content: /**
   * 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.apex.malhar.contrib.couchdb;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.codehaus.jackson.map.ObjectMapper;
  import org.ektorp.ViewResult;
  
  /**
   * A base CouchDb input adaptor that emits a map. <br/>
   * <p>
   * This adaptor coverts the result of a database view to a map and emits it.<br/>
   * It uses the emitTuples implementation of {@link AbstractCouchDBInputOperator} which emits the complete result
   * of the ViewQuery every window cycle.
   * @displayName Abstract Map Based Input
   * @category Input
   * @tags input operator
   * @since 0.3.5
   */
  public abstract class AbstractMapBasedInputOperator extends AbstractCouchDBInputOperator<Map<Object, Object>>
  {
    private transient ObjectMapper mapper;
  
    public AbstractMapBasedInputOperator()
    {
      mapper = new ObjectMapper();
    }
  
    @Override
    @SuppressWarnings("unchecked")
    public Map<Object, Object> getTuple(ViewResult.Row value) throws IOException
    {
      return mapper.readValue(value.getValueAsNode(), HashMap.class);
    }
  }
  