程序包 cn.taketoday.expression

接口 EvaluationContext

所有已知实现类:
SimpleEvaluationContext, StandardEvaluationContext
public interface EvaluationContext
Expressions are executed in an evaluation context. It is in this context that references are resolved when encountered during expression evaluation.

There is a default implementation of this EvaluationContext interface: StandardEvaluationContext which can be extended, rather than having to implement everything manually.

从以下版本开始:
4.0
作者:
Andy Clement, Juergen Hoeller

  • 方法详细资料

    • getRootObject

      TypedValue getRootObject()
      Return the default root context object against which unqualified properties/methods/etc should be resolved. This can be overridden when evaluating an expression.

    • getPropertyAccessors

      List<PropertyAccessor> getPropertyAccessors()
      Return a list of accessors that will be asked in turn to read/write a property.

    • getConstructorResolvers

      List<ConstructorResolver> getConstructorResolvers()
      Return a list of resolvers that will be asked in turn to locate a constructor.

    • getMethodResolvers

      List<MethodResolver> getMethodResolvers()
      Return a list of resolvers that will be asked in turn to locate a method.

    • getBeanResolver

      @Nullable BeanResolver getBeanResolver()
      Return a bean resolver that can look up beans by name.

    • getTypeLocator

      TypeLocator getTypeLocator()
      Return a type locator that can be used to find types, either by short or fully qualified name.

    • getTypeConverter

      TypeConverter getTypeConverter()
      Return a type converter that can convert (or coerce) a value from one type to another.

    • getTypeComparator

      TypeComparator getTypeComparator()
      Return a type comparator for comparing pairs of objects for equality.

    • getOperatorOverloader

      OperatorOverloader getOperatorOverloader()
      Return an operator overloader that may support mathematical operations between more than the standard set of types.

    • setVariable

      void setVariable(String name, @Nullable Object value)
      Set a named variable within this evaluation context to a specified value.
      参数:
      name - the name of the variable to set
      value - the value to be placed in the variable

    • lookupVariable

      @Nullable Object lookupVariable(String name)
      Look up a named variable within this evaluation context.
      参数:
      name - variable to lookup
      返回:
      the value of the variable, or null if not found