io.github.privacystreams.commons.items

Class ItemsOperators

java.lang.Object

io.github.privacystreams.commons.items.ItemsOperators

@PSOperatorWrapper
public class ItemsOperators
extends java.lang.Object

A helper class to access common stream functions

Constructor Summary

Constructors

Constructor and Description
ItemsOperators()

Method Summary

Modifier and Type	Method and Description
static Function<java.util.List<Item>,java.util.List<Item>>	asFieldList() Collect the items in the stream to a list.
static <TValue> Function<java.util.List<Item>,java.util.List<TValue>>	asFieldList(java.lang.String fieldToCollect) Collect the values of a field in the stream to a list.
static Function<java.util.List<Item>,Item>	getItemWithLeast(java.lang.String listField) Select an item from the items that has the least elements in a list field.
static Function<java.util.List<Item>,Item>	getItemWithMax(java.lang.String numField) Select an item from the items that has the max value of a field.
static Function<java.util.List<Item>,Item>	getItemWithMin(java.lang.String numField) Select an item from the items that has the min value of a field.
static Function<java.util.List<Item>,Item>	getItemWithMost(java.lang.String listField) Select an item from the items that has the most elements in a list field.

Methods inherited from class java.lang.Object

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

Constructor Detail

ItemsOperators

public ItemsOperators()

Method Detail

asFieldList

public static Function<java.util.List<Item>,java.util.List<Item>> asFieldList()

Collect the items in the stream to a list. Each element in the list is an instance of Item.

Returns:

the function

asFieldList

public static <TValue> Function<java.util.List<Item>,java.util.List<TValue>> asFieldList(java.lang.String fieldToCollect)

Collect the values of a field in the stream to a list. Each element in the list is the value of the specified field in an item.

Parameters:

fieldToCollect - the name of the field to collect.

Returns:

the function

getItemWithMax

public static Function<java.util.List<Item>,Item> getItemWithMax(java.lang.String numField)

Select an item from the items that has the max value of a field.

Parameters:

numField - the name of the number field

getItemWithMin

public static Function<java.util.List<Item>,Item> getItemWithMin(java.lang.String numField)

Select an item from the items that has the min value of a field.

Parameters:

numField - the name of the number field

getItemWithMost

public static Function<java.util.List<Item>,Item> getItemWithMost(java.lang.String listField)

Select an item from the items that has the most elements in a list field.

Parameters:

listField - the name of the list field

getItemWithLeast

public static Function<java.util.List<Item>,Item> getItemWithLeast(java.lang.String listField)

Select an item from the items that has the least elements in a list field.

Parameters:

listField - the name of the list field