| /* |
| * 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.SolrException; |
| import org.apache.solr.common.SolrException.ErrorCode; |
| import org.apache.solr.common.util.NamedList; |
| import org.apache.solr.core.SolrCore; |
| import org.apache.solr.request.SolrQueryRequest; |
| import org.apache.solr.response.SolrQueryResponse; |
| import org.apache.solr.update.processor.FieldMutatingUpdateProcessor.FieldNameSelector; |
| |
| import static org.apache.solr.update.processor.FieldMutatingUpdateProcessor.SELECT_NO_FIELDS; |
| import static org.apache.solr.update.processor.FieldValueMutatingUpdateProcessor.valueMutator; |
| |
| /** |
| * Truncates any CharSequence values found in fields matching the specified |
| * conditions to a maximum character length. |
| * <p> |
| * By default this processor matches no fields |
| * </p> |
| * |
| * <p>For example, with the configuration listed below any documents |
| * containing a String in any field declared in the schema using |
| * <code>StrField</code> will be truncated to no more then 100 characters |
| * </p> |
| * <pre class="prettyprint"> |
| * <processor class="solr.TruncateFieldUpdateProcessorFactory"> |
| * <str name="typeClass">solr.StrField</str> |
| * <int name="maxLength">100</int> |
| * </processor></pre> |
| * @since 4.0.0 |
| */ |
| public final class TruncateFieldUpdateProcessorFactory |
| extends FieldMutatingUpdateProcessorFactory { |
| |
| private static final String MAX_LENGTH_PARAM = "maxLength"; |
| |
| private int maxLength = 0; |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public void init(@SuppressWarnings({"rawtypes"})NamedList args) { |
| |
| Object lengthParam = args.remove(MAX_LENGTH_PARAM); |
| if (null == lengthParam) { |
| throw new SolrException(ErrorCode.SERVER_ERROR, |
| "Missing required init parameter: " + |
| MAX_LENGTH_PARAM); |
| } |
| if ( ! (lengthParam instanceof Number) ) { |
| throw new SolrException(ErrorCode.SERVER_ERROR, |
| "Init param " + MAX_LENGTH_PARAM + |
| "must be a number; found: \"" + |
| lengthParam.toString()); |
| } |
| maxLength = ((Number)lengthParam).intValue(); |
| if (maxLength < 0) { |
| throw new SolrException(ErrorCode.SERVER_ERROR, |
| "Init param " + MAX_LENGTH_PARAM + |
| "must be >= 0; found: " + maxLength); |
| } |
| |
| super.init(args); |
| } |
| |
| @Override |
| public FieldNameSelector getDefaultSelector(final SolrCore core) { |
| return SELECT_NO_FIELDS; |
| } |
| |
| @Override |
| public UpdateRequestProcessor getInstance(SolrQueryRequest req, |
| SolrQueryResponse rsp, |
| UpdateRequestProcessor next) { |
| return valueMutator(getSelector(), next, src -> { |
| if (src instanceof CharSequence) { |
| CharSequence s = (CharSequence) src; |
| if (maxLength < s.length()) { |
| return s.subSequence(0, maxLength); |
| } |
| } |
| return src; |
| }); |
| } |
| } |
| |