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/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.
*/
package org.elasticsearch.search.facet.termsstats;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.IndexNumericFieldData;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.core.NumberFieldMapper;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.facet.FacetExecutor;
import org.elasticsearch.search.facet.FacetParser;
import org.elasticsearch.search.facet.FacetPhaseExecutionException;
import org.elasticsearch.search.facet.termsstats.doubles.TermsStatsDoubleFacetExecutor;
import org.elasticsearch.search.facet.termsstats.longs.TermsStatsLongFacetExecutor;
import org.elasticsearch.search.facet.termsstats.strings.TermsStatsStringFacetExecutor;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Map;
public class TermsStatsFacetParser extends AbstractComponent implements FacetParser {
@Inject
public TermsStatsFacetParser(Settings settings) {
super(settings);
InternalTermsStatsFacet.registerStreams();
}
@Override
public String[] types() {
return new String[]{TermsStatsFacet.TYPE, "termsStats"};
}
@Override
public FacetExecutor.Mode defaultMainMode() {
return FacetExecutor.Mode.COLLECTOR;
}
@Override
public FacetExecutor.Mode defaultGlobalMode() {
return FacetExecutor.Mode.COLLECTOR;
}
@Override
public FacetExecutor parse(String facetName, XContentParser parser, SearchContext context) throws IOException {
String keyField = null;
String valueField = null;
int size = 10;
TermsStatsFacet.ComparatorType comparatorType = TermsStatsFacet.ComparatorType.COUNT;
String scriptLang = null;
String script = null;
Map params = null;
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if ("params".equals(currentFieldName)) {
params = parser.map();
}
} else if (token.isValue()) {
if ("key_field".equals(currentFieldName) || "keyField".equals(currentFieldName)) {
keyField = parser.text();
} else if ("value_field".equals(currentFieldName) || "valueField".equals(currentFieldName)) {
valueField = parser.text();
} else if ("script_field".equals(currentFieldName)) {
script = parser.text();
} else if ("value_script".equals(currentFieldName)) {
script = parser.text();
} else if ("size".equals(currentFieldName)) {
size = parser.intValue();
} else if ("all_terms".equals(currentFieldName) || "allTerms".equals(currentFieldName)) {
if (parser.booleanValue()) {
size = 0; // indicates all terms
}
} else if ("order".equals(currentFieldName) || "comparator".equals(currentFieldName)) {
comparatorType = TermsStatsFacet.ComparatorType.fromString(parser.text());
} else if ("value_script".equals(currentFieldName)) {
script = parser.text();
} else if ("lang".equals(currentFieldName)) {
scriptLang = parser.text();
}
}
}
if (keyField == null) {
throw new FacetPhaseExecutionException(facetName, "[key_field] is required to be set for terms stats facet");
}
if (valueField == null && script == null) {
throw new FacetPhaseExecutionException(facetName, "either [value_field] or [script] are required to be set for terms stats facet");
}
FieldMapper keyMapper = context.smartNameFieldMapper(keyField);
if (keyMapper == null) {
throw new FacetPhaseExecutionException(facetName, "failed to find mapping for " + keyField);
}
IndexFieldData keyIndexFieldData = context.fieldData().getForField(keyMapper);
IndexNumericFieldData valueIndexFieldData = null;
SearchScript valueScript = null;
if (valueField != null) {
FieldMapper fieldMapper = context.smartNameFieldMapper(valueField);
if (!(fieldMapper instanceof NumberFieldMapper)) {
throw new FacetPhaseExecutionException(facetName, "value_field [" + valueField + "] isn't a number field, but a " + fieldMapper.fieldDataType().getType());
}
valueIndexFieldData = context.fieldData().getForField(fieldMapper);
} else {
valueScript = context.scriptService().search(context.lookup(), scriptLang, script, params);
}
if (keyIndexFieldData instanceof IndexNumericFieldData) {
IndexNumericFieldData keyIndexNumericFieldData = (IndexNumericFieldData) keyIndexFieldData;
if (keyIndexNumericFieldData.getNumericType().isFloatingPoint()) {
return new TermsStatsDoubleFacetExecutor(keyIndexNumericFieldData, valueIndexFieldData, valueScript, size, comparatorType, context);
} else {
return new TermsStatsLongFacetExecutor(keyIndexNumericFieldData, valueIndexFieldData, valueScript, size, comparatorType, context);
}
}
return new TermsStatsStringFacetExecutor(keyIndexFieldData, valueIndexFieldData, valueScript, size, comparatorType, context);
}
}
