Addressbook/src/org/mxchange/addressbook/database/frontend/contact/ContactDatabaseFrontend.java

   1 /*
   2  * Copyright (C) 2015 Roland Haeder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.addressbook.database.frontend.contact;
  18
  19 import java.io.IOException;
  20 import java.text.MessageFormat;
  21 import java.util.Iterator;
  22 import java.util.List;
  23 import org.mxchange.addressbook.contact.Contact;
  24 import org.mxchange.addressbook.database.backend.csv.CsvBackend;
  25 import org.mxchange.addressbook.database.frontend.BaseDatabaseFrontend;
  26 import org.mxchange.addressbook.database.storage.Storeable;
  27 import org.mxchange.addressbook.exceptions.BadTokenException;
  28 import org.mxchange.addressbook.manager.contact.ContactManager;
  29
  30 /**
  31  * Stores and retrieves Contact instances
  32  *
  33  * @author Roland Haeder
  34  */
  35 public class ContactDatabaseFrontend extends BaseDatabaseFrontend implements ContactWrapper {
  36
  37         /**
  38          * Constructor which accepts a contact manager
  39          *
  40          * @param manager
  41          */
  42         public ContactDatabaseFrontend (final ContactManager manager) {
  43                 // Call own constructor
  44                 this();
  45
  46                 // Trace message
  47                 this.getLogger().trace(MessageFormat.format("manager={0} - CALLED!", manager)); //NOI18N
  48
  49                 // Manager instance must not be null
  50                 if (manager == null) {
  51                         // Abort here
  52                         throw new NullPointerException("manager is null"); //NOI18N
  53                 }
  54
  55                 // Set contact manager
  56                 this.setContactManager(manager);
  57         }
  58
  59         /**
  60          * Basic constrcutor
  61          */
  62         protected ContactDatabaseFrontend () {
  63                 super();
  64
  65                 // Trace message
  66                 this.getLogger().trace("CALLED!"); //NOI18N
  67
  68                 // Set "table" name
  69                 this.setTableName("contacts"); //NOI18N
  70
  71                 // Initalize backend
  72                 this.initBackend();
  73         }
  74
  75         /**
  76          * Shuts down the database layer
  77          */
  78         @Override
  79         public void doShutdown () {
  80                 // Trace message
  81                 this.getLogger().trace("CALLED!"); //NOI18N
  82
  83                 // Shutdown backend
  84                 this.getBackend().doShutdown();
  85
  86                 // Trace message
  87                 this.getLogger().trace("EXIT!"); //NOI18N
  88         }
  89
  90         /**
  91          * Flushes all contact entries to database
  92          */
  93         @Override
  94         public void flushAllContacts () {
  95                 // Trace message
  96                 this.getLogger().trace("CALLED!"); //NOI18N
  97
  98                 // Get full list
  99                 List<Contact> contacts = this.getContactManager().getList();
 100
 101                 // Get iterator
 102                 Iterator<Contact> iterator = contacts.iterator();
 103
 104                 // Rewind backend
 105                 this.getBackend().rewind();
 106
 107                 // Get all entries
 108                 while (iterator.hasNext()) {
 109                         // Get next entry
 110                         Contact contact = iterator.next();
 111
 112                         try {
 113                                 // Store this entry
 114                                 this.getBackend().store((Storeable) contact);
 115                         } catch (final IOException ex) {
 116                                 // Should not happen?
 117                                 this.getLogger().catching(ex);
 118                                 System.exit(1);
 119                         }
 120                 }
 121
 122                 // Trace message
 123                 this.getLogger().trace("EXIT!"); //NOI18N
 124         }
 125
 126         /**
 127          * Reads all contacts from database backend and handles them over to the
 128          * contact manager
 129          */
 130         @Override
 131         public void readAllContacts () {
 132                 // Trace message
 133                 this.getLogger().trace("CALLED!"); //NOI18N
 134
 135                 // Get iterator and case it
 136                 CsvBackend backend = (CsvBackend) this.getBackend();
 137
 138                 // First rewind to beginning
 139                 this.getBackend().rewind();
 140
 141                 // Get backend iterator
 142                 Iterator<Contact> iterator = null;
 143                 try {
 144                         iterator = backend.contactIterator();
 145                 } catch (final BadTokenException ex) {
 146                         this.getLogger().catching(ex);
 147                         System.exit(1);
 148                 }
 149
 150                 // Read all entries
 151                 while (iterator.hasNext()) {
 152                         // Get next entry
 153                         Contact contact = iterator.next();
 154
 155                         // Add contact instance to manager
 156                         this.getContactManager().addContact(contact);
 157                 }
 158
 159                 // Trace message
 160                 this.getLogger().trace("EXIT!"); //NOI18N
 161         }
 162 }