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.sql.SQLException;
  21 import java.text.MessageFormat;
  22 import java.util.Iterator;
  23 import org.mxchange.addressbook.contact.Contact;
  24 import org.mxchange.addressbook.database.contact.ContactDatabaseConstants;
  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.exceptions.ContactAlreadyAddedException;
  29 import org.mxchange.addressbook.exceptions.UnsupportedDatabaseBackendException;
  30 import org.mxchange.addressbook.manager.contact.ContactManager;
  31
  32 /**
  33  * Stores and retrieves Contact instances
  34  *
  35  * @author Roland Haeder
  36  */
  37 public class ContactDatabaseFrontend extends BaseDatabaseFrontend implements ContactWrapper {
  38
  39         /**
  40          * Constructor which accepts a contact manager
  41          *
  42          * @param manager Manager instance
  43          */
  44         public ContactDatabaseFrontend (final ContactManager manager) {
  45                 // Call own constructor
  46                 this();
  47
  48                 // Trace message
  49                 this.getLogger().trace(MessageFormat.format("manager={0} - CALLED!", manager)); //NOI18N
  50
  51                 // Manager instance must not be null
  52                 if (manager == null) {
  53                         // Abort here
  54                         throw new NullPointerException("manager is null"); //NOI18N
  55                 }
  56
  57                 // Set contact manager
  58                 this.setContactManager(manager);
  59         }
  60
  61         /**
  62          * Basic constrcutor
  63          */
  64         protected ContactDatabaseFrontend () {
  65                 // Trace message
  66                 this.getLogger().trace("CALLED!"); //NOI18N
  67
  68                 // Set "table" name
  69                 this.setTableName("contacts"); //NOI18N
  70
  71                 try {
  72                         // Initalize backend
  73                         this.initBackend();
  74                 } catch (final UnsupportedDatabaseBackendException ex) {
  75                         // Abort program
  76                         this.abortProgramWithException(ex);
  77                 } catch (final SQLException ex) {
  78                         // Abort here
  79                         this.abortProgramWithException(ex);
  80                 }
  81         }
  82
  83         /**
  84          * Adds given contact instance to database
  85          *
  86          * @param contact Contact instance
  87          * @throws org.mxchange.addressbook.exceptions.ContactAlreadyAddedException If the contact instance is already found
  88          */
  89         @Override
  90         public void addContact (final Contact contact) throws ContactAlreadyAddedException {
  91                 // Trace message
  92                 this.getLogger().trace("CALLED!"); //NOI18N
  93
  94                 // Make sure the contact is set
  95                 if (contact == null) {
  96                         // Abort here
  97                         throw new NullPointerException("contact is null"); //NOI18N
  98                 }
  99
 100                 try {
 101                         // First check if the contact is there
 102                         if (this.isContactFound(contact)) {
 103                                 // Already there
 104                                 throw new ContactAlreadyAddedException(contact);
 105                         }
 106
 107                         // Then add it
 108                         this.getBackend().store((Storeable) contact);
 109                 } catch (final IOException ex) {
 110                         // Abort here
 111                         this.abortProgramWithException(ex);
 112                 } catch (final BadTokenException ex) {
 113                         // Abort here
 114                         this.abortProgramWithException(ex);
 115                 }
 116
 117                 // Trace message
 118                 this.getLogger().trace("CALLED!"); //NOI18N
 119         }
 120
 121         /**
 122          * Shuts down the database layer
 123          */
 124         @Override
 125         public void doShutdown () {
 126                 // Trace message
 127                 this.getLogger().trace("CALLED!"); //NOI18N
 128
 129                 // Shutdown backend
 130                 this.getBackend().doShutdown();
 131
 132                 // Trace message
 133                 this.getLogger().trace("EXIT!"); //NOI18N
 134         }
 135
 136         /**
 137          * Some "getter" for total contact count
 138          *
 139          * @return Total contact count
 140          */
 141         @Override
 142         public int getContactsCount () throws SQLException {
 143                 // And deligate to backend
 144                 return this.getBackend().getTotalCount(); //NOI18N
 145         }
 146
 147         /**
 148          * Some "getter" for own contact instance
 149          *
 150          * @return Own contact instance
 151          */
 152         @Override
 153         public Contact getOwnContact () {
 154                 // Trace message
 155                 this.getLogger().trace("CALLED!"); //NOI18N
 156
 157                 throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
 158         }
 159
 160         /**
 161          * Checks if given Contact is found
 162          *
 163          * @param contact Contact instance to check
 164          * @return Whether the given Contact instance is found
 165          */
 166         @Override
 167         public boolean isContactFound (final Contact contact) throws BadTokenException {
 168                 // Trace message
 169                 this.getLogger().trace(MessageFormat.format("contact={0} - CALLED!", contact)); //NOI18N
 170
 171                 // contact should not be null
 172                 if (contact == null) {
 173                         // Abort here
 174                         throw new NullPointerException("contact is null"); //NOI18N
 175                 }
 176
 177                 // Default is not found
 178                 boolean isFound = false;
 179
 180                 // Start iteration
 181                 Iterator<? extends Storeable> iterator = this.getBackend().iterator();
 182
 183                 // Check all entries
 184                 while (iterator.hasNext()) {
 185                         // Get next element
 186                         Contact c = (Contact) iterator.next();
 187
 188                         // Debug message
 189                         this.getLogger().debug(MessageFormat.format("c={0},contact={1}", c, contact)); //NOI18N
 190
 191                         // Is it added?
 192                         if (c.equals(contact)) {
 193                                 // Is found
 194                                 isFound = true;
 195                                 break;
 196                         }
 197                 }
 198
 199                 // Trace message
 200                 this.getLogger().trace(MessageFormat.format("isFound={0} - EXIT!", isFound)); //NOI18N
 201
 202                 // Return it
 203                 return isFound;
 204         }
 205
 206         /**
 207          * Checks whether own contact is found in database
 208          *
 209          * @return Whether own contact is found
 210          */
 211         @Override
 212         public boolean isOwnContactFound () throws SQLException {
 213                 // Deligate this call to backend
 214                 return this.getBackend().isRowFound(ContactDatabaseConstants.COLUMN_NAME_OWN_CONTACT, true);
 215         }
 216 }