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 storm.trident.operation.builtin;
  
  import storm.trident.operation.BaseFilter;
  import storm.trident.tuple.TridentTuple;
  
  import java.util.Date;
  
  /**
   * Filter for debugging purposes. The `isKeep()` method simply prints the tuple to `System.out` and returns `true`.
   */
  public class Debug extends BaseFilter {
      private final String name;
  
      public Debug() {
          name = "DEBUG: ";
      }
  
      /**
       * Creates a `Debug` filter with a string identifier.
       * @param name
       */
      public Debug(String name) {
          this.name = "DEBUG(" + name + "): ";
      }
  
      @Override
      public boolean isKeep(TridentTuple tuple) {
          System.out.println("<"+new Date()+"> "+name + tuple.toString());
          return true;
      }
  }
  