Factory Param Utility Class
---------------------------
Key: GEOT-3050
URL: http://jira.codehaus.org/browse/GEOT-3050
Project: GeoTools
Issue Type: Improvement
Components: data
Affects Versions: 2.6.3
Reporter: Jody Garnett
Assignee: Jody Garnett
Priority: Minor
We return a description of factory parameters in terms of an Param[] (or its
superclass Parameter[]). This is a bit of a pain since it is hard to find a
param entry by key; or sort out what the different utility methods do.
Often you end up writing the same for loops multiple times; or putting things
in a Map<String,Param> just to make programming faster.
The attached class was combined from a bunch of uDig utility code from handling
parameters and operates as a wrapper around a Param[].
{code}
class Params {
Params(DataAccessFactory)
lookup(Class<T>, String, Map<String, ?>)
lookup(Class<T>, Map<String, ?>)
getParam(String)
getParam(Class<?>)
}
{code}
An example use is:
{code}
Params params = new Params( factory );
String host = params.lookup( String.class, "host", connectionParams )
{code}
The expected type is passed in; simply to cut down on casting; if "host" is not
available in the factory params it will not be blindly returned. In a similar
manner the host "sample" value of localhost will be returned if the
connectionParams does not contain an "host" entry. This method builds on
Param.handle( connectionParams ).
Please note that the Param superclass Parameter has less helpful utility
methods; it is my preference to move such things into this Params class rather
then complicate the superclass.
The approach of a wrapper was taken rather then adding methods to DataUtilities.
Notes:
- Params may not be the best name for the class - even the above code example
has too many things named "param". Should use a plural form since we are
wrapping a set of parameters. Ideas: Parameters, ConnectionParameters
- Note this is not Andrea's long standing request for a Java Bean; however this
class could become a formal DynamicProxy (if we pass the connection parameter
values in) or produce a BeanInfo for working with one of the commons bean
classes which present a java map as a bean.
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