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/*
* Licensed to Elasticsearch 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.script;
import org.apache.lucene.search.Scorer;
import org.elasticsearch.index.fielddata.ScriptDocValues;
import org.elasticsearch.search.lookup.LeafDocLookup;
import org.elasticsearch.search.lookup.LeafFieldsLookup;
import org.elasticsearch.search.lookup.LeafIndexLookup;
import org.elasticsearch.search.lookup.LeafSearchLookup;
import org.elasticsearch.search.lookup.SourceLookup;
import java.io.IOException;
import java.util.Map;
/**
* A base class for any script type that is used during the search process (custom score, aggs, and so on).
* <p>
* If the script returns a specific numeric type, consider overriding the type specific base classes
* such as {@link AbstractDoubleSearchScript}, {@link AbstractFloatSearchScript} and {@link AbstractLongSearchScript}
* for better performance.
* <p>
* The use is required to implement the {@link #run()} method.
*/
public abstract class AbstractSearchScript extends AbstractExecutableScript implements LeafSearchScript {
private LeafSearchLookup lookup;
private Scorer scorer;
/**
* Returns the doc lookup allowing to access field data (cached) values as well as the current document score
* (where applicable).
*/
protected final LeafDocLookup doc() {
return lookup.doc();
}
/**
* Returns the current score and only applicable when used as a scoring script in a custom score query!.
*/
protected final float score() throws IOException {
return scorer.score();
}
/**
* Returns field data strings access for the provided field.
*/
protected ScriptDocValues.Strings docFieldStrings(String field) {
return (ScriptDocValues.Strings) doc().get(field);
}
/**
* Returns field data double (floating point) access for the provided field.
*/
protected ScriptDocValues.Doubles docFieldDoubles(String field) {
return (ScriptDocValues.Doubles) doc().get(field);
}
/**
* Returns field data long (integers) access for the provided field.
*/
protected ScriptDocValues.Longs docFieldLongs(String field) {
return (ScriptDocValues.Longs) doc().get(field);
}
/**
* Allows to access the actual source (loaded and parsed).
*/
protected final SourceLookup source() {
return lookup.source();
}
/**
* Allows to access statistics on terms and fields.
*/
protected final LeafIndexLookup indexLookup() {
return lookup.indexLookup();
}
/**
* Allows to access the *stored* fields.
*/
protected final LeafFieldsLookup fields() {
return lookup.fields();
}
void setLookup(LeafSearchLookup lookup) {
this.lookup = lookup;
}
@Override
public void setScorer(Scorer scorer) {
this.scorer = scorer;
}
@Override
public void setDocument(int doc) {
lookup.setDocument(doc);
}
@Override
public void setSource(Map<String, Object> source) {
lookup.source().setSource(source);
}
@Override
public float runAsFloat() {
return ((Number) run()).floatValue();
}
@Override
public long runAsLong() {
return ((Number) run()).longValue();
}
@Override
public double runAsDouble() {
return ((Number) run()).doubleValue();
}
}
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