org.apache.ignite.internal.processors.cache.query

Class CacheQueryPartitionInfo

java.lang.Object

org.apache.ignite.internal.processors.cache.query.CacheQueryPartitionInfo

public class CacheQueryPartitionInfo
extends Object

Holds the partition calculation info extracted from a query. The query may have several such items associated with it. The query may contain expressions containing key or affinity key. Such expressions can be used as hints to derive small isolated set of partitions the query needs to run on. In case expression contains constant (e.g. _key = 100), the partition can be calculated right away and saved into cache along with the query. In case expression has a parameter (e.g. _key = ?), the effective partition varies with each run of the query. Hence, instead of partition, one must store the info required to calculate partition. The given class holds the required info, so that effective partition can be calculated during query parameter binding.

Constructor Summary

Constructors

Constructor and Description
CacheQueryPartitionInfo(int partId, String cacheName, String tableName, int dataType, int paramIdx)

Method Summary

Modifier and Type	Method and Description
String	cacheName()
int	dataType()
boolean	equals(Object obj)
int	hashCode()
int	paramIdx()
int	partition()
String	tableName()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CacheQueryPartitionInfo

public CacheQueryPartitionInfo(int partId,
                               String cacheName,
                               String tableName,
                               int dataType,
                               int paramIdx)

Parameters:

partId - Partition id, or -1 if parameter binding required.

cacheName - Cache name required for partition calculation.

tableName - Table name required for proper type conversion.

dataType - Required data type id for the query parameter.

paramIdx - Query parameter index required for partition calculation.

Method Detail

partition

public int partition()

Returns:

Partition id, or -1 if parameter binding is required to calculate partition.

cacheName

public String cacheName()

Returns:

Cache name required for partition calculation.

tableName

public String tableName()

Returns:

Table name.

dataType

public int dataType()

Returns:

Required data type for the query parameter.

paramIdx

public int paramIdx()

Returns:

Query parameter index required for partition calculation.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object