org.odk.voice.storage.MultiPartFormData.java Source code

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Here is the source code for org.odk.voice.storage.MultiPartFormData.java

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/*
 * Copyright (C) 2009 Google 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 org.odk.voice.storage;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.odk.voice.constants.FileConstants;

/**
 * Parses a multi part form request into a set of multiPartFormItems. The
 * information stored in items are indexed by either the field name or 
 * the file name (or both) provided in the http submission
 * 
 * @author wbrunette@gmail.com
 *
 */
public class MultiPartFormData {

    private Map<String, MultiPartFormItem> fieldNameMap;

    private Map<String, MultiPartFormItem> fileNameMap;

    /**
     * Construct a mult-part form data container by parsing
     * a multi part form request into a set of multipartformitems. The
     * information are stored in items and are indexed by either 
     * the field name or the file name (or both) provided in the http submission
     * 
     * @param req
     *     an HTTP request from a multipart form 
        
     * @throws FileUploadException
     * @throws IOException
     */
    public MultiPartFormData(HttpServletRequest req) throws FileUploadException, IOException {

        fieldNameMap = new HashMap<String, MultiPartFormItem>();
        fileNameMap = new HashMap<String, MultiPartFormItem>();

        ServletFileUpload upload = new ServletFileUpload(new DiskFileItemFactory());
        upload.setFileSizeMax(FileConstants.MAX_FILE_SIZE);

        FileItemIterator items = upload.getItemIterator(req);
        while (items.hasNext()) {
            FileItemStream item = items.next();
            ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
            BufferedInputStream formStream = new BufferedInputStream(item.openStream());

            // TODO: determine ways to possibly improve efficiency
            int nextByte = formStream.read();
            while (nextByte != -1) {
                byteStream.write(nextByte);
                nextByte = formStream.read();
            }

            MultiPartFormItem data = new MultiPartFormItem(item.getFieldName(), item.getName(),
                    item.getContentType(), byteStream.toByteArray());

            String fieldName = item.getFieldName();
            if (fieldName != null) {
                fieldNameMap.put(fieldName, data);
            }

            String fileName = item.getName();
            if (fileName != null) {
                // TODO: possible bug in ODK collect is truncating file extension
                // may need to remove this code after ODK collect is fixed
                int indexOfExtension = fileName.lastIndexOf(".");
                if (indexOfExtension > 0) {
                    fileNameMap.put(fileName.substring(0, indexOfExtension), data);
                }
                fileNameMap.put(fileName, data);
            }
        }
    }

    public MultiPartFormItem getFormDataByFieldName(String fieldName) {
        return fieldNameMap.get(fieldName);
    }

    public MultiPartFormItem getFormDataByFileName(String fileName) {
        return fileNameMap.get(fileName);
    }

}