io.lightlink.servlet.MultipartParameters.java Source code

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Here is the source code for io.lightlink.servlet.MultipartParameters.java

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package io.lightlink.servlet;

/*
 * #%L
 * lightlink-core
 * %%
 * Copyright (C) 2015 Vitaliy Shevchuk
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.HashMap;

public class MultipartParameters {
    HttpServletRequest req;
    private FileItemIterator fileItemIterator;
    private FileItemStream fileItemStream;

    private HashMap<String, Object> paramsMap;
    boolean parametersParsed;

    public MultipartParameters(HttpServletRequest req) {
        this.req = req;
    }

    public HashMap<String, Object> getInitialParams() throws IOException, FileUploadException {
        paramsMap = new HashMap<String, Object>();

        ServletFileUpload upload = new ServletFileUpload();

        fileItemIterator = upload.getItemIterator(req);

        parseUpToNextStream();
        parametersParsed = true;

        return paramsMap;
    }

    public boolean hasNextStream() throws IOException, FileUploadException {
        if (!parametersParsed) {
            parseUpToNextStream();
            parametersParsed = true;
        }
        return fileItemStream != null;
    }

    public FileItemStream getNextStream() throws IOException, FileUploadException {
        fileItemStream = null;
        if (!parametersParsed)
            parseUpToNextStream();

        parametersParsed = false; // a stream is returned, so the following parsing is required;

        return fileItemStream;
    }

    private void parseUpToNextStream() throws FileUploadException, IOException {
        while (fileItemIterator.hasNext()) {
            FileItemStream fItemStream = fileItemIterator.next();
            String name = fItemStream.getFieldName();
            if (fItemStream.isFormField()) {
                paramsMap.put(name, Streams.asString(fItemStream.openStream()));
            } else {
                this.fileItemStream = fItemStream;
                break; // returns and waits while the the stream is consumed
            }
        }
    }

    public HashMap<String, Object> getParamsMap() {
        return paramsMap;
    }

}