Package org.apache.lucene.util

# Class BytesRefBlockPool

java.lang.Object
org.apache.lucene.util.BytesRefBlockPool

All Implemented Interfaces:
  `Accountable`

public class BytesRefBlockPool extends Object implements Accountable
Represents a logical list of ByteRef backed by a `ByteBlockPool`. It uses up to two bytes to record the length of the BytesRef followed by the actual bytes. They can be read using the start position returned when they are appended.

The `BytesRef` is written so it never crosses the `ByteBlockPool.BYTE_BLOCK_SIZE` boundary. The limit of the largest `BytesRef` is therefore `ByteBlockPool.BYTE_BLOCK_SIZE`-2 bytes.

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

## Field Summary

### Fields inherited from interface org.apache.lucene.util.Accountable

`NULL_ACCOUNTABLE`

## Constructor Summary

Constructors
Constructor
Description
`BytesRefBlockPool()`
`BytesRefBlockPool(ByteBlockPool byteBlockPool)`

## Method Summary

Modifier and Type
Method
Description
`int`
`addBytesRef(BytesRef bytes)`
Add a term returning the start position on the underlying `ByteBlockPool`.
`void`
`fillBytesRef(BytesRef term, int start)`
Populates the given BytesRef with the term starting at start.
`long`
`ramBytesUsed()`
Return the memory usage of this object in bytes.

### Methods inherited from class java.lang.Object

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

### Methods inherited from interface org.apache.lucene.util.Accountable

`getChildResources`

## Constructor Details

### BytesRefBlockPool

public BytesRefBlockPool()

### BytesRefBlockPool

public BytesRefBlockPool(ByteBlockPool byteBlockPool)

## Method Details

### fillBytesRef

public void fillBytesRef(BytesRef term, int start)
Populates the given BytesRef with the term starting at start.

See Also:
  - `fillBytesRef(BytesRef, int)`

### addBytesRef

public int addBytesRef(BytesRef bytes)
Add a term returning the start position on the underlying `ByteBlockPool`. THis can be used to read back the value using `fillBytesRef(BytesRef, int)`.

See Also:
  - `fillBytesRef(BytesRef, int)`

### ramBytesUsed

public long ramBytesUsed()
Description copied from interface: `Accountable`
Return the memory usage of this object in bytes. Negative values are illegal.

Specified by:
  `ramBytesUsed` in interface `Accountable`