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How do I determine the stale resources in a Mojo to avoid reprocessing them?

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This can be done using the following piece of code:

// Imports needed
import org.codehaus.plexus.compiler.util.scan.InclusionScanException;
import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
import org.codehaus.plexus.compiler.util.scan.mapping.SuffixMapping;

// At some point of your code
StaleSourceScanner scanner = new StaleSourceScanner( 0, Collections.singleton( "**/*.xml" ), Collections.EMPTY_SET );
scanner.addSourceMapping( new SuffixMapping( ".xml", ".html" ) );
Set<File> staleFiles = (Set<File>) scanner.getIncludedSources( this.sourceDirectory, this.targetDirectory );

The second parameter to the StaleSourceScanner is the set of includes, while the third parameter is the set of excludes. You must add a source mapping to the scanner (second line). In this case we're telling the scanner what is the extension of the result file (.html) for each source file extension (.xml). Finally we get the stale files as a Set<File> calling the getIncludedSources method, passing as parameters the source and target directories (of type File). The Maven API doesn't support generics, but you may cast it that way if you're using them.
In order to use this API you must include the following dependency in your pom:

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