LocalFileStore.java

/*
 * Copyright 2013-2017 Erudika. https://erudika.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.
 *
 * For issues and patches go to: https://github.com/erudika
 */
package com.erudika.para.storage;

import com.erudika.para.utils.Config;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Stores files locally.
 *
 * @author Alex Bogdanovski [alex@erudika.com]
 */
public class LocalFileStore implements FileStore {

	private static final Logger logger = LoggerFactory.getLogger(LocalFileStore.class);
	private String folder;

	/**
	 * No-args constructor.
	 */
	public LocalFileStore() {
		this(Config.getConfigParam("para.localstorage.folder", ""));
	}

	/**
	 * Consturcts a new instance based on a given folder.
	 * @param folder the folder to store files in
	 */
	public LocalFileStore(String folder) {
		if (StringUtils.endsWith(folder, File.separator)) {
			this.folder = folder;
		} else {
			this.folder = folder.concat(File.separator);
		}
	}

	@Override
	public InputStream load(String path) {
		if (StringUtils.startsWith(path, File.separator)) {
			path = path.substring(1);
		}
		if (!StringUtils.isBlank(path)) {
			FileInputStream fis = null;
			try {
				File f = new File(folder + File.separator + path);
				fis = new FileInputStream(f);
				return f.canRead() ? new BufferedInputStream(fis) : null;
			} catch (FileNotFoundException ex) {
				logger.error(null, ex);
			} finally {
				if (fis != null) {
					try {
						fis.close();
					} catch (IOException ex) {
						logger.error(null, ex);
					}
				}
			}
		}
		return null;
	}

	@Override
	public String store(String path, InputStream data) {
		if (StringUtils.startsWith(path, File.separator)) {
			path = path.substring(1);
		}
		if (StringUtils.isBlank(path)) {
			return null;
		}
		int maxFileSizeMBytes = Config.getConfigInt("para.localstorage.max_filesize_mb", 10);
		FileOutputStream fos = null;
		BufferedOutputStream bos = null;
		try {
			if (data.available() > 0 && data.available() <= (maxFileSizeMBytes * 1024 * 1024)) {
				File f = new File(folder + File.separator + path);
				if (f.canWrite()) {
					fos = new FileOutputStream(f);
					bos = new BufferedOutputStream(fos);
					int read = 0;
					byte[] bytes = new byte[1024];
					while ((read = data.read(bytes)) != -1) {
						bos.write(bytes, 0, read);
					}
					return f.getAbsolutePath();
				}
			}
		} catch (IOException e) {
			logger.error(null, e);
		} finally {
			try {
				if (fos != null) {
					fos.close();
				}
				if (bos != null) {
					bos.close();
				}
				data.close();
			} catch (IOException e) {
				logger.error(null, e);
			}
		}
		return null;
	}

	@Override
	public boolean delete(String path) {
		if (StringUtils.startsWith(path, File.separator)) {
			path = path.substring(1);
		}
		if (!StringUtils.isBlank(path)) {
			File f = new File(folder + File.separator + path);
			return f.canWrite() && f.delete();
		}
		return false;
	}

}