javax.jdo.query

## Interface StringExpression

- All Superinterfaces:
    ComparableExpression<String>, Expression<String>

      public interface StringExpression
      extends ComparableExpression<String>

  Representation of a string in a query.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `StringExpression` | `add(Expression expr)` Method to return an expression for this expression added to the passed expression (String concatenation).
    `StringExpression` | `add(String str)` Method to return an expression for this expression added to the passed string (String concatenation).
    `CharacterExpression` | `charAt(int pos)` Method to return an expression for the character at a position of this string expression.
    `CharacterExpression` | `charAt(NumericExpression<Integer> pos)` Method to return an expression for the character at a position of this string expression.
    `BooleanExpression` | `endsWith(String str)` Method returning an expression for whether this string expression ends with the passed string expression.
    `BooleanExpression` | `endsWith(StringExpression expr)` Method returning an expression for whether this string expression ends with the passed string expression.
    `BooleanExpression` | `equalsIgnoreCase(String str)` Method returning an expression for whether this string expression is equal to (ignoring case) the passed string.
    `BooleanExpression` | `equalsIgnoreCase(StringExpression expr)` Method returning an expression for whether this string expression is equal to (ignoring case) the passed string expression.
    `NumericExpression<Integer>` | `indexOf(String str)` Method to return an expression for the position of the passed string in this string.
    `NumericExpression<Integer>` | `indexOf(StringExpression expr)` Method to return an expression for the position of the passed string in this string.
    `NumericExpression<Integer>` | `indexOf(StringExpression expr, int pos)` Method to return an expression for the position of the passed string in this string after a position.
    `NumericExpression<Integer>` | `indexOf(StringExpression expr, NumericExpression<Integer> pos)` Method to return an expression for the position of the passed string in this string after a position.
    `NumericExpression<Integer>` | `indexOf(String str, int pos)` Method to return an expression for the position of the passed string in this string after a position.
    `NumericExpression<Integer>` | `indexOf(String str, NumericExpression<Integer> pos)` Method to return an expression for the position of the passed string in this string after a position.
    `NumericExpression<Integer>` | `length()` Method returning a expression for the length of this string.
    `BooleanExpression` | `matches(String str)` Method to return an expression for whether this string expression matches the provided string.
    `BooleanExpression` | `matches(StringExpression expr)` Method to return an expression for whether this string expression matches the provided expression.
    `BooleanExpression` | `startsWith(String str)` Method returning an expression for whether this string expression starts with the passed string.
    `BooleanExpression` | `startsWith(StringExpression expr)` Method returning an expression for whether this string expression starts with the passed string expression.
    `BooleanExpression` | `startsWith(StringExpression expr, int index)` Method returning an expression for whether the substring of this string beginning at the specified index starts with the passed string expression.
    `BooleanExpression` | `startsWith(String str, int index)` Method returning an expression for whether the substring of this string beginning at the specified index starts with the passed string.
    `StringExpression` | `substring(int pos)` Method to return an expression for the substring of this string expression.
    `StringExpression` | `substring(int startPos, int endPos)` Method to return an expression for the substring of this string expression.
    `StringExpression` | `substring(NumericExpression<Integer> pos)` Method to return an expression for the substring of this string expression.
    `StringExpression` | `substring(NumericExpression<Integer> startPos, NumericExpression<Integer> endPos)` Method to return an expression for the substring of this string expression.
    `StringExpression` | `toLowerCase()` Method to return a StringExpression representing this string expression in lower case.
    `StringExpression` | `toUpperCase()` Method to return a StringExpression representing this string expression in upper case.
    `StringExpression` | `trim()` Method returning a string expression with whitespace trimmed from start and end.

    - ### Methods inherited from interface javax.jdo.query.ComparableExpression

      `asc, desc, gt, gt, gteq, gteq, lt, lt, lteq, lteq, max, min`

    - ### Methods inherited from interface javax.jdo.query.Expression

      `as, cast, count, countDistinct, eq, eq, instanceOf, ne, ne`

- - ### Method Detail

    - #### add

          StringExpression add(Expression expr)

      Method to return an expression for this expression added to the passed expression (String concatenation).
      Parameters:
        `expr` - The other expression
      Returns:
        The summation

    - #### add

          StringExpression add(String str)

      Method to return an expression for this expression added to the passed string (String concatenation).
      Parameters:
        `str` - The other string
      Returns:
        The summation

    - #### charAt

          CharacterExpression charAt(int pos)

      Method to return an expression for the character at a position of this string expression.
      Parameters:
        `pos` - The position
      Returns:
        Expression for the character

    - #### charAt

          CharacterExpression charAt(NumericExpression<Integer> pos)

      Method to return an expression for the character at a position of this string expression.
      Parameters:
        `pos` - The position
      Returns:
        Expression for the character

    - #### endsWith

          BooleanExpression endsWith(StringExpression expr)

      Method returning an expression for whether this string expression ends with the passed string expression.
      Parameters:
        `expr` - The expression that it ends with.
      Returns:
        Whether it ends with the other string

    - #### endsWith

          BooleanExpression endsWith(String str)

      Method returning an expression for whether this string expression ends with the passed string expression.
      Parameters:
        `str` - The string that it ends with.
      Returns:
        Whether it ends with the other string

    - #### equalsIgnoreCase

          BooleanExpression equalsIgnoreCase(StringExpression expr)

      Method returning an expression for whether this string expression is equal to (ignoring case) the passed string expression.
      Parameters:
        `expr` - The expression
      Returns:
        Whether they are equal

    - #### equalsIgnoreCase

          BooleanExpression equalsIgnoreCase(String str)

      Method returning an expression for whether this string expression is equal to (ignoring case) the passed string.
      Parameters:
        `str` - The string
      Returns:
        Whether they are equal

    - #### indexOf

          NumericExpression<Integer> indexOf(StringExpression expr)

      Method to return an expression for the position of the passed string in this string.
      Parameters:
        `expr` - The other string
      Returns:
        Expression for the position of the passed string

    - #### indexOf

          NumericExpression<Integer> indexOf(String str)

      Method to return an expression for the position of the passed string in this string.
      Parameters:
        `str` - The other string
      Returns:
        Expression for the position of the passed string

    - #### indexOf

          NumericExpression<Integer> indexOf(StringExpression expr,
                                             NumericExpression<Integer> pos)

      Method to return an expression for the position of the passed string in this string after a position.
      Parameters:
        `expr` - The other string
        `pos` - Start point of the search
      Returns:
        Expression for the position of the passed string

    - #### indexOf

          NumericExpression<Integer> indexOf(String str,
                                             NumericExpression<Integer> pos)

      Method to return an expression for the position of the passed string in this string after a position.
      Parameters:
        `str` - The other string
        `pos` - Start point of the search
      Returns:
        Expression for the position of the passed string

    - #### indexOf

          NumericExpression<Integer> indexOf(String str,
                                             int pos)

      Method to return an expression for the position of the passed string in this string after a position.
      Parameters:
        `str` - The other string
        `pos` - Start point of the search
      Returns:
        Expression for the position of the passed string

    - #### indexOf

          NumericExpression<Integer> indexOf(StringExpression expr,
                                             int pos)

      Method to return an expression for the position of the passed string in this string after a position.
      Parameters:
        `expr` - The other string
        `pos` - Start point of the search
      Returns:
        Expression for the position of the passed string

    - #### length

          NumericExpression<Integer> length()

      Method returning a expression for the length of this string.
      Returns:
        Expression for the length

    - #### matches

          BooleanExpression matches(StringExpression expr)

      Method to return an expression for whether this string expression matches the provided expression.
      Parameters:
        `expr` - The expression to match against
      Returns:
        Whether this expression matches the provided expression

    - #### matches

          BooleanExpression matches(String str)

      Method to return an expression for whether this string expression matches the provided string.
      Parameters:
        `str` - String literal to match against
      Returns:
        Whether this expression matches the provided string

    - #### startsWith

          BooleanExpression startsWith(StringExpression expr)

      Method returning an expression for whether this string expression starts with the passed string expression.
      Parameters:
        `expr` - The expression that it starts with.
      Returns:
        Whether it starts with the other string

    - #### startsWith

          BooleanExpression startsWith(String str)

      Method returning an expression for whether this string expression starts with the passed string.
      Parameters:
        `str` - The string that it starts with.
      Returns:
        Whether it starts with the other string

    - #### startsWith

          BooleanExpression startsWith(StringExpression expr,
                                       int index)

      Method returning an expression for whether the substring of this string beginning at the specified index starts with the passed string expression.
      Parameters:
        `expr` - The expression that it starts with.
        `index` - where to begin looking in this string
      Returns:
        Whether it starts with the other string

    - #### startsWith

          BooleanExpression startsWith(String str,
                                       int index)

      Method returning an expression for whether the substring of this string beginning at the specified index starts with the passed string.
      Parameters:
        `str` - The string that it starts with.
        `index` - where to begin looking in this string
      Returns:
        Whether it starts with the other string

    - #### substring

          StringExpression substring(NumericExpression<Integer> pos)

      Method to return an expression for the substring of this string expression.
      Parameters:
        `pos` - The position of the start point of the substring
      Returns:
        Expression for the substring

    - #### substring

          StringExpression substring(int pos)

      Method to return an expression for the substring of this string expression.
      Parameters:
        `pos` - The position of the start point of the substring
      Returns:
        Expression for the substring

    - #### substring

          StringExpression substring(NumericExpression<Integer> startPos,
                                     NumericExpression<Integer> endPos)

      Method to return an expression for the substring of this string expression.
      Parameters:
        `startPos` - The position of the start point of the substring (inclusive, origin 0)
        `endPos` - The position of the end point of the substring (exclusive, origin 0)
      Returns:
        Expression for the substring

    - #### substring

          StringExpression substring(int startPos,
                                     int endPos)

      Method to return an expression for the substring of this string expression.
      Parameters:
        `startPos` - The position of the start point of the substring (inclusive, origin 0)
        `endPos` - The position of the end point of the substring (exclusive, origin 0)
      Returns:
        Expression for the substring

    - #### toLowerCase

          StringExpression toLowerCase()

      Method to return a StringExpression representing this string expression in lower case.
      Returns:
        The lower case expression

    - #### toUpperCase

          StringExpression toUpperCase()

      Method to return a StringExpression representing this string expression in upper case.
      Returns:
        The upper case expression

    - #### trim

          StringExpression trim()

      Method returning a string expression with whitespace trimmed from start and end.
      Returns:
        String expression with whitespace trimmed

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