com.github.bfour.fpliteraturecollector.service.FileStorageService.java Source code

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Here is the source code for com.github.bfour.fpliteraturecollector.service.FileStorageService.java

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/*
 * Copyright 2016 Florian Pollak
 *
 *  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.bfour.fpliteraturecollector.service;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.text.Normalizer;
import java.util.Date;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;

import com.github.bfour.fpliteraturecollector.domain.Link;
import com.github.bfour.fpliteraturecollector.domain.Literature;

public class FileStorageService {

    private static FileStorageService instance;

    private static final File rootDirectory = new File("./files/");

    private FileStorageService() {
    }

    public static FileStorageService getInstance() {
        if (instance == null)
            instance = new FileStorageService();
        return instance;
    }

    public Link persist(URL webAddress, Literature lit) throws IOException {

        String fileName = getFileNameForLiterature(lit);
        fileName += ".pdf";
        // + FilenameUtils.getExtension(webAddress.getFile()).substring(0,
        // 3);
        File file = new File(rootDirectory.getAbsolutePath() + "/" + lit.getID() + "/" + fileName);

        URLConnection conn = webAddress.openConnection();
        conn.setRequestProperty("User-Agent",
                "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0");
        conn.connect();
        FileUtils.copyInputStreamToFile(conn.getInputStream(), file);

        return new Link(fileName, file.toURI(), webAddress.toString());

    }

    public Link persist(File localFile, Literature lit) throws IOException {

        String fileName = getFileNameForLiterature(lit);
        fileName += "." + FilenameUtils.getExtension(localFile.getAbsolutePath());
        File file = new File(rootDirectory.getAbsolutePath() + "/" + lit.getID() + "/" + fileName);

        FileUtils.copyFile(localFile, file);

        return new Link(fileName, file.toURI());

    }

    private String getFileNameForLiterature(Literature lit) {

        // take title, removing all special characters
        String name = Normalizer.normalize(lit.getTitle(), Normalizer.Form.NFD).replaceAll("[^\\p{ASCII}]", "");

        name = name.replaceAll("[^A-z\\s]", "");

        // remove unnecessary words
        name = name.replaceAll("\\sa\\s", " ");
        name = name.replaceAll("\\sthe\\s", " ");
        name = name.replaceAll("\\sA\\s", " ");
        name = name.replaceAll("\\sThe\\s", " ");

        // trim
        if (name.length() > 68)
            name = name.substring(0, 68);

        // add kind-of GUID
        name += "_" + Long.toHexString(new Date().getTime());

        return name;

    }

}