org.protelis.lang.datatype.impl

Class LazyField<T>

java.lang.Object

org.protelis.lang.datatype.impl.AbstractField<T>

org.protelis.lang.datatype.impl.LazyField<T>

Type Parameters:

T - field type

All Implemented Interfaces:

java.io.Serializable, Field<T>

public final class LazyField<T>
extends AbstractField<T>

Lazy implementation of a Field.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.protelis.lang.datatype.Field

Field.Builder<T>

Constructor Summary

Constructors

Constructor and Description
LazyField(Field<?> origin, java.util.function.Function<DeviceUID,T> mapper)

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(DeviceUID id) Verifies if some device has an entry in this field.
java.util.Optional<T>	getIfPresent(DeviceUID id)
DeviceUID	getLocalDevice()
java.lang.Iterable<? extends java.util.Map.Entry<DeviceUID,T>>	iterable()
java.lang.Iterable<DeviceUID>	keys()
java.util.stream.Stream<DeviceUID>	keyStream()
int	size() The number of neighbors in this field.
java.util.stream.Stream<? extends java.util.Map.Entry<DeviceUID,T>>	stream()
java.lang.Iterable<T>	values()
java.util.stream.Stream<T>	valueStream()

Methods inherited from class org.protelis.lang.datatype.impl.AbstractField

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.protelis.lang.datatype.Field

foldExcludingLocal, foldExcludingLocal, foldIncludingLocal, foldIncludingLocal, foldKeysExcludingLocal, foldKeysIncludingLocal, foldValuesExcludingLocal, foldValuesIncludingLocal, get, getExpectedType, getLocal, getLocalValue, isEmpty, map, projectOn, reduce, reduce, reduceKeys, reduceValues, toMap

Constructor Detail

LazyField

public LazyField(@Nonnull
                 Field<?> origin,
                 @Nonnull
                 java.util.function.Function<DeviceUID,T> mapper)

Parameters:

origin - the field on which this lazy field is mapping

mapper - the mapping function

Method Detail

iterable

public java.lang.Iterable<? extends java.util.Map.Entry<DeviceUID,T>> iterable()

Returns:

An iterator over the set of neighbor/value pairs

keys

public java.lang.Iterable<DeviceUID> keys()

Returns:

An Iterable for the field keys

keyStream

public java.util.stream.Stream<DeviceUID> keyStream()

Returns:

A Stream for the field keys

valueStream

public java.util.stream.Stream<T> valueStream()

Returns:

A Stream over the set of values

values

public java.lang.Iterable<T> values()

Returns:

An Iterable set of values

stream

public java.util.stream.Stream<? extends java.util.Map.Entry<DeviceUID,T>> stream()

Returns:

A Stream over the set of neighbor/value pairs

getIfPresent

public java.util.Optional<T> getIfPresent(@Nonnull
                                          DeviceUID id)

Parameters:

id - the DeviceUID

Returns:

the associated value wrapped in an Optional, or an Optional.empty() if the device is not aligned.

getLocalDevice

public DeviceUID getLocalDevice()

Returns:

the local Device

containsKey

public boolean containsKey(DeviceUID id)

Description copied from interface: Field

Verifies if some device has an entry in this field. Note to interface implementors: the default version of this method is not optimized for performance and should be overridden.

Parameters:

id - a device UID

Returns:

true if there is an entry in this field for the device

size

public int size()

Description copied from interface: Field

The number of neighbors in this field. Hence, a field that only contains the local value has size 0. Note to Field implementors: the default implementation is inefficient and should be overridden.

Returns:

Number of neighbors with values in the field