Package org.apache.ignite.table

Class TupleHelper

java.lang.Object

org.apache.ignite.table.TupleHelper

public final class TupleHelper
extends Object

Utility class to provide direct access to internals of TupleImpl.

Method Summary

Modifier and Type	Method	Description
static Tuple	copyColumns(Tuple tuple, List<String> normalizedColumnNames)	Copy the specified columns into a new tuple.
static void	setNormalized(Tuple tuple, String normalizedName, @Nullable Object val)	An alternative to Tuple.set(java.lang.String, java.lang.Object) that allows to set a value for a column, which name is already normalized.
static <T> T	valueOrDefault(Tuple tuple, String normalizedName, T defaultValue)	Returns value from a given tuple which corresponds to a specified column.

Methods inherited from class java.lang.Object

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

Method Details

valueOrDefault

@Nullable
public static <T> T valueOrDefault(Tuple tuple,
 String normalizedName,
 @Nullable
 T defaultValue)

Returns value from a given tuple which corresponds to a specified column.

Given name is expected to be normalized, thus it's up to caller to invoke IgniteNameUtils.parseIdentifier(String) prior passing the name to this method.

Type Parameters:

T - A type of the returned value.

Parameters:

tuple - A tuple to get value from.

normalizedName - A column name that is considered to be normalized (e.g result of IgniteNameUtils.parseIdentifier(String)).

defaultValue - A value to return in case tuple doesn't have column with given name.

Returns:

A value from a tuple.

copyColumns

public static Tuple copyColumns(Tuple tuple,
 List<String> normalizedColumnNames)

Copy the specified columns into a new tuple. The specified column names should already be normalized. If a column does not exist in the source tuple it will be skipped.

Parameters:

tuple - Source tuple.

normalizedColumnNames - Column names to be copied.

Returns:

The target tuple, a copy of the original tuple retaining only the specified columns.

setNormalized

public static void setNormalized(Tuple tuple,
 String normalizedName,
 @Nullable
 @Nullable Object val)

An alternative to Tuple.set(java.lang.String, java.lang.Object) that allows to set a value for a column, which name is already normalized.

Since the column name is considered normalized, it's up to caller to invoke IgniteNameUtils.parseIdentifier(java.lang.String) prior passing the name to this method.

Parameters:

tuple - A tuple which column will be set.

normalizedName - A column name that is considered to be normalized (e.g result of IgniteNameUtils.parseIdentifier(java.lang.String)).