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Oracle® Fusion Middleware Java API Reference for Oracle Coherence 12c (12.1.3.0.0) E47890-01 |
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java.lang.Object
java.util.AbstractCollection
java.util.AbstractList
com.tangosol.util.CircularArrayList
public class CircularArrayList
Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. (This class is roughly equivalent to ArrayList, except that it is optimized for removing elements at the front and back of the list to facilitate use as a queue or deque.
The size, isEmpty, get, set, iterator, and listIterator operations run in constant time. The add operation runs in amortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for the LinkedList implementation.
Each CircularArrayList instance has a capacity. The capacity is the size of the array used to store the elements in the list. It is always at least as large as the list size. As elements are added to an CircularArrayList, its capacity grows automatically. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost.
An application can increase the capacity of an CircularArrayList instance before adding a large number of elements using the ensureCapacity operation. This may reduce the amount of incremental reallocation.
Note that this implementation is not synchronized. If multiple threads access a CircularArrayList concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the list. If no object exists, the list should be "wrapped" using the Collections.synchronizedList method. This is best done at creation time, to prevent accidental unsynchronized access to the list:
List list = Collections.synchronizedList(new CircularArrayList(...));
The iterators returned by this class's iterator and listIterator methods are fail-fast: if list is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove or add methods, the iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.
Field Summary | |
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protected java.lang.Object[] |
m_aoData The array into which the elements of the list are stored. |
protected int |
m_cElements The size of the list (the number of elements it contains). |
protected int |
m_iFirst The offset to the first element. |
protected int |
m_iLast The offset to one past the last element. |
Fields inherited from class java.util.AbstractList |
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modCount |
Constructor Summary | |
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CircularArrayList() Create a new CircularArrayList with default settings. |
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CircularArrayList(java.util.Collection c) Construct a CircularArrayList containing the elements of the specified collection in the order they are returned by the collection's iterator. |
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CircularArrayList(int cInitialElements) Create a new CircularArrayList with the specified initial capacity. |
Method Summary | |
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void |
add(int index, java.lang.Object o) Insert the element at the specified position in this list. |
boolean |
add(java.lang.Object o) |
boolean |
addAll(java.util.Collection c) Appends all of the elements in the specified Collection to the end of this list, in the order that they are returned by the specified Collection's Iterator. |
boolean |
addAll(int index, java.util.Collection c) Inserts all of the elements in the specified Collection into this list, starting at the specified position. |
void |
clear() |
java.lang.Object |
clone() Returns a shallow copy of this list instance. |
boolean |
contains(java.lang.Object o) |
void |
dump() Outputs information to standard output about representation for debugging purposes. |
protected int |
effectiveIndex(int index) Calculate the effective index taking into account offsets and the circular nature of CircularArrayList. |
boolean |
ensureCapacity(int cMin) Increase the capacity of this list instance, if necessary, to ensure that it can hold at least the specified number of elements. |
protected boolean |
ensureCompactness() Ensure the representation of this list is appropriatly compact by shrinking if necessary. |
protected int |
ensureEffectiveIndex(int index) After range checking Calculate the effective index while taking into account the offsets and the circular nature of the list. |
java.lang.Object |
get(int index) |
int |
indexOf(java.lang.Object o) Search for the first occurence of the given argument, testing for equality using the equals method. |
boolean |
isEmpty() |
int |
lastIndexOf(java.lang.Object o) Returns the index of the last occurrence of the specified object in this CycicArrayList. |
protected void |
rangeCheck(int index) Check if the given index is in range. |
java.lang.Object |
remove(int index) Removes the element at the specified position in this list. |
protected void |
removeRange(int fromIndex, int toIndex) Removes from this list all of the elements whose indexes are between fromIndex, inclusive and toIndex, exclusive. |
java.lang.Object |
set(int index, java.lang.Object o) |
int |
size() |
java.lang.Object[] |
toArray() |
java.lang.Object[] |
toArray(java.lang.Object[] ao) |
void |
trimToSize() Trim the capacity of this list instance to be as small as possible. |
Methods inherited from class java.util.AbstractList |
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equals, hashCode, iterator, listIterator, listIterator, subList |
Methods inherited from class java.util.AbstractCollection |
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containsAll, remove, removeAll, retainAll, toString |
Methods inherited from interface java.util.List |
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containsAll, equals, hashCode, iterator, listIterator, listIterator, remove, removeAll, retainAll, subList |
Field Detail |
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protected java.lang.Object[] m_aoData
protected int m_iFirst
protected int m_iLast
protected int m_cElements
Constructor Detail |
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public CircularArrayList()
public CircularArrayList(int cInitialElements)
cInitialElements
- the initial capacity of the listjava.lang.IllegalArgumentException
- if the specified initial capacity is negativepublic CircularArrayList(java.util.Collection c)
c
- the collection whose elements are to be placed into this listMethod Detail |
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public void trimToSize()
public boolean ensureCapacity(int cMin)
cMin
- the minimum allowable capacitypublic int size()
size
in interface java.util.Collection
size
in interface java.util.List
size
in class java.util.AbstractCollection
public boolean isEmpty()
isEmpty
in interface java.util.Collection
isEmpty
in interface java.util.List
isEmpty
in class java.util.AbstractCollection
public boolean contains(java.lang.Object o)
contains
in interface java.util.Collection
contains
in interface java.util.List
contains
in class java.util.AbstractCollection
public int indexOf(java.lang.Object o)
indexOf
in interface java.util.List
indexOf
in class java.util.AbstractList
o
- the element to search forpublic int lastIndexOf(java.lang.Object o)
lastIndexOf
in interface java.util.List
lastIndexOf
in class java.util.AbstractList
o
- the element to search forpublic java.lang.Object[] toArray()
toArray
in interface java.util.Collection
toArray
in interface java.util.List
toArray
in class java.util.AbstractCollection
public java.lang.Object[] toArray(java.lang.Object[] ao)
toArray
in interface java.util.Collection
toArray
in interface java.util.List
toArray
in class java.util.AbstractCollection
public java.lang.Object get(int index)
get
in interface java.util.List
get
in class java.util.AbstractList
public java.lang.Object set(int index, java.lang.Object o)
set
in interface java.util.List
set
in class java.util.AbstractList
public boolean add(java.lang.Object o)
add
in interface java.util.Collection
add
in interface java.util.List
add
in class java.util.AbstractList
public void add(int index, java.lang.Object o)
add
in interface java.util.List
add
in class java.util.AbstractList
index
- the index at which the specified element will be insertedo
- the element to be insertedjava.lang.IndexOutOfBoundsException
- if index is out of rangepublic java.lang.Object remove(int index)
remove
in interface java.util.List
remove
in class java.util.AbstractList
index
- the index of the element to removedjava.lang.IndexOutOfBoundsException
- if index out of rangepublic void clear()
clear
in interface java.util.Collection
clear
in interface java.util.List
clear
in class java.util.AbstractList
public boolean addAll(java.util.Collection c)
addAll
in interface java.util.Collection
addAll
in interface java.util.List
addAll
in class java.util.AbstractCollection
c
- the elements to be inserted into this listjava.lang.NullPointerException
- if the specified collection is null.public boolean addAll(int index, java.util.Collection c)
addAll
in interface java.util.List
addAll
in class java.util.AbstractList
index
- the index at which to insert first element from the specified collectionc
- the elements to be inserted into this listjava.lang.IndexOutOfBoundsException
- if index out of rangejava.lang.NullPointerException
- if the specified Collection is nullprotected void removeRange(int fromIndex, int toIndex)
removeRange
in class java.util.AbstractList
fromIndex
- the index of first element to be removedtoIndex
- the index after last element to be removed.public java.lang.Object clone()
protected int effectiveIndex(int index)
index
- the index to transformprotected void rangeCheck(int index)
index
- the index to be checked for being between size() and 0 inclusivejava.lang.IndexOutOfBoundsException
protected int ensureEffectiveIndex(int index)
index
- the index to transformjava.lang.IndexOutOfBoundsException
protected boolean ensureCompactness()
public void dump()
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Oracle® Fusion Middleware Java API Reference for Oracle Coherence 12c (12.1.3.0.0) E47890-01 |
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