org.apache.flink.api.java.typeutils

Class MapTypeInfo<K,V>

java.lang.Object

org.apache.flink.api.common.typeinfo.TypeInformation<Map<K,V>>

org.apache.flink.api.java.typeutils.MapTypeInfo<K,V>

Type Parameters:

K - The type of the keys in the map.

V - The type of the values in the map.

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

MultisetTypeInfo

@PublicEvolving
public class MapTypeInfo<K,V>
extends TypeInformation<Map<K,V>>

Special TypeInformation used by MapStateDescriptor.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MapTypeInfo(Class<K> keyClass, Class<V> valueClass)
MapTypeInfo(TypeInformation<K> keyTypeInfo, TypeInformation<V> valueTypeInfo)

Method Summary

Modifier and Type	Method and Description
boolean	canEqual(Object obj) Returns true if the given object can be equaled with this object.
TypeSerializer<Map<K,V>>	createSerializer(ExecutionConfig config) Creates a serializer for the type.
boolean	equals(Object obj)
int	getArity() Gets the arity of this type - the number of fields without nesting.
TypeInformation<K>	getKeyTypeInfo() Gets the type information for the keys in the map
int	getTotalFields() Gets the number of logical fields in this type.
Class<Map<K,V>>	getTypeClass() Gets the class of the type represented by this type information.
TypeInformation<V>	getValueTypeInfo() Gets the type information for the values in the map
int	hashCode()
boolean	isBasicType() Checks if this type information represents a basic type.
boolean	isKeyType() Checks whether this type can be used as a key.
boolean	isTupleType() Checks if this type information represents a Tuple type.
String	toString()

Methods inherited from class org.apache.flink.api.common.typeinfo.TypeInformation

getGenericParameters, isSortKeyType, of, of

Methods inherited from class java.lang.Object

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

Constructor Detail

MapTypeInfo

public MapTypeInfo(TypeInformation<K> keyTypeInfo,
                   TypeInformation<V> valueTypeInfo)

MapTypeInfo

public MapTypeInfo(Class<K> keyClass,
                   Class<V> valueClass)

Method Detail

getKeyTypeInfo

public TypeInformation<K> getKeyTypeInfo()

Gets the type information for the keys in the map

getValueTypeInfo

public TypeInformation<V> getValueTypeInfo()

Gets the type information for the values in the map

isBasicType

public boolean isBasicType()

Description copied from class: TypeInformation

Checks if this type information represents a basic type. Basic types are defined in BasicTypeInfo and are primitives, their boxing types, Strings, Date, Void, ...

Specified by:

isBasicType in class TypeInformation<Map<K,V>>

Returns:

True, if this type information describes a basic type, false otherwise.

isTupleType

public boolean isTupleType()

Description copied from class: TypeInformation

Checks if this type information represents a Tuple type. Tuple types are subclasses of the Java API tuples.

Specified by:

isTupleType in class TypeInformation<Map<K,V>>

Returns:

True, if this type information describes a tuple type, false otherwise.

getArity

public int getArity()

Description copied from class: TypeInformation

Gets the arity of this type - the number of fields without nesting.

Specified by:

getArity in class TypeInformation<Map<K,V>>

Returns:

Gets the number of fields in this type without nesting.

getTotalFields

public int getTotalFields()

Description copied from class: TypeInformation

Gets the number of logical fields in this type. This includes its nested and transitively nested fields, in the case of composite types. In the example below, the OuterType type has three fields in total.

The total number of fields must be at least 1.

Specified by:

getTotalFields in class TypeInformation<Map<K,V>>

Returns:

The number of fields in this type, including its sub-fields (for composite types)

getTypeClass

public Class<Map<K,V>> getTypeClass()

Description copied from class: TypeInformation

Gets the class of the type represented by this type information.

Specified by:

getTypeClass in class TypeInformation<Map<K,V>>

Returns:

The class of the type represented by this type information.

isKeyType

public boolean isKeyType()

Description copied from class: TypeInformation

Checks whether this type can be used as a key. As a bare minimum, types have to be hashable and comparable to be keys.

Specified by:

isKeyType in class TypeInformation<Map<K,V>>

Returns:

True, if the type can be used as a key, false otherwise.

createSerializer

public TypeSerializer<Map<K,V>> createSerializer(ExecutionConfig config)

Description copied from class: TypeInformation

Creates a serializer for the type. The serializer may use the ExecutionConfig for parameterization.

Specified by:

createSerializer in class TypeInformation<Map<K,V>>

Parameters:

config - The config used to parameterize the serializer.

Returns:

A serializer for this type.

toString

public String toString()

Specified by:

toString in class TypeInformation<Map<K,V>>

equals

public boolean equals(Object obj)

Specified by:

equals in class TypeInformation<Map<K,V>>

hashCode

public int hashCode()

Specified by:

hashCode in class TypeInformation<Map<K,V>>

canEqual

public boolean canEqual(Object obj)

Description copied from class: TypeInformation

Returns true if the given object can be equaled with this object. If not, it returns false.

Specified by:

canEqual in class TypeInformation<Map<K,V>>

Parameters:

obj - Object which wants to take part in the equality relation

Returns:

true if obj can be equaled with this, otherwise false