BRABANT Benjamin created DIGESTER-176:
-----------------------------------------
Summary: [Digester] Problem when adding multiple FactoryCreateRule
for the same pattern
Key: DIGESTER-176
URL: https://issues.apache.org/jira/browse/DIGESTER-176
Project: Commons Digester
Issue Type: Bug
Affects Versions: 3.2
Environment: Operating System : Windows 7 x32 bits
Reporter: BRABANT Benjamin
Priority: Minor
Hello,
I actually use digester API in a project in which I have to initialize
components of a system according to an XML configuration. The complete
ClassName of the factories in charge of loading the associated components is
specified in the configuration file (hereinbelow a simplified example). Thus,
the loader class in charge of loading components, read the XML file and, thanks
to the {{overriddenByAttribute(String attributeName)}} function provided by the
{{FactoryCreateBuilder}} class, execute the right factory method specified by
the XML "factory" attribute.
A problem appeared when I try to load several components of the same type (=>
same XML pattern) which are initialized from different factories (below the
sample to illustrate the description !).
*XML Config File :*
{quote}
<loader>
<components>
<collectors>
<collector id="collector" class="foo.bar.DefaultCollector"
factory="foo.bar.DefaultCollectorFactory" /> <!-- The first collector component
to load -->
<collector id="command" class="foo.bar.CommandCollector"
factory="foo.bar.CommandCollectorFactory" /> <!-- The second collector
component to load -->
</collectors>
<analyzers>
<analyzer id="analyzer" class="foo.baz.DefaultAnalyzer"
factory="foo.baz.DefaultAnalyzerFactory" /> <!-- The only analyzer component to
load -->
</analyzers>
</components>
</loader>
{quote}
*AbstractRulesModule Implementation :*
{quote}
package foo;
import org.apache.commons.digester3.binder.AbstractRulesModule;
public class LoaderConfigurationModule extends AbstractRulesModule {
\@Override
protected void configure() \{
forPattern("loader/components/collectors/collector")
.factoryCreate().ofType(AbstractCollectorFactory.class).overriddenByAttribute("factory")
.setNext("addCollector");
forPattern("loader/components/analyzers/analyzer")
.factoryCreate().ofType(AbstractAnalyzerFactory.class).overriddenByAttribute("factory")
.setNext("addAnalyzer");
\}
}
{quote}
When I execute the Digester.parse() method (after passing on the
LoaderConfigurationModule to the DigesterLoader), I obtain the result below :
{quote}
2013-06-10 [main] INFO - Loading Collector [class foo.bar.DefaultCollector]...
2013-06-10 [main] INFO - Loading Collector [class foo.bar.DefaultCollector]...
2013-06-10 [main] INFO - Loading Analyzer [class foo.baz.DefaultAnalyzer]...
{quote}
In fact, when having the same pattern (here
_loader/components/collectors/collector_) for multiple creation factories, the
digester only use the first instance for the pattern (in this case
foo.bar.DefaultCollectorFactory]. We realize that the Analyzer which is
associated with another pattern is correctly initialized.
I hope being clear in my explanation, thus I would like you (please :) ) to
explain me if I am doing a mistake in my code or if it's really a bug in the
digester and if you have an idea to solve that. I am trying to find a solution
too, but being new in this project, it is not very easy for me. I will post my
find in case of success in my search !
Thanks for reading and sorry for my bad english !
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