ewe.database
Class FieldModifier

java.lang.Object
  ewe.database.FieldModifier

All Implemented Interfaces:

DatabaseTypes, DataValidator, Encodable

public class FieldModifier

extends Object

implements Encodable, DatabaseTypes, DataValidator

Do not use this class directly - it is used and stored internally by the Database.

Field Summary

int	fieldID
int	fieldType
String	modifiedData
int	modifier

Fields inherited from interface ewe.database.DatabaseTypes

BOOLEAN, BYTE_ARRAY, CREATED_FIELD, DATE, DATE_TIME, DECIMAL, DOUBLE, FIRST_SPECIAL_FIELD, FLAG_SYNCHRONIZED, FLAGS_FIELD, INTEGER, JAVA_OBJECT, LONG, MAX_ID, MODIFIED_BY_FIELD, MODIFIED_FIELD, NAME_FIELD, OBJECT_BYTES_FIELD, OBJECT_TEXT_FIELD, OID_FIELD, reservedFieldHeaders, reservedFieldIDs, reservedFieldNames, reservedFieldTypes, SORT_DATE_ONLY, SORT_IGNORE_CASE, SORT_TIME_ONLY, SORT_UNKNOWN_IS_GREATER_THAN_KNOWN, SORT_UNKNOWN_IS_LESS_THAN_KNOWN, STRING, TIME, TIMESTAMP

Constructor Summary

FieldModifier()

Method Summary

boolean	decodeAfterReading(Database db)
protected int	getNextInteger()
void	modify(DatabaseEntry newData, DatabaseEntry oldData)
void	set(Database db, int fieldID, int modifier, Object data)
void	validateEntry(Database db, DatabaseEntry newData, DatabaseEntry oldData) This method can be used to either alter data before it is saved into the database or to abort a particular operation by throwing an InvalidDataException.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, toString

Field Detail

fieldID

public int fieldID

fieldType

public int fieldType

modifier

public int modifier

modifiedData

public String modifiedData

Constructor Detail

FieldModifier

public FieldModifier()

Method Detail

decodeAfterReading

public boolean decodeAfterReading(Database db)
                           throws IOException

Throws:

IOException

getNextInteger

protected int getNextInteger()
                      throws IOException

Throws:

IOException

modify

public void modify(DatabaseEntry newData,
                   DatabaseEntry oldData)
            throws IOException

Throws:

IOException

validateEntry

public void validateEntry(Database db,
                          DatabaseEntry newData,
                          DatabaseEntry oldData)
                   throws IOException

Description copied from interface: DataValidator

This method can be used to either alter data before it is saved into the database or to abort a particular operation by throwing an InvalidDataException.

This method is called under four circumstances.

When a new DatabaseEntry is being saved - in which case the newData parameter holds the new data while the oldData parameter will be null.

When a DatabaseEntry is being modified - in which case the newData parameter holds the new data while the oldData parameter will hold the old data.

When a DatabaseEntry is being deleted - in which case the newData parameter will be null while the oldData parameter will hold the old data.

When a DatabaseEntry is being read - in which case the newData parameter refers to the same object as the oldData parameter (i.e. newData == oldData).

Specified by:

validateEntry in interface DataValidator

Parameters:

db - The Database that holds the data.

newData - The data being saved or changed or read. If you need to modify the data, then modify this parameter.

oldData - The original data before the change or deletion.

Throws:

IOException

set

public void set(Database db,
                int fieldID,
                int modifier,
                Object data)