org.apache.lucene.util

Class RollingBuffer<T extends RollingBuffer.Resettable>

java.lang.Object

org.apache.lucene.util.RollingBuffer<T>

public abstract class RollingBuffer<T extends RollingBuffer.Resettable>
extends Object

Acts like forever growing T[], but internally uses a circular buffer to reuse instances of T.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RollingBuffer.Resettable Implement to reset an instance

Constructor Summary

Constructors

Constructor and Description
RollingBuffer()

Method Summary

Modifier and Type	Method and Description
void	freeBefore(int pos)
T	get(int pos) Get T instance for this absolute position; this is allowed to be arbitrarily far "in the future" but cannot be before the last freeBefore.
int	getBufferSize() Returns how many active positions are in the buffer.
int	getMaxPos() Returns the maximum position looked up, or -1 if no position has been looked up since reset/init.
protected abstract T	newInstance()
void	reset()

Methods inherited from class java.lang.Object

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

Constructor Detail

RollingBuffer

public RollingBuffer()

Method Detail

newInstance

protected abstract T newInstance()

reset

public void reset()

get

public T get(int pos)

Get T instance for this absolute position; this is allowed to be arbitrarily far "in the future" but cannot be before the last freeBefore.

getMaxPos

public int getMaxPos()

Returns the maximum position looked up, or -1 if no position has been looked up since reset/init.

getBufferSize

public int getBufferSize()

Returns how many active positions are in the buffer.

freeBefore

public void freeBefore(int pos)