package com.atlassian.activeobjects.internal;
   
   import com.atlassian.sal.api.pluginsettings.PluginSettings;
   import com.atlassian.sal.api.pluginsettings.PluginSettingsFactory;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
  /**
   * Sole implementation of {@link com.atlassian.activeobjects.internal.DataSourceTypeResolver},
   * configuration of data source type is 'simply' stored as a
   * {@link com.atlassian.sal.api.pluginsettings.PluginSettings plugin setting}.
   */
  public final class DataSourceTypeResolverImpl implements DataSourceTypeResolver {
      private final Logger logger = LoggerFactory.getLogger(this.getClass());
  
      private final PluginSettings pluginSettings;
      private final DataSourceType defaultDataSourceType;
      private final ActiveObjectsSettingKeys settingKeys;
  
      public DataSourceTypeResolverImpl(PluginSettingsFactory pluginSettingsFactory, ActiveObjectsSettingKeys settingKeys, DataSourceType defaultDataSourceType) {
          checkNotNull(pluginSettingsFactory);
          this.pluginSettings = checkNotNull(pluginSettingsFactory.createGlobalSettings());
          this.settingKeys = checkNotNull(settingKeys);
          this.defaultDataSourceType = checkNotNull(defaultDataSourceType);
      }
  
      public DataSourceType getDataSourceType(Prefix prefix) {
          final String setting = getSetting(prefix);
          if (setting != null) {
              try {
                  return DataSourceType.valueOf(setting);
              } catch (IllegalArgumentException e) {
                  // if an incorrect value is stored, then we fall back on the default, not without a warning in the logs
                  logger.warn("Active objects data source type setting <" + setting + "> for key <" + getSettingKey(prefix) + "> " +
                          "could not be resolved to a valid " + DataSourceType.class.getName() + ". Using default value" +
                          " <" + defaultDataSourceType + ">.");
                  return defaultDataSourceType;
              }
          } else {
              return defaultDataSourceType;
          }
      }
  
      private String getSetting(Prefix prefix) {
          return (String) pluginSettings.get(getSettingKey(prefix));
      }
  
      private String getSettingKey(Prefix prefix) {
          return settingKeys.getDataSourceTypeKey(prefix);
      }
  }