DevFaqLookupGenerics
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(→How do I use Java Generics with Lookup?) |
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As of NetBeans 6, a number of convenience methods have been added to lookup, and support for Java generics has been added to Lookup. The following are differences (assume that <code>lkp</code> is a [[DevFaqLookup| <tt>Lookup</tt>]]): | As of NetBeans 6, a number of convenience methods have been added to lookup, and support for Java generics has been added to Lookup. The following are differences (assume that <code>lkp</code> is a [[DevFaqLookup| <tt>Lookup</tt>]]): | ||
| - | {| border=1 class="simple" | + | {| border=1 class="simple" cellpadding="20" cellspacing="0" style="background-color:#FFF9EF;" |
! NB 5.x Code | ! NB 5.x Code | ||
! NB 6 Code | ! NB 6 Code | ||
| Line 21: | Line 21: | ||
Collection c = r.allInstances();</tt> | Collection c = r.allInstances();</tt> | ||
| <tt>Collection<? extends X> c = lkp.lookupAll(X.class);</tt> | | <tt>Collection<? extends X> c = lkp.lookupAll(X.class);</tt> | ||
| + | |- | ||
| + | |<tt>Lookup.Template t = new Lookup.Template(X.class);<br/> | ||
| + | Lookup.Result r = lkp.lookup(t);<br/> | ||
| + | Collection c = r.allInstances(); <br/></tt> | ||
| + | <tt>for (Iterator it=c.iterator(); it.hasNext();) { | ||
| + | X x = (X) it.next();<br/> | ||
| + | //do something with x<br/> | ||
| + | }</tt> | ||
| + | |<tt>for (X x : lkp.lookupAll(X.class)) { | ||
| + | //do something with x<br/> | ||
| + | }</tt> | ||
|} | |} | ||
| - | + | <br/> | |
Generics work well with JDK-5-style for-loops: | Generics work well with JDK-5-style for-loops: | ||
Current revision as of 00:29, 19 February 2010
How do I use Java Generics with Lookup?
As of NetBeans 6, a number of convenience methods have been added to lookup, and support for Java generics has been added to Lookup. The following are differences (assume that lkp is a Lookup):
| NB 5.x Code | NB 6 Code |
|---|---|
| DataObject dob = (DataObject) lkp.lookup(DataObject.class) | DataObject dob = lkp.lookup(DataObject.class) |
| Lookup.Result r = lkp.lookup(new Lookup.Template(X.class)) | Lookup.Result<? extends X> r = lkp.lookupResult(X.class) |
| Collection c = r.allInstances() | Collection<? extends X> c = r.allInstances() |
| Lookup.Template t = new Lookup.Template(X.class);
Lookup.Result r = lkp.lookup(t); | Collection<? extends X> c = lkp.lookupAll(X.class); |
| Lookup.Template t = new Lookup.Template(X.class); Lookup.Result r = lkp.lookup(t); | for (X x : lkp.lookupAll(X.class)) {
//do something with x |
Generics work well with JDK-5-style for-loops:
for (SomeService s : Lookup.getDefault().lookupAll(SomeService.class)) {
// ...
}
