org.springframework.util

Class AutoPopulatingList<E>

  • java.lang.Object
    • org.springframework.util.AutoPopulatingList<E>
  • Type Parameters:
    E - the element type
    All Implemented Interfaces:
    java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, java.util.List<E>


    public class AutoPopulatingList<E>
    extends java.lang.Object
    implements java.util.List<E>, java.io.Serializable
    Simple List wrapper class that allows for elements to be automatically populated as they are requested. This is particularly useful for data binding to Lists, allowing for elements to be created and added to the List in a "just in time" fashion.

    Note: This class is not thread-safe. To create a thread-safe version, use the Collections.synchronizedList(java.util.List<T>) utility methods.

    Inspired by LazyList from Commons Collections.

    Since:
    2.0
    Author:
    Rob Harrop, Juergen Hoeller
    See Also:
    Serialized Form
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      boolean add(E o) 
      void add(int index, E element) 
      boolean addAll(java.util.Collection<? extends E> c) 
      boolean addAll(int index, java.util.Collection<? extends E> c) 
      void clear() 
      boolean contains(java.lang.Object o) 
      boolean containsAll(java.util.Collection<?> c) 
      boolean equals(java.lang.Object other) 
      E get(int index)
      Get the element at the supplied index, creating it if there is no element at that index.
      int hashCode() 
      int indexOf(java.lang.Object o) 
      boolean isEmpty() 
      java.util.Iterator<E> iterator() 
      int lastIndexOf(java.lang.Object o) 
      java.util.ListIterator<E> listIterator() 
      java.util.ListIterator<E> listIterator(int index) 
      E remove(int index) 
      boolean remove(java.lang.Object o) 
      boolean removeAll(java.util.Collection<?> c) 
      boolean retainAll(java.util.Collection<?> c) 
      E set(int index, E element) 
      int size() 
      java.util.List<E> subList(int fromIndex, int toIndex) 
      java.lang.Object[] toArray() 
      <T> T[] toArray(T[] a) 
      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
      • Methods inherited from interface java.util.List

        replaceAll, sort, spliterator
      • Methods inherited from interface java.util.Collection

        parallelStream, removeIf, stream
      • Methods inherited from interface java.lang.Iterable

        forEach
    • Constructor Detail

      • AutoPopulatingList

        public AutoPopulatingList(java.lang.Class<? extends E> elementClass)
        Creates a new AutoPopulatingList that is backed by a standard ArrayList and adds new instances of the supplied element Class to the backing List on demand.
      • AutoPopulatingList

        public AutoPopulatingList(java.util.List<E> backingList,
                                  java.lang.Class<? extends E> elementClass)
        Creates a new AutoPopulatingList that is backed by the supplied List and adds new instances of the supplied element Class to the backing List on demand.
    • Method Detail

      • add

        public void add(int index,
                        E element)
        Specified by:
        add in interface java.util.List<E>
      • add

        public boolean add(E o)
        Specified by:
        add in interface java.util.Collection<E>
        Specified by:
        add in interface java.util.List<E>
      • addAll

        public boolean addAll(java.util.Collection<? extends E> c)
        Specified by:
        addAll in interface java.util.Collection<E>
        Specified by:
        addAll in interface java.util.List<E>
      • addAll

        public boolean addAll(int index,
                              java.util.Collection<? extends E> c)
        Specified by:
        addAll in interface java.util.List<E>
      • clear

        public void clear()
        Specified by:
        clear in interface java.util.Collection<E>
        Specified by:
        clear in interface java.util.List<E>
      • contains

        public boolean contains(java.lang.Object o)
        Specified by:
        contains in interface java.util.Collection<E>
        Specified by:
        contains in interface java.util.List<E>
      • containsAll

        public boolean containsAll(java.util.Collection<?> c)
        Specified by:
        containsAll in interface java.util.Collection<E>
        Specified by:
        containsAll in interface java.util.List<E>
      • get

        public E get(int index)
        Get the element at the supplied index, creating it if there is no element at that index.
        Specified by:
        get in interface java.util.List<E>
      • indexOf

        public int indexOf(java.lang.Object o)
        Specified by:
        indexOf in interface java.util.List<E>
      • isEmpty

        public boolean isEmpty()
        Specified by:
        isEmpty in interface java.util.Collection<E>
        Specified by:
        isEmpty in interface java.util.List<E>
      • iterator

        public java.util.Iterator<E> iterator()
        Specified by:
        iterator in interface java.lang.Iterable<E>
        Specified by:
        iterator in interface java.util.Collection<E>
        Specified by:
        iterator in interface java.util.List<E>
      • lastIndexOf

        public int lastIndexOf(java.lang.Object o)
        Specified by:
        lastIndexOf 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 index)
        Specified by:
        listIterator in interface java.util.List<E>
      • remove

        public E remove(int index)
        Specified by:
        remove in interface java.util.List<E>
      • remove

        public boolean remove(java.lang.Object o)
        Specified by:
        remove in interface java.util.Collection<E>
        Specified by:
        remove in interface java.util.List<E>
      • removeAll

        public boolean removeAll(java.util.Collection<?> c)
        Specified by:
        removeAll in interface java.util.Collection<E>
        Specified by:
        removeAll in interface java.util.List<E>
      • retainAll

        public boolean retainAll(java.util.Collection<?> c)
        Specified by:
        retainAll in interface java.util.Collection<E>
        Specified by:
        retainAll in interface java.util.List<E>
      • set

        public E set(int index,
                     E element)
        Specified by:
        set in interface java.util.List<E>
      • size

        public int size()
        Specified by:
        size in interface java.util.Collection<E>
        Specified by:
        size 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>
      • toArray

        public java.lang.Object[] toArray()
        Specified by:
        toArray in interface java.util.Collection<E>
        Specified by:
        toArray in interface java.util.List<E>
      • toArray

        public <T> T[] toArray(T[] a)
        Specified by:
        toArray in interface java.util.Collection<E>
        Specified by:
        toArray in interface java.util.List<E>
      • equals

        public boolean equals(java.lang.Object other)
        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