org.apache.commons.collections4.list

Class PredicatedList<E>

java.lang.Object

org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>

org.apache.commons.collections4.collection.PredicatedCollection<E>

org.apache.commons.collections4.list.PredicatedList<E>

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, java.util.List<E>

public class PredicatedList<E>
extends PredicatedCollection<E>
implements java.util.List<E>

Decorates another List to validate that all additions match a specified predicate.

This list exists to provide validation for the decorated list. It is normally created to decorate an empty list. If an object cannot be added to the list, an IllegalArgumentException is thrown.

One usage would be to ensure that no null entries are added to the list.

 
 List<String> list =
   PredicatedList.predicatedList(new ArrayList<String>(), PredicateUtils.notNullPredicate());
 
 

This class is Serializable from Commons Collections 3.1.

Since:

3.0

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.collections4.collection.PredicatedCollection

PredicatedCollection.Builder<E>

Method Summary

Modifier and Type	Method and Description
void	add(int index, E object)
boolean	addAll(int index, java.util.Collection<? extends E> coll)
boolean	equals(java.lang.Object object)
E	get(int index)
int	hashCode()
int	indexOf(java.lang.Object object)
int	lastIndexOf(java.lang.Object object)
java.util.ListIterator<E>	listIterator()
java.util.ListIterator<E>	listIterator(int i)
static <T> PredicatedList<T>	predicatedList(java.util.List<T> list, Predicate<? super T> predicate) Factory method to create a predicated (validating) list.
E	remove(int index)
E	set(int index, E object)
java.util.List<E>	subList(int fromIndex, int toIndex)

Methods inherited from class org.apache.commons.collections4.collection.PredicatedCollection

add, addAll, builder, notNullBuilder, predicatedCollection

Methods inherited from class org.apache.commons.collections4.collection.AbstractCollectionDecorator

clear, contains, containsAll, isEmpty, iterator, remove, removeAll, removeIf, retainAll, size, toArray, toArray, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.List

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, replaceAll, retainAll, size, sort, spliterator, toArray, toArray

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Method Detail

predicatedList

public static <T> PredicatedList<T> predicatedList(java.util.List<T> list,
                                                   Predicate<? super T> predicate)

Factory method to create a predicated (validating) list.

If there are any elements already in the list being decorated, they are validated.

Type Parameters:

T - the type of the elements in the list

Parameters:

list - the list to decorate, must not be null

predicate - the predicate to use for validation, must not be null

Returns:

a new predicated list

Throws:

java.lang.NullPointerException - if list or predicate is null

java.lang.IllegalArgumentException - if the list contains invalid elements

Since:

4.0

equals

public boolean equals(java.lang.Object object)

Specified by:

equals in interface java.util.Collection<E>

Specified by:

equals in interface java.util.List<E>

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Collection<E>

Specified by:

hashCode in interface java.util.List<E>

Overrides:

hashCode in class java.lang.Object

get

public E get(int index)

Specified by:

get in interface java.util.List<E>

indexOf

public int indexOf(java.lang.Object object)

Specified by:

indexOf in interface java.util.List<E>

lastIndexOf

public int lastIndexOf(java.lang.Object object)

Specified by:

lastIndexOf in interface java.util.List<E>

remove

public E remove(int index)

Specified by:

remove in interface java.util.List<E>

add

public void add(int index,
                E object)

Specified by:

add in interface java.util.List<E>

addAll

public boolean addAll(int index,
                      java.util.Collection<? extends E> coll)

Specified by:

addAll in interface java.util.List<E>

listIterator

public java.util.ListIterator<E> listIterator()

Specified by:

listIterator in interface java.util.List<E>

listIterator

public java.util.ListIterator<E> listIterator(int i)

Specified by:

listIterator in interface java.util.List<E>

set

public E set(int index,
             E object)

Specified by:

set in interface java.util.List<E>

subList

public java.util.List<E> subList(int fromIndex,
                                 int toIndex)

Specified by:

subList in interface java.util.List<E>