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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.search.aggregations.support.values;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.util.LongValues;
import org.elasticsearch.common.lucene.ScorerAware;
import org.elasticsearch.index.fielddata.SortingNumericDocValues;
import org.elasticsearch.script.LeafSearchScript;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
/**
* {@link LongValues} implementation which is based on a script
*/
public class ScriptLongValues extends SortingNumericDocValues implements ScorerAware {
final LeafSearchScript script;
public ScriptLongValues(LeafSearchScript script) {
super();
this.script = script;
}
@Override
public void setDocument(int docId) {
script.setDocument(docId);
final Object value = script.run();
if (value == null) {
resize(0);
}
else if (value.getClass().isArray()) {
resize(Array.getLength(value));
for (int i = 0; i < count(); ++i) {
values[i] = toLongValue(Array.get(value, i));
}
}
else if (value instanceof Collection) {
resize(((Collection) value).size());
int i = 0;
for (Iterator it = ((Collection) value).iterator(); it.hasNext(); ++i) {
values[i] = toLongValue(it.next());
}
assert i == count();
}
else {
resize(1);
values[0] = toLongValue(value);
}
sort();
}
private static long toLongValue(Object o) {
if (o instanceof Number) {
return ((Number) o).longValue();
} else if (o instanceof Boolean) {
// We do expose boolean fields as boolean in scripts, however aggregations still expect
// that scripts return the same internal representation as regular fields, so boolean
// values in scripts need to be converted to a number, and the value formatter will
// make sure of using true/false in the key_as_string field
return ((Boolean) o).booleanValue() ? 1L : 0L;
} else {
throw new AggregationExecutionException("Unsupported script value [" + o + "], expected a number");
}
}
@Override
public void setScorer(Scorer scorer) {
script.setScorer(scorer);
}
}