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package pl.jalokim.utils.string;
import java.util.Collection;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import static java.util.Arrays.asList;
import static java.util.Collections.nCopies;
import static pl.jalokim.utils.constants.Constants.EMPTY;
import static pl.jalokim.utils.constants.Constants.NEW_LINE;
import static pl.jalokim.utils.constants.Constants.TAB;
/**
* Utils methods for String.
*/
public final class StringUtils {
private StringUtils() {
}
/**
* Check that text is empty or null.
*
* @param text to check.
* @return boolean value
*/
public static boolean isEmpty(String text) {
return text == null || text.isEmpty();
}
/**
* Check that text is not empty.
*
* @param text to check.
* @return boolean value
*/
public static boolean isNotEmpty(String text) {
return !isEmpty(text);
}
/**
* If whole text contains only white signs then return true.
*
* @param text to check.
* @return boolean value
*/
public static boolean isBlank(String text) {
return text == null || isBlank(text.toCharArray());
}
private static boolean isBlank(char... chars) {
boolean result = true;
for (char aChar : chars) {
result = result && Character.isWhitespace(aChar);
if (!result) {
break;
}
}
return result;
}
/**
* If whole text doesn't contain only white signs then return true.
*
* @param text to check.
* @return boolean value
*/
public static boolean isNotBlank(String text) {
return !isBlank(text);
}
/**
* Return concatenated text all list elements as new lines.
*
* @param elements to concatenate
* @return concatenated text.
*/
public static String concatElementsAsLines(List elements) {
return concatElements(elements, NEW_LINE);
}
/**
* Return concatenated text all array elements as new lines.
*
* @param elements to concatenate
* @return concatenated text.
*/
public static String concatElementsAsLines(Object... elements) {
return concatElements(asList(elements), NEW_LINE);
}
/**
* Return concatenated text from mapped all array elements to text as new lines.
*
* @param elements to concatenate
* @return concatenated text.
*/
public static String concatElementsAsLines(Function mapper, E... elements) {
return concatElements(asList(elements), mapper, NEW_LINE);
}
/**
* Return concatenated text all list elements as new lines.
*
* @param elements to concatenate
* @param mapper for from E type to string
* @param generic type for
* @return concatenated text.
*/
public static String concatElementsAsLines(List elements, Function mapper) {
return concatElements(elements,
mapper,
NEW_LINE);
}
/**
* It return N times of tabulator.
*
* @param tabsNumber number of Tabs
* @return created n times tabs.
*/
public static String tabsNTimes(int tabsNumber) {
return repeatTextNTimes(tabsNumber, TAB);
}
/**
* It create text with n times repeated text.
*
* @param nTimes number to repeat
* @param text value to repeat
* @return created n times text.
*/
public static String repeatTextNTimes(int nTimes, String text) {
return String.join(EMPTY, nCopies(nTimes, text));
}
/**
* Concatenate elements with empty text. On every object will be called toString().
*
* @param collection elements to concatenate
* @param generic type of collection.
* @return concatenated text.
*/
public static String concatElements(Collection collection) {
return concatElements(collection, EMPTY);
}
/**
* Concatenate elements with empty text with mapper from E type to String.
*
* @param collection elements to concatenate
* @param mapper from some type to String
* @param generic type of collection.
* @return concatenated text.
*/
public static String concatElements(Collection collection, Function mapper) {
return concatElements(collection, mapper, EMPTY);
}
/**
* Concatenate elements with joinText value.
*
* @param collection elements to concatenate
* @param joinText value between all texts.
* @param generic type of collection.
* @return concatenated text.
*/
public static String concatElements(Collection collection, String joinText) {
return concatElements(collection, Object::toString, joinText);
}
/**
* Concatenate elements with joinText value with mapper from E type to String.
*
* @param collection elements to concatenate
* @param mapper from some type to String
* @param joinText value between all texts.
* @param generic type of collection.
* @return concatenated text.
*/
public static String concatElements(Collection collection, Function mapper, String joinText) {
return concatElements(EMPTY, collection, mapper, joinText, EMPTY);
}
/**
* Concatenate elements with prefix, join text between all elements and with suffix value with mapper from E type to String.
*
* @param textPrefix text before all concatenated text
* @param collection elements to concatenate
* @param mapper from some type to String
* @param joinText value between all texts.
* @param textSuffix text after all concatenated text
* @param generic type of collection.
* @return concatenated text with empty text.
*/
public static String concatElements(String textPrefix, Collection collection, Function mapper,
String joinText, String textSuffix) {
return textPrefix.concat(collection.stream()
.map(mapper)
.collect(Collectors.joining(joinText))
).concat(textSuffix);
}
/**
* This method concatenate all texts from array with join Text.
*
* @param joinText between all varargs.
* @param texts varargs for text.
* @return concatenated text
*/
public static String concatElements(String joinText, String... texts) {
return concatElements(asList(texts), joinText);
}
/**
* concatenate all elements with empty string value.
*
* @param texts to concatenate
* @return concatenated text
*/
public static String concat(String... texts) {
return concatElements(asList(texts), EMPTY);
}
}
