public static boolean execute()

in log4j-core/src/main/java/org/apache/logging/log4j/core/appender/rolling/action/FileRenameAction.java [106:174]
65 lines of code
13 McCabe index (conditional complexity)

    public static boolean execute(final File source, final File destination, final boolean renameEmptyFiles) {
        if (renameEmptyFiles || (source.length() > 0)) {
            final File parent = destination.getParentFile();
            if ((parent != null) && !parent.exists()) {
                // LOG4J2-679: ignore mkdirs() result: in multithreaded scenarios,
                // if one thread succeeds the other thread returns false
                // even though directories have been created. Check if dir exists instead.
                parent.mkdirs();
                if (!parent.exists()) {
                    LOGGER.error("Unable to create directory {}", parent.getAbsolutePath());
                    return false;
                }
            }
            try {
                try {
                    return moveFile(Paths.get(source.getAbsolutePath()), Paths.get(destination.getAbsolutePath()));
                } catch (final IOException exMove) {
                    LOGGER.debug("Unable to move file {} to {}: {} {} - will try to copy and delete",
                            source.getAbsolutePath(), destination.getAbsolutePath(), exMove.getClass().getName(),
                            exMove.getMessage());
                    boolean result = source.renameTo(destination);
                    if (!result) {
                        try {
                            Files.copy(Paths.get(source.getAbsolutePath()), Paths.get(destination.getAbsolutePath()),
                                    StandardCopyOption.REPLACE_EXISTING);
                            try {
                                Files.delete(Paths.get(source.getAbsolutePath()));
                                result = true;
                                LOGGER.trace("Renamed file {} to {} using copy and delete",
                                        source.getAbsolutePath(), destination.getAbsolutePath());
                            } catch (final IOException exDelete) {
                                LOGGER.error("Unable to delete file {}: {} {}", source.getAbsolutePath(),
                                        exDelete.getClass().getName(), exDelete.getMessage());
                                try {
                                    result = true;
                                    new PrintWriter(source.getAbsolutePath()).close();
                                    LOGGER.trace("Renamed file {} to {} with copy and truncation",
                                            source.getAbsolutePath(), destination.getAbsolutePath());
                                } catch (final IOException exOwerwrite) {
                                    LOGGER.error("Unable to overwrite file {}: {} {}",
                                            source.getAbsolutePath(), exOwerwrite.getClass().getName(),
                                            exOwerwrite.getMessage());
                                }
                            }
                        } catch (final IOException exCopy) {
                            LOGGER.error("Unable to copy file {} to {}: {} {}", source.getAbsolutePath(),
                                    destination.getAbsolutePath(), exCopy.getClass().getName(), exCopy.getMessage());
                        }
                    } else {
                        LOGGER.trace("Renamed file {} to {} with source.renameTo",
                                source.getAbsolutePath(), destination.getAbsolutePath());
                    }
                    return result;
                }
            } catch (final RuntimeException ex) {
                LOGGER.error("Unable to rename file {} to {}: {} {}", source.getAbsolutePath(),
                        destination.getAbsolutePath(), ex.getClass().getName(), ex.getMessage());
            }
        } else {
            try {
                source.delete();
            } catch (final Exception exDelete) {
                LOGGER.error("Unable to delete empty file {}: {} {}", source.getAbsolutePath(),
                        exDelete.getClass().getName(), exDelete.getMessage());
            }
        }

        return false;
    }