Java tutorial
/** * openkm, Open Document Management System (http://www.openkm.com) * Copyright (c) 2006-2013 Paco Avila & Josep Llort * * No bytes were intentionally harmed during the development of this application. * * 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 2 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, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ package com.ikon.module.db.stuff; 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 java.security.NoSuchAlgorithmException; import org.apache.commons.io.IOUtils; import org.hibernate.HibernateException; import org.hibernate.Session; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.ikon.core.Config; import com.ikon.core.DatabaseException; import com.ikon.dao.HibernateUtil; import com.ikon.dao.bean.NodeDocumentVersion; import com.ikon.util.SecureStore; public class FsDataStore { private static Logger log = LoggerFactory.getLogger(FsDataStore.class); public static final String DATASTORE_BACKEND_FS = "fs"; public static final String DATASTORE_BACKEND_DB = "db"; public static final String DATASTORE_DIRNAME = "datastore"; /** * Write to data store */ public static File save(String uuid, InputStream is) throws IOException { log.debug("save({}, {})", uuid, is); File fs = resolveFile(uuid); fs.getParentFile().mkdirs(); FileOutputStream fos = new FileOutputStream(fs); IOUtils.copy(is, fos); IOUtils.closeQuietly(fos); return fs; } /** * Read from data store */ public static InputStream read(String uuid) throws FileNotFoundException { log.debug("read({})", uuid); return new FileInputStream(resolveFile(uuid)); } /** * Purge data store file */ public static void delete(String uuid) throws IOException { log.debug("delete({})", uuid); File fs = resolveFile(uuid); if (!fs.delete()) { throw new IOException("Could not delete file '" + fs.getParent() + "/" + uuid + "'"); } } /** * Copy a datastore file to another version */ public static void copy(NodeDocumentVersion srcDocVer, NodeDocumentVersion dstDocVer) throws IOException { FileInputStream fis = null; try { fis = new FileInputStream(resolveFile(srcDocVer.getUuid())); save(dstDocVer.getUuid(), fis); } finally { IOUtils.closeQuietly(fis); } } /** * Persis document file */ public static void persist(NodeDocumentVersion nDocVer, InputStream is) throws IOException { log.debug("persist({}, {})", nDocVer, is); if (FsDataStore.DATASTORE_BACKEND_FS.equals(Config.REPOSITORY_DATASTORE_BACKEND)) { File dsRaw = FsDataStore.save(nDocVer.getUuid(), is); if (Config.REPOSITORY_CONTENT_CHECKSUM) { try { String checkSum = SecureStore.md5Encode(dsRaw); nDocVer.setChecksum(checkSum); } catch (NoSuchAlgorithmException e) { log.warn(e.getMessage(), e); } } } else { byte[] raw = IOUtils.toByteArray(is); nDocVer.setContent(raw); if (Config.REPOSITORY_CONTENT_CHECKSUM) { try { String checkSum = SecureStore.md5Encode(raw); nDocVer.setChecksum(checkSum); } catch (NoSuchAlgorithmException e) { log.warn(e.getMessage(), e); } } } log.debug("persist: void"); } /** * Purge orphan datastore files. * * This method will remove datastore files not corresponding with a NodeDocumentVersion. */ public static void purgeOrphanFiles() throws DatabaseException, IOException { log.debug("purgeOrphanFiles()"); Session session = null; try { session = HibernateUtil.getSessionFactory().openSession(); purgeOrphanFilesHelper(session, new File(Config.REPOSITORY_DATASTORE_HOME)); log.debug("purgeOrphanFiles: void"); } catch (HibernateException e) { throw new DatabaseException(e.getMessage(), e); } finally { HibernateUtil.close(session); } } /** * Purge orphan datastore files helper */ private static void purgeOrphanFilesHelper(Session session, File dir) throws HibernateException, IOException { for (File child : dir.listFiles()) { if (child.isFile()) { if (session.get(NodeDocumentVersion.class, child.getName()) == null) { if (!child.delete()) { log.warn("Could not delete file '" + child.getCanonicalPath() + "'"); } } } else if (child.isDirectory()) { purgeOrphanFilesHelper(session, child); } } } /** * Get file from uuid */ public static File resolveFile(String uuid) { char[] seq = uuid.replaceAll("-", "").toCharArray(); StringBuilder path = new StringBuilder(); // For really big repositories maybe better: i < seq.length // But for most usual repositories a 4 depth level is enough for (int i = 0; i < 8; i = i + 2) { path.append(seq[i]).append(seq[i + 1]).append(File.separator); } return new File(Config.REPOSITORY_DATASTORE_HOME + File.separator + path.toString() + uuid); } /** * Purge empty datastore directories. */ public static void purgeEmptyDirectories() throws IOException { log.debug("purgeEmptyDirectories()"); purgeEmptyDirectoriesHelper(new File(Config.REPOSITORY_DATASTORE_HOME)); } /** * Purge empty datastore directories helper */ private static boolean purgeEmptyDirectoriesHelper(File dir) throws IOException { boolean isEmpty = true; File[] children = dir.listFiles(); if (children.length > 0) { for (File child : children) { if (child.isDirectory()) { isEmpty = purgeEmptyDirectoriesHelper(child); if (isEmpty) { child.delete(); } } else if (child.isFile()) { isEmpty = false; } } } else { isEmpty = true; } return isEmpty; } }