MailProviders.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.mail.provider;
 
import java.io.IOException;
import org.turro.elephant.context.Application;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.context.IConstructor;
import org.turro.file.Document;
import org.turro.log.WebLoggers;
import org.turro.mail.pool.MailMessagePool;
 
public class MailProviders {
  
  public static final String GENERIC = "Generic";
 
  public MailMessagePool getGeneric() {
    return getPool(Application.getApplication().getConstructor(), GENERIC);
  }
  
  public MailMessagePool getGeneric(IConstructor constructor) {
    return getPool(constructor, GENERIC);
  }
  
  public MailMessagePool getPool(IConstructor constructor, String name) {
    if(providers != null) {
      MailProvider provider = providers.get(name);
      if(provider != null) {
        return MailMessagePool.of(constructor, provider);
      }
    }
    return null;
  }
  
  public MailProvider getProvider(String name) {
    if(providers != null) {
      return providers.get(name);
    }
    return null;
  }
  
  /* Factory */
  
  public static MailProviders instance() {
    return new MailProviders();
  }
  
  private static final String PROVIDERS_FILE = "/WEB-INF/elephant/conf/mail/providers.json";
  
  private final MailProviderSet providers;
 
  private MailProviders() {
    providers = loadProviders();
  }
 
  private MailProviderSet loadProviders() {
    Document providersFile = Document.from(ElephantContext.getRealPath(PROVIDERS_FILE));
    if(providersFile.exists()) {
      try {
        return MailProviderSet.from(providersFile.content());
      } catch (IOException ex) {
        WebLoggers.severe(this).exception(ex).log();
      }
    } else {
      MailProviderSet mailProviderSet = MailProviderMigration.migrate();
      try {
        providersFile.content(mailProviderSet.toJson());
        return mailProviderSet;
      } catch (IOException ex) {
        WebLoggers.severe(this).exception(ex).log();
      }
    }
    return null;
  }
 
}