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
`static interface` `RollingBuffer.Resettable` Implement to reset an instance

### Constructor Summary

Constructors
Constructor and Description
`RollingBuffer()`

### Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
`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)