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.mongodb;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.validation.constraints.NotNull;
  
  import org.apache.apex.malhar.lib.util.PojoUtils;
  import org.apache.apex.malhar.lib.util.PojoUtils.Getter;
  import org.apache.hadoop.classification.InterfaceStability.Evolving;
  
  import com.mongodb.BasicDBObject;
  
  /**
   * Implementation of {@link MongoDBOutputOperator} that saves a POJO in the mongodb database. <br/>
   * <p>
   * @displayName MongoDb Output Operator
   * @category Output
   * @tags database, nosql, pojo, mongodb
   * @since 0.3.5
   */
  @Evolving
  public class MongoDBPOJOOutputOperator extends MongoDBOutputOperator<Object>
  {
    private final transient ArrayList<Getter<Object, Object>> getterValues;
    @NotNull
    private ArrayList<String> keys;
    @NotNull
    private ArrayList<String> expressions;
    private static final Map<String, Class<?>> mapPrimitives = new HashMap<String, Class<?>>();
    private final transient Map<String, String[]> nestedKeys;
    @NotNull
    private transient ArrayList<String> tablenames;
    @NotNull
    private ArrayList<String> fieldTypes;
  
    /*
     * An ArrayList of expressions to get field values from POJO and populate mongodb.
     */
    public ArrayList<String> getExpressions()
    {
      return expressions;
    }
  
    public void setExpressions(ArrayList<String> expressions)
    {
      this.expressions = expressions;
    }
  
    /*
     * ArrayList of Data Types of Keys specified by user in same order as Keys.
     * User needs to specify the java package also for non primitive data types.
     * Example: java.lang.String,int,char,java.lang.Integer,java.util.Map
     */
    public ArrayList<String> getFieldTypes()
    {
      return fieldTypes;
    }
  
    public void setFieldTypes(ArrayList<String> fieldTypes)
    {
      this.fieldTypes = fieldTypes;
    }
  
    /*
     * Keys to be stored in mongodb document.Example: Id,name,address.
     */
    public ArrayList<String> getKeys()
    {
      return keys;
    }
  
    public void setKeys(ArrayList<String> keys)
    {
      this.keys = keys;
    }
  
    /*
     * Fields can be stored in separate tables in the same database.This is the list of tables.
     */
    public ArrayList<String> getTablenames()
    {
      return tablenames;
    }
  
    public void setTablenames(ArrayList<String> tablenames)
    {
      this.tablenames = tablenames;
    }
  
    public MongoDBPOJOOutputOperator()
    {
      super();
      getterValues = new ArrayList<Getter<Object, Object>>();
      nestedKeys = new HashMap<String, String[]>();
    }
  
    static {
      mapPrimitives.put("boolean", boolean.class);
      mapPrimitives.put("char", char.class);
      mapPrimitives.put("short", short.class);
      mapPrimitives.put("int", int.class);
      mapPrimitives.put("long", long.class);
      mapPrimitives.put("float", float.class);
      mapPrimitives.put("double", double.class);
    }
  
    private void processFirstTuple(Object tuple)
    {
      ArrayList<Class<?>> classTypes = new ArrayList<Class<?>>();
      for (String fieldType: fieldTypes) {
        if (mapPrimitives.containsKey(fieldType)) {
          classTypes.add(mapPrimitives.get(fieldType));
        } else {
          try {
            classTypes.add(Class.forName(fieldType));
          } catch (ClassNotFoundException ex) {
            throw new RuntimeException(ex);
          }
        }
      }
      final Class<?> fqcn = tuple.getClass();
      for (int i = 0; i < expressions.size(); i++) {
        final String key = keys.get(i);
        getterValues.add(PojoUtils.createGetter(fqcn, expressions.get(i), classTypes.get(i)));
        if (key.contains(".")) {
          nestedKeys.put(key, key.split("[.]"));
        }
        String table = tablenames.get(i);
        if (!tableList.contains(table)) {
          tableList.add(table);
        }
      }
  
    }
  
    @Override
    public void processTuple(Object tuple)
    {
      tableToDocument.clear();
      BasicDBObject doc;
      BasicDBObject nestedDoc = null;
  
      if (getterValues.isEmpty()) {
        processFirstTuple(tuple);
      }
  
      for (int i = 0; i < keys.size(); i++) {
        String key = keys.get(i);
        String table = tablenames.get(i);
        //nested object are stored in a new document in mongo db.
        if (key.contains(".")) {
          String[] subKeys = nestedKeys.get(key);
          if (nestedDoc == null) {
            nestedDoc = new BasicDBObject();
          }
          nestedDoc.put(subKeys[1], (getterValues.get(i)).get(tuple));
          if ((doc = tableToDocument.get(table)) == null) {
            doc = new BasicDBObject();
          }
          if (doc.containsField(subKeys[0])) {
            doc.append(subKeys[0], nestedDoc);
          } else {
            doc.put(subKeys[0], nestedDoc);
          }
        } else {
          if ((doc = tableToDocument.get(table)) == null) {
            doc = new BasicDBObject();
          }
          doc.put(key, (getterValues.get(i)).get(tuple));
        }
        tableToDocument.put(table, doc);
      }
      processTupleCommon();
  
    }
  
    /*
     *This function is not required in POJO based implementation of MongoDBOutputOperator.
     */
    @Override
    public void setColumnMapping(String[] mapping)
    {
    }
  
  }
  