Java tutorial
/******************************************************************************* * This file is part of the EEG-database project * * ========================================== * * Copyright (C) 2013 by University of West Bohemia (http://www.zcu.cz/en/) * * *********************************************************************************************************************** * * 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. * * *********************************************************************************************************************** * * FileServiceImpl.java, 2013/10/02 00:01 Jakub Rinkes ******************************************************************************/ package cz.zcu.kiv.eegdatabase.wui.core.file; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.sql.Blob; import java.sql.SQLException; import java.util.List; import org.apache.commons.io.IOUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.HibernateException; import org.hibernate.SessionFactory; import org.springframework.beans.factory.annotation.Required; import org.springframework.transaction.annotation.Transactional; import cz.zcu.kiv.eegdatabase.data.dao.DataFileDao; import cz.zcu.kiv.eegdatabase.data.pojo.DataFile; public class FileServiceImpl implements FileService { protected Log log = LogFactory.getLog(getClass()); private DataFileDao fileDAO; private SessionFactory factory; @Required public void setFileDAO(DataFileDao fileDAO) { this.fileDAO = fileDAO; } @Required public void setFactory(SessionFactory factory) { this.factory = factory; } @Override @Transactional public Integer create(DataFile newInstance) { try { Blob createBlob = factory.getCurrentSession().getLobHelper() .createBlob(newInstance.getFileContentStream(), newInstance.getFileContentStream().available()); newInstance.setFileContent(createBlob); return fileDAO.create(newInstance); } catch (HibernateException e) { log.error(e.getMessage(), e); return null; } catch (IOException e) { log.error(e.getMessage(), e); return null; } } @Override @Transactional(readOnly = true) public DataFile read(Integer id) { return fileDAO.read(id); } @Override @Transactional(readOnly = true) public List<DataFile> readByParameter(String parameterName, Object parameterValue) { return fileDAO.readByParameter(parameterName, parameterValue); } @Override @Transactional public void update(DataFile transientObject) { fileDAO.update(transientObject); } @Override @Transactional public void delete(DataFile persistentObject) { fileDAO.delete(persistentObject); } @Override @Transactional(readOnly = true) public List<DataFile> getAllRecords() { return fileDAO.getAllRecords(); } @Override @Transactional(readOnly = true) public List<DataFile> getRecordsAtSides(int first, int max) { return fileDAO.getRecordsAtSides(first, max); } @Override @Transactional(readOnly = true) public int getCountRecords() { return fileDAO.getCountRecords(); } @Override public List<DataFile> getUnique(DataFile example) { return fileDAO.findByExample(example); } @Override @Transactional public FileDTO getFile(int fileId) { FileOutputStream out = null; try { DataFile dataFileEntity = fileDAO.read(fileId); FileDTO dto = new FileDTO(); File tmpFile; tmpFile = File.createTempFile("dataFile", ".tmp"); tmpFile.deleteOnExit(); out = new FileOutputStream(tmpFile); IOUtils.copyLarge(dataFileEntity.getFileContent().getBinaryStream(), out); dto.setFile(tmpFile); dto.setFileName(dataFileEntity.getFilename()); dto.setMimetype(dataFileEntity.getMimetype()); return dto; } catch (IOException e) { log.error(e.getMessage(), e); return null; } catch (SQLException e) { log.error(e.getMessage(), e); return null; } finally { IOUtils.closeQuietly(out); } } }