external/storm-kafka/src/jvm/storm/kafka/StringMultiSchemeWithTopic.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 storm.kafka;

import backtype.storm.spout.MultiScheme;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import sun.reflect.generics.reflectiveObjects.NotImplementedException;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.List;

public class StringMultiSchemeWithTopic
        implements MultiScheme {
    public static final String STRING_SCHEME_KEY = "str";

    public static final String TOPIC_KEY = "topic";

    @Override
    public Iterable<List<Object>> deserialize(ByteBuffer bytes) {
        throw new NotImplementedException();
    }

    public Iterable<List<Object>> deserializeWithTopic(String topic, ByteBuffer bytes) {
        List<Object> items = new Values(StringScheme.deserializeString(bytes), topic);
        return Collections.singletonList(items);
    }

    public Fields getOutputFields() {
        return new Fields(STRING_SCHEME_KEY, TOPIC_KEY);
    }
}