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/*
* 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.processor;
import org.elasticsearch.ingest.core.AbstractProcessor;
import org.elasticsearch.ingest.core.AbstractProcessorFactory;
import org.elasticsearch.ingest.core.ConfigurationUtils;
import org.elasticsearch.ingest.core.IngestDocument;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* Processor that replaces dots in document field names with a
* specified separator.
*/
public class DeDotProcessor extends AbstractProcessor {
public static final String TYPE = "dedot";
static final String DEFAULT_SEPARATOR = "_";
private final String separator;
DeDotProcessor(String tag, String separator) {
super(tag);
this.separator = separator;
}
public String getSeparator() {
return separator;
}
@Override
public void execute(IngestDocument document) {
deDot(document.getSourceAndMetadata());
}
@Override
public String getType() {
return TYPE;
}
/**
* Recursively iterates through Maps and Lists in search of map entries with
* keys containing dots. The dots in these fields are replaced with {@link #separator}.
*
* @param obj The current object in context to be checked for dots in its fields.
*/
private void deDot(Object obj) {
if (obj instanceof Map) {
@SuppressWarnings("unchecked")
Map<String, Object> doc = (Map) obj;
Iterator<Map.Entry<String, Object>> it = doc.entrySet().iterator();
Map<String, Object> deDottedFields = new HashMap<>();
while (it.hasNext()) {
Map.Entry<String, Object> entry = it.next();
deDot(entry.getValue());
String fieldName = entry.getKey();
if (fieldName.contains(".")) {
String deDottedFieldName = fieldName.replaceAll("\\.", separator);
deDottedFields.put(deDottedFieldName, entry.getValue());
it.remove();
}
}
doc.putAll(deDottedFields);
} else if (obj instanceof List) {
@SuppressWarnings("unchecked")
List<Object> list = (List) obj;
for (Object value : list) {
deDot(value);
}
}
}
public static class Factory extends AbstractProcessorFactory<DeDotProcessor> {
@Override
public DeDotProcessor doCreate(String processorTag, Map<String, Object> config) throws Exception {
String separator = ConfigurationUtils.readOptionalStringProperty(TYPE, processorTag, config, "separator");
if (separator == null) {
separator = DEFAULT_SEPARATOR;
}
return new DeDotProcessor(processorTag, separator);
}
}
}
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