org.openstreetmap.josm.tools

Class SubclassFilteredCollection<S,T extends S>

java.lang.Object

java.util.AbstractCollection<T>

org.openstreetmap.josm.tools.SubclassFilteredCollection<S,T>

Type Parameters:

S - element type of the underlying collection

T - element type of filtered collection (and subclass of S). The predicate must accept only objects of type T.

All Implemented Interfaces:

java.lang.Iterable<T>, java.util.Collection<T>

public class SubclassFilteredCollection<S,T extends S>
extends java.util.AbstractCollection<T>

Filtered view of a collection. (read-only collection, but elements can be changed, of course) Lets you iterate through those elements of a given collection that satisfy a certain condition (imposed by a predicate).

The behaviour of this class is undefined if the underlying collection is changed.

Since:

3147

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	SubclassFilteredCollection.FilterIterator

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Collection<? extends S>	collection
private java.util.function.Predicate<? super S>	predicate
private int	size

Constructor Summary

Constructors

Constructor and Description
SubclassFilteredCollection(java.util.Collection<? extends S> collection, java.util.function.Predicate<? super S> predicate) Constructs a new SubclassFilteredCollection.

Method Summary

Modifier and Type	Method and Description
static <T> SubclassFilteredCollection<T,T>	filter(java.util.Collection<? extends T> collection, java.util.function.Predicate<T> predicate) Create a new filtered collection without any constraints on the predicate type.
boolean	isEmpty()
java.util.Iterator<T>	iterator()
int	size()

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

equals, hashCode, parallelStream, removeIf, spliterator, stream

Methods inherited from interface java.lang.Iterable

forEach

Field Detail

collection

private final java.util.Collection<? extends S> collection

predicate

private final java.util.function.Predicate<? super S> predicate

size

private int size

Constructor Detail

SubclassFilteredCollection

public SubclassFilteredCollection(java.util.Collection<? extends S> collection,
                                  java.util.function.Predicate<? super S> predicate)

Constructs a new SubclassFilteredCollection.

Parameters:

collection - The base collection to filter

predicate - The predicate to use as filter

See Also:

for an alternative way to construct this.

Method Detail

iterator

public java.util.Iterator<T> iterator()

Specified by:

iterator in interface java.lang.Iterable<T extends S>

Specified by:

iterator in interface java.util.Collection<T extends S>

Specified by:

iterator in class java.util.AbstractCollection<T extends S>

size

public int size()

Specified by:

size in interface java.util.Collection<T extends S>

Specified by:

size in class java.util.AbstractCollection<T extends S>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection<T extends S>

Overrides:

isEmpty in class java.util.AbstractCollection<T extends S>

filter

public static <T> SubclassFilteredCollection<T,T> filter(java.util.Collection<? extends T> collection,
                                                         java.util.function.Predicate<T> predicate)

Create a new filtered collection without any constraints on the predicate type.

Type Parameters:

T - The collection type.

Parameters:

collection - The collection to filter.

predicate - The predicate to filter for.

Returns:

The filtered collection. It is a Collection<T>.