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Jersey Integrations
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project 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 or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.web.jersey.multipart;

import java.io.InputStream;
import java.util.Iterator;
import java.util.List;
import org.glassfish.jersey.media.multipart.BodyPart;
import org.glassfish.jersey.media.multipart.FormDataBodyPart;
import org.glassfish.jersey.media.multipart.FormDataMultiPart;

public class MultiPartFileIterator implements Iterator {

  private final Iterator bodyPartIter;

  public MultiPartFileIterator (FormDataMultiPart formDataMultiPart) {

    List bodyPartList;

    if ((bodyPartList = formDataMultiPart.getFields("file")) == null) {
      throw new IllegalArgumentException("You must specify a field name of 'file'");
    }

    bodyPartIter = bodyPartList.iterator();
  }

  @Override
  public boolean hasNext () {

    return bodyPartIter.hasNext();
  }

  @Override
  public MultiPartFile next () {

    FormDataBodyPart bodyPart = bodyPartIter.next();

    return new MultiPartFile(bodyPart.getContentDisposition().getFileName(), getContentType(bodyPart), bodyPart.getValueAs(InputStream.class));
  }

  private String getContentType (BodyPart bodyPart) {

    if (bodyPart.getMediaType() != null) {

      return bodyPart.getMediaType().toString();
    } else {

      String fileName;
      int lastPeriodPos;

      if ((lastPeriodPos = (fileName = bodyPart.getContentDisposition().getFileName()).lastIndexOf('.')) >= 0) {

        MultiPartContentType multiPartContentType;

        if ((multiPartContentType = MultiPartContentType.forExtension(fileName.substring(lastPeriodPos + 1))) != null) {

          return multiPartContentType.getContentType();
        }
      }

      return "application/octet-stream";
    }
  }
}