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Histogram Facet: Allow to define a key field and value script, closes #…
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138 changes: 138 additions & 0 deletions
138
.../java/org/elasticsearch/search/facet/histogram/KeyValueScriptHistogramFacetCollector.java
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/* | |||
* Licensed to Elastic Search and Shay Banon under one | |||
* or more contributor license agreements. See the NOTICE file | |||
* distributed with this work for additional information | |||
* regarding copyright ownership. Elastic Search licenses this | |||
* file to you under the Apache License, Version 2.0 (the | |||
* "License"); you may not use this file except in compliance | |||
* with the License. You may obtain a copy of the License at | |||
* | |||
* http://www.apache.org/licenses/LICENSE-2.0 | |||
* | |||
* Unless required by applicable law or agreed to in writing, | |||
* software distributed under the License is distributed on an | |||
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |||
* KIND, either express or implied. See the License for the | |||
* specific language governing permissions and limitations | |||
* under the License. | |||
*/ | |||
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package org.elasticsearch.search.facet.histogram; | |||
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import org.apache.lucene.index.IndexReader; | |||
import org.elasticsearch.common.trove.TLongDoubleHashMap; | |||
import org.elasticsearch.common.trove.TLongLongHashMap; | |||
import org.elasticsearch.index.cache.field.data.FieldDataCache; | |||
import org.elasticsearch.index.field.data.FieldDataType; | |||
import org.elasticsearch.index.field.data.NumericFieldData; | |||
import org.elasticsearch.index.mapper.FieldMapper; | |||
import org.elasticsearch.index.mapper.MapperService; | |||
import org.elasticsearch.script.search.SearchScript; | |||
import org.elasticsearch.search.facet.Facet; | |||
import org.elasticsearch.search.facet.FacetPhaseExecutionException; | |||
import org.elasticsearch.search.facet.support.AbstractFacetCollector; | |||
import org.elasticsearch.search.internal.SearchContext; | |||
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import java.io.IOException; | |||
import java.util.Map; | |||
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/** | |||
* A histogram facet collector that uses the same field as the key as well as the | |||
* value. | |||
* | |||
* @author kimchy (shay.banon) | |||
*/ | |||
public class KeyValueScriptHistogramFacetCollector extends AbstractFacetCollector { | |||
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private final String fieldName; | |||
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private final String indexFieldName; | |||
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private final long interval; | |||
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private final HistogramFacet.ComparatorType comparatorType; | |||
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private final FieldDataCache fieldDataCache; | |||
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private final FieldDataType fieldDataType; | |||
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private NumericFieldData fieldData; | |||
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private final SearchScript valueScript; | |||
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private final HistogramProc histoProc; | |||
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public KeyValueScriptHistogramFacetCollector(String facetName, String fieldName, String scriptLang, String valueScript, Map<String, Object> params, long interval, HistogramFacet.ComparatorType comparatorType, SearchContext context) { | |||
super(facetName); | |||
this.fieldName = fieldName; | |||
this.interval = interval; | |||
this.comparatorType = comparatorType; | |||
this.fieldDataCache = context.fieldDataCache(); | |||
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MapperService.SmartNameFieldMappers smartMappers = context.mapperService().smartName(fieldName); | |||
if (smartMappers == null || !smartMappers.hasMapper()) { | |||
throw new FacetPhaseExecutionException(facetName, "No mapping found for field [" + fieldName + "]"); | |||
} | |||
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// add type filter if there is exact doc mapper associated with it | |||
if (smartMappers.hasDocMapper()) { | |||
setFilter(context.filterCache().cache(smartMappers.docMapper().typeFilter())); | |||
} | |||
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this.valueScript = new SearchScript(context.scriptSearchLookup(), scriptLang, valueScript, params, context.scriptService()); | |||
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FieldMapper mapper = smartMappers.mapper(); | |||
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indexFieldName = mapper.names().indexName(); | |||
fieldDataType = mapper.fieldDataType(); | |||
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histoProc = new HistogramProc(interval, this.valueScript); | |||
} | |||
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@Override protected void doCollect(int doc) throws IOException { | |||
fieldData.forEachValueInDoc(doc, histoProc); | |||
} | |||
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@Override protected void doSetNextReader(IndexReader reader, int docBase) throws IOException { | |||
fieldData = (NumericFieldData) fieldDataCache.cache(fieldDataType, reader, indexFieldName); | |||
} | |||
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@Override public Facet facet() { | |||
return new InternalHistogramFacet(facetName, fieldName, fieldName, interval, comparatorType, histoProc.counts(), histoProc.totals()); | |||
} | |||
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public static long bucket(double value, long interval) { | |||
return (((long) (value / interval)) * interval); | |||
} | |||
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public static class HistogramProc implements NumericFieldData.DoubleValueInDocProc { | |||
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private final long interval; | |||
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private final SearchScript valueScript; | |||
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private final TLongLongHashMap counts = new TLongLongHashMap(); | |||
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private final TLongDoubleHashMap totals = new TLongDoubleHashMap(); | |||
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public HistogramProc(long interval, SearchScript valueScript) { | |||
this.interval = interval; | |||
this.valueScript = valueScript; | |||
} | |||
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@Override public void onValue(int docId, double value) { | |||
long bucket = bucket(value, interval); | |||
counts.adjustOrPutValue(bucket, 1, 1); | |||
double scriptValue = ((Number) valueScript.execute(docId)).doubleValue(); | |||
totals.adjustOrPutValue(bucket, scriptValue, scriptValue); | |||
} | |||
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public TLongLongHashMap counts() { | |||
return counts; | |||
} | |||
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public TLongDoubleHashMap totals() { | |||
return totals; | |||
} | |||
} | |||
} |
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