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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.elasticsearch.common.lucene.ScorerAware;
import org.elasticsearch.index.fielddata.SortingNumericDoubleValues;
import org.elasticsearch.script.LeafSearchScript;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.joda.time.ReadableInstant;
import java.io.IOException;
import java.lang.reflect.Array;
import java.util.Collection;
/**
* {@link SortingNumericDoubleValues} implementation which is based on a script
*/
public class ScriptDoubleValues extends SortingNumericDoubleValues implements ScorerAware {
final LeafSearchScript script;
public ScriptDoubleValues(LeafSearchScript script) {
super();
this.script = script;
}
@Override
public boolean advanceExact(int target) throws IOException {
script.setDocument(target);
final Object value = script.run();
if (value == null) {
return false;
} else if (value instanceof Number) {
resize(1);
values[0] = ((Number) value).doubleValue();
} else if (value instanceof ReadableInstant) {
resize(1);
values[0] = ((ReadableInstant) value).getMillis();
} else if (value.getClass().isArray()) {
int length = Array.getLength(value);
if (length == 0) {
return false;
}
resize(length);
for (int i = 0; i < length; ++i) {
values[i] = toDoubleValue(Array.get(value, i));
}
} else if (value instanceof Collection) {
Collection<?> coll = (Collection<?>) value;
if (coll.isEmpty()) {
return false;
}
resize(coll.size());
int i = 0;
for (Object v : coll) {
values[i++] = toDoubleValue(v);
}
assert i == docValueCount();
} else {
resize(1);
values[0] = toDoubleValue(value);
}
sort();
return true;
}
private static double toDoubleValue(Object o) {
if (o instanceof Number) {
return ((Number) o).doubleValue();
} else if (o instanceof ReadableInstant) {
// Dates are exposed in scripts as ReadableDateTimes but aggregations want them to be numeric
return ((ReadableInstant) o).getMillis();
} 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() ? 1.0 : 0.0;
} else {
throw new AggregationExecutionException("Unsupported script value [" + o + "], expected a number, date, or boolean");
}
}
@Override
public void setScorer(Scorer scorer) {
script.setScorer(scorer);
}
}