[Commented] (DOXIA-614) Support obtaining the source reference in a Doxia Parser

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[Commented] (DOXIA-614) Support obtaining the source reference in a Doxia Parser

Piotr Zygielo (Jira)

    [ https://issues.apache.org/jira/browse/DOXIA-614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148937#comment-17148937 ]

ASF GitHub Bot commented on DOXIA-614:

abelsalgadoromeroWD commented on a change in pull request #35:
URL: https://github.com/apache/maven-doxia/pull/35#discussion_r447950882

File path: doxia-core/src/main/java/org/apache/maven/doxia/parser/AbstractParser.java
@@ -37,6 +29,13 @@
 import org.apache.maven.doxia.sink.Sink;
 import org.codehaus.plexus.component.annotations.Requirement;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.Properties;

Review comment:
       It's by Intellij, I'll restore it in a commit. I have noted many other things that even with the style configured as described in https://maven.apache.org/developers/conventions/code.html#intellij-idea. For example exception below the method definition are indented at 8 spaces while the original code is at 4.
   I try to keep some things that I see, but some may slipt, sorry.

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> Support obtaining the source reference in a Doxia Parser
> --------------------------------------------------------
>                 Key: DOXIA-614
>                 URL: https://issues.apache.org/jira/browse/DOXIA-614
>             Project: Maven Doxia
>          Issue Type: Improvement
>          Components: Core, Modules, Site Renderer (moved to DOXIASITETOOLS)
>    Affects Versions: 1.9.1
>            Reporter: Abel Salgado Romero
>            Priority: Major
> Currently, the 'org.apache.maven.doxia.parser.Parser' interface provides 2 methods that parsers can implement, one with and the other without the source reference. However, in reality the one with the reference added in DOXIA-224 is never invoked, thus making it unusable from maven-site-plugin.
> Methods are:
>  * void parse( Reader source, Sink sink )
>  * void parse( Reader source, Sink sink, String reference )
> 1. Base implementation 'org.apache.maven.doxia.parser.AbstractParser' ('doxia-core') of the reference method calls the other, removing the reference if it is provided.
> {code:java}
>  public void parse( Reader source, Sink sink, String reference )
>  throws ParseException
>  {
>  parse( source, sink );
>  }{code}
> 2. In 'org.apache.maven.doxia.DefaultDoxia#parse' ('doxia-core') the parser method 'parser (reader, sink)' is called at the end, which means 'parser(reader, sink, reference)' is never used.
> {code:java}
> public void parse( Reader source, String parserId, Sink sink )
>  throws ParserNotFoundException, ParseException
>  {
>   Parser parser = parserManager.getParser( parserId );
>   parser.enableLogging( new PlexusLoggerWrapper( getLogger() ) );
>   parser.parse( source, sink );
>  }
> {code}
> 3. 'org.apache.maven.doxia.Doxia#parse(Reader source, String parserId, Sink sink )' and it's implementation 'DefaultDoxia' ('doxia-core') does not receive the source reference, so it cannot pass it in any way.
> For these 3 reasons, 'org.apache.maven.doxia.siterenderer.DefaultSiteRenderer#renderDocument' ('doxia-sitetools') who has the source reference is not able to pass it to the above components.
> To sum up, the chaing of calls is: DefaultSiteRenderer -> Doxia/DefaultDoxia -> Parser implementation (e.g. AbstractParser)
> After discussion with [~hboutemy] the proposal is to fix it in several steps to avoid using SNAPSHOTS and ensure no breaking points:
>  # Change doxia-core components to support new method with "reference", still having both methods. This means, changing AbstractParser and it's implementations to recieve the "reference". This does not break anything since no one is using this param now.
>  # Change doxia-sitetools's 'DefaultSiteRenderer' component to pass the reference to Doxia/DefautDoxia DOXIASITETOOLS-225.
>  # Release new doxia-sitetools version.
>  # Once released, modifty doxia-core components to pass the reference and remove the (Reader, Sink)  method completely. Also, in advance that Parsers may need more information about the source, instead of passing "String reference", we will pass a new class "SourceMetadata" that encapsulates the "String reference. That way we can add more information in the future if needed.

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