org.apache.uima.pear.util

## Class StringUtil

- java.lang.Object
- - org.apache.uima.pear.util.StringUtil

-     public class StringUtil
      extends Object

  The `StringUtil` class provides utility methods for working with strings.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `StringUtil()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static Properties` | `appendProperties(Properties source, Properties plus, boolean override)` Appends properties specified in a given 'plus' object to a given 'source' object.
    `static int` | `countWords(String text)`
    `static String` | `errorStackTraceContent(Throwable error)` Return the content of the stack trace for a given `Throwable` object.
    `static String` | `extractTextFromMarkup(String mString)`
    `static String` | `getPlainClassName(Class<?> aClass)` Returns a plain name (without package name) of a given Java `Class`.
    `static int` | `indexOfIgnoreCase(String mainStr, String argStr)`
    `static int` | `indexOfIgnoreCase(String mainStr, String argStr, int fromIndex)`
    `static boolean` | `isLowerCase(String string)`
    `static boolean` | `isUpperCase(String string)`
    `static String` | `toRegExpReplacement(String string)` Converts a given input string to another string that can be used as a 'replacement' string in the `String::replaceAll(String regex, String replacement)` method.
    `static String` | `toRegExpString(String string)` Converts a given input string to another string that can be used in all 'regular expression' methods.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### StringUtil

          public StringUtil()

  - ### Method Detail

    - #### appendProperties

          public static Properties appendProperties(Properties source,
                                                    Properties plus,
                                                    boolean override)

      Appends properties specified in a given 'plus' object to a given 'source' object. If the 'override' flag is `true`, the 'plus' properties will override the 'source' properties with the same name, otherwise the 'source' properties will stay.
      Parameters:
        `source` - The given 'source' properties object.
        `plus` - The given 'plus' properties object.
        `override` - If this flag is `true`, the 'plus' properties will override the 'source' properties with the same name, otherwise the 'source' properties will stay.
      Returns:
        The properties object, containing both the given 'source' properties and the given 'plus' properties.

    - #### countWords

          public static int countWords(String text)

      Parameters:
        `text` - The given string.
      Returns:
        The number of words in a given string.

    - #### errorStackTraceContent

          public static String errorStackTraceContent(Throwable error)

      Return the content of the stack trace for a given `Throwable` object.
      Parameters:
        `error` - The given `Throwable` object.
      Returns:
        The content of the stack trace for the given error.

    - #### extractTextFromMarkup

          public static String extractTextFromMarkup(String mString)

      Parameters:
        `mString` - The given markup string.
      Returns:
        Text extracted from a given markup string.

    - #### getPlainClassName

          public static String getPlainClassName(Class<?> aClass)

      Returns a plain name (without package name) of a given Java `Class`.
      Parameters:
        `aClass` - The given Java `Class`.
      Returns:
        The plain name (without package name) of the given Java `Class`.

    - #### isLowerCase

          public static boolean isLowerCase(String string)

      Parameters:
        `string` - The given string.
      Returns:
        `true`, if all characters in a given string are lowercase letters, `false` otherwise.

    - #### isUpperCase

          public static boolean isUpperCase(String string)

      Parameters:
        `string` - The given string.
      Returns:
        `true`, if all characters in a given string are uppercase letters, `false` otherwise.

    - #### indexOfIgnoreCase

          public static int indexOfIgnoreCase(String mainStr,
                                              String argStr)

      Parameters:
        `mainStr` - The given string object.
        `argStr` - The given string argument.
      Returns:
        If the given string argument occurs as a substring, ignoring case, within the given string object, then the index of the first character of the first such substring is returned; if it does not occur as a substring, `-1` is returned.

    - #### indexOfIgnoreCase

          public static int indexOfIgnoreCase(String mainStr,
                                              String argStr,
                                              int fromIndex)

      Parameters:
        `mainStr` - The given string object.
        `argStr` - The given string argument.
        `fromIndex` - The index to start the search from.
      Returns:
        If the given string argument occurs as a substring, ignoring case, within the given string object at a starting index no smaller than `fromIndex`, then the index of the first character of the first such substring is returned; if it does not occur as a substring starting at `fromIndex` or beyond, `-1` is returned.

    - #### toRegExpReplacement

          public static String toRegExpReplacement(String string)

      Converts a given input string to another string that can be used as a 'replacement' string in the `String::replaceAll(String regex, String replacement)` method.
      Characters to be escaped are: "\ $".
      Parameters:
        `string` - The given input string.
      Returns:
        The string that can be used as a 'replacement' string in the `String::replaceAll(String regex, String replacement)` method.

    - #### toRegExpString

          public static String toRegExpString(String string)

      Converts a given input string to another string that can be used in all 'regular expression' methods.
      Characters to be escaped are: "\ . $ ^ { [ ( | ) * + ?".
      Parameters:
        `string` - The given input string.
      Returns:
        The string that can be used in 'regular expression' methods.

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