public static File appendSuffix(File file, String suffix) throws IOException {
if (file == null) {
Throw.ioe(TAG, "File is null.");
return null; // To make static analysis happy
}
checkValidSuffix(suffix);
if (file.getAbsolutePath().endsWith(suffix))
Throw.ioe(TAG, "File already has suffix %s: %s", suffix, file.getAbsolutePath());
return new File(file.getAbsolutePath() + suffix);
}
public static void checkReadableDirectory(File dir) throws IOException {
if (dir == null) {
Throw.ioe(TAG, "Directory object File is null.");
} else {
if (!dir.exists()) Throw.ioe(TAG, "Directory does not exist: " + dir.getAbsolutePath());
if (!dir.isDirectory()) Throw.ioe(TAG, "Not a directory: " + dir.getAbsolutePath());
if (!dir.canRead()) Throw.ioe(TAG, "No read permission: " + dir.getAbsolutePath());
if (!dir.canExecute())
Throw.ioe(TAG, "No execute (access files) permission: " + dir.getAbsolutePath());
}
}
public static File replaceSuffix(File file, String newSuffix) throws IOException {
if (file == null) {
Throw.ioe(TAG, "File is null.");
return null; // To make static analysis happy
}
checkValidSuffix(newSuffix);
String currentSuffix = getSuffix(file);
if (newSuffix.equals(currentSuffix))
Throw.ioe(TAG, "File already has suffix %s: %s", newSuffix, file.getAbsolutePath());
String path = file.getAbsolutePath();
String withoutSuffix = StringUtils.removeEnd(path, currentSuffix);
return appendSuffix(new File(withoutSuffix), newSuffix);
}
public static String getSuffix(File file) throws IOException {
if (file == null) {
Throw.ioe(TAG, "File is null.");
return null; // To make static analysis happy
}
String path = file.getAbsolutePath();
String suffix = "." + StringUtils.substringAfterLast(path, ".");
checkValidSuffix(suffix);
return suffix;
}
/** Returns a subdirectory of outer. Creates it if necesssary and checks for write permissions. */
public static synchronized File getSubdir(File outer, String name) throws IOException {
File dir = new File(outer, name);
if (!dir.exists()) {
if (!dir.mkdirs()) {
Throw.ioe(TAG, "Failed to create " + dir.getAbsolutePath());
}
}
checkWritableDirectory(dir);
return dir;
}
public static void checkValidSuffix(String suffix) throws IOException {
if (suffix == null) {
Throw.ioe(TAG, "Suffix is null.");
} else {
if ("".equals(suffix)) Throw.ioe(TAG, "Suffix is empty string.");
if (!suffix.startsWith(".")) Throw.ioe(TAG, "Suffix must start with a dot: \"%s\".", suffix);
if (suffix.length() < 2)
Throw.ioe(TAG, "Suffix \"%s\" is too short. Must be (dot)[a-z]{1,10}.", suffix);
if (suffix.length() > 11)
Throw.ioe(TAG, "Suffix \"%s\" is too long. Must be (dot)[a-z]{1,10}.", suffix);
if (!StringUtils.containsOnly(
suffix.substring(1, suffix.length()), "abcdefghijklmnopqrstuvwxyz"))
Throw.ioe(
TAG, "Suffix \"%s\" contains weird characters. Must be (dot)[a-z]{1,10}.", suffix);
}
}
public static void checkWritableDirectory(File dir) throws IOException {
checkReadableDirectory(dir);
if (!dir.canWrite()) Throw.ioe(TAG, "No write permission: " + dir.getAbsolutePath());
}
