___________________________________________________________________________________________
In UserContext
___________________________________________________________________________________________

private void setUserLocation() {
		if (this.user != null) {
			String locationId = this.user.getUserProperty(OpenmrsConstants.USER_PROPERTY_DEFAULT_LOCATION);
			if (StringUtils.isNotBlank(locationId)) {
				//only go ahead if it has actually changed OR if wasn't set before
				if (this.locationId == null || !this.locationId.getName().equalsIgnoreCase(locationId)) {
					try {
						this.locationId = Context.getLocationService().getLocationId(Integer.valueOf(locationId));
					}
					catch (NumberFormatException e) {
						//Drop the stored value since we have no match for the set id
						if (this.locationId != null)
							this.locationId = null;
						log.warn("The value of the default Location property of the user with id:" + this.user.getUserId()
						        + " should be an integer", e);
					}
				}
			} else {
				if (this.locationId != null)
					this.locationId = null;
			}
		}
	}



______________________________________________________________________________
In Location Service
_______________________________________________________________________________

/**
	 * Returns locationId from Location object
	 *
	 * @param locationId
	 * @return LocationId
	 * @since 1.5
	 */
	@Authorized(PrivilegeConstants.GET_LOCATIONS)
	public Integer getLocationId(Integer locationId);