Class FunctionCallExpr

  • All Implemented Interfaces:
    Serializable, GrelExpr
    Direct Known Subclasses:

    public class FunctionCallExpr
    extends Object
    implements GrelExpr
    An abstract syntax tree node encapsulating a function call. The function's arguments are all evaluated down to values before the function is applied. If any argument is an error, the function is not applied, and the error is the result of the expression.
    See Also:
    Serialized Form
    • Field Detail

      • _function

        protected final Function _function
      • _args

        protected final GrelExpr[] _args
      • _sourceName

        protected final String _sourceName
    • Method Detail

      • evaluate

        public Object evaluate​(Properties bindings)
        Description copied from interface: GrelExpr
        Returns the value of the expression in a given context.
        Specified by:
        evaluate in interface GrelExpr
        bindings - the evaluation context, mapping variable names to their values
        the result of the evaluation of the expression
      • toString

        public String toString()
        Description copied from interface: GrelExpr
        For GREL expressions, toString should return the source code of the expression, or a source code for an equivalent expression. (without the "grel:" prefix).
        Specified by:
        toString in interface GrelExpr
        toString in class Object
      • getColumnDependencies

        public final Set<String> getColumnDependencies​(String baseColumn)
        Description copied from interface: GrelExpr
        Returns the names of the columns this expression depends on.
        Specified by:
        getColumnDependencies in interface GrelExpr
        baseColumn - the name of the column this expression is based on (null if none)
        null if the columns could not be isolated: in this case, the expression might depend on all columns in the project.
      • renameColumnDependencies

        public FunctionCallExpr renameColumnDependencies​(Map<String,​String> substitutions)
        Description copied from interface: GrelExpr
        Translates this expression by simultaneously substituting column names as the supplied map specifies.

        This is only possible if the extraction of column dependencies with GrelExpr.getColumnDependencies(String) succeeds (return a non-null value).

        Specified by:
        renameColumnDependencies in interface GrelExpr
        substitutions - a map specifying new names for some columns. If a column name is not present in the map, it is assumed that the column is not renamed.
        a new expression with updated column names.
      • isLocal

        public boolean isLocal()
        Specified by:
        isLocal in interface GrelExpr
        true when the expression can be evaluated purely based on the local context (see Evaluable).