public Object lookup()

in src/java/org/apache/fulcrum/yaafi/framework/container/ServiceContainerImpl.java [610:670]
46 lines of code
13 McCabe index (conditional complexity)

	public Object lookup(String name) throws ServiceException {
		Validate.notEmpty(name, "name");

		Object result = null;
		ServiceComponent serviceManagerComponent;

		if (this.isAlreadyDisposed()) {
			String msg = "The container is disposed an no services are available";
			this.getLogger().error(msg);
			throw new ServiceException(name, msg);
		}

		try {
			synchronized (this) {
				// 1) check our local services
				serviceManagerComponent = this.getLocalServiceComponent(name);

				if (serviceManagerComponent != null) {
					result = serviceManagerComponent.getInstance();

					if (result != null && this.getLogger().isDebugEnabled()) {
						String msg = "Located the service '" + name + "' in the local container";
						this.getLogger().debug(msg);
					}
				}

				// 2) look at fallback service managers
				if (result == null) {
					result = this.getFallbackService(name);
				}
			}
		} catch (ServiceException e) {
			String msg = "Failed to lookup a service " + name;
			this.getLogger().error(msg, e);
			throw e;
		} catch (Throwable t) {
			String msg = "Failed to lookup a service " + name;
			this.getLogger().error(msg, t);
			throw new ServiceException(name, msg, t);
		}

		// 3) if we haven't found anything ask the parent ServiceManager
		if (result == null && this.hasParentServiceManager()) {
			result = this.getParentServiceManager().lookup(name);

			if (result != null && this.getLogger().isDebugEnabled()) {
				String msg = "Located the service '" + name + "' using the parent service manager";
				this.getLogger().debug(msg);
			}
		}

		// if we still haven't found anything then complain

		if (result == null) {
			String msg = "The following component does not exist : " + name;
			this.getLogger().error(msg);
			throw new ServiceException(AvalonYaafiConstants.AVALON_CONTAINER_YAAFI, name);
		}

		return result;
	}