org.apache.lucene.codecs.intblock

Class VariableIntBlockIndexOutput

java.lang.Object

org.apache.lucene.codecs.sep.IntIndexOutput

org.apache.lucene.codecs.intblock.VariableIntBlockIndexOutput

All Implemented Interfaces:

Closeable

public abstract class VariableIntBlockIndexOutput
extends IntIndexOutput

Abstract base class that writes variable-size blocks of ints to an IndexOutput. While this is a simple approach, a more performant approach would directly create an impl of IntIndexOutput inside Directory. Wrapping a generic IndexInput will likely cost performance.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field and Description
protected IndexOutput	out

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	VariableIntBlockIndexOutput(IndexOutput out, int maxBlockSize) NOTE: maxBlockSize must be the maximum block size plus the max non-causal lookahead of your codec.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract int	add(int value) Called one value at a time.
void	close()
IntIndexOutput.Index	index() If you are indexing the primary output file, call this and interact with the returned IndexWriter.
void	write(int v) Write an int to the primary file.

Methods inherited from class java.lang.Object

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

Field Detail

out

protected final IndexOutput out

Constructor Detail

VariableIntBlockIndexOutput

protected VariableIntBlockIndexOutput(IndexOutput out,
                           int maxBlockSize)
                               throws IOException

NOTE: maxBlockSize must be the maximum block size plus the max non-causal lookahead of your codec. EG Simple9 requires lookahead=1 because on seeing the Nth value it knows it must now encode the N-1 values before it.

Throws:

IOException

Method Detail

add

protected abstract int add(int value)
                    throws IOException

Called one value at a time. Return the number of buffered input values that have been written to out.

Throws:

IOException

index

public IntIndexOutput.Index index()
                           throws IOException

Description copied from class: IntIndexOutput

If you are indexing the primary output file, call this and interact with the returned IndexWriter.

Specified by:

index in class IntIndexOutput

Throws:

IOException

write

public void write(int v)
           throws IOException

Description copied from class: IntIndexOutput

Write an int to the primary file. The value must be >= 0.

Specified by:

write in class IntIndexOutput

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class IntIndexOutput

Throws:

IOException