private static void copyDirectoryStructure()

in src/main/java/org/apache/maven/shared/utils/io/FileUtils.java [1528:1591]
48 lines of code
13 McCabe index (conditional complexity)

    private static void copyDirectoryStructure(
            @Nonnull File sourceDirectory,
            @Nonnull File destinationDirectory,
            File rootDestinationDirectory,
            boolean onlyModifiedFiles)
            throws IOException {
        //noinspection ConstantConditions
        if (sourceDirectory == null) {
            throw new IOException("source directory can't be null.");
        }

        //noinspection ConstantConditions
        if (destinationDirectory == null) {
            throw new IOException("destination directory can't be null.");
        }

        if (sourceDirectory.equals(destinationDirectory)) {
            throw new IOException("source and destination are the same directory.");
        }

        if (!sourceDirectory.exists()) {
            throw new IOException("Source directory doesn't exist (" + sourceDirectory.getAbsolutePath() + ").");
        }

        File[] files = sourceDirectory.listFiles();

        if (files == null) {
            return;
        }

        String sourcePath = sourceDirectory.getAbsolutePath();

        for (File file : files) {
            if (file.equals(rootDestinationDirectory)) {
                // We don't copy the destination directory in itself
                continue;
            }

            String dest = file.getAbsolutePath();

            dest = dest.substring(sourcePath.length() + 1);

            File destination = new File(destinationDirectory, dest);

            if (file.isFile()) {
                destination = destination.getParentFile();

                if (onlyModifiedFiles) {
                    copyFileToDirectoryIfModified(file, destination);
                } else {
                    copyFileToDirectory(file, destination);
                }
            } else if (file.isDirectory()) {
                if (!destination.exists() && !destination.mkdirs()) {
                    throw new IOException(
                            "Could not create destination directory '" + destination.getAbsolutePath() + "'.");
                }

                copyDirectoryStructure(file, destination, rootDestinationDirectory, onlyModifiedFiles);
            } else {
                throw new IOException("Unknown file type: " + file.getAbsolutePath());
            }
        }
    }