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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.indices.analysis;
import org.apache.lucene.analysis.LowerCaseFilter;
import org.apache.lucene.analysis.TokenStream;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.common.NamedRegistry;
import org.elasticsearch.common.logging.DeprecationCategory;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.analysis.AbstractTokenFilterFactory;
import org.elasticsearch.index.analysis.AnalysisRegistry;
import org.elasticsearch.index.analysis.AnalyzerProvider;
import org.elasticsearch.index.analysis.CharFilterFactory;
import org.elasticsearch.index.analysis.HunspellTokenFilterFactory;
import org.elasticsearch.index.analysis.KeywordAnalyzerProvider;
import org.elasticsearch.index.analysis.LowercaseNormalizerProvider;
import org.elasticsearch.index.analysis.PreBuiltAnalyzerProviderFactory;
import org.elasticsearch.index.analysis.PreConfiguredCharFilter;
import org.elasticsearch.index.analysis.PreConfiguredTokenFilter;
import org.elasticsearch.index.analysis.PreConfiguredTokenizer;
import org.elasticsearch.index.analysis.ShingleTokenFilterFactory;
import org.elasticsearch.index.analysis.SimpleAnalyzerProvider;
import org.elasticsearch.index.analysis.StandardAnalyzerProvider;
import org.elasticsearch.index.analysis.StandardTokenizerFactory;
import org.elasticsearch.index.analysis.StopAnalyzerProvider;
import org.elasticsearch.index.analysis.StopTokenFilterFactory;
import org.elasticsearch.index.analysis.TokenFilterFactory;
import org.elasticsearch.index.analysis.TokenizerFactory;
import org.elasticsearch.index.analysis.WhitespaceAnalyzerProvider;
import org.elasticsearch.plugins.AnalysisPlugin;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import static java.util.Collections.unmodifiableMap;
import static org.elasticsearch.plugins.AnalysisPlugin.requiresAnalysisSettings;
/**
* Sets up {@link AnalysisRegistry}.
*/
public final class AnalysisModule {
static {
Settings build = Settings.builder()
.put(IndexMetadata.SETTING_VERSION_CREATED, Version.CURRENT)
.put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 1)
.put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, 1)
.build();
IndexMetadata metadata = IndexMetadata.builder("_na_").settings(build).build();
NA_INDEX_SETTINGS = new IndexSettings(metadata, Settings.EMPTY);
}
private static final IndexSettings NA_INDEX_SETTINGS;
private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(AnalysisModule.class);
private final HunspellService hunspellService;
private final AnalysisRegistry analysisRegistry;
public AnalysisModule(Environment environment, List plugins) throws IOException {
NamedRegistry> charFilters = setupCharFilters(plugins);
NamedRegistry hunspellDictionaries = setupHunspellDictionaries(plugins);
hunspellService = new HunspellService(environment.settings(), environment, hunspellDictionaries.getRegistry());
NamedRegistry> tokenFilters = setupTokenFilters(plugins, hunspellService);
NamedRegistry> tokenizers = setupTokenizers(plugins);
NamedRegistry>> analyzers = setupAnalyzers(plugins);
NamedRegistry>> normalizers = setupNormalizers(plugins);
Map preConfiguredCharFilters = setupPreConfiguredCharFilters(plugins);
Map preConfiguredTokenFilters = setupPreConfiguredTokenFilters(plugins);
Map preConfiguredTokenizers = setupPreConfiguredTokenizers(plugins);
Map preConfiguredAnalyzers = setupPreBuiltAnalyzerProviderFactories(plugins);
analysisRegistry = new AnalysisRegistry(
environment,
charFilters.getRegistry(),
tokenFilters.getRegistry(),
tokenizers.getRegistry(),
analyzers.getRegistry(),
normalizers.getRegistry(),
preConfiguredCharFilters,
preConfiguredTokenFilters,
preConfiguredTokenizers,
preConfiguredAnalyzers
);
}
HunspellService getHunspellService() {
return hunspellService;
}
public AnalysisRegistry getAnalysisRegistry() {
return analysisRegistry;
}
private NamedRegistry> setupCharFilters(List plugins) {
NamedRegistry> charFilters = new NamedRegistry<>("char_filter");
charFilters.extractAndRegister(plugins, AnalysisPlugin::getCharFilters);
return charFilters;
}
public NamedRegistry setupHunspellDictionaries(List plugins) {
NamedRegistry hunspellDictionaries = new NamedRegistry<>("dictionary");
hunspellDictionaries.extractAndRegister(plugins, AnalysisPlugin::getHunspellDictionaries);
return hunspellDictionaries;
}
private NamedRegistry> setupTokenFilters(
List plugins,
HunspellService hunspellService
) {
NamedRegistry> tokenFilters = new NamedRegistry<>("token_filter");
tokenFilters.register("stop", StopTokenFilterFactory::new);
// Add "standard" for old indices (bwc)
tokenFilters.register("standard", new AnalysisProvider() {
@Override
public TokenFilterFactory get(IndexSettings indexSettings, Environment environment, String name, Settings settings) {
if (indexSettings.getIndexVersionCreated().before(Version.V_7_0_0)) {
deprecationLogger.warn(
DeprecationCategory.ANALYSIS,
"standard_deprecation",
"The [standard] token filter name is deprecated and will be removed in a future version."
);
} else {
throw new IllegalArgumentException("The [standard] token filter has been removed.");
}
return new AbstractTokenFilterFactory(indexSettings, name, settings) {
@Override
public TokenStream create(TokenStream tokenStream) {
return tokenStream;
}
};
}
@Override
public boolean requiresAnalysisSettings() {
return false;
}
});
tokenFilters.register("shingle", ShingleTokenFilterFactory::new);
tokenFilters.register(
"hunspell",
requiresAnalysisSettings(
(indexSettings, env, name, settings) -> new HunspellTokenFilterFactory(indexSettings, name, settings, hunspellService)
)
);
tokenFilters.extractAndRegister(plugins, AnalysisPlugin::getTokenFilters);
return tokenFilters;
}
static Map setupPreBuiltAnalyzerProviderFactories(List plugins) {
NamedRegistry preConfiguredCharFilters = new NamedRegistry<>("pre-built analyzer");
for (AnalysisPlugin plugin : plugins) {
for (PreBuiltAnalyzerProviderFactory factory : plugin.getPreBuiltAnalyzerProviderFactories()) {
preConfiguredCharFilters.register(factory.getName(), factory);
}
}
return unmodifiableMap(preConfiguredCharFilters.getRegistry());
}
static Map setupPreConfiguredCharFilters(List plugins) {
NamedRegistry preConfiguredCharFilters = new NamedRegistry<>("pre-configured char_filter");
// No char filter are available in lucene-core so none are built in to Elasticsearch core
for (AnalysisPlugin plugin : plugins) {
for (PreConfiguredCharFilter filter : plugin.getPreConfiguredCharFilters()) {
preConfiguredCharFilters.register(filter.getName(), filter);
}
}
return unmodifiableMap(preConfiguredCharFilters.getRegistry());
}
static Map setupPreConfiguredTokenFilters(List plugins) {
NamedRegistry preConfiguredTokenFilters = new NamedRegistry<>("pre-configured token_filter");
// Add filters available in lucene-core
preConfiguredTokenFilters.register("lowercase", PreConfiguredTokenFilter.singleton("lowercase", true, LowerCaseFilter::new));
// Add "standard" for old indices (bwc)
preConfiguredTokenFilters.register(
"standard",
PreConfiguredTokenFilter.elasticsearchVersion("standard", true, (reader, version) -> {
// This was originally removed in 7_0_0 but due to a cacheing bug it was still possible
// in certain circumstances to create a new index referencing the standard token filter
// until version 7_5_2
if (version.before(Version.V_7_6_0)) {
deprecationLogger.warn(
DeprecationCategory.ANALYSIS,
"standard_deprecation",
"The [standard] token filter is deprecated and will be removed in a future version."
);
} else {
throw new IllegalArgumentException("The [standard] token filter has been removed.");
}
return reader;
})
);
/* Note that "stop" is available in lucene-core but it's pre-built
* version uses a set of English stop words that are in
* lucene-analyzers-common so "stop" is defined in the analysis-common
* module. */
for (AnalysisPlugin plugin : plugins) {
for (PreConfiguredTokenFilter filter : plugin.getPreConfiguredTokenFilters()) {
preConfiguredTokenFilters.register(filter.getName(), filter);
}
}
return unmodifiableMap(preConfiguredTokenFilters.getRegistry());
}
static Map setupPreConfiguredTokenizers(List plugins) {
NamedRegistry preConfiguredTokenizers = new NamedRegistry<>("pre-configured tokenizer");
// Temporary shim to register old style pre-configured tokenizers
for (PreBuiltTokenizers tokenizer : PreBuiltTokenizers.values()) {
String name = tokenizer.name().toLowerCase(Locale.ROOT);
PreConfiguredTokenizer preConfigured;
switch (tokenizer.getCachingStrategy()) {
case ONE:
preConfigured = PreConfiguredTokenizer.singleton(name, () -> tokenizer.create(Version.CURRENT));
break;
default:
throw new UnsupportedOperationException("Caching strategy unsupported by temporary shim [" + tokenizer + "]");
}
preConfiguredTokenizers.register(name, preConfigured);
}
for (AnalysisPlugin plugin : plugins) {
for (PreConfiguredTokenizer tokenizer : plugin.getPreConfiguredTokenizers()) {
preConfiguredTokenizers.register(tokenizer.getName(), tokenizer);
}
}
return unmodifiableMap(preConfiguredTokenizers.getRegistry());
}
private NamedRegistry> setupTokenizers(List plugins) {
NamedRegistry> tokenizers = new NamedRegistry<>("tokenizer");
tokenizers.register("standard", StandardTokenizerFactory::new);
tokenizers.extractAndRegister(plugins, AnalysisPlugin::getTokenizers);
return tokenizers;
}
private NamedRegistry>> setupAnalyzers(List plugins) {
NamedRegistry>> analyzers = new NamedRegistry<>("analyzer");
analyzers.register("default", StandardAnalyzerProvider::new);
analyzers.register("standard", StandardAnalyzerProvider::new);
analyzers.register("simple", SimpleAnalyzerProvider::new);
analyzers.register("stop", StopAnalyzerProvider::new);
analyzers.register("whitespace", WhitespaceAnalyzerProvider::new);
analyzers.register("keyword", KeywordAnalyzerProvider::new);
analyzers.extractAndRegister(plugins, AnalysisPlugin::getAnalyzers);
return analyzers;
}
private NamedRegistry>> setupNormalizers(List plugins) {
NamedRegistry>> normalizers = new NamedRegistry<>("normalizer");
normalizers.register("lowercase", LowercaseNormalizerProvider::new);
// TODO: pluggability?
return normalizers;
}
/**
* The basic factory interface for analysis components.
*/
public interface AnalysisProvider {
/**
* Creates a new analysis provider.
*
* @param indexSettings the index settings for the index this provider is created for
* @param environment the nodes environment to load resources from persistent storage
* @param name the name of the analysis component
* @param settings the component specific settings without context prefixes
* @return a new provider instance
* @throws IOException if an {@link IOException} occurs
*/
T get(IndexSettings indexSettings, Environment environment, String name, Settings settings) throws IOException;
/**
* Creates a new global scope analysis provider without index specific settings not settings for the provider itself.
* This can be used to get a default instance of an analysis factory without binding to an index.
*
* @param environment the nodes environment to load resources from persistent storage
* @param name the name of the analysis component
* @return a new provider instance
* @throws IOException if an {@link IOException} occurs
* @throws IllegalArgumentException if the provider requires analysis settings ie. if {@link #requiresAnalysisSettings()} returns
* true
*/
default T get(Environment environment, String name) throws IOException {
if (requiresAnalysisSettings()) {
throw new IllegalArgumentException("Analysis settings required - can't instantiate analysis factory");
}
return get(NA_INDEX_SETTINGS, environment, name, NA_INDEX_SETTINGS.getSettings());
}
/**
* If true the analysis component created by this provider requires certain settings to be instantiated.
* it can't be created with defaults. The default is false.
*/
default boolean requiresAnalysisSettings() {
return false;
}
}
}