org.apache.ignite.internal.processors.query.h2.sql

Class GridAggregateOrderedFunction

java.lang.Object

org.apache.ignite.internal.processors.query.h2.sql.GridAggregateOrderedFunction

All Implemented Interfaces:

org.gridgain.internal.h2.api.AggregateFunction

Direct Known Subclasses:

GridFirstValueFunction, GridLastValueFunction

public class GridAggregateOrderedFunction
extends Object
implements org.gridgain.internal.h2.api.AggregateFunction

SQL aggregate function to select the first or last value in the sorted group.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	asc Ascending order.
protected Comparator<? super Comparable>	comparator Nulls-last comparator.
protected Object[]	currentVal

Constructor Summary

Constructors

Constructor and Description
GridAggregateOrderedFunction(boolean asc, Comparator<? super Comparable> comparator)

Method Summary

Modifier and Type	Method and Description
void	add(Object value)
protected int	compare(Object[] arg1, Object[] arg2) Compares two arrays starting with the first element.
Object	getResult()
int	getType(int[] inputTypes)
void	init(Connection conn)

Methods inherited from class java.lang.Object

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

Field Detail

currentVal

protected Object[] currentVal

asc

protected boolean asc

Ascending order.

comparator

protected Comparator<? super Comparable> comparator

Nulls-last comparator.

Constructor Detail

GridAggregateOrderedFunction

public GridAggregateOrderedFunction(boolean asc,
                                    Comparator<? super Comparable> comparator)

Parameters:

comparator - comparator.

asc - ascending order.

Method Detail

init

public void init(Connection conn)
          throws SQLException

Specified by:

init in interface org.gridgain.internal.h2.api.AggregateFunction

Throws:

SQLException

getType

public int getType(int[] inputTypes)
            throws SQLException

Specified by:

getType in interface org.gridgain.internal.h2.api.AggregateFunction

Throws:

SQLException

add

public void add(Object value)
         throws SQLException

Specified by:

add in interface org.gridgain.internal.h2.api.AggregateFunction

Throws:

SQLException

compare

protected int compare(Object[] arg1,
                      Object[] arg2)
               throws SQLException

Compares two arrays starting with the first element. Elements of arrays should implement Comparable interface.

Parameters:

arg1 - the first array.

arg2 - the second arrays.

Returns:

comparison result.

Throws:

SQLException - if failed.

getResult

public Object getResult()
                 throws SQLException

Specified by:

getResult in interface org.gridgain.internal.h2.api.AggregateFunction

Throws:

SQLException