/
ToElasticsearch.java
589 lines (511 loc) · 19.9 KB
/
ToElasticsearch.java
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/*
* Hibernate Search, full-text search for your domain model
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.search.elasticsearch.impl;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.FilteredQuery;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.NumericRangeQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.QueryWrapperFilter;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TermRangeQuery;
import org.apache.lucene.search.WildcardQuery;
import org.hibernate.search.backend.spi.DeletionQuery;
import org.hibernate.search.elasticsearch.logging.impl.Log;
import org.hibernate.search.elasticsearch.util.impl.FieldHelper;
import org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity;
import org.hibernate.search.filter.impl.CachingWrapperFilter;
import org.hibernate.search.query.dsl.impl.DiscreteFacetRequest;
import org.hibernate.search.query.dsl.impl.FacetRange;
import org.hibernate.search.query.dsl.impl.RangeFacetRequest;
import org.hibernate.search.query.dsl.impl.RemoteMatchQuery;
import org.hibernate.search.query.dsl.impl.RemotePhraseQuery;
import org.hibernate.search.query.facet.FacetSortOrder;
import org.hibernate.search.query.facet.FacetingRequest;
import org.hibernate.search.spatial.impl.DistanceFilter;
import org.hibernate.search.spatial.impl.SpatialHashFilter;
import org.hibernate.search.util.StringHelper;
import org.hibernate.search.util.logging.impl.LoggerFactory;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
/**
* Various utilities to transform Hibernate Search API into Elasticsearch JSON.
*
* @author Guillaume Smet
* @author Gunnar Morling
*/
public class ToElasticsearch {
/*
* A specific suffix for facet fields that avoids conflicts with existing names.
*/
public static final String FACET_FIELD_SUFFIX = "__HSearch_Facet";
private static final Log LOG = LoggerFactory.make( Log.class );
private static final int DEFAULT_SLOP = 0;
private static final int DEFAULT_MAX_EDIT_DISTANCE = 0;
private static final float DEFAULT_BOOST = 1.0f;
private ToElasticsearch() {
}
public static void addFacetingRequest(JsonBuilder.Object jsonQuery, FacetingRequest facetingRequest,
String sourceFieldAbsoluteName, String facetRelativeName) {
String aggregationFieldName = sourceFieldAbsoluteName + "." + facetRelativeName + FACET_FIELD_SUFFIX;
if ( facetingRequest instanceof DiscreteFacetRequest ) {
JsonObject termsJsonQuery = JsonBuilder.object().add( "terms",
JsonBuilder.object()
.addProperty( "field", aggregationFieldName )
.addProperty( "size", facetingRequest.getMaxNumberOfFacets() == -1 ? Integer.MAX_VALUE : facetingRequest.getMaxNumberOfFacets() )
.add( "order", fromFacetSortOrder( facetingRequest.getSort() ) )
.addProperty( "min_doc_count", facetingRequest.hasZeroCountsIncluded() ? 0 : 1 )
).build();
if ( isNested( sourceFieldAbsoluteName ) ) {
JsonBuilder.Object facetJsonQuery = JsonBuilder.object();
facetJsonQuery.add( "nested", JsonBuilder.object()
.addProperty( "path", FieldHelper.getEmbeddedFieldPath( sourceFieldAbsoluteName ) + "." + facetRelativeName + FACET_FIELD_SUFFIX ) );
facetJsonQuery.add( "aggregations", JsonBuilder.object().add( aggregationFieldName, termsJsonQuery ) );
jsonQuery.add( facetingRequest.getFacetingName(), facetJsonQuery );
}
else {
jsonQuery.add( facetingRequest.getFacetingName(), termsJsonQuery );
}
}
else if ( facetingRequest instanceof RangeFacetRequest<?> ) {
RangeFacetRequest<?> rangeFacetingRequest = (RangeFacetRequest<?>) facetingRequest;
for ( FacetRange<?> facetRange : rangeFacetingRequest.getFacetRangeList() ) {
JsonBuilder.Object comparisonFragment = JsonBuilder.object();
if ( facetRange.getMin() != null ) {
comparisonFragment.addProperty( facetRange.isMinIncluded() ? "gte" : "gt", facetRange.getMin() );
}
if ( facetRange.getMax() != null ) {
comparisonFragment.addProperty( facetRange.isMaxIncluded() ? "lte" : "lt", facetRange.getMax() );
}
JsonObject rangeQuery = wrapQueryForNestedIfRequired( aggregationFieldName,
JsonBuilder.object().add( "range",
JsonBuilder.object().add( aggregationFieldName, comparisonFragment ) ).build() );
jsonQuery.add( facetingRequest.getFacetingName() + "-" + facetRange.getIdentifier(),
JsonBuilder.object().add( "filter", rangeQuery ) );
}
}
else {
throw LOG.facetingRequestHasUnsupportedType( facetingRequest.getClass().getName() );
}
}
private static JsonObject fromFacetSortOrder(FacetSortOrder sortOrder) {
JsonObject sort = new JsonObject();
switch ( sortOrder ) {
case COUNT_ASC:
sort.addProperty( "_count", "asc" );
break;
case COUNT_DESC:
sort.addProperty( "_count", "desc" );
break;
case FIELD_VALUE:
sort.addProperty( "_term", "asc" );
break;
case RANGE_DEFINITION_ORDER:
throw LOG.cannotSendRangeDefinitionOrderToElasticsearchBackend();
}
return sort;
}
public static JsonObject condition(String operator, JsonArray conditions) {
JsonObject jsonCondition;
if ( conditions.size() == 1 ) {
jsonCondition = conditions.get( 0 ).getAsJsonObject();
}
else {
jsonCondition = JsonBuilder.object().add( "bool",
JsonBuilder.object().add( operator, conditions ) ).build();
}
return jsonCondition;
}
public static JsonObject fromLuceneQuery(Query query) {
if ( query instanceof MatchAllDocsQuery ) {
return convertMatchAllDocsQuery( (MatchAllDocsQuery) query );
}
else if ( query instanceof TermQuery ) {
return convertTermQuery( (TermQuery) query );
}
else if ( query instanceof BooleanQuery ) {
return convertBooleanQuery( (BooleanQuery) query );
}
else if ( query instanceof TermRangeQuery ) {
return convertTermRangeQuery( (TermRangeQuery) query );
}
else if ( query instanceof NumericRangeQuery ) {
return convertNumericRangeQuery( (NumericRangeQuery<?>) query );
}
else if ( query instanceof WildcardQuery ) {
return convertWildcardQuery( (WildcardQuery) query );
}
else if ( query instanceof PrefixQuery ) {
return convertPrefixQuery( (PrefixQuery) query );
}
else if ( query instanceof FuzzyQuery ) {
return convertFuzzyQuery( (FuzzyQuery) query );
}
else if ( query instanceof RemotePhraseQuery ) {
return convertRemotePhraseQuery( (RemotePhraseQuery) query );
}
else if ( query instanceof RemoteMatchQuery ) {
return convertRemoteMatchQuery( (RemoteMatchQuery) query );
}
else if ( query instanceof ConstantScoreQuery ) {
return convertConstantScoreQuery( (ConstantScoreQuery) query );
}
else if ( query instanceof FilteredQuery ) {
return convertFilteredQuery( (FilteredQuery) query );
}
else if ( query instanceof Filter ) {
return fromLuceneFilter( (Filter) query );
}
else if ( query instanceof PhraseQuery ) {
return convertPhraseQuery( (PhraseQuery) query );
}
throw LOG.cannotTransformLuceneQueryIntoEsQuery( query );
}
public static JsonObject fromDeletionQuery(DocumentBuilderIndexedEntity documentBuilder, DeletionQuery deletionQuery) {
return fromLuceneQuery( deletionQuery.toLuceneQuery( documentBuilder ) );
}
private static JsonObject convertMatchAllDocsQuery(MatchAllDocsQuery matchAllDocsQuery) {
return JsonBuilder.object().add( "match_all", new JsonObject() ).build();
}
private static JsonObject convertBooleanQuery(BooleanQuery booleanQuery) {
JsonArray musts = new JsonArray();
JsonArray shoulds = new JsonArray();
JsonArray mustNots = new JsonArray();
JsonArray filters = new JsonArray();
for ( BooleanClause clause : booleanQuery.clauses() ) {
switch ( clause.getOccur() ) {
case MUST:
musts.add( fromLuceneQuery( clause.getQuery() ) );
break;
case FILTER:
filters.add( fromLuceneQuery( clause.getQuery() ) );
break;
case MUST_NOT:
mustNots.add( fromLuceneQuery( clause.getQuery() ) );
break;
case SHOULD:
shoulds.add( fromLuceneQuery( clause.getQuery() ) );
break;
}
}
JsonObject clauses = new JsonObject();
if ( musts.size() > 1 ) {
clauses.add( "must", musts );
}
else if ( musts.size() == 1 ) {
clauses.add( "must", musts.iterator().next() );
}
if ( shoulds.size() > 1 ) {
clauses.add( "should", shoulds );
}
else if ( shoulds.size() == 1 ) {
clauses.add( "should", shoulds.iterator().next() );
}
if ( mustNots.size() > 1 ) {
clauses.add( "must_not", mustNots );
}
else if ( mustNots.size() == 1 ) {
clauses.add( "must_not", mustNots.iterator().next() );
}
if ( filters.size() > 1 ) {
clauses.add( "filter", filters );
}
else if ( filters.size() == 1 ) {
clauses.add( "filter", filters.iterator().next() );
}
JsonObject bool = new JsonObject();
bool.add( "bool", clauses );
return bool;
}
private static JsonObject convertTermQuery(TermQuery query) {
String field = query.getTerm().field();
JsonObject matchQuery = JsonBuilder.object()
.add( "term",
JsonBuilder.object().add( field,
JsonBuilder.object()
.addProperty( "value", query.getTerm().text() )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( field, matchQuery );
}
private static JsonObject convertWildcardQuery(WildcardQuery query) {
String field = query.getTerm().field();
JsonObject wildcardQuery = JsonBuilder.object()
.add( "wildcard",
JsonBuilder.object().add( field,
JsonBuilder.object()
.addProperty( "value", query.getTerm().text() )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( field, wildcardQuery );
}
private static JsonObject convertPrefixQuery(PrefixQuery query) {
String field = query.getField();
JsonObject wildcardQuery = JsonBuilder.object()
.add( "prefix",
JsonBuilder.object().add( field,
JsonBuilder.object()
.addProperty( "value", query.getPrefix().text() )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( field, wildcardQuery );
}
private static JsonObject convertFuzzyQuery(FuzzyQuery query) {
String field = query.getTerm().field();
JsonObject fuzzyQuery = JsonBuilder.object()
.add( "fuzzy",
JsonBuilder.object().add( field,
JsonBuilder.object()
.addProperty( "value", query.getTerm().text() )
.addProperty( "fuzziness", query.getMaxEdits() )
.addProperty( "prefix_length", query.getPrefixLength() )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( field, fuzzyQuery );
}
/**
* This is best effort only: the PhraseQuery may contain multiple terms at the same position
* (think synonyms) or gaps (think stopwords) and it's in this case impossible to translate
* it into a correct ElasticsearchQuery.
*/
private static JsonObject convertPhraseQuery(PhraseQuery query) {
Term[] terms = query.getTerms();
if ( terms.length == 0 ) {
throw LOG.cannotQueryOnEmptyPhraseQuery();
}
String field = terms[0].field(); // phrase queries are only supporting one field
StringBuilder phrase = new StringBuilder();
for ( Term term : terms ) {
phrase.append( " " ).append( term.text() );
}
JsonObject phraseQuery = JsonBuilder.object()
.add( "match_phrase",
JsonBuilder.object().add( field,
JsonBuilder.object()
.addProperty( "query", phrase.toString().trim() )
.append( slopAppender( query.getSlop() ) )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( field, phraseQuery );
}
private static JsonObject convertRemotePhraseQuery(RemotePhraseQuery query) {
if ( StringHelper.isEmpty( query.getPhrase() ) ) {
throw LOG.cannotQueryOnEmptyPhraseQuery();
}
JsonObject phraseQuery = JsonBuilder.object()
.add( "match_phrase",
JsonBuilder.object().add( query.getField(),
JsonBuilder.object()
.addProperty( "query", query.getPhrase().trim() )
.addProperty( "analyzer", query.getAnalyzerReference().getAnalyzer().getName( query.getField() ) )
.append( slopAppender( query.getSlop() ) )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( query.getField(), phraseQuery );
}
private static JsonObject convertRemoteMatchQuery(RemoteMatchQuery query) {
JsonObject matchQuery = JsonBuilder.object()
.add( "match",
JsonBuilder.object().add( query.getField(),
JsonBuilder.object()
.addProperty( "query", query.getSearchTerms() )
.addProperty( "analyzer", query.getAnalyzerReference().getAnalyzer().getName( query.getField() ) )
.append( fuzzinessAppender( query.getMaxEditDistance() ) )
.append( boostAppender( query ) )
)
).build();
return wrapQueryForNestedIfRequired( query.getField(), matchQuery );
}
private static JsonObject convertTermRangeQuery(TermRangeQuery query) {
JsonBuilder.Object interval = JsonBuilder.object();
if ( query.getLowerTerm() != null ) {
interval.addProperty( query.includesLower() ? "gte" : "gt", query.getLowerTerm().utf8ToString() );
}
if ( query.getUpperTerm() != null ) {
interval.addProperty( query.includesUpper() ? "lte" : "lt", query.getUpperTerm().utf8ToString() );
}
interval.append( boostAppender( query ) );
JsonObject range = JsonBuilder.object().add( "range",
JsonBuilder.object().add( query.getField(), interval ) )
.build();
return wrapQueryForNestedIfRequired( query.getField(), range );
}
private static JsonObject convertNumericRangeQuery(NumericRangeQuery<?> query) {
JsonBuilder.Object interval = JsonBuilder.object();
if ( query.getMin() != null ) {
interval.addProperty( query.includesMin() ? "gte" : "gt", query.getMin() );
}
if ( query.getMax() != null ) {
interval.addProperty( query.includesMax() ? "lte" : "lt", query.getMax() );
}
interval.append( boostAppender( query ) );
JsonObject range = JsonBuilder.object().add( "range",
JsonBuilder.object().add( query.getField(), interval ) )
.build();
return wrapQueryForNestedIfRequired( query.getField(), range );
}
private static JsonObject convertConstantScoreQuery(ConstantScoreQuery query) {
JsonObject constantScoreQuery = JsonBuilder.object()
.add( "constant_score",
JsonBuilder.object()
.add( "filter", fromLuceneQuery( query.getQuery() ) )
.append( boostAppender( query ) )
).build();
return constantScoreQuery;
}
private static JsonObject convertFilteredQuery(FilteredQuery query) {
JsonObject filteredQuery = JsonBuilder.object()
.add( "bool",
JsonBuilder.object()
.add( "must", fromLuceneQuery( query.getQuery() ) )
.add( "filter", fromLuceneQuery( query.getFilter() ) )
.append( boostAppender( query ) )
).build();
return filteredQuery;
}
private static JsonObject convertDistanceFilter(DistanceFilter filter) {
JsonObject distanceQuery = JsonBuilder.object()
.add( "geo_distance",
JsonBuilder.object()
.addProperty( "distance", filter.getRadius() + "km" )
.add( filter.getCoordinatesField(),
JsonBuilder.object()
.addProperty( "lat", filter.getCenter().getLatitude() )
.addProperty( "lon", filter.getCenter().getLongitude() )
)
).build();
distanceQuery = wrapQueryForNestedIfRequired( filter.getCoordinatesField(), distanceQuery );
// we only implement the previous filter optimization when we use the hash method as Elasticsearch
// automatically optimize the geo_distance query with a bounding box filter so we don't need to do it
// ourselves when we use the range method.
Filter previousFilter = filter.getPreviousFilter();
if ( previousFilter instanceof SpatialHashFilter ) {
distanceQuery = JsonBuilder.object()
.add( "bool", JsonBuilder.object()
.add( "must", distanceQuery )
.add( "filter", convertSpatialHashFilter( (SpatialHashFilter) previousFilter ) )
).build();
}
return distanceQuery;
}
private static JsonObject convertSpatialHashFilter(SpatialHashFilter filter) {
JsonArray cellsIdsJsonArray = new JsonArray();
for ( String cellId : filter.getSpatialHashCellsIds() ) {
cellsIdsJsonArray.add( cellId );
}
JsonObject spatialHashFilter = JsonBuilder.object()
.add( "terms", JsonBuilder.object()
.add( filter.getFieldName(), cellsIdsJsonArray )
).build();
return wrapQueryForNestedIfRequired( filter.getFieldName(), spatialHashFilter );
}
private static final JsonBuilder.JsonAppender<Object> NOOP_APPENDER =
new JsonBuilder.JsonAppender<Object>() {
@Override
public void append(Object appendable) {
// Do nothing
}
};
/**
* Appender that adds a "slop" property if necessary.
*/
private static JsonBuilder.JsonAppender<? super JsonBuilder.Object> slopAppender(final int slop) {
if ( slop != DEFAULT_SLOP ) {
return new JsonBuilder.JsonAppender<JsonBuilder.Object>() {
@Override
public void append(JsonBuilder.Object object) {
object.addProperty( "slop", slop );
}
};
}
else {
return NOOP_APPENDER;
}
}
/**
* Appender that adds a "fuzziness" property if necessary.
*/
private static JsonBuilder.JsonAppender<? super JsonBuilder.Object> fuzzinessAppender(final int maxEditDistance) {
if ( maxEditDistance != DEFAULT_MAX_EDIT_DISTANCE ) {
return new JsonBuilder.JsonAppender<JsonBuilder.Object>() {
@Override
public void append(JsonBuilder.Object object) {
object.addProperty( "fuzziness", maxEditDistance );
}
};
}
else {
return NOOP_APPENDER;
}
}
/**
* Appender that adds a "boost" property if necessary.
*/
private static JsonBuilder.JsonAppender<? super JsonBuilder.Object> boostAppender(Query query) {
final float boost = query.getBoost();
if ( boost != DEFAULT_BOOST ) { // We actually want to use float equality here
return new JsonBuilder.JsonAppender<JsonBuilder.Object>() {
@Override
public void append(JsonBuilder.Object object) {
object.addProperty( "boost", boost );
}
};
}
else {
return NOOP_APPENDER;
}
}
private static JsonObject wrapQueryForNestedIfRequired(String field, JsonObject query) {
if ( !isNested( field ) ) {
return query;
}
String path = FieldHelper.getEmbeddedFieldPath( field );
return JsonBuilder.object().add( "nested",
JsonBuilder.object()
.addProperty( "path", path )
.add( "query", query ) )
.build();
}
private static boolean isNested(String field) {
//TODO Drive through meta-data
// return FieldHelper.isEmbeddedField( field );
return false;
}
public static JsonObject fromLuceneFilter(Filter luceneFilter) {
if ( luceneFilter instanceof QueryWrapperFilter ) {
Query query = ( (QueryWrapperFilter) luceneFilter ).getQuery();
query.setBoost( luceneFilter.getBoost() * query.getBoost() );
return fromLuceneQuery( query );
}
else if ( luceneFilter instanceof DistanceFilter ) {
return convertDistanceFilter( (DistanceFilter) luceneFilter );
}
else if ( luceneFilter instanceof SpatialHashFilter ) {
return convertSpatialHashFilter( (SpatialHashFilter) luceneFilter );
}
else if ( luceneFilter instanceof CachingWrapperFilter ) {
return fromLuceneFilter( ( (CachingWrapperFilter) luceneFilter ).getCachedFilter() );
}
else if ( luceneFilter instanceof org.apache.lucene.search.CachingWrapperFilter ) {
return fromLuceneFilter( ( (org.apache.lucene.search.CachingWrapperFilter) luceneFilter ).getFilter() );
}
throw LOG.cannotTransformLuceneFilterIntoEsQuery( luceneFilter );
}
}