com.jidesoft.utils

Class CachedArrayList<E>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

java.util.ArrayList<E>

com.jidesoft.utils.CachedArrayList<E>

All Implemented Interfaces:

Serializable, Cloneable, Iterable<E>, Collection<E>, List<E>, RandomAccess

public class CachedArrayList<E>
extends ArrayList<E>

This is a fast access ArrayList that sacrifices memory for speed. It will reduce the speed of indexOf method from O(n) to O(1). However it will at least double the memory used by ArrayList. So use it appropriately.

Just like ArrayList, this implementation is not synchronized. If you want a thread safe implementation, you can use CachedArrayList.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CachedArrayList.IntegerWrapper

Field Summary

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor and Description
CachedArrayList()
CachedArrayList(Collection<? extends E> c)
CachedArrayList(int initialCapacity)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(E element)
void	add(int index, E element)
boolean	addAll(Collection<? extends E> c)
boolean	addAll(int index, Collection<? extends E> c)
protected void	adjustCache(int index, int increase) Adjusts the cache so that all values that are greater than index will increase by the value specified by the increase parameter.
void	cacheAll() Cache all the element index.
void	cacheIt(Object o, int index) Caches the index of the element.
void	clear()
protected Map<Object,CachedArrayList.IntegerWrapper>	createCache()
int	indexOf(Object elem)
void	invalidateCache() Invalidated the whole cache.
boolean	isLazyCaching()
E	remove(int index)
boolean	remove(Object o)
boolean	removeAll(Collection<?> c)
protected void	removeRange(int fromIndex, int toIndex)
E	set(int index, E element)
void	setLazyCaching(boolean lazyCaching)
void	uncacheAll() Uncache the whole cache.
void	uncacheIt(Object o) Uncaches the index of the element.

Methods inherited from class java.util.ArrayList

clone, contains, ensureCapacity, get, isEmpty, iterator, lastIndexOf, listIterator, listIterator, retainAll, size, subList, toArray, toArray, trimToSize

Methods inherited from class java.util.AbstractList

equals, hashCode

Methods inherited from class java.util.AbstractCollection

containsAll, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.List

containsAll, equals, hashCode

Constructor Detail

CachedArrayList

public CachedArrayList()

CachedArrayList

public CachedArrayList(Collection<? extends E> c)

CachedArrayList

public CachedArrayList(int initialCapacity)

Method Detail

indexOf

public int indexOf(Object elem)

Specified by:

indexOf in interface List<E>

Overrides:

indexOf in class ArrayList<E>

adjustCache

protected void adjustCache(int index,
               int increase)

Adjusts the cache so that all values that are greater than index will increase by the value specified by the increase parameter.

Parameters:

index - the index. All values above this index will be changed.

increase - a positive number to increase or a negative number to decrease.

createCache

protected Map<Object,CachedArrayList.IntegerWrapper> createCache()

cacheIt

public void cacheIt(Object o,
           int index)

Caches the index of the element.

Parameters:

o - the element

index - the index.

uncacheIt

public void uncacheIt(Object o)

Uncaches the index of the element.

Parameters:

o - the element

add

public boolean add(E element)

Specified by:

add in interface Collection<E>

Specified by:

add in interface List<E>

Overrides:

add in class ArrayList<E>

add

public void add(int index,
       E element)

Specified by:

add in interface List<E>

Overrides:

add in class ArrayList<E>

remove

public E remove(int index)

Specified by:

remove in interface List<E>

Overrides:

remove in class ArrayList<E>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<E>

Specified by:

remove in interface List<E>

Overrides:

remove in class ArrayList<E>

removeAll

public boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<E>

Specified by:

removeAll in interface List<E>

Overrides:

removeAll in class ArrayList<E>

clear

public void clear()

Specified by:

clear in interface Collection<E>

Specified by:

clear in interface List<E>

Overrides:

clear in class ArrayList<E>

addAll

public boolean addAll(Collection<? extends E> c)

Specified by:

addAll in interface Collection<E>

Specified by:

addAll in interface List<E>

Overrides:

addAll in class ArrayList<E>

addAll

public boolean addAll(int index,
             Collection<? extends E> c)

Specified by:

addAll in interface List<E>

Overrides:

addAll in class ArrayList<E>

set

public E set(int index,
    E element)

Specified by:

set in interface List<E>

Overrides:

set in class ArrayList<E>

invalidateCache

public void invalidateCache()

Invalidated the whole cache.

uncacheAll

public void uncacheAll()

Uncache the whole cache. It is the same as invalidateCache().

cacheAll

public void cacheAll()

Cache all the element index.

isLazyCaching

public boolean isLazyCaching()

setLazyCaching

public void setLazyCaching(boolean lazyCaching)

removeRange

protected void removeRange(int fromIndex,
               int toIndex)

Overrides:

removeRange in class ArrayList<E>