# All Classes and Interfaces

Class
Description
AlcoholicMergePolicy
Merge policy for testing, it is like an alcoholic.
AllDeletedFilterReader
Filters the incoming reader and makes all documents appear deleted.
AssertingCodec
Acts like the default codec but with additional asserts.
AssertingCollector
A collector that asserts that it is used correctly.
AssertingDirectoryReader
A `DirectoryReader` that wraps all its subreaders with `AssertingLeafReader`
AssertingDocValuesFormat
Just like the default but with additional asserts.
AssertingIndexSearcher
Helper class that adds some extra checks to ensure correct usage of `IndexSearcher` and `Weight`.
AssertingKnnVectorsFormat
Wraps the default KnnVectorsFormat and provides additional assertions.
AssertingLeafReader
A `FilterLeafReader` that can be used to apply additional checks for tests.
AssertingLeafReader.AssertingBinaryDocValues
Wraps a BinaryDocValues but with additional asserts
AssertingLeafReader.AssertingBits
Wraps a Bits but with additional asserts
AssertingLeafReader.AssertingDocValuesSkipper
Wraps a DocValuesSkipper but with additional asserts
AssertingLeafReader.AssertingFields
Wraps a Fields but with additional asserts
AssertingLeafReader.AssertingImpactsEnum
Wraps a `ImpactsEnum` with additional checks
AssertingLeafReader.AssertingNumericDocValues
Wraps a NumericDocValues but with additional asserts
AssertingLeafReader.AssertingPointValues
Wraps a SortedSetDocValues but with additional asserts
AssertingLeafReader.AssertingPostingsEnum
Wraps a docsenum with additional checks
AssertingLeafReader.AssertingSortedDocValues
Wraps a SortedDocValues but with additional asserts
AssertingLeafReader.AssertingSortedNumericDocValues
Wraps a SortedNumericDocValues but with additional asserts
AssertingLeafReader.AssertingSortedSetDocValues
Wraps a SortedSetDocValues but with additional asserts
AssertingLeafReader.AssertingStoredFields
Wraps a StoredFields but with additional asserts
AssertingLeafReader.AssertingTerms
Wraps a Terms but with additional asserts
AssertingLeafReader.AssertingTermVectors
Wraps a TermVectors but with additional asserts
AssertingLiveDocsFormat
Just like the default live docs format but with additional asserts.
AssertingMatches
An implementation of `Matches` with additional consistency checks.
AssertingNormsFormat
Just like the default but with additional asserts.
AssertingPointsFormat
Just like the default point format but with additional asserts.
AssertingPostingsFormat
Just like the default postings format but with additional asserts.
AssertingQuery
Assertion-enabled query.
AssertingScorable
Wraps another Scorable and asserts that scores are reasonable and only called when positioned
AssertingScorer
Wraps a Scorer with additional checks
AssertingSimilarity
wraps a similarity with checks for testing
AssertingStoredFieldsFormat
Just like the default stored fields format but with additional asserts.
AssertingTermVectorsFormat
Just like the default vectors format but with additional asserts.
AutomatonTestUtil
Utilities for testing automata.
AutomatonTestUtil.RandomAcceptedStrings
Lets you retrieve random strings accepted by an Automaton.
BaseBitSetTestCase<T>
Base test case for BitSets.
BaseChunkedDirectoryTestCase
Base class for Directories that "chunk" the input into blocks.
BaseCompoundFormatTestCase
Abstract class to do basic tests for a compound format.
BaseCompressingDocValuesFormatTestCase
Extends `BaseDocValuesFormatTestCase` to add compression checks.
BaseDirectoryTestCase
Base class for `Directory` implementations.
BaseDirectoryWrapper
Calls check index on close.
BaseDocIdSetTestCase<T>
Base test class for `DocIdSet`s.
BaseDocValuesFormatTestCase
Extends `LegacyBaseDocValuesFormatTestCase` and adds checks for `DocValuesSkipper`.
BaseExplanationTestCase
Tests primitive queries (ie: that rewrite to themselves) to insure they match the expected set of docs, and that the score of each match is equal to the value of the scores explanation.
BaseFieldInfoFormatTestCase
Abstract class to do basic tests for fis format.
BaseGeoPointTestCase
Abstract class to do basic tests for a geospatial impl (high level fields and queries) NOTE: This test focuses on geospatial (distance queries, polygon queries, etc) indexing and search, not any underlying storage format or encoding: it merely supplies two hooks for the encoding so that tests can be exact.
BaseIndexFileFormatTestCase
Common tests to all index formats.
BaseIndexFileFormatTestCase.FileTrackingDirectoryWrapper
A directory that tracks created files that haven't been deleted.
BaseIndexFileFormatTestCase.ReadBytesDirectoryWrapper
A directory that tracks read bytes.
BaseKnnVectorsFormatTestCase
Base class aiming at testing `vectors formats`.
BaseLiveDocsFormatTestCase
Abstract class that performs basic testing of a codec's `LiveDocsFormat`.
BaseLockFactoryTestCase
Base class for per-LockFactory tests.
BaseMergePolicyTestCase
Base test case for `MergePolicy`.
BaseMergePolicyTestCase.IOStats
Statistics about bytes written to storage.
BaseMergePolicyTestCase.MockMergeContext
Simple mock merge context for tests
BaseNormsFormatTestCase
Abstract class to do basic tests for a norms format.
BasePointsFormatTestCase
Abstract class to do basic tests for a points format.
BasePostingsFormatTestCase
Abstract class to do basic tests for a postings format.
BaseRangeFieldQueryTestCase
Abstract class to do basic tests for a RangeField query.
BaseRangeFieldQueryTestCase.Range
base class for range verification
BaseRangeFieldQueryTestCase.Range.QueryType
supported query relations
BaseSegmentInfoFormatTestCase
Abstract class to do basic tests for si format.
BaseSimilarityTestCase
Abstract class to do basic tests for a similarity.
BaseStoredFieldsFormatTestCase
Base class aiming at testing `stored fields formats`.
BaseTermVectorsFormatTestCase
Base class aiming at testing `term vectors formats`.
BaseTermVectorsFormatTestCase.Options
A combination of term vectors options.
BaseTermVectorsFormatTestCase.RandomTokenStream
Produces a random TokenStream based off of provided terms.
BaseTestCheckIndex
Base class for CheckIndex tests.
BaseTokenStreamFactoryTestCase
Base class for testing tokenstream factories.
BaseTokenStreamTestCase
Base class for all Lucene unit tests that use TokenStreams.
BaseTokenStreamTestCase.CheckClearAttributesAttribute
Attribute that records if it was cleared or not.
BaseTokenStreamTestCase.CheckClearAttributesAttributeImpl
Attribute that records if it was cleared or not.
BaseXYPointTestCase
Abstract class to do basic tests for a xy spatial impl (high level fields and queries)
BlockScoreQueryWrapper
Query wrapper that reduces the size of max-score blocks to more easily detect problems with the max-score logic.
BulkScorerWrapperScorer
A `BulkScorer`-backed scorer.
CannedBinaryTokenStream
TokenStream from a canned list of binary (BytesRef-based) tokens.
CannedBinaryTokenStream.BinaryToken
Represents a binary token.
CannedTokenStream
TokenStream from a canned list of Tokens.
CheapBastardCodec
Codec that tries to use as little ram as possible because he spent all his money on beer
CheckHits
Utility class for asserting expected hits in tests.
CheckHits.ExplanationAsserter
Asserts that the score explanation for every document matching a query corresponds with the true score.
CheckHits.ExplanationAssertingSearcher
an IndexSearcher that implicitly checks hte explanation of every match whenever it executes a search.
CheckHits.MatchesAsserter
Asserts that the `Matches` from a query is non-null whenever the document its created for is a hit.
CheckHits.SetCollector
Just collects document ids into a set.
CollationTestBase
Base test class for testing Unicode collation.
CompressingCodec
A codec that uses `Lucene90CompressingStoredFieldsFormat` for its stored fields and delegates to the default codec for everything else.
ConfigurableMCodec
This codec allows customization of the number of connections made for an hnsw index.
CorruptingIndexOutput
Corrupts on bit of a file after close
CrankyCodec
Codec for testing that throws random IOExceptions
CrankyTokenFilter
Throws IOException from random Tokenstream methods.
DeflateWithPresetCompressingCodec
CompressionCodec that uses `DeflateWithPresetDictCompressionMode`.
DisableFsyncFS
Disables actual calls to fsync.
DisablingBulkScorerQuery
A `Query` wrapper that disables bulk-scoring optimizations.
DocHelper
Helper functions for tests that handles documents
DummyCompressingCodec
CompressionCodec that does not compress data, useful for testing.
DummyTotalHitCountCollector
A dummy version of `TotalHitCountCollector` that doesn't shortcut using `Weight.count(org.apache.lucene.index.LeafReaderContext)`.
EarthDebugger
Draws shapes on the earth surface and renders using the very cool http://www.webglearth.org.
EmojiTokenizationTestUnicode_12_1
This class was automatically generated by generateEmojiTokenizationTest.pl.
English
Converts numbers to english strings for testing.
ExtrasFS
Adds extra files/subdirectories when directories are created.
FailOnNonBulkMergesInfoStream
Hackidy-Häck-Hack to cause a test to fail on non-bulk merges
FailureMarker
A `RunListener` that detects suite/ test failures.
FastCompressingCodec
CompressionCodec that uses `CompressionMode.FAST`
FastDecompressionCompressingCodec
CompressionCodec that uses `CompressionMode.FAST_DECOMPRESSION`
FieldFilterLeafReader
A `FilterLeafReader` that exposes only a subset of fields from the underlying wrapped reader.
FilterAsynchronousFileChannel
A `FilterAsynchronousFileChannel` contains another `AsynchronousFileChannel`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterDirectoryStream
A `FilterDirectoryStream` contains another `DirectoryStream`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterFileChannel
A `FilterFileChannel` contains another `FileChannel`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterFileStore
A `FilterFileStore` contains another `FileStore`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterFileSystem
A `FilterFileSystem` contains another `FileSystem`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterFileSystemProvider
A `FilterFileSystemProvider` contains another `FileSystemProvider`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterInputStream2
A `FilterInputStream2` contains another `InputStream`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterOutputStream2
A `FilterOutputStream2` contains another `OutputStream`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterPath
A `FilterPath` contains another `Path`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterSeekableByteChannel
A `FilterSeekableByteChannel` contains another `SeekableByteChannel`, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FixedBitSetCollector
Collector that accumulates matching docs in a `FixedBitSet`
ForceMergePolicy
A `MergePolicy` that only returns forced merges.
FSTTester<T>
Helper class to test FSTs.
FSTTester.InputOutput<T>
Holds one input/output pair.
GeoTestUtil
static methods for testing geo
HandleLimitFS
FileSystem that throws exception if file handles in use exceeds a specified limit.
HandleLimitFS.MaxOpenHandles
An annotation
HandleTrackingFS
Base class for tracking file handles.
HighCompressionCompressingCodec
CompressionCodec that uses `CompressionMode.HIGH_COMPRESSION`
LeakFS
FileSystem that tracks open handles.
LegacyBaseDocValuesFormatTestCase
Abstract class to do basic tests for a docvalues format.
LineFileDocs
Minimal port of benchmark's LneDocSource + DocMaker, so tests can enum docs from a line file created by benchmark's WriteLineDoc task
LookaheadTokenFilter<T>
An abstract TokenFilter to make it easier to build graph token filters requiring some lookahead.
LookaheadTokenFilter.Position
Holds all state for a single position; subclass this to record other state at each position.
LuceneFixedGap
Customized version of `Lucene912PostingsFormat` that uses `FixedGapTermsIndexWriter`.
LuceneJUnit3MethodProvider
Backwards compatible test* method provider (public, non-static).
LuceneTestCase
Base class for all Lucene unit tests, Junit3 or Junit4 variant.
LuceneTestCase.AwaitsFix
Annotation for tests which exhibit a known issue and are temporarily disabled.
LuceneTestCase.Concurrency
What level of concurrency is supported by the searcher being created
LuceneTestCase.Monster
Annotation for monster tests that require special setup (e.g.
LuceneTestCase.Nightly
Annotation for tests that should only be run during nightly builds.
LuceneTestCase.SuppressCodecs
Annotation for test classes that should avoid certain codec types (because they are expensive, for example).
LuceneTestCase.SuppressFileSystems
Annotation for test classes that should avoid mock filesystem types (because they test a bug that only happens on linux, for example).
LuceneTestCase.SuppressFsync
Annotation for test classes that should avoid always omit actual fsync calls from reaching the filesystem.
LuceneTestCase.SuppressReproduceLine
Suppress the default `reproduce with: ant test...` Your own listener can be added as needed for your build.
LuceneTestCase.SuppressSysoutChecks
Ignore `TestRuleLimitSysouts` for any suite which is known to print over the default limit of bytes to `System.out` or `System.err`.
LuceneTestCase.SuppressTempFileChecks
Marks any suites which are known not to close all the temporary files.
LuceneTestCase.ThrowingConsumer<T>
A `Consumer` that can throw any checked exception.
LuceneTestCase.ThrowingRunnable
A runnable that can throw any checked exception.
LuceneTestCase.Weekly
Annotation for tests that should only be run during weekly builds
LuceneVarGapDocFreqInterval
Customized version of `Lucene912PostingsFormat` that uses `VariableGapTermsIndexWriter` with a fixed interval, but forcing high docfreq terms to be indexed terms.
LuceneVarGapFixedInterval
Customized version of `Lucene912PostingsFormat` that uses `VariableGapTermsIndexWriter` with a fixed interval.
LZ4WithPresetCompressingCodec
CompressionCodec that uses `LZ4WithPresetDictCompressionMode`.
MatchesTestBase
Base class for tests checking the `Weight.matches(LeafReaderContext, int)` implementations
MatchesTestBase.TermMatch
Encapsulates a term position, start and end offset
MergingCodecReader
`CodecReader` wrapper that performs all reads using the merging instance of the index formats.
MergingDirectoryReaderWrapper
`DirectoryReader` wrapper that uses the merge instances of the wrapped `CodecReader`s.
MismatchedCodecReader
Shuffles field numbers around to try to trip bugs where field numbers are assumed to always be consistent across segments.
MismatchedDirectoryReader
A `DirectoryReader` that wraps all its subreaders with `MismatchedLeafReader`
MismatchedLeafReader
Shuffles field numbers around to try to trip bugs where field numbers are assumed to always be consistent across segments.
MockAnalyzer
Analyzer for testing
MockBytesAnalyzer
Analyzer for testing that encodes terms as UTF-16 bytes.
MockCharFilter
the purpose of this charfilter is to send offsets out of bounds if the analyzer doesn't use correctOffset or does incorrect offset math.
MockDirectoryWrapper
This is a Directory Wrapper that adds methods intended to be used only by unit tests.
MockDirectoryWrapper.Failure
Objects that represent fail-able conditions.
MockDirectoryWrapper.FakeIOException
Use this when throwing fake `IOException`, e.g.
MockDirectoryWrapper.Throttling
Enum for controlling hard disk throttling.
MockFileSystemTestCase
Base class for testing mockfilesystems.
MockFixedLengthPayloadFilter
TokenFilter that adds random fixed-length payloads.
MockGraphTokenFilter
Randomly inserts overlapped (posInc=0) tokens with posLength sometimes > 1.
MockHoleInjectingTokenFilter
Randomly injects holes (similar to what a stopfilter would do)
MockIndexInputWrapper
Used by MockDirectoryWrapper to create an input stream that keeps track of when it's been closed.
MockIndexOutputWrapper
Used to create an output stream that will throw an IOException on fake disk full, track max disk space actually used, and maybe throw random IOExceptions.
MockIndexWriterEventListener
Mock IndexWriterEventListener to verify invocation of event methods
MockLowerCaseFilter
A lowercasing `TokenFilter`.
MockPayloadAnalyzer
Wraps a whitespace tokenizer with a filter that sets the first token, and odd tokens to posinc=1, and all others to 0, encoding the position as pos: XXX in the payload.
MockRandomLookaheadTokenFilter
Uses `LookaheadTokenFilter` to randomly peek at future tokens.
MockRandomMergePolicy
MergePolicy that makes random decisions for testing.
MockRandomPostingsFormat
Randomly combines terms index impl w/ postings impls.
MockReaderWrapper
Wraps a Reader, and can throw random or fixed exceptions, and spoon feed read chars.
MockSynonymAnalyzer
adds synonym of "dog" for "dogs", and synonym of "cavy" for "guinea pig".
MockSynonymFilter
adds synonym of "dog" for "dogs", and synonym of "cavy" for "guinea pig".
MockTokenFilter
A tokenfilter for testing that removes terms accepted by a DFA.
MockTokenizer
Tokenizer for testing.
MockUTF16TermAttributeImpl
Extension of `CharTermAttributeImpl` that encodes the term text as UTF-16 bytes instead of as UTF-8 bytes.
MockVariableLengthPayloadFilter
TokenFilter that adds random variable-length payloads.
NullInfoStream
Prints nothing.
OwnCacheKeyMultiReader
A `MultiReader` that has its own cache key, occasionally useful for testing purposes.
PerThreadPKLookup
Utility class to do efficient primary-key (only 1 doc contains the given term) lookups by segment, re-using the enums.
PointsStackTracker
Simple utility class to track the current BKD stack based solely on calls to `PointValues.IntersectVisitor.compare(byte[], byte[])`.
QueryUtils
Utility class for sanity-checking queries.
QuickPatchThreadsFilter
Last minute patches.
RAMOnlyPostingsFormat
Stores all postings data in RAM, but writes a small token (header + single int) to identify which "slot" the index is using in RAM HashMap.
RamUsageTester
Crawls object graph to collect RAM usage for testing
RamUsageTester.Accumulator
An accumulator of object references.
RandomApproximationQuery
A `Query` that adds random approximations to its scorers.
RandomApproximationQuery.RandomTwoPhaseView
A wrapper around a `DocIdSetIterator` that matches the same documents, but introduces false positives that need to be verified via `TwoPhaseIterator.matches()`.
RandomCodec
Codec that assigns per-field random postings formats.
RandomIndexWriter
Silly class that randomizes the indexing experience.
RandomIndexWriter.TestPoint
Simple interface that is executed for each `TP` `InfoStream` component message.
RandomPostingsTester
Helper class extracted from BasePostingsFormatTestCase to exercise a postings format.
RandomPostingsTester.FieldAndTerm
Holds one field, term and ord.
RandomPostingsTester.Option
Which features to test.
RandomPostingsTester.SeedPostings
Given the same random seed this always enumerates the same random postings
RandomSimilarity
Similarity implementation that randomizes Similarity implementations per-field.
RawDirectoryWrapper
Delegates all operations, even optional ones, to the wrapped directory.
Rethrow
Sneaky: rethrowing checked exceptions as unchecked ones.
Rot13CypherTestUtil
Test utility for simple ROT13 cipher (https://en.wikipedia.org/wiki/ROT13).
RunListenerPrintReproduceInfo
A suite listener printing a "reproduce string".
ScorerIndexSearcher
An `IndexSearcher` that always uses the `Scorer` API, never `BulkScorer`.
SearchEquivalenceTestBase
Simple base class for checking search equivalence.
SerialIOCountingDirectory
A `Directory` wrapper that counts the number of times that Lucene may wait for I/O to return serially.
ShapeTestUtil
generates random cartesian geometry; heavy reuse of `GeoTestUtil`
ShardSearchingTestBase
Base test class for simulating distributed search across multiple shards.
ShardSearchingTestBase.SearcherAndVersion
An IndexSearcher and associated version (lease)
ShardSearchingTestBase.SearcherExpiredException
Thrown when the lease for a searcher has expired.
ShuffleFS
Gives an unpredictable, but deterministic order to directory listings.
SimplePayloadFilter
Simple payload filter that sets the payload as pos: XXXX
StringMockResourceLoader
Fake resource loader for tests: works if you want to fake reading a single file
STUniformSplitRot13PostingsFormat
`STUniformSplitPostingsFormat` with block encoding using ROT13 cypher.
SuppressingConcurrentMergeScheduler
A `ConcurrentMergeScheduler` that ignores AlreadyClosedException.
TestBloomFilteredLucenePostings
A class used for testing `BloomFilteringPostingsFormat` with a concrete delegate (Lucene41).
TestRuleAssertionsRequired
Require assertions for Lucene packages.
TestRuleIgnoreAfterMaxFailures
This rule keeps a count of failed tests (suites) and will result in an `AssumptionViolatedException` after a given number of failures for all tests following this condition.
TestRuleIgnoreTestSuites
This rule will cause the suite to be assumption-ignored if the test class implements a given marker interface and a special property is not set.
TestRuleIgnoreTestSuites.NestedTestSuite
Marker interface for nested suites that should be ignored if executed in stand-alone mode.
TestRuleLimitSysouts
This test rule serves two purposes: it fails the test if it prints too much to stdout and stderr (tests that chatter too much are discouraged) the rule ensures an absolute hard limit of stuff written to stdout and stderr to prevent accidental infinite loops from filling all available disk space with persisted output.
TestRuleLimitSysouts.Limit
An annotation specifying the limit of bytes per class.
TestRuleMarkFailure
A rule for marking failed tests and suites.
TestRuleRestoreSystemProperties
Restore a given set of system properties to a snapshot taken at the beginning of the rule.
TestRuleStoreClassName
Stores the suite name so you can retrieve it from `TestRuleStoreClassName.getTestClass()`
TestSecurityManager
A `SecurityManager` that prevents tests calling `System.exit(int)`.
TestUtil
General utility methods for Lucene unit tests.
ThreadedIndexingAndSearchingTestCase
Utility class that spawns multiple indexing and searching threads.
ThrottledIndexOutput
Intentionally slow IndexOutput for testing.
TimeUnits
time unit constants for use in annotations.
Token
A Token is an occurrence of a term from the text of a field.
TokenStreamToDot
Consumes a TokenStream and outputs the dot (graphviz) string (graph).
UniformSplitRot13PostingsFormat
`UniformSplitPostingsFormat` with block encoding using ROT13 cypher.
ValidatingTokenFilter
A TokenFilter that checks consistency of the tokens (eg offsets are consistent with one another).
VerboseFS
FileSystem that records all major destructive filesystem activities.
VerifyTestClassNamingConvention
Enforce test naming convention.
VirusCheckingFS
Acts like a virus checker on Windows, where random programs may open the files you just wrote in an unfriendly way preventing deletion (e.g.
VocabularyAssert
Utility class for doing vocabulary-based stemming tests
WindowsFS
FileSystem that (imperfectly) acts like windows.
WordBreakTestUnicode_12_1_0
This class was automatically generated by generateJavaUnicodeWordBreakTest.pl from: http://www.unicode.org/Public/12.1.0/ucd/auxiliary/WordBreakTest.txt