storm-compatibility/src/java/org/apache/storm/spout/SchemeAsMultiScheme.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 org.apache.storm.spout;

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

import org.apache.storm.tuple.Fields;

public class SchemeAsMultiScheme implements MultiScheme {
  private static final long serialVersionUID = 6575013093104910887L;
  public final Scheme scheme;

  public SchemeAsMultiScheme(Scheme scheme) {
    this.scheme = scheme;
  }

  @Override
  public Iterable<List<Object>> deserialize(final ByteBuffer ser) {
    List<Object> o = scheme.deserialize(ser);
    if (o == null) {
      return null;
    } else {
      return Arrays.asList(o);
    }
  }

  @Override
  public Fields getOutputFields() {
    return scheme.getOutputFields();
  }
}