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java.lang.Object | +--java.util.AbstractCollection | +--org.apache.commons.collections.BoundedFifoBuffer
The BoundedFifoBuffer is a very efficient implementation of Buffer that does not alter the size of the buffer at runtime.
The removal order of a BoundedFifoBuffer
is based on the
insertion order; elements are removed in the same order in which they
were added. The iteration order is the same as the removal order.
The add(Object)
, remove()
and get()
operations
all perform in constant time. All other operations perform in linear
time or worse.
Note that this implementation is not synchronized. The following can be
used to provide synchronized access to your BoundedFifoBuffer
:
Buffer fifo = BufferUtils.synchronizedBuffer(new BoundedFifoBuffer());
This buffer prevents null objects from being added.
Constructor Summary | |
BoundedFifoBuffer()
Constructs a new BoundedFifoBuffer big enough to hold
32 elements. |
|
BoundedFifoBuffer(Collection coll)
Constructs a new BoundedFifoBuffer big enough to hold all
of the elements in the specified collection. |
|
BoundedFifoBuffer(int size)
Constructs a new BoundedFifoBuffer big enough to hold
the specified number of elements. |
Method Summary | |
boolean |
add(Object element)
Adds the given element to this buffer. |
void |
clear()
Clears this buffer. |
Object |
get()
Returns the least recently inserted element in this buffer. |
boolean |
isEmpty()
Returns true if this buffer is empty; false otherwise. |
Iterator |
iterator()
Returns an iterator over this buffer's elements. |
Object |
remove()
Removes the least recently inserted element from this buffer. |
int |
size()
Returns the number of elements stored in the buffer. |
Methods inherited from class java.util.AbstractCollection |
addAll,
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 |
Constructor Detail |
public BoundedFifoBuffer()
BoundedFifoBuffer
big enough to hold
32 elements.public BoundedFifoBuffer(int size)
BoundedFifoBuffer
big enough to hold
the specified number of elements.size
- the maximum number of elements for this fifopublic BoundedFifoBuffer(Collection coll)
BoundedFifoBuffer
big enough to hold all
of the elements in the specified collection. That collection's
elements will also be added to the buffer.coll
- the collection whose elements to addMethod Detail |
public int size()
public boolean isEmpty()
public void clear()
public boolean add(Object element)
element
- the element to addpublic Object get()
public Object remove()
public Iterator iterator()
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