/*
* 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.SortedBinaryDocValues;
import org.elasticsearch.index.fielddata.SortingBinaryDocValues;
import org.elasticsearch.script.LeafSearchScript;
import java.io.IOException;
import java.lang.reflect.Array;
import java.util.Collection;
/**
* {@link SortedBinaryDocValues} implementation that reads values from a script.
*/
public class ScriptBytesValues extends SortingBinaryDocValues implements ScorerAware {
private final LeafSearchScript script;
public ScriptBytesValues(LeafSearchScript script) {
super();
this.script = script;
}
private void set(int i, Object o) {
if (o == null) {
values[i].clear();
} else {
values[i].copyChars(o.toString());
}
}
@Override
public boolean advanceExact(int doc) throws IOException {
script.setDocument(doc);
final Object value = script.run();
if (value == null) {
return false;
} else if (value.getClass().isArray()) {
count = Array.getLength(value);
if (count == 0) {
return false;
}
grow();
for (int i = 0; i < count; ++i) {
set(i, Array.get(value, i));
}
} else if (value instanceof Collection) {
final Collection<?> coll = (Collection<?>) value;
count = coll.size();
if (count == 0) {
return false;
}
grow();
int i = 0;
for (Object v : coll) {
set(i++, v);
}
} else {
count = 1;
set(0, value);
}
sort();
return true;
}
@Override
public void setScorer(Scorer scorer) {
script.setScorer(scorer);
}
}