Package org.apache.groovy.ast.tools

Class ExpressionUtils

java.lang.Object
org.apache.groovy.ast.tools.ExpressionUtils
public final class ExpressionUtils extends Object

  • Method Details

    • isNullConstant

      public static boolean isNullConstant(Expression expression)

    • isThisExpression

      public static boolean isThisExpression(Expression expression)

    • isSuperExpression

      public static boolean isSuperExpression(Expression expression)

    • isThisOrSuper

      public static boolean isThisOrSuper(Expression expression)

    • isTypeOrArrayOfType

      public static boolean isTypeOrArrayOfType(ClassNode targetType, ClassNode type, boolean recurse)
      Determines 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)
      Determines 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

    • transformBinaryConstantExpression

      public static ConstantExpression transformBinaryConstantExpression(BinaryExpression be, ClassNode targetType)
      Converts expressions like 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

    • transformInlineConstants

      public static Expression transformInlineConstants(Expression exp)
      Transforms constants that would appear in annotations so they aren't lost. Subsequent processing determines whether they are valid, this retains the constant value as a constant expression.

      The attribute values of annotations must be primitive, string, annotation or enumeration 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.

      Parameters:
      exp - the original expression
      Returns:
      original or transformed expression

    • transformInlineConstants

      public static Expression transformInlineConstants(Expression exp, ClassNode attrType)
      Converts simple expressions of constants into pre-evaluated simple constants. Handles:
      • Property expressions - referencing constants
      • Variable expressions - referencing constants
      • Typecast expressions - referencing constants
      • Binary expressions - string concatenation and numeric +, -, /, *
      • List expressions - list of 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