Package 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 Description
    CircularBuffer​(int bufferSize)  

  • Method Summary

    Modifier and Type Method 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, toArray

    Methods inherited from interface java.lang.Iterable

    forEach

  • Constructor Details

  • Method Details

    • 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.util.Collection<T>
      Specified by:
      iterator in interface java.lang.Iterable<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>