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/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.script.expression;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.DoubleValues;
import org.opensearch.index.fielddata.IndexFieldData;
import org.opensearch.index.fielddata.LeafNumericFieldData;
import org.opensearch.index.fielddata.SortedNumericDoubleValues;
import java.io.IOException;
/**
* ValueSource to return non-zero if a field is missing.
*
* This is essentially sugar over !count()
*/
final class EmptyMemberValueSource extends FieldDataBasedDoubleValuesSource {
EmptyMemberValueSource(IndexFieldData fieldData) {
super(fieldData);
}
@Override
public DoubleValues getValues(LeafReaderContext leaf, DoubleValues scores) {
LeafNumericFieldData leafData = (LeafNumericFieldData) fieldData.load(leaf);
final SortedNumericDoubleValues values = leafData.getDoubleValues();
return DoubleValues.withDefault(new DoubleValues() {
@Override
public double doubleValue() {
return 0;
}
@Override
public boolean advanceExact(int doc) throws IOException {
return values.advanceExact(doc);
}
}, 1);
}
@Override
public int hashCode() {
return 31 * getClass().hashCode() + fieldData.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
EmptyMemberValueSource other = (EmptyMemberValueSource) obj;
return fieldData.equals(other.fieldData);
}
@Override
public String toString() {
return "empty: field(" + fieldData.getFieldName() + ")";
}
}