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.Map;

import org.apache.hadoop.io.Text;
import org.elasticsearch.hadoop.cfg.Settings;

public class MapWritableFieldExtractor extends ConstantFieldExtractor {

    private Text fieldName;

    @SuppressWarnings("rawtypes")
    @Override
    protected String extractField(Object target) {
        if (target instanceof Map) {
            Map map = (Map) target;
            Object w = map.get(fieldName);
            // since keys are likely primitives, just do a toString
            return (w != null ? w.toString() : null);
        }
        return null;
    }

    @Override
    public void setSettings(Settings settings) {
        super.setSettings(settings);
        fieldName = new Text(getFieldName());
    }
}