Package org.apache.cassandra.cql3

Class Maps

java.lang.Object

org.apache.cassandra.cql3.Maps

public abstract class Maps
extends Object

Static helper methods and classes for maps.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Maps.DelayedValue
static class	Maps.DiscarderByKey
static class	Maps.Literal
static class	Maps.Marker
static class	Maps.Putter
static class	Maps.Setter
static class	Maps.SetterByKey
static class	Maps.Value

Method Summary

Modifier and Type	Method	Description
static <T> MapType<?,?>	getExactMapTypeIfKnown(List<Pair<T,T>> entries, Function<T,AbstractType<?>> mapper)	Returns the exact MapType from the entries if it can be known.
static <T> MapType<?,?>	getPreferredCompatibleType(List<Pair<T,T>> entries, Function<T,AbstractType<?>> mapper)
static ColumnSpecification	keySpecOf(ColumnSpecification column)
static <T> String	mapToString(List<Pair<T,T>> entries)	Create a String representation of the list containing the specified elements.
static <T> String	mapToString(List<Pair<T,T>> items, Function<T,String> mapper)	Create a String representation of the map from the specified items associated to the map entries.
static <T extends AssignmentTestable> AssignmentTestable.TestResult	testMapAssignment(ColumnSpecification receiver, List<Pair<T,T>> entries)	Tests that the map with the specified entries can be assigned to the specified column.
static ColumnSpecification	valueSpecOf(ColumnSpecification column)

Methods inherited from class java.lang.Object

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

Method Details

keySpecOf

public static ColumnSpecification keySpecOf(ColumnSpecification column)

valueSpecOf

public static ColumnSpecification valueSpecOf(ColumnSpecification column)

testMapAssignment

public static <T extends AssignmentTestable>
AssignmentTestable.TestResult testMapAssignment(ColumnSpecification receiver,
 List<Pair<T,T>> entries)

Tests that the map with the specified entries can be assigned to the specified column.

Parameters:

receiver - the receiving column

entries - the map entries

mapToString

public static <T> String mapToString(List<Pair<T,T>> entries)

Create a String representation of the list containing the specified elements.

Parameters:

entries - the list elements

Returns:

a String representation of the list

mapToString

public static <T> String mapToString(List<Pair<T,T>> items,
 Function<T,String> mapper)

Create a String representation of the map from the specified items associated to the map entries.

Parameters:

items - items associated to the map entries

mapper - the mapper used to map the items to the String representation of the map entries

Returns:

a String representation of the map

getExactMapTypeIfKnown

public static <T> MapType<?,?> getExactMapTypeIfKnown(List<Pair<T,T>> entries,
 Function<T,AbstractType<?>> mapper)

Returns the exact MapType from the entries if it can be known.

Parameters:

entries - the entries

mapper - the mapper used to retrieve the key and value types from the entries

Returns:

the exact MapType from the entries if it can be known or null

getPreferredCompatibleType

public static <T> MapType<?,?> getPreferredCompatibleType(List<Pair<T,T>> entries,
 Function<T,AbstractType<?>> mapper)