content: /*
   * Copyright (C) 2011 Clearspring Technologies, Inc. 
   *
   * 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.clearspring.analytics.stream;
  
  import java.io.Externalizable;
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  
  import com.clearspring.analytics.util.ListNode2;
  
  public class Counter<T> implements Externalizable {
  
      protected ListNode2<StreamSummary<T>.Bucket> bucketNode;
  
      protected T item;
      protected long count;
      protected long error;
  
      /**
       * For de-serialization
       */
      public Counter() {
      }
  
      public Counter(ListNode2<StreamSummary<T>.Bucket> bucket, T item) {
          this.bucketNode = bucket;
          this.count = 0;
          this.error = 0;
          this.item = item;
      }
  
      public T getItem() {
          return item;
      }
  
      public long getCount() {
          return count;
      }
  
      public long getError() {
          return error;
      }
  
      @Override
      public String toString() {
          return item + ":" + count + ':' + error;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
          item = (T) in.readObject();
          count = in.readLong();
          error = in.readLong();
      }
  
      @Override
      public void writeExternal(ObjectOutput out) throws IOException {
          out.writeObject(item);
          out.writeLong(count);
          out.writeLong(error);
      }
  }
  
  