org.plista.kornakapi.web.servlets.BatchSetPreferencesServlet.java Source code

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Here is the source code for org.plista.kornakapi.web.servlets.BatchSetPreferencesServlet.java

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/**
 * Copyright 2012 plista GmbH  (http://www.plista.com/)
 *
 * 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.plista.kornakapi.web.servlets;

import com.google.common.io.Closeables;

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.mahout.cf.taste.model.Preference;
import org.plista.kornakapi.core.io.CSVPreferenceFileIterator;
import org.plista.kornakapi.core.storage.Storage;
import org.plista.kornakapi.web.Parameters;

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

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

/** servlet to add preferences in batch */
public class BatchSetPreferencesServlet extends BaseServlet {

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

        int batchSize = getParameterAsInt(request, Parameters.BATCH_SIZE, Parameters.DEFAULT_BATCH_SIZE);

        ServletFileUpload upload = new ServletFileUpload();

        FileItemIterator fileItems;
        InputStream in = null;

        boolean fileProcessed = false;

        Storage storage = this.getDomainIndependetStorage();

        try {
            fileItems = upload.getItemIterator(request);
            while (fileItems.hasNext()) {

                FileItemStream item = fileItems.next();

                if (Parameters.FILE.equals(item.getFieldName()) && !item.isFormField()) {

                    in = item.openStream();
                    Iterator<Preference> preferences = new CSVPreferenceFileIterator(in);

                    storage.batchSetPreferences(preferences, batchSize);

                    fileProcessed = true;

                    break;
                }
            }
        } catch (FileUploadException e) {
            throw new IOException(e);
        } finally {
            Closeables.closeQuietly(in);
        }

        if (!fileProcessed) {
            throw new IllegalStateException("Unable to find supplied data file!");
        }
    }
}