de.aristaflow.adept2.core.eventmanager.dbevents

Class WindowedMemoryResultSet

java.lang.Object

de.aristaflow.adept2.core.eventmanager.dbevents.WindowedMemoryResultSet

All Implemented Interfaces:

MemoryResultSet, java.io.Serializable

public class WindowedMemoryResultSet
extends java.lang.Object
implements MemoryResultSet

A wrapper for a MemoryResultSet providing a window for accessing the rows. This allows to restrict access to only specific consecutive rows.
If several event handlers use the very same memory result set (event), this allows for previous handlers to consume rows and the following handlers to see only non-consumed rows.

The window only applies to rows, there are no restrictions on columns.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	firstRow The first row in the wrapped result set being part of the window.
protected MemoryResultSet	resultSet The wrapped result set.
protected int	rowCount The amount of rows within the windows.

Constructor Summary

Constructors

Constructor and Description
WindowedMemoryResultSet(MemoryResultSet resultSet, int firstRow, int rowCount) Creates a new WindowedMemoryResultSet wrapping the designated MemoryResultSet and only allowing access to the rows starting with the designated first row and for the designated count (or the maximum amount of rows in the designated result set, whichever is less).

Method Summary

Modifier and Type	Method and Description
int	getColumnCount() Gets the amount of columns of this memory result set.
java.lang.String	getColumnLabel(int column) Gets the label for the designated column.
ProcessConstants.AdeptDataType	getColumnType(int column) Gets the data type for the designated column.
int	getRowCount() Gets the amount of rows of this memory result set.
java.io.Serializable[]	getValues(int row) Gets the values for the designated rows.

Methods inherited from class java.lang.Object

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

Field Detail

resultSet

protected final MemoryResultSet resultSet

The wrapped result set.

firstRow

protected final int firstRow

The first row in the wrapped result set being part of the window.

rowCount

protected final int rowCount

The amount of rows within the windows. This will not exceed the actual row count of the wrapped result set.

Constructor Detail

WindowedMemoryResultSet

public WindowedMemoryResultSet(MemoryResultSet resultSet,
                               int firstRow,
                               int rowCount)

Creates a new WindowedMemoryResultSet wrapping the designated MemoryResultSet and only allowing access to the rows starting with the designated first row and for the designated count (or the maximum amount of rows in the designated result set, whichever is less).

Parameters:

resultSet - The result set to be wrapped for providing restricted row access.

firstRow - The first row which to provide via the created windowed result set based on the wrapped result set.

rowCount - The amount of rows of the window. This will be reduced if the designated result set does not have enough rows.

Method Detail

getColumnCount

public int getColumnCount()

Description copied from interface: MemoryResultSet

Gets the amount of columns of this memory result set.

Specified by:

getColumnCount in interface MemoryResultSet

Returns:

The amount of columns of this memory result set.

getRowCount

public int getRowCount()

Description copied from interface: MemoryResultSet

Gets the amount of rows of this memory result set.

Specified by:

getRowCount in interface MemoryResultSet

Returns:

The amount of rows of this memory result set.

getColumnLabel

public java.lang.String getColumnLabel(int column)

Description copied from interface: MemoryResultSet

Gets the label for the designated column. The column has to be >= 0 and <MemoryResultSet.getColumnCount().

Specified by:

getColumnLabel in interface MemoryResultSet

Parameters:

column - The column for which to get the label.

Returns:

The label of the designated column.

getColumnType

public ProcessConstants.AdeptDataType getColumnType(int column)

Description copied from interface: MemoryResultSet

Gets the data type for the designated column. The column has to be >= 0 and <MemoryResultSet.getColumnCount().

Specified by:

getColumnType in interface MemoryResultSet

Parameters:

column - The column for which to get the data type.

Returns:

The data type of the designated column.

getValues

public java.io.Serializable[] getValues(int row)

Description copied from interface: MemoryResultSet

Gets the values for the designated rows. The row has to be >= 0 and < MemoryResultSet.getRowCount(). The values in the array are of the Java-type corresponding to the ProcessConstants.AdeptDataType of the corresponding column. null represents a usual null.

Specified by:

getValues in interface MemoryResultSet

Parameters:

row - The row for which to get the values.

Returns:

The values for the designated row.