Class ExpressionAbstract

Object
ExpressionAbstract
All Implemented Interfaces:
Expression
Direct Known Subclasses:
DefaultExpression, FunctionImpl

public abstract class ExpressionAbstract extends Object implements Expression
Abstract superclass of these Expression implementations.
Author:
Jody Garnett
  • Constructor Details

    • ExpressionAbstract

      public ExpressionAbstract()
  • Method Details

    • evaluate

      public Object evaluate(Object object)
      Subclass should override, default implementation returns null.
      Specified by:
      evaluate in interface Expression
      Returns:
      default implementation returns null
    • evaluate

      public <T> T evaluate(Object object, Class<T> context)
      Default implementation delegates handling of context conversion to Converters utility class.

      Subclasses are expected to make use of the Converters utility class (as the easiest way to provide value morphing in conformance with the Filter specification).

      Specified by:
      evaluate in interface Expression
      Type Parameters:
      T - The type of the returned object.
      Parameters:
      object - The object to evaluate the expression against.
      context - The type of the resulting value of the expression.
      Returns:
      Evaluates the given expression based on the content of the given object an an instance of context.