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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.common.SolrException.ErrorCode.SERVER_ERROR;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
/**
* An update processor that adds a constant default value to any document being added that does not
* already have a value in the specified field.
*
* In the example configuration below, if a document does not contain a value in the price
*
and/or type
fields, it will be given default values of 0.0
* and/or unknown
(respectively).
*
*
* <processor class="solr.DefaultValueUpdateProcessorFactory">
* <str name="fieldName">price</str>
* <float name="value">0.0</float>
* </processor>
* <processor class="solr.DefaultValueUpdateProcessorFactory">
* <str name="fieldName">type</str>
* <str name="value">unknown</str>
* </processor>
*
*
* @since 4.0.0
*/
public class DefaultValueUpdateProcessorFactory extends AbstractDefaultValueUpdateProcessorFactory {
protected Object defaultValue = null;
@Override
public void init(NamedList args) {
Object obj = args.remove("value");
if (null == obj) {
throw new SolrException(SERVER_ERROR, "'value' init param must be specified and non-null");
} else {
defaultValue = obj;
}
super.init(args);
}
@Override
public UpdateRequestProcessor getInstance(
SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next) {
return new DefaultValueUpdateProcessor(fieldName, next) {
@Override
public Object getDefaultValue() {
return defaultValue;
}
};
}
}