Package org.apache.lucene.index

# Class FilterDirectoryReader.SubReaderWrapper

java.lang.Object
org.apache.lucene.index.FilterDirectoryReader.SubReaderWrapper

Direct Known Subclasses:
  `ExitableDirectoryReader.ExitableSubReaderWrapper`

Enclosing class:
  `FilterDirectoryReader`

public abstract static class FilterDirectoryReader.SubReaderWrapper extends Object
Factory class passed to FilterDirectoryReader constructor that allows subclasses to wrap the filtered DirectoryReader's subreaders. You can use this to, e.g., wrap the subreaders with specialised FilterLeafReader implementations.

## Constructor Summary

Constructors
Constructor
Description
`SubReaderWrapper()`
Constructor

## Method Summary

Modifier and Type
Method
Description
`protected LeafReader[]`
`wrap(List<? extends LeafReader> readers)`
Wraps a list of LeafReaders
`abstract LeafReader`
`wrap(LeafReader reader)`
Wrap one of the parent DirectoryReader's subreaders

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

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

## Constructor Details

### SubReaderWrapper

public SubReaderWrapper()
Constructor

## Method Details

### wrap

protected LeafReader[] wrap(List<? extends LeafReader> readers)
Wraps a list of LeafReaders

Returns:
  an array of wrapped LeafReaders. The returned array might contain less elements compared to the given reader list if an entire reader is filtered out.

### wrap

public abstract LeafReader wrap(LeafReader reader)
Wrap one of the parent DirectoryReader's subreaders

Parameters:
  `reader` - the subreader to wrap
Returns:
  a wrapped/filtered LeafReader