjectDatafile

Subclasses may override this to read the key for a record. Again, you can assume the file is at the correct location. Default is to simply read the whole record.

Overrides:

readKeyImp in class ObjectDatafile

Throws:

java.io.IOException

compareImp

protected int compareImp(java.io.RandomAccessFile filet,
                         long seekA,
                         long seekB)
                  throws java.io.IOException

Description copied from class: ObjectDatafile

Subclasses may override this to compare two records directly. This must be overridden if you plan on using the sorting or searching features. Pretty standard: -1 means a is less than b; 0 means they are equal; 1 means b is less than a. The parameters include the seek positions for both A and B. Default returns 0.

Overrides:

compareImp in class ObjectDatafile

Throws:

java.io.IOException

compareImp

protected int compareImp(java.io.RandomAccessFile filet,
                         java.lang.Object key)
                  throws java.io.IOException

Description copied from class: ObjectDatafile

Subclasses may override this to compare the seeked-to record to a key. This must be overridden if you plan on using the sorting or searching features. Pretty standard: -1 means a is less than b; 0 means they are equal; 1 means b is less than a. Default is 0.

Overrides:

compareImp in class ObjectDatafile

Throws:

java.io.IOException