Hmm, I'm not sure your getting me, I'm refering to making the
Configuration interface a proper Map via an extension of the Collection
API's Map Interface and requiring all implementations to support that
interface (Which could be facilitated through Abstraction/Polymorphism)
with little impact to the existing usage.
http://jakarta.apache.org/commons/configuration/apidocs/org/apache/commons/configuration/Configuration.html
-Mark
Brent Verner wrote:
[2004-05-18 09:20] Mark R. Diggory said:
| Brent Verner wrote:
|
| >[2004-05-18 08:43] Mark R. Diggory said:
| >| To extend the subject of refactoring. I want to be able to access
| >| Configuration objects from EL references in JSP 2.0.
| >|
| >| ${sessionScope.config.foo.bar}
| >
| >I do something similar _with_ properties configuration. The syntax
| >I use is
| >
| > ${sessionScope.config['some.config.key']}
| >
| >after doing
| >
| > session.setAttribute("config",someMap);
| >
| >I'm not sure it is worth the effort to work around the "['...']"
| >syntax requirement/limitation, since the key/value configuration
| >would have to be copied into something that EL can address
| >directly (most simply a Map of Map [[of Map ] ...])
| >
| >cheers.
| > brent
| >
|
| Yes, but maintaining a generic Map interface on the objects in the
| configuration hierarchy would probably be very beneficial anywhere that
| this similar approach of automation/reflection occurs. Would it not? It
| probably would make for a simple backwards compatible refactoring.
Yeah, that makes sense. Here goes a sample impl. that looks like
it'd do what you want.
cheers
b
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.util.StringTokenizer;
public class x {
public void insert(Map m, String key, String value){
// XXX: will not account for non-separator '.' such as a key that looks like
"some.key.adn[something.that.ya.don't.want.nested].whatever.else"
Map rv = null;
int dp = key.indexOf(".");
String rest = null;
String first = key;
if( dp > 0 ){
first = key.substring(0,dp);
rest = key.substring(dp + 1);
}
rv = (Map)m.get(first);
if( rv == null ){
rv = new HashMap();
m.put(first,rv);
}
if( rest != null ){
insert(rv,rest,value);
}
else{
rv.put(first,value);
}
}
public Map blowItOut(Map m){
Map rv = new HashMap();
for( Iterator it = m.keySet().iterator(); it.hasNext(); ){
String k = (String)it.next();
String v = (String)m.get(k);
insert(rv,k,v);
}
return rv;
}
public void go(){
Map x = new HashMap();
Map top = null;
x.put("a.b.c.d","abcd");
x.put("e.f.g","efgh");
x.put("h.i.j.k.l.m.n.o.p","hijklmnop");
x.put("q.r.s","qrs");
x.put("t.u.v","tuv");
x.put("w.x.y.and.z","wxyandz");
top = blowItOut(x);
System.out.println(x);
System.out.println(top);
}
public static void main(String[] args) throws Exception {
x y = new x();
y.go();
}
}
--
Mark Diggory
Software Developer
Harvard MIT Data Center
http://www.hmdc.harvard.edu
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