org.elasticsearch.search.aggregations.support.numeric.ScriptDoubleValues Maven / Gradle / Ivy
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* the Apache License, Version 2.0 (the "License"); you may
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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package org.elasticsearch.search.aggregations.support.numeric;
import org.apache.lucene.util.ArrayUtil;
import org.elasticsearch.index.fielddata.DoubleValues;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.elasticsearch.search.aggregations.support.ScriptValues;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
/**
* {@link DoubleValues} implementation which is based on a script
*/
public class ScriptDoubleValues extends DoubleValues implements ScriptValues {
final SearchScript script;
private Object value;
private double[] values = new double[4];
private int valueCount;
private int valueOffset;
public ScriptDoubleValues(SearchScript script) {
super(true); // assume multi-valued
this.script = script;
}
@Override
public SearchScript script() {
return script;
}
@Override
public int setDocument(int docId) {
this.docId = docId;
script.setNextDocId(docId);
value = script.run();
if (value == null) {
valueCount = 0;
}
else if (value instanceof Number) {
valueCount = 1;
values[0] = ((Number) value).doubleValue();
}
else if (value.getClass().isArray()) {
valueCount = Array.getLength(value);
values = ArrayUtil.grow(values, valueCount);
for (int i = 0; i < valueCount; ++i) {
values[i] = ((Number) Array.get(value, i)).doubleValue();
}
}
else if (value instanceof Collection) {
valueCount = ((Collection) value).size();
int i = 0;
for (Iterator it = ((Collection) value).iterator(); it.hasNext(); ++i) {
values[i] = ((Number) it.next()).doubleValue();
}
assert i == valueCount;
}
else {
throw new AggregationExecutionException("Unsupported script value [" + value + "]");
}
valueOffset = 0;
return valueCount;
}
@Override
public double nextValue() {
assert valueOffset < valueCount;
return values[valueOffset++];
}
}