protected synchronized void onFilesChanged()

in filemonitor/src/main/java/org/apache/servicemix/kernel/filemonitor/FileMonitor.java [226:300]
64 lines of code
17 McCabe index (conditional complexity)

    protected synchronized void onFilesChanged(Collection<String> filenames) {
        bundlesToStart.clear();
        bundlesToUpdate.clear();
        Set<File> bundleJarsCreated = new HashSet<File>();

        for (String filename : filenames) {
            File file = new File(filename);
            try {
                LOGGER.debug("File changed: " + filename);

                // Handle config files
                if (isValidConfigFile(file)) {
                    if (file.exists()) {
                        updateConfiguration(file);
                    } else {
                        deleteConfiguration(file);
                    }
                    continue;
                }

                // Handle exploded artifacts removal
                if (!file.exists() && file.getName().equals("MANIFEST.MF")) {
                    File parentFile = file.getParentFile();
                    if (parentFile.getName().equals("META-INF")) {
                        File bundleDir = parentFile.getParentFile();
                        if (isValidBundleSourceDirectory(bundleDir)) {
                            undeployBundle(bundleDir);
                            continue;
                        }
                    }
                }

                // Handle exploded artifacts add
                File jardir = getExpandedBundleRootDirectory(file);
                if (jardir != null) {
                    if (bundleJarsCreated.contains(jardir)) {
                        continue;
                    }
                    bundleJarsCreated.add(jardir);
                    file = createBundleJar(jardir);
                }

                // Transformation step
                if (file.exists()) {
                    File f = transformArtifact(file);
                    if (f == null) {
                        LOGGER.warn("Unsupported deployment: " + filename);
                        rescheduleTransformation(file);
                        continue;
                    }
                    file = f;
                } else {
                    String transformedFile = artifactToBundle.get(filename);
                    if (transformedFile != null) {
                        file = new File(transformedFile);
                        if (file.exists()) {
                            file.delete();
                        }
                    }
                }

                // Handle final bundles
                if (isValidArtifactFile(file)) {
                    if (file.exists()) {
                        deployBundle(file);
                    } else {
                        undeployBundle(file);
                    }
                }
            } catch (Exception e) {
                LOGGER.warn("Failed to process: " + file + ". Reason: " + e, e);
            }
        }
        refreshPackagesAndStartOrUpdateBundles();
    }