org.eclipse.nebula.visualization.xygraph.dataprovider

Class CircularBuffer<T>

java.lang.Object

java.util.AbstractCollection<T>

org.eclipse.nebula.visualization.xygraph.dataprovider.CircularBuffer<T>

All Implemented Interfaces:

java.lang.Iterable<T>, java.util.Collection<T>

public class CircularBuffer<T>
extends java.util.AbstractCollection<T>

A particular circular buffer. New arrived data will be appended to the tail of the buffer. When buffer is full, the oldest data will be deleted when new data arrived.

Constructor Summary

Constructors

Constructor and Description
CircularBuffer(int bufferSize)

Method Summary

Modifier and Type	Method and Description
boolean	add(T element) Add an element.
void	clear() clear the buffer;
int	getBufferSize()
T	getElement(int index) Get element
T	getHead() Get head element
T	getTail() Get tail element
java.util.Iterator<T>	iterator()
void	setBufferSize(int bufferSize, boolean clear) Set the buffer size.
int	size()

Methods inherited from class java.util.AbstractCollection

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

equals, hashCode, parallelStream, removeIf, spliterator, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

CircularBuffer

public CircularBuffer(int bufferSize)

Method Detail

add

public boolean add(T element)

Add an element.

Specified by:

add in interface java.util.Collection<T>

Overrides:

add in class java.util.AbstractCollection<T>

Parameters:

element -

getElement

public T getElement(int index)

Get element

Parameters:

index - the index of the element in the buffer.

Returns:

the element. null if the data at the index doesn't exist.

getHead

public T getHead()

Get head element

Returns:

the head element. null if the buffer is empty.

getTail

public T getTail()

Get tail element

Returns:

the tail element. null if the buffer is empty.

clear

public void clear()

clear the buffer;

Specified by:

clear in interface java.util.Collection<T>

Overrides:

clear in class java.util.AbstractCollection<T>

setBufferSize

public void setBufferSize(int bufferSize,
                          boolean clear)

Set the buffer size.

Parameters:

bufferSize - the bufferSize to set

clear - clear the buffer if true. Otherwise keep the exist data; Oldest data will be omitted if the new bufferSize is less than the exist data count.

getBufferSize

public int getBufferSize()

Returns:

the bufferSize

iterator

public java.util.Iterator<T> iterator()

Specified by:

iterator in interface java.lang.Iterable<T>

Specified by:

iterator in interface java.util.Collection<T>

Specified by:

iterator in class java.util.AbstractCollection<T>

size

public int size()

Specified by:

size in interface java.util.Collection<T>

Specified by:

size in class java.util.AbstractCollection<T>