IItemCollection

All Superinterfaces:

java.lang.Iterable<IItemIterable>

All Known Implementing Classes:

EventCollection, SingleEntryItemCollection
```
public interface IItemCollection
extends java.lang.Iterable<IItemIterable>
```
An immutable collection of items.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`IItemCollection`	`apply(IItemFilter filter)`	Creates a new item collection with all items in this collection that pass through the filter.
`<V,C extends IItemConsumer<C>> V`	`getAggregate(IAggregator<V,C> aggregator)`	Calculates an aggregated value for the items in this collection.
`boolean`	`hasItems()`

Methods inherited from interface java.lang.Iterable
forEach, iterator, spliterator

- Method Detail
  - apply
```
IItemCollection apply(IItemFilter filter)
```
    Creates a new item collection with all items in this collection that pass through the filter. The collection may be eagerly or lazily evaluated.
    
    Parameters:
    
    filter - the filter to use when selecting items for the new collection
    
    Returns:
    
    a new collection of items
  - getAggregate
```
<V,C extends IItemConsumer<C>> V getAggregate(IAggregator<V,C> aggregator)
```
    Calculates an aggregated value for the items in this collection.
    
    Type Parameters:
    
    V - aggregate result value type
    
    C - Item consumer type. See IAggregator.
    
    Returns:
    
    the aggregated value
  - hasItems
```
boolean hasItems()
```
    Returns:
    
    true if the collections contains items, false otherwise