com.hazelcast.query

Class PagingPredicate

java.lang.Object

com.hazelcast.query.PagingPredicate

All Implemented Interfaces:

DataSerializable, IndexAwarePredicate, Predicate, Serializable

public class PagingPredicate
extends Object
implements IndexAwarePredicate, DataSerializable

This class is a special Predicate which helps to get a page-by-page result of a query Can be constructed with a page-size, an inner predicate for filtering, A comparator for sorting \ This class is not thread-safe and stateless. To be able to reuse for another query, one should call reset()

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PagingPredicate() Used for serialization internally
PagingPredicate(Comparator<Map.Entry> comparator, int pageSize) Construct with a comparator and pageSize results will not be filtered results will be ordered via comparator throws IllegalArgumentException if pageSize is not greater than 0
PagingPredicate(int pageSize) Construct with a pageSize results will not be filtered results will be natural ordered throws IllegalArgumentException if pageSize is not greater than 0
PagingPredicate(Predicate predicate, Comparator<Map.Entry> comparator, int pageSize) Construct with an inner predicate, comparator and pageSize results will be filtered via inner predicate results will be ordered via comparator throws IllegalArgumentException if pageSize is not greater than 0 throws IllegalArgumentException if inner predicate is also PagingPredicate
PagingPredicate(Predicate predicate, int pageSize) Construct with an inner predicate and pageSize results will be filtered via inner predicate results will be natural ordered throws IllegalArgumentException if pageSize is not greater than 0 throws IllegalArgumentException if inner predicate is also PagingPredicate

Method Summary

Methods

Modifier and Type	Method and Description
boolean	apply(Map.Entry mapEntry) Used for delegating filtering to inner predicate
Set<com.hazelcast.query.impl.QueryableEntry>	filter(com.hazelcast.query.impl.QueryContext queryContext) Used if inner predicate is instanceof IndexAwarePredicate for filtering
Map.Entry	getAnchor()
Comparator<Map.Entry>	getComparator()
com.hazelcast.util.IterationType	getIterationType()
int	getPage()
int	getPageSize()
Predicate	getPredicate()
boolean	isIndexed(com.hazelcast.query.impl.QueryContext queryContext) Used if inner predicate is instanceof IndexAwarePredicate for checking if indexed
void	nextPage() setting the page value to next page
void	previousPage() setting the page value to previous page
void	readData(com.hazelcast.nio.ObjectDataInput in) Reads fields from the input stream
void	reset() resets for reuse
void	setIterationType(com.hazelcast.util.IterationType iterationType)
void	writeData(com.hazelcast.nio.ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

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

Constructor Detail

PagingPredicate

public PagingPredicate()

Used for serialization internally

PagingPredicate

public PagingPredicate(int pageSize)

Construct with a pageSize results will not be filtered results will be natural ordered throws IllegalArgumentException if pageSize is not greater than 0

Parameters:

pageSize -

PagingPredicate

public PagingPredicate(Predicate predicate,
               int pageSize)

Construct with an inner predicate and pageSize results will be filtered via inner predicate results will be natural ordered throws IllegalArgumentException if pageSize is not greater than 0 throws IllegalArgumentException if inner predicate is also PagingPredicate

Parameters:

predicate -

pageSize -

PagingPredicate

public PagingPredicate(Comparator<Map.Entry> comparator,
               int pageSize)

Construct with a comparator and pageSize results will not be filtered results will be ordered via comparator throws IllegalArgumentException if pageSize is not greater than 0

Parameters:

comparator -

pageSize -

PagingPredicate

public PagingPredicate(Predicate predicate,
               Comparator<Map.Entry> comparator,
               int pageSize)

Construct with an inner predicate, comparator and pageSize results will be filtered via inner predicate results will be ordered via comparator throws IllegalArgumentException if pageSize is not greater than 0 throws IllegalArgumentException if inner predicate is also PagingPredicate

Parameters:

predicate -

comparator -

pageSize -

Method Detail

filter

public Set<com.hazelcast.query.impl.QueryableEntry> filter(com.hazelcast.query.impl.QueryContext queryContext)

Used if inner predicate is instanceof IndexAwarePredicate for filtering

Specified by:

filter in interface IndexAwarePredicate

Parameters:

queryContext -

Returns:

isIndexed

public boolean isIndexed(com.hazelcast.query.impl.QueryContext queryContext)

Used if inner predicate is instanceof IndexAwarePredicate for checking if indexed

Specified by:

isIndexed in interface IndexAwarePredicate

Parameters:

queryContext -

Returns:

apply

public boolean apply(Map.Entry mapEntry)

Used for delegating filtering to inner predicate

Specified by:

apply in interface Predicate

Parameters:

mapEntry -

Returns:

reset

public void reset()

resets for reuse

nextPage

public void nextPage()

setting the page value to next page

previousPage

public void previousPage()

setting the page value to previous page

getIterationType

public com.hazelcast.util.IterationType getIterationType()

setIterationType

public void setIterationType(com.hazelcast.util.IterationType iterationType)

getPage

public int getPage()

getPageSize

public int getPageSize()

getPredicate

public Predicate getPredicate()

getComparator

public Comparator<Map.Entry> getComparator()

getAnchor

public Map.Entry getAnchor()

writeData

public void writeData(com.hazelcast.nio.ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException

readData

public void readData(com.hazelcast.nio.ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException