package com.atlassian.activeobjects.spi;
   
   import com.atlassian.tenancy.api.Tenant;
   import com.atlassian.tenancy.api.TenantAccessor;
   
   import javax.annotation.Nonnull;
   import javax.annotation.Nullable;
   import java.util.Iterator;
   
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * Products that can't yet provide {@link com.atlassian.tenancy.api.TenantContext#getCurrentTenant()} that works in _all_
   * threads should expose a {@link com.atlassian.activeobjects.spi.CompatibilityTenantContextImpl} in their SPI.
   *
   * @since 0.26.1
   */
  public class CompatibilityTenantContextImpl implements CompatibilityTenantContext {
      private final TenantAccessor tenantAccessor;
  
      public CompatibilityTenantContextImpl(@Nonnull final TenantAccessor tenantAccessor) {
          this.tenantAccessor = checkNotNull(tenantAccessor);
      }
  
      /**
       * Retrieve the current tenant.
       *
       * Hacky as hell for now; it just retrieves the first of the available tenants.
       *
       * We don't really know, yet, how we're going to identify the current tenant when there are multiple available,
       * however it can be done in this one and only one place. Probably going to be a thread local...
       *
       * @return null if no tenant present
       */
      @Nullable
      @Override
      public Tenant getCurrentTenant() {
          // just get the the first (and only) tenant
          Iterator<Tenant> tenantIterator = tenantAccessor.getAvailableTenants().iterator();
          if (tenantIterator.hasNext()) {
              return tenantIterator.next();
          } else {
              return null;
          }
      }
  }