Support merging of XMLs with UberJarMergedResourceBuildItem

[gastaldi]

JarResultBuildStep combines XML files using XmlCombiner

This is a potential solution for quarkiverse/quarkus-cxf#194

[gastaldi]

/cc @shumonsharif

[gastaldi]

I am not sure I like this solution TBH. I think I prefer enhancing UberJarMergedResourceBuildItem to specify the contents to be replaced instead of letting JarResultBuildStep do this job for each special file format (think JSON for example).

I'll provide another PR and we can choose which strategy to choose

[gastaldi]

Actually I think GeneratedResourceBuildItem should be the build item that extension authors should use to replace files in the Uber JAR, like the following:

    @BuildStep
    GeneratedResourceBuildItem uberJarMergedResourceBuildItem() {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos, true);
        try {
            List<URL> resources = Collections
                    .list(getClass().getClassLoader().getResources("META-INF/cxf/bus-extensions.txt"));
            for (URL resource : resources) {
                try (InputStream is = resource.openStream();
                     BufferedReader reader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8))) {
                    reader.lines().forEach(ps::println);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return new GeneratedResourceBuildItem("META-INF/cxf/bus-extensions.txt", baos.toByteArray());
    }

[gastaldi]

Closing this as I didn't like this approach and JarResultStep should honor the GeneratedResourceBuildItems. See #17199 for more detail

[quarkus-bot]

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