external/storm-kafka/src/jvm/storm/kafka/KeyValueSchemeAsMultiScheme.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.SchemeAsMultiScheme;

import java.util.Arrays;
import java.util.List;

public class KeyValueSchemeAsMultiScheme extends SchemeAsMultiScheme{

    public KeyValueSchemeAsMultiScheme(KeyValueScheme scheme) {
        super(scheme);
    }

    public Iterable<List<Object>> deserializeKeyAndValue(final byte[] key, final byte[] value) {
        List<Object> o = ((KeyValueScheme)scheme).deserializeKeyAndValue(key, value);
        if(o == null) return null;
        else return Arrays.asList(o);
    }

}