| /* |
| * 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 org.apache.solr.common.util.NamedList; |
| import org.apache.solr.request.SolrQueryRequest; |
| import org.apache.solr.response.SolrQueryResponse; |
| |
| import static org.apache.solr.update.processor.FieldValueMutatingUpdateProcessor.DELETE_VALUE_SINGLETON; |
| import static org.apache.solr.update.processor.FieldValueMutatingUpdateProcessor.valueMutator; |
| |
| /** |
| * Removes any values found which are CharSequence with a length of 0. |
| * (ie: empty strings) |
| * <p> |
| * By default this processor applies itself to all fields. |
| * </p> |
| * |
| * <p> |
| * For example, with the configuration listed below, blank strings will be |
| * removed from all fields except those whose name ends with |
| * "<code>_literal</code>". |
| * </p> |
| * |
| * <pre class="prettyprint"> |
| * <processor class="solr.RemoveBlankFieldUpdateProcessorFactory"> |
| * <lst name="exclude"> |
| * <str name="fieldRegex">.*_literal</str> |
| * </lst> |
| * </processor></pre> |
| * |
| * @since 4.0.0 |
| */ |
| public final class RemoveBlankFieldUpdateProcessorFactory extends FieldMutatingUpdateProcessorFactory { |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public void init(@SuppressWarnings({"rawtypes"})NamedList args) { |
| // no trim specific init args |
| super.init(args); |
| } |
| |
| @Override |
| public UpdateRequestProcessor getInstance(SolrQueryRequest req, |
| SolrQueryResponse rsp, |
| UpdateRequestProcessor next) { |
| return valueMutator(getSelector(), next, src -> { |
| if (src instanceof CharSequence |
| && 0 == ((CharSequence) src).length()) { |
| return DELETE_VALUE_SINGLETON; |
| } |
| return src; |
| }); |
| } |
| } |
| |