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Apache Solr (module: core)
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.solr.update.processor;
import static org.apache.solr.update.processor.FieldMutatingUpdateProcessor.mutator;
import java.util.Collection;
import org.apache.solr.common.SolrInputField;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
/**
* Base class for processors that want to mutate selected fields to only keep a subset of the
* original values.
*
* @see #pickSubset
* @since 4.0.0
*/
public abstract class FieldValueSubsetUpdateProcessorFactory
extends FieldMutatingUpdateProcessorFactory {
@Override
public final UpdateRequestProcessor getInstance(
SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next) {
return mutator(
getSelector(),
next,
src -> {
if (src.getValueCount() <= 1) return src;
SolrInputField result = new SolrInputField(src.getName());
result.setValue(pickSubset(src.getValues()));
return result;
});
}
/**
* Method subclasses must override to specify which values should be kept. This method will not be
* called unless the collection contains more then one value.
*/
protected abstract Collection pickSubset(Collection values);
}