com.pow2.dao.datalist
Class ResultSetDataListChunk

java.lang.Object
  com.pow2.dao.datalist.ResultSetDataListChunk

All Implemented Interfaces:

DataList, ResultSetDataList

public class ResultSetDataListChunk

extends Object

implements ResultSetDataList

ResultSetDataListChunk class.

Author:

Claudio Fratarcangeli

Field Summary

protected static org.apache.log4j.Category

cat Log4J category.

Constructor Summary

ResultSetDataListChunk(ResultSetDataList rsDataList, int firstElementIndex, int countOfElements)
Constructor

Method Summary

boolean	absolute(int index) Move the resultSetDataListChunk cursor to a specific row number.
void	beforeFirst() Move the resultSetDataListChunk cursor before the first row of the list.
void	close() Close the data list.
boolean	elementExists(int index) Check if any element exist at the index poition.
Object	get(int index, Object obj) Put object state in item and return it.
boolean	hasNext() Check if the resultSet data list has got another element.
boolean	isEmpty() Check if the resultSetDataListChunk is empty.
DataListIterator	iterator() Get the DataListIterator object.

Methods inherited from class java.lang.Object

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

Field Detail

cat

protected static org.apache.log4j.Category cat

Log4J category.

Constructor Detail

ResultSetDataListChunk

public ResultSetDataListChunk(ResultSetDataList rsDataList,
                              int firstElementIndex,
                              int countOfElements)

Constructor

Parameters:

rsDataList - the resultSetDataList object

firstElementIndex - the index of the first element of the chunk

countOfElements - the number of the chunk elements

Method Detail

iterator

public DataListIterator iterator()
                          throws Exception

Get the DataListIterator object.

Specified by:

iterator in interface DataList

Returns:

the DataListIterator object

Throws:

Exception - if any error occurs

close

public void close()
           throws Exception

Close the data list.
Implementation note: do not close this object !!

Specified by:

close in interface DataList

Throws:

Exception - if any error occurs

get

public Object get(int index,
                  Object obj)
           throws Exception

Put object state in item and return it.
Use rowMapper to map fields of ResultSet to instance variables of item. ResultSet index ranges from 1, while ResultSetDataList index ranges from 0.

Specified by:

get in interface DataList

Parameters:

index - the index value

obj - the item object to fill

Returns:

the item object filled with values retrieved from the resultSet, or null if the input index is out of the bondaries of the chunk

Throws:

Exception - if any error occurs

hasNext

public boolean hasNext()
                throws Exception

Check if the resultSet data list has got another element.

Specified by:

hasNext in interface ResultSetDataList

Returns:

true if the resultSet data list has got another record, false otherwise

Throws:

Exception - if any error occurs

beforeFirst

public void beforeFirst()
                 throws Exception

Move the resultSetDataListChunk cursor before the first row of the list.

Specified by:

beforeFirst in interface ResultSetDataList

Throws:

Exception - if any error occurs

absolute

public boolean absolute(int index)
                 throws Exception

Move the resultSetDataListChunk cursor to a specific row number. Rows are numbered starting from 0.

Specified by:

absolute in interface ResultSetDataList

Parameters:

index - the cursor index value

Returns:

true if the cursor is on the result set; false otherwise

Throws:

Exception - if any error occurs

elementExists

public boolean elementExists(int index)
                      throws Exception

Check if any element exist at the index poition.

Specified by:

elementExists in interface ResultSetDataList

Parameters:

index - the index value

Returns:

true if any element exist at the index poition, false otherwise

Throws:

Exception - if any error occurs

isEmpty

public boolean isEmpty()
                throws Exception

Check if the resultSetDataListChunk is empty.

Specified by:

isEmpty in interface DataList

Returns:

true if the resultSetDataListChunk is empty; false otherwise

Throws:

Exception - if any error occurs