content: /*
   * Copyright (c) 2013. wyouflf (wyouflf@gmail.com)
   *
   * 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.lidroid.xutils.http.callback;
  
  import com.lidroid.xutils.util.IOUtils;
  import com.lidroid.xutils.util.OtherUtils;
  import org.apache.http.HttpEntity;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  
  public class StringDownloadHandler {
  
      public String handleEntity(HttpEntity entity, RequestCallBackHandler callBackHandler, String charset) throws IOException {
          if (entity == null) return null;
  
          long current = 0;
          long total = entity.getContentLength();
  
          if (callBackHandler != null && !callBackHandler.updateProgress(total, current, true)) {
              return null;
          }
  
          InputStream inputStream = null;
          StringBuilder sb = new StringBuilder();
          try {
              inputStream = entity.getContent();
              BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, charset));
              String line = "";
              while ((line = reader.readLine()) != null) {
                  sb.append(line).append('\n');
                  current += OtherUtils.sizeOfString(line, charset);
                  if (callBackHandler != null) {
                      if (!callBackHandler.updateProgress(total, current, false)) {
                          break;
                      }
                  }
              }
              if (callBackHandler != null) {
                  callBackHandler.updateProgress(total, current, true);
              }
          } finally {
              IOUtils.closeQuietly(inputStream);
          }
          return sb.toString().trim();
      }
  
  }
  