/**
* Concatenates the given objects into a single {@code String}. This method is more efficient than
* concatenating using "+", since only one <code>{@link StringBuilder}</code> is created.
*
* @param objects the objects to concatenate.
* @return a {@code String} containing the given objects.
*/
public static String concat(Object... objects) {
if (Arrays.isNullOrEmpty(objects)) {
return null;
}
StringBuilder b = new StringBuilder();
for (Object o : objects) {
b.append(o);
}
return b.toString();
}
/**
* Format with {@link String#format(String, Object...)} the given message iif some args have been
* given otherwise juts return the message.
*
* @param message the string to format
* @param args args used to format the message, can be null or empty
* @return the formatted string if any args were given
*/
public static String formatIfArgs(String message, Object... args) {
return Arrays.isNullOrEmpty(args)
// here we need to format %n but not other % since we do not have arguments. %% is formatted
// to % so
// replacing % into %% and then format it will have no effect. Nevertheless, we want to
// format %n
// correctly so we replace all % to %% except if they are followed by a 'n'.
? format(message.replaceAll("%([^n])", "%%$1"))
: format(message, args);
}
/**
* Specifies the delimiter to use to join {@code String}s.
*
* @param delimiter the delimiter to use.
* @return the {@code String}s joined using the given delimiter.
*/
public String with(String delimiter, String escapeString) {
if (delimiter == null) {
throw new IllegalArgumentException("Delimiter should not be null");
}
if (Arrays.isNullOrEmpty(strings)) {
return "";
}
String escape = escapeString == null ? "" : escapeString;
StringBuilder b = new StringBuilder();
int stringCount = strings.length;
for (int i = 0; i < stringCount; i++) {
String s = strings[i];
if (s != null) {
b.append(escape);
b.append(s);
b.append(escape);
}
if (i < stringCount - 1) {
b.append(delimiter);
}
}
return b.toString();
}
