private void copySource()

in src/main/java/org/apache/tomee/website/Javadocs.java [200:230]
27 lines of code
4 McCabe index (conditional complexity)

    private void copySource(final Source parent, final Source source, final File javaSources) {
        final JavadocSources javadocSources = new JavadocSources();
        source.setComponent(JavadocSources.class, javadocSources);

        final Predicate<String> wanted = wanted(parent, source);

        try {
            java.nio.file.Files.walk(source.getDir().toPath())
                    .map(Path::toFile)
                    .filter(File::isFile)
                    .filter(this::isJava)
                    .filter(source.getJavadocFilter()::include)
                    .filter(source.getJavadocFilter()::exclude)
                    .forEach(file -> {
                        try {
                            final String relativePath = file.getAbsolutePath().replace(File.separatorChar, '/').replaceAll(".*/src/main/java/", "");

                            if (!wanted.test(relativePath)) return;

                            final File dest = new File(javaSources, relativePath);
                            Files.mkdirs(dest.getParentFile());
                            IO.copy(file, dest);
                            javadocSources.add(new JavadocSource(relativePath, dest));
                        } catch (IOException e) {
                            throw new IllegalStateException(e);
                        }
                    });
        } catch (IOException e) {
            throw new IllegalStateException("Failed to aggregate java sources");
        }
    }