Class StringUtil

java.lang.Object
org.jsoup.internal.StringUtil

public final class StringUtil
extends Object
A minimal String utility class. Designed for internal jsoup use only.
  • Constructor Details

  • Method Details

    • join

      public static String join​(Collection strings, String sep)
      Join a collection of strings by a separator
      Parameters:
      strings - collection of string objects
      sep - string to place between strings
      Returns:
      joined string
    • join

      public static String join​(Iterator strings, String sep)
      Join a collection of strings by a separator
      Parameters:
      strings - iterator of string objects
      sep - string to place between strings
      Returns:
      joined string
    • join

      public static String join​(String[] strings, String sep)
      Join an array of strings by a separator
      Parameters:
      strings - collection of string objects
      sep - string to place between strings
      Returns:
      joined string
    • padding

      public static String padding​(int width)
      Returns space padding (up to a max of 30).
      Parameters:
      width - amount of padding desired
      Returns:
      string of spaces * width
    • isBlank

      public static boolean isBlank​(String string)
      Tests if a string is blank: null, empty, or only whitespace (" ", \r\n, \t, etc)
      Parameters:
      string - string to test
      Returns:
      if string is blank
    • isNumeric

      public static boolean isNumeric​(String string)
      Tests if a string is numeric, i.e. contains only digit characters
      Parameters:
      string - string to test
      Returns:
      true if only digit chars, false if empty or null or contains non-digit chars
    • isWhitespace

      public static boolean isWhitespace​(int c)
      Tests if a code point is "whitespace" as defined in the HTML spec. Used for output HTML.
      Parameters:
      c - code point to test
      Returns:
      true if code point is whitespace, false otherwise
      See Also:
      isActuallyWhitespace(int)
    • isActuallyWhitespace

      public static boolean isActuallyWhitespace​(int c)
      Tests if a code point is "whitespace" as defined by what it looks like. Used for Element.text etc.
      Parameters:
      c - code point to test
      Returns:
      true if code point is whitespace, false otherwise
    • isInvisibleChar

      public static boolean isInvisibleChar​(int c)
    • normaliseWhitespace

      public static String normaliseWhitespace​(String string)
      Normalise the whitespace within this string; multiple spaces collapse to a single, and all whitespace characters (e.g. newline, tab) convert to a simple space
      Parameters:
      string - content to normalise
      Returns:
      normalised string
    • appendNormalisedWhitespace

      public static void appendNormalisedWhitespace​(StringBuilder accum, String string, boolean stripLeading)
      After normalizing the whitespace within a string, appends it to a string builder.
      Parameters:
      accum - builder to append to
      string - string to normalize whitespace within
      stripLeading - set to true if you wish to remove any leading whitespace
    • in

      public static boolean in​(String needle, String... haystack)
    • inSorted

      public static boolean inSorted​(String needle, String[] haystack)
    • isAscii

      public static boolean isAscii​(String string)
      Tests that a String contains only ASCII characters.
      Parameters:
      string - scanned string
      Returns:
      true if all characters are in range 0 - 127
    • resolve

      public static URL resolve​(URL base, String relUrl) throws MalformedURLException
      Create a new absolute URL, from a provided existing absolute URL and a relative URL component.
      Parameters:
      base - the existing absolute base URL
      relUrl - the relative URL to resolve. (If it's already absolute, it will be returned)
      Returns:
      the resolved absolute URL
      Throws:
      MalformedURLException - if an error occurred generating the URL
    • resolve

      public static String resolve​(String baseUrl, String relUrl)
      Create a new absolute URL, from a provided existing absolute URL and a relative URL component.
      Parameters:
      baseUrl - the existing absolute base URL
      relUrl - the relative URL to resolve. (If it's already absolute, it will be returned)
      Returns:
      an absolute URL if one was able to be generated, or the empty string if not
    • borrowBuilder

      public static StringBuilder borrowBuilder()
      Maintains cached StringBuilders in a flyweight pattern, to minimize new StringBuilder GCs. The StringBuilder is prevented from growing too large.

      Care must be taken to release the builder once its work has been completed, with releaseBuilder(java.lang.StringBuilder)

      Returns:
      an empty StringBuilder
    • releaseBuilder

      public static String releaseBuilder​(StringBuilder sb)
      Release a borrowed builder. Care must be taken not to use the builder after it has been returned, as its contents may be changed by this method, or by a concurrent thread.
      Parameters:
      sb - the StringBuilder to release.
      Returns:
      the string value of the released String Builder (as an incentive to release it!).