rdonkin 2004/01/07 14:01:09
Modified: beanutils/src/java/org/apache/commons/beanutils package.html
Log:
Added entry to FAQ about ordering bean comparator.
Revision Changes Path
1.18 +24 -0
jakarta-commons/beanutils/src/java/org/apache/commons/beanutils/package.html
Index: package.html
===================================================================
RCS file:
/home/cvs/jakarta-commons/beanutils/src/java/org/apache/commons/beanutils/package.html,v
retrieving revision 1.17
retrieving revision 1.18
diff -u -r1.17 -r1.18
--- package.html 17 Sep 2003 20:23:22 -0000 1.17
+++ package.html 7 Jan 2004 22:01:09 -0000 1.18
@@ -53,6 +53,7 @@
<li><a href="#FAQ">Frequently Asked Questions</a>
<ul>
<li><a href="#FAQ.property">Why Can't BeanUtils Find My Method?</a></li>
+ <li><a href="#FAQ.bc.order">How Do I Set The BeanComparator Order To Be
Ascending/Descending?</a></li>
</ul></li>
</ol>
@@ -808,5 +809,28 @@
create your own <em>BeanInfo</em>.</li>
</ul>
</p>
+<a name="FAQ.bc.order"></a>
+<h3>How Do I Set The BeanComparator Order To Be Ascending/Descending?</h3>
+<p>
+BeanComparator relies on an internal Comparator to perform the actual
+comparisions. By default,
+<code>org.apache.commons.collections.comparators.ComparableComparator</code>
+is used which imposes a natural order. If you want to change the order,
+then a custom Comparator should be created and passed into the
+appropriate constructor.
+</p>
+<p>
+For example:
+</p>
+<code><pre>
+ import org.apache.commons.collections.comparators.ComparableComparator;
+ import org.apache.commons.collections.comparators.ReverseComparator;
+ import org.apache.commons.beanutils.BeanComparator;
+ ...
+ BeanComparator reversedNaturalOrderBeanComparator
+ = new BeanComparator("propertyName", new ReverseComparator(new
ComparableComparator()));
+ Collections.sort(myList, reversedNaturalOrderBeanComparator);
+ ...
+</pre></code>
</body>
</html>
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