Package org.basex.index.value

Class DiskValuesBuilder

java.lang.Object

org.basex.core.jobs.Job

org.basex.index.IndexBuilder

org.basex.index.ValuesBuilder

org.basex.index.value.DiskValuesBuilder

public final class DiskValuesBuilder
extends ValuesBuilder

This class builds an index for attribute values and text contents in a tree structure and stores the result to disk.

The data is stored on disk in the following format:

• DATATXT/ATV + 'l': contains the index values, which are dense id lists to all text nodes/attribute values, stored in the Num format: [size0, id1, id2, ...]. The number of index keys is stored in the first 4 bytes of the file.
• DATATXT/ATV + 'r': contains 5-byte references to the id lists for all keys. To save space, the keys itself are not stored in the index structure. Instead, they can be found by following the id references to the main table.

Author:

BaseX Team 2005-21, BSD License, Christian Gruen

Field Summary

Fields inherited from class org.basex.index.ValuesBuilder

tokenize

Fields inherited from class org.basex.index.IndexBuilder

count, data, pre, size, splits, text, type

Fields inherited from class org.basex.core.jobs.Job

state, updating

Constructor Summary

Constructors

Constructor	Description
DiskValuesBuilder(Data data, IndexType type)	Constructor.

Method Summary

Modifier and Type	Method	Description
DiskValues	build()	Builds the index structure and returns an index instance.
protected void	check()	Checks if the command was interrupted, and prints some debug output.

Methods inherited from class org.basex.index.IndexBuilder

clean, detailedInfo, finishIndex, indexEntry, progressInfo, shortInfo, splitRequired

Methods inherited from class org.basex.core.jobs.Job

active, addLocks, checkStop, jc, memory, popJob, pushJob, register, state, stop, stopped, timeout, unregister

Methods inherited from class java.lang.Object

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

Constructor Details

DiskValuesBuilder

public DiskValuesBuilder(Data data,
 IndexType type)

Constructor.

Parameters:

data - data reference

type - index type

Method Details

build

public DiskValues build()
                 throws IOException

Description copied from class: IndexBuilder

Builds the index structure and returns an index instance.

Specified by:

build in class IndexBuilder

Returns:

index instance

Throws:

IOException - I/O Exception

check

protected void check()
              throws IOException

Description copied from class: IndexBuilder

Checks if the command was interrupted, and prints some debug output.

Overrides:

check in class IndexBuilder

Throws:

IOException - I/O Exception