Class DelegatedExpression

java.lang.Object
org.datanucleus.store.rdbms.sql.expression.SQLExpression
org.datanucleus.store.rdbms.sql.expression.DelegatedExpression
Direct Known Subclasses:
EnumExpression, SingleCollectionExpression, StringNumericExpression, StringTemporalExpression, TypeConverterExpression, TypeConverterLiteral

public abstract class DelegatedExpression extends SQLExpression
Expression for a field/property that can delegate to an internal expression(s).
  • Field Details

    • delegate

      protected SQLExpression delegate
      The delegate expression that we use. MUST BE SET ON CONSTRUCTION.
  • Constructor Details

  • Method Details

    • eq

      public BooleanExpression eq(SQLExpression expr)
      Description copied from class: SQLExpression
      Equality operator (equals to)
      Overrides:
      eq in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      The type of an equality expression is a boolean
    • ne

      public BooleanExpression ne(SQLExpression expr)
      Description copied from class: SQLExpression
      Not equality operator (not equals to)
      Overrides:
      ne in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      The type of an equality expression is a boolean
    • add

      public SQLExpression add(SQLExpression expr)
      Description copied from class: SQLExpression
      Additive Operator. The binary + operator performs addition when applied to two operands of numeric type, producing the sum of the operands. If the type of either operand of a + operator is String, then the operation is string concatenation.
      Overrides:
      add in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      If one of the operands is String, the returned value is the string concatenation; The sum of two operands of numeric type. The left-hand operand is the minuend and the right-hand operand is the subtrahend;
    • div

      public SQLExpression div(SQLExpression expr)
      Description copied from class: SQLExpression
      Division Operator. The left-hand operand is the dividend and the right-hand operand is the divisor.
      Overrides:
      div in class SQLExpression
      Parameters:
      expr - the right-hand operator
      Returns:
      The binary / operator performs division, producing the quotient of its operands
    • ge

      public BooleanExpression ge(SQLExpression expr)
      Description copied from class: SQLExpression
      Relational operator (greater than or equals)
      Overrides:
      ge in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      true if the value of the left-hand operand is greater than or equal the value of the right-hand operand, and otherwise is false.
    • gt

      public BooleanExpression gt(SQLExpression expr)
      Description copied from class: SQLExpression
      Relational operator (greater than)
      Overrides:
      gt in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      true if the value of the left-hand operand is greater than the value of the right-hand operand, and otherwise is false.
    • le

      public BooleanExpression le(SQLExpression expr)
      Description copied from class: SQLExpression
      Relational operator (lower than or equals)
      Overrides:
      le in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      true if the value of the left-hand operand is less than or equal to the value of the right-hand operand, and otherwise is false.
    • lt

      public BooleanExpression lt(SQLExpression expr)
      Description copied from class: SQLExpression
      Relational operator (lower than)
      Overrides:
      lt in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      true if the value of the left-hand operand is less than the value of the right-hand operand, and otherwise is false.
    • mod

      public SQLExpression mod(SQLExpression expr)
      Description copied from class: SQLExpression
      Remainder Operator. The left-hand operand is the dividend and the right-hand operand is the divisor.
      Overrides:
      mod in class SQLExpression
      Parameters:
      expr - the right-hand operator
      Returns:
      The binary % operator is said to yield the remainder of its operands from an implied division
    • mul

      public SQLExpression mul(SQLExpression expr)
      Description copied from class: SQLExpression
      Multiplication Operator
      Overrides:
      mul in class SQLExpression
      Parameters:
      expr - the right-hand operator
      Returns:
      The binary * operator performs multiplication, producing the product of its operands.
    • sub

      public SQLExpression sub(SQLExpression expr)
      Description copied from class: SQLExpression
      Additive Operator. The binary - operator subtracts right-hand operand from left-hand operand.
      Overrides:
      sub in class SQLExpression
      Parameters:
      expr - the right-hand operand
      Returns:
      The binary - operator performs subtraction when applied to two operands of numeric type producing the difference of its operands; the left-hand operand is the minuend and the right-hand operand is the subtrahend.
    • invoke

      public SQLExpression invoke(String methodName, List<SQLExpression> args)
      Description copied from class: SQLExpression
      Invocation of a method on this expression.
      Overrides:
      invoke in class SQLExpression
      Parameters:
      methodName - name of the method to invoke
      args - Args to this method (if any)
      Returns:
      the converted value
    • toSQLText

      public SQLText toSQLText()
      Description copied from class: SQLExpression
      Method to return the SQL form of this expression.
      Overrides:
      toSQLText in class SQLExpression
      Returns:
      The SQL
    • getDelegate

      public SQLExpression getDelegate()
      Accessor for the delegate that represents this enum. Will be either a StringExpression or a NumericExpression depending whether the enum is stored as a string or as a numeric.
      Returns:
      The delegate
    • isParameter

      public boolean isParameter()
      Overrides:
      isParameter in class SQLExpression