com.github.terma.gigaspacewebconsole.server.ImportServlet.java Source code

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Here is the source code for com.github.terma.gigaspacewebconsole.server.ImportServlet.java

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/*
Copyright 2015-2016 Artem Stasiuk
    
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 com.github.terma.gigaspacewebconsole.server;

import com.github.terma.gigaspacewebconsole.core.ImportRequest;
import com.google.gson.Gson;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;

public class ImportServlet extends HttpServlet {

    private final Gson gson = new Gson();

    @Override
    protected void doPost(final HttpServletRequest request, final HttpServletResponse response)
            throws ServletException, IOException {
        try {
            safeDoPost(request);

            response.sendRedirect(request.getContextPath());
        } catch (IOException exception) {
            throw exception;
        } catch (Exception exception) {
            throw new IOException(exception);
        }
    }

    private void safeDoPost(final HttpServletRequest request) throws Exception {
        final ServletFileUpload upload = new ServletFileUpload();
        final FileItemIterator iterator = upload.getItemIterator(request);

        ImportRequest importRequest = null;
        String inputFile = null;
        InputStream inputStream = null;

        while (iterator.hasNext()) {
            final FileItemStream item = iterator.next();
            final String name = item.getFieldName();
            final InputStream stream = item.openStream();

            if (item.isFormField()) {
                if ("json".equals(name)) {
                    importRequest = gson.fromJson(Streams.asString(stream), ImportRequest.class);
                }
            } else {
                inputFile = item.getName();
                inputStream = stream;
                break;
            }
        }

        if (importRequest == null)
            throw new IOException("Expect 'json' parameter!");
        if (inputStream == null)
            throw new IOException("Expect file to import!");

        importRequest.file = inputFile;
        ProviderResolver.getProvider(importRequest.driver).import1(importRequest, inputStream);
    }

}