/*
 * Copyright 2012 LinkedIn, Inc
 * 
 * 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 azkaban.webapp.servlet;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class MultipartParser {

	private DiskFileItemFactory _uploadItemFactory;

	public MultipartParser(int spillToDiskSize) {
		_uploadItemFactory = new DiskFileItemFactory();
		_uploadItemFactory.setSizeThreshold(spillToDiskSize);
	}

	@SuppressWarnings("unchecked")
	public Map<String, Object> parseMultipart(HttpServletRequest request)
			throws IOException, ServletException {
		ServletFileUpload upload = new ServletFileUpload(_uploadItemFactory);
		List<FileItem> items = null;
		try {
			items = upload.parseRequest(request);
		} catch (FileUploadException e) {
			throw new ServletException(e);
		}

		Map<String, Object> params = new HashMap<String, Object>();
		for (FileItem item : items) {
			if (item.isFormField())
				params.put(item.getFieldName(), item.getString());
			else
				params.put(item.getFieldName(), item);
		}
		return params;
	}

}
