org.elasticsearch.hadoop.serialization.field.MapWritableFieldExtractor Maven / Gradle / Ivy
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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.hadoop.serialization.field;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.io.Text;
import org.elasticsearch.hadoop.cfg.Settings;
public class MapWritableFieldExtractor extends ConstantFieldExtractor implements FieldExplainer {
private List fieldNames;
@SuppressWarnings("rawtypes")
@Override
protected Object extractField(Object target) {
for (int i = 0; i < fieldNames.size(); i++) {
if (target instanceof Map) {
Map map = (Map) target;
if (map.containsKey(fieldNames.get(i))) {
target = map.get(fieldNames.get(i));
}
else {
return NOT_FOUND;
}
}
else {
return NOT_FOUND;
}
}
return target;
}
@Override
protected void processField(Settings settings, List fldNames) {
fieldNames = new ArrayList(fldNames.size());
for (String string : fldNames) {
fieldNames.add(new Text(string));
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public String toString(Object field) {
if (field instanceof Map) {
return new LinkedHashMap((Map) field).toString();
}
return field.toString();
}
}