com.smash.revolance.ui.database.FileSystemStorage.java Source code

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Here is the source code for com.smash.revolance.ui.database.FileSystemStorage.java

Source

package com.smash.revolance.ui.database;

/*
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * ui-monitoring-database
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Copyright (C) 2012 - 2014 RevoLance
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.springframework.stereotype.Service;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.*;

/**
 * User: wsmash
 * Date: 14/09/13
 * Time: 17:36
 */
@Service
public class FileSystemStorage implements IStorage {
    private File databaseFolder;

    public FileSystemStorage(String root) {
        if (root != null) {
            databaseFolder = new File(System.getProperty("storage.location", ""), root);
            createStorageDirectory();
        }
    }

    private void createStorageDirectory() {
        if (!databaseFolder.exists()) {
            databaseFolder.getParentFile().mkdirs();
            databaseFolder.mkdir();
        }
    }

    @Override
    public void store(String k, String o) throws StorageException {
        store(k, o, false);
    }

    @Override
    public void store(String k, String o, boolean override) throws StorageException {
        if (isKeyValid(k) && (override || !isKeyUsed(k))) {
            FileWriter writer = null;
            File f = new File(databaseFolder, k);
            try {
                f.createNewFile();
                writer = new FileWriter(f);
                writer.write(o);

                writer.close();
            } catch (IOException e) {
                throw new StorageException("Unable to create file: " + f + " or to write data into it.");
            } finally {
                IOUtils.closeQuietly(writer);
            }
        } else {
            throw new StorageException("Invalid or already used key: '" + k + "'.");
        }
    }

    @Override
    public String retrieve(String key) throws StorageException {
        if (isKeyValid(key) && isKeyUsed(key)) {
            try {
                return FileUtils.readFileToString(new File(databaseFolder, key), "UTF-8");
            } catch (IOException e) {
                throw new StorageException("Unable to retrieve stored content for key: " + key);
            }
        } else {
            throw new StorageException("Invalid or unused key: " + key);
        }
    }

    @Override
    public Map<String, String> retrieveAll() {
        Map<String, String> filesContent = new HashMap<String, String>();
        File[] files = databaseFolder.listFiles();

        if (files != null) {
            for (File file : files) {
                try {
                    filesContent.put(file.getName(), FileUtils.readFileToString(file));
                } catch (IOException e) {
                    //TODO: log the exception but do not prevent moving on the loop
                }
            }
        }
        return filesContent;
    }

    @Override
    public Collection<String> getKeys() {
        List<String> keys = new ArrayList();

        File[] files = databaseFolder.listFiles();

        if (files != null) {
            for (File file : files) {
                keys.add(file.getName());
            }
        }

        return keys;

    }

    @Override
    public boolean isKeyUsed(String key) {
        return new File(databaseFolder, key).exists();
    }

    @Override
    public boolean isKeyValid(String key) {
        return !key.contains("#") || !key.contains("/") || !key.contains(".") || !key.contains("-")
                || !key.contains("_");
    }

    @Override
    public void clear() throws StorageException {
        try {
            FileUtils.forceDelete(databaseFolder);
            databaseFolder.mkdirs();
        } catch (IOException e) {
            throw new StorageException("Unable to clear storage system.", e);
        }
    }

    @Override
    public File getLocation() {
        return databaseFolder;
    }

    @Override
    public String delete(String key) throws StorageException {
        if (isKeyValid(key) && isKeyUsed(key)) {
            try {
                String content = retrieve(key);
                FileUtils.forceDelete(new File(databaseFolder, key));
                return content;
            } catch (IOException e) {
                throw new StorageException(e.getMessage());
            }
        } else {
            throw new StorageException("Invalid or unknown key: '" + key + "'.");
        }
    }
}