/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.ingest.common;
import org.elasticsearch.ingest.AbstractProcessor;
import org.elasticsearch.ingest.ConfigurationUtils;
import org.elasticsearch.ingest.IngestDocument;
import org.elasticsearch.ingest.Processor;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
* Processor that joins the different items of an array into a single string value using a separator between each item.
* Throws exception is the specified field is not an array.
*/
public final class JoinProcessor extends AbstractProcessor {
public static final String TYPE = "join";
private final String field;
private final String separator;
JoinProcessor(String tag, String field, String separator) {
super(tag);
this.field = field;
this.separator = separator;
}
String getField() {
return field;
}
String getSeparator() {
return separator;
}
@Override
public void execute(IngestDocument document) {
List<?> list = document.getFieldValue(field, List.class);
if (list == null) {
throw new IllegalArgumentException("field [" + field + "] is null, cannot join.");
}
String joined = list.stream()
.map(Object::toString)
.collect(Collectors.joining(separator));
document.setFieldValue(field, joined);
}
@Override
public String getType() {
return TYPE;
}
public static final class Factory implements Processor.Factory {
@Override
public JoinProcessor create(Map<String, Processor.Factory> registry, String processorTag,
Map<String, Object> config) throws Exception {
String field = ConfigurationUtils.readStringProperty(TYPE, processorTag, config, "field");
String separator = ConfigurationUtils.readStringProperty(TYPE, processorTag, config, "separator");
return new JoinProcessor(processorTag, field, separator);
}
}
}