/**
 * 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.hadoop.hdfs.profiling;

import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.fs.FSClientReadProfilingData;

public class DFSReadProfilingData {
  
  private final List<FSClientReadProfilingData> clientProfilingDataList;
  
  public DFSReadProfilingData() {
    this.clientProfilingDataList = new ArrayList<FSClientReadProfilingData>();
  }
  
  public void addDFSClientReadProfilingData(FSClientReadProfilingData cliData) {
    this.clientProfilingDataList.add(cliData);
  }
  
  public List<FSClientReadProfilingData> getClientProfilingDataList() {
    return clientProfilingDataList;
  }
  
  public int numProfiledReplicas() {
    return clientProfilingDataList.size();
  }
  
  public String toString() {
    if (clientProfilingDataList.size() == 0) {
      return "Empty.";
    }
    
    StringBuilder sb = new StringBuilder();
    sb.append("Read from ").append(clientProfilingDataList.size()).append(" block replicas: ");
    
    int i = 0;
    for (FSClientReadProfilingData cliData : clientProfilingDataList) {
      sb.append("\nBlock ").append(++i);
      sb.append("\n").append(cliData.toString());
      sb.append("\n\n");
    }
    
    return sb.toString();
  }
}