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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.response.transform;
import org.apache.solr.common.SolrDocument;
/**
* Return a field with a name that is different that what is indexed
*
* @since solr 4.0
*/
public class RenameFieldTransformer extends DocTransformer {
final String from;
final String to;
final boolean copy;
final String[] ensureFromFieldPresent;
public RenameFieldTransformer(String from, String to, boolean copy) {
this.from = from;
this.to = to;
this.copy = copy;
this.ensureFromFieldPresent = new String[] {from};
assert !from.equals(to);
}
@Override
public String getName() {
return "Rename[" + from + ">>" + to + "]";
}
@Override
public void transform(SolrDocument doc, int docid) {
Object v = (copy) ? doc.get(from) : doc.remove(from);
if (v != null) {
doc.setField(to, v);
}
}
@Override
public String[] getExtraRequestFields() {
return ensureFromFieldPresent;
}
}