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Elasticsearch Hadoop Cascading

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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.cascading;

import java.util.List;

import org.elasticsearch.hadoop.serialization.field.ConstantFieldExtractor;
import org.elasticsearch.hadoop.serialization.field.FieldExplainer;

import cascading.scheme.SinkCall;

public class CascadingFieldExtractor extends ConstantFieldExtractor implements FieldExplainer {

    @SuppressWarnings({ "rawtypes" })
    @Override
    protected Object extractField(Object target) {
        List fieldNames = getFieldNames();
        for (int i = 0; i < fieldNames.size(); i++) {
            if (target instanceof SinkCall) {
                target = ((SinkCall) target).getOutgoingEntry().getObject(fieldNames.get(i));
                if (target == null) {
                    return NOT_FOUND;
                }
            }
            else {
                return NOT_FOUND;
            }
        }
        return target;
    }

    @Override
    public String toString(Object field) {
        if (field instanceof SinkCall) {
            return ((SinkCall) field).getOutgoingEntry().toString();
        }
        return field.toString();
    }
}