demos/src/main/java/com/datatorrent/demos/rollingtopwords/TwitterStatusWordExtractor.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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 com.datatorrent.demos.rollingtopwords;

import com.datatorrent.api.BaseOperator;
import com.datatorrent.api.DefaultInputPort;
import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.api.Context.OperatorContext;

import java.util.Arrays;
import java.util.HashSet;

/**
 * <p>TwitterStatusWordExtractor class.</p>
 *
 * @since 0.3.2
 */
public class TwitterStatusWordExtractor extends BaseOperator
{
  public HashSet<String> filterList;

  public final transient DefaultOutputPort<String> output = new DefaultOutputPort<String>();
  public final transient DefaultInputPort<String> input = new DefaultInputPort<String>()
  {
    @Override
    public void process(String text)
    {
      String strs[] = text.split(" ");
      if (strs != null) {
        for (String str : strs) {
          if (str != null && !filterList.contains(str) ) {
            output.emit(str);
          }
        }
      }
    }
  };

  @Override
  public void setup(OperatorContext context)
  {
    this.filterList = new HashSet<String>(Arrays.asList(new String[]{"", " ","I","you","the","a","to","as","he","him","his","her","she","me","can","for","of","and","or","but",
           "this","that","!",",",".",":","#","/","@","be","in","out","was","were","is","am","are","so","no","...","my","de","RT","on","que","la","i","your","it","have","with","?","when",
    "up","just","do","at","&","-","+","*","\\","y","n","like","se","en","te","el","I'm"}));
  }
}