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 com.cloud.storage.template;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  
  
  import com.cloud.storage.StorageLayer;
  
  public class LocalTemplateDownloader extends TemplateDownloaderBase implements TemplateDownloader {
  
      public LocalTemplateDownloader(StorageLayer storageLayer, String downloadUrl, String toDir, long maxTemplateSizeInBytes, DownloadCompleteCallback callback) {
          super(storageLayer, downloadUrl, toDir, maxTemplateSizeInBytes, callback);
          String filename = new File(downloadUrl).getName();
          _toFile = toDir.endsWith(File.separator) ? (toDir + filename) : (toDir + File.separator + filename);
      }
  
      @Override
      public long download(boolean resume, DownloadCompleteCallback callback) {
          if (_status == Status.ABORTED || _status == Status.UNRECOVERABLE_ERROR || _status == Status.DOWNLOAD_FINISHED) {
              return 0;
          }
  
          _start = System.currentTimeMillis();
          _resume = resume;
  
          File src;
          try {
              src = new File(new URI(_downloadUrl));
          } catch (URISyntaxException e1) {
              logger.warn("Invalid URI " + _downloadUrl);
              _status = Status.UNRECOVERABLE_ERROR;
              return 0;
          }
          File dst = new File(_toFile);
  
          FileChannel fic = null;
          FileChannel foc = null;
          FileInputStream fis = null;
          FileOutputStream fos = null;
  
          try {
              if (_storage != null) {
                  dst.createNewFile();
                  _storage.setWorldReadableAndWriteable(dst);
              }
  
              ByteBuffer buffer = ByteBuffer.allocate(1024 * 512);
  
              try {
                  fis = new FileInputStream(src);
              } catch (FileNotFoundException e) {
                  logger.warn("Unable to find " + _downloadUrl);
                  _errorString = "Unable to find " + _downloadUrl;
                  return -1;
              }
              fic = fis.getChannel();
              try {
                  fos = new FileOutputStream(dst);
              } catch (FileNotFoundException e) {
                  logger.warn("Unable to find " + _toFile);
                  return -1;
              }
              foc = fos.getChannel();
  
              _remoteSize = src.length();
              _totalBytes = 0;
              _status = TemplateDownloader.Status.IN_PROGRESS;
  
              try {
                  while (_status != Status.ABORTED && fic.read(buffer) != -1) {
                      buffer.flip();
                      int count = foc.write(buffer);
                      _totalBytes += count;
                      buffer.clear();
                  }
              } catch (IOException e) {
                  logger.warn("Unable to download", e);
              }
  
              String downloaded = "(incomplete download)";
              if (_totalBytes == _remoteSize) {
                  _status = TemplateDownloader.Status.DOWNLOAD_FINISHED;
                  downloaded = "(download complete)";
              }
  
              _errorString = "Downloaded " + _remoteSize + " bytes " + downloaded;
              _downloadTime += System.currentTimeMillis() - _start;
              return _totalBytes;
          } catch (Exception e) {
              _status = TemplateDownloader.Status.UNRECOVERABLE_ERROR;
              _errorString = e.getMessage();
              return 0;
          } finally {
              if (fic != null) {
                  try {
                      fic.close();
                  } catch (IOException e) {
                      logger.info("[ignore] error while closing file input channel.");
                  }
              }
  
              if (foc != null) {
                  try {
                      foc.close();
                  } catch (IOException e) {
                      logger.info("[ignore] error while closing file output channel.");
                  }
              }
  
              if (fis != null) {
                  try {
                      fis.close();
                  } catch (IOException e) {
                      logger.info("[ignore] error while closing file input stream.");
                  }
              }
  
              if (fos != null) {
                  try {
                      fos.close();
                  } catch (IOException e) {
                      logger.info("[ignore] error while closing file output stream.");
                  }
              }
  
              if (_status == Status.UNRECOVERABLE_ERROR && dst.exists()) {
                  dst.delete();
              }
              if (callback != null) {
                  callback.downloadComplete(_status);
              }
          }
      }
  }
  