Package org.apache.groovy.ast.tools

Class ExpressionUtils

  • public class ExpressionUtils
extends Object

    • Method Detail

      • transformBinaryConstantExpression

        public static ConstantExpression transformBinaryConstantExpression​(BinaryExpression be,
                                                                   ClassNode targetType)
        Turns expressions of the form ConstantExpression(40) + ConstantExpression(2) into the simplified ConstantExpression(42) at compile time.
        Parameters:
        be - the binary expression
        targetType - the type of the result
        Returns:
        the transformed expression or the original if no transformation was performed

      • isTypeOrArrayOfType

        public static boolean isTypeOrArrayOfType​(ClassNode targetType,
                                          ClassNode type,
                                          boolean recurse)
        Determine if a type matches another type (or array thereof).
        Parameters:
        targetType - the candidate type
        type - the type we are checking against
        recurse - true if we can have multi-dimension arrays; should be false for annotation member types
        Returns:
        true if the type equals the targetType or array thereof

      • isNumberOrArrayOfNumber

        public static boolean isNumberOrArrayOfNumber​(ClassNode targetType,
                                              boolean recurse)
        Determine if a type is derived from Number (or array thereof).
        Parameters:
        targetType - the candidate type
        recurse - true if we can have multi-dimension arrays; should be false for annotation member types
        Returns:
        true if the type equals the targetType or array thereof

      • transformInlineConstants

        public static Expression transformInlineConstants​(Expression exp,
                                                  ClassNode attrType)
        Converts simple expressions of constants into pre-evaluated simple constants. Handles:
        • Property expressions - referencing constants
        • Simple binary expressions - String concatenation and numeric +, -, /, *
        • List expressions - list of constants
        • Variable expressions - referencing constants
        Parameters:
        exp - the original expression
        attrType - the type that the final constant should be
        Returns:
        the transformed type or the original if no transformation was possible

      • transformListOfConstants

        public static Expression transformListOfConstants​(ListExpression origList,
                                                  ClassNode attrType)
        Given a list of constants, transform each item in the list.
        Parameters:
        origList - the list to transform
        attrType - the target type
        Returns:
        the transformed list or the original if nothing was changed

      • transformInlineConstants

        public static Expression transformInlineConstants​(Expression exp)
        The attribute values of annotations must be primitive, String or Enum constants. In various places, such constants can be seen during type resolution but won't be readily accessible in later phases, e.g. they might be embedded into constructor code. This method transforms constants that would appear in annotations early so they aren't lost. Subsequent processing determines whether they are valid, this method simply retains the constant value as a constant expression.
        Parameters:
        exp - the original expression
        Returns:
        the converted expression