org.apache.lucene.analysis

Class MockAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.MockAnalyzer

All Implemented Interfaces:

Closeable

public final class MockAnalyzer
extends Analyzer

Analyzer for testing

This analyzer is a replacement for Whitespace/Simple/KeywordAnalyzers for unit tests. If you are testing a custom component such as a queryparser or analyzer-wrapper that consumes analysis streams, its a great idea to test it with this analyzer instead. MockAnalyzer has the following behavior:

• By default, the assertions in MockTokenizer are turned on for extra checks that the consumer is consuming properly. These checks can be disabled with setEnableChecks(boolean).
• Payload data is randomly injected into the stream for more thorough testing of payloads.

See Also:

MockTokenizer

Constructor Summary

Constructors

Constructor and Description
MockAnalyzer(Random random) Create a Whitespace-lowercasing analyzer with no stopwords removal.
MockAnalyzer(Random random, int pattern, boolean lowerCase) Calls MockAnalyzer(random, pattern, lowerCase, CharArraySet.EMPTY_STOPSET, false).
MockAnalyzer(Random random, int pattern, boolean lowerCase, CharArraySet filter, boolean enablePositionIncrements) Creates a new MockAnalyzer.

Method Summary

Methods

Modifier and Type	Method and Description
int	getPositionIncrementGap(String fieldName) Invoked before indexing a Fieldable instance if terms have already been added to that field.
TokenStream	reusableTokenStream(String fieldName, Reader reader) Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method.
void	setEnableChecks(boolean enableChecks) Toggle consumer workflow checking: if your test consumes tokenstreams normally you should leave this enabled.
void	setMaxTokenLength(int length) Toggle maxTokenLength for MockTokenizer
void	setPositionIncrementGap(int positionIncrementGap)
TokenStream	tokenStream(String fieldName, Reader reader) Creates a TokenStream which tokenizes all the text in the provided Reader.

Methods inherited from class org.apache.lucene.analysis.Analyzer

close, getOffsetGap, getPreviousTokenStream, setPreviousTokenStream

Methods inherited from class java.lang.Object

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

Constructor Detail

MockAnalyzer

public MockAnalyzer(Random random,
            int pattern,
            boolean lowerCase,
            CharArraySet filter,
            boolean enablePositionIncrements)

Creates a new MockAnalyzer.

Parameters:

random - Random for payloads behavior

pattern - pattern constant describing how tokenization should happen

lowerCase - true if the tokenizer should lowercase terms

filter - CharArraySet describing how terms should be filtered (set of stopwords, etc)

enablePositionIncrements - true if position increments should reflect filtered terms.

MockAnalyzer

public MockAnalyzer(Random random,
            int pattern,
            boolean lowerCase)

Calls MockAnalyzer(random, pattern, lowerCase, CharArraySet.EMPTY_STOPSET, false).

MockAnalyzer

public MockAnalyzer(Random random)

Create a Whitespace-lowercasing analyzer with no stopwords removal.

Calls MockAnalyzer(random, MockTokenizer.WHITESPACE, true).

Method Detail

tokenStream

public TokenStream tokenStream(String fieldName,
                      Reader reader)

Description copied from class: Analyzer

Creates a TokenStream which tokenizes all the text in the provided Reader. Must be able to handle null field name for backward compatibility.

Specified by:

tokenStream in class Analyzer

reusableTokenStream

public TokenStream reusableTokenStream(String fieldName,
                              Reader reader)
                                throws IOException

Description copied from class: Analyzer

Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method. Callers that do not need to use more than one TokenStream at the same time from this analyzer should use this method for better performance.

Overrides:

reusableTokenStream in class Analyzer

Throws:

IOException

setPositionIncrementGap

public void setPositionIncrementGap(int positionIncrementGap)

getPositionIncrementGap

public int getPositionIncrementGap(String fieldName)

Description copied from class: Analyzer

Invoked before indexing a Fieldable instance if terms have already been added to that field. This allows custom analyzers to place an automatic position increment gap between Fieldable instances using the same field name. The default value position increment gap is 0. With a 0 position increment gap and the typical default token position increment of 1, all terms in a field, including across Fieldable instances, are in successive positions, allowing exact PhraseQuery matches, for instance, across Fieldable instance boundaries.

Overrides:

getPositionIncrementGap in class Analyzer

Parameters:

fieldName - Fieldable name being indexed.

Returns:

position increment gap, added to the next token emitted from Analyzer.tokenStream(String,Reader)

setEnableChecks

public void setEnableChecks(boolean enableChecks)

Toggle consumer workflow checking: if your test consumes tokenstreams normally you should leave this enabled.

setMaxTokenLength

public void setMaxTokenLength(int length)

Toggle maxTokenLength for MockTokenizer