/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.common.content;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  import java.net.URLConnection;
  
  import javax.xml.transform.Source;
  import javax.xml.transform.stream.StreamSource;
  
  import org.apache.commons.io.FilenameUtils;
  import org.xml.sax.InputSource;
  
  /**
   * @author Thomas Scheffler (yagee)
   *
   */
  public class MCRURLContent extends MCRContent {
  
      private URL url;
  
      public MCRURLContent(URL url) {
          super();
          this.url = url;
          this.setSystemId(url.toString());
          String fileName = url.getPath();
          if (fileName.endsWith("/")) {
              fileName = FilenameUtils.getPathNoEndSeparator(fileName); //removes final '/';
          }
          setName(FilenameUtils.getName(fileName));
      }
  
      @Override
      public InputStream getInputStream() throws IOException {
          return url.openStream();
      }
  
      @Override
      public Source getSource() throws IOException {
          return new StreamSource(getSystemId());
      }
  
      @Override
      public InputSource getInputSource() throws IOException {
          return new InputSource(getSystemId());
      }
  
      @Override
      public long length() throws IOException {
          return url.openConnection().getContentLengthLong();
      }
  
      @Override
      public long lastModified() throws IOException {
          return url.openConnection().getLastModified();
      }
  
      @Override
      public String getETag() throws IOException {
          URLConnection openConnection = url.openConnection();
          openConnection.connect();
          String eTag = openConnection.getHeaderField("ETag");
          if (eTag != null) {
              return eTag;
          }
          long lastModified = openConnection.getLastModified();
          long length = openConnection.getContentLengthLong();
          eTag = getSimpleWeakETag(url.toString(), length, lastModified);
          return eTag == null ? null : eTag.substring(2);
      }
  
      @Override
      public String getMimeType() throws IOException {
          return super.getMimeType() == null ? url.openConnection().getContentType() : super.getMimeType();
      }
  
  }