程序包 cn.taketoday.expression.spel.ast

类 PropertyOrFieldReference

java.lang.Object
cn.taketoday.expression.spel.ast.SpelNodeImpl
cn.taketoday.expression.spel.ast.PropertyOrFieldReference
所有已实现的接口:
Opcodes, SpelNode
public class PropertyOrFieldReference extends SpelNodeImpl
Represents a simple property or field reference.
从以下版本开始:
4.0
作者:
Andy Clement, Juergen Hoeller, Clark Duplichien, Sam Brannen, Harry Yang

  • 字段详细资料

  • 构造器详细资料

    • PropertyOrFieldReference

      public PropertyOrFieldReference(boolean nullSafe, String propertyOrFieldName, int startPos, int endPos)

  • 方法详细资料

    • isNullSafe

      public boolean isNullSafe()

    • getName

      public String getName()

    • getValueRef

      public ValueRef getValueRef(ExpressionState state) throws EvaluationException
      覆盖:
      getValueRef 在类中 SpelNodeImpl
      抛出:
      EvaluationException

    • getValueInternal

      public TypedValue getValueInternal(ExpressionState state) throws EvaluationException
      指定者:
      getValueInternal 在类中 SpelNodeImpl
      抛出:
      EvaluationException

    • getValueInternal

      private TypedValue getValueInternal(TypedValue contextObject, EvaluationContext evalContext, boolean isAutoGrowNullReferences) throws EvaluationException
      抛出:
      EvaluationException

    • setValueInternal

      public TypedValue setValueInternal(ExpressionState state, Supplier<TypedValue> valueSupplier) throws EvaluationException
      从类复制的说明: SpelNodeImpl
      Evaluate the expression to a node and then set the new value created by the specified Supplier on that node.

      For example, if the expression evaluates to a property reference, then the property will be set to the new value.

      Favor this method over SpelNodeImpl.setValue(ExpressionState, Object) when the value should be lazily computed.

      By default, this method throws a SpelEvaluationException, effectively disabling this feature. Subclasses may override this method to provide an actual implementation.

      覆盖:
      setValueInternal 在类中 SpelNodeImpl
      参数:
      state - the current expression state (includes the context)
      valueSupplier - a supplier of the new value
      抛出:
      EvaluationException - if any problem occurs evaluating the expression or setting the new value

    • isWritable

      public boolean isWritable(ExpressionState state) throws EvaluationException
      从接口复制的说明: SpelNode
      Determine if this expression node will support a setValue() call.
      指定者:
      isWritable 在接口中 SpelNode
      覆盖:
      isWritable 在类中 SpelNodeImpl
      参数:
      state - the current expression state (includes the context)
      返回:
      true if the expression node will allow setValue()
      抛出:
      EvaluationException - if something went wrong trying to determine if the node supports writing

    • toStringAST

      public String toStringAST()
      从接口复制的说明: SpelNode
      Return the string form the this AST node.
      返回:
      the string form

    • readProperty

      private TypedValue readProperty(TypedValue contextObject, EvaluationContext evalContext, String name) throws EvaluationException
      Attempt to read the named property from the current context object.
      返回:
      the value of the property
      抛出:
      EvaluationException - if any problem accessing the property or it cannot be found

    • writeProperty

      private void writeProperty(TypedValue contextObject, EvaluationContext evalContext, String name, @Nullable Object newValue) throws EvaluationException
      抛出:
      EvaluationException

    • isWritableProperty

      public boolean isWritableProperty(String name, TypedValue contextObject, EvaluationContext evalContext) throws EvaluationException
      抛出:
      EvaluationException

    • getPropertyAccessorsToTry

      private List<PropertyAccessor> getPropertyAccessorsToTry(@Nullable Object contextObject, List<PropertyAccessor> propertyAccessors)
      Determines the set of property resolvers that should be used to try and access a property on the specified target type. The resolvers are considered to be in an ordered list, however in the returned list any that are exact matches for the input target type (as opposed to 'general' resolvers that could work for any type) are placed at the start of the list. In addition, there are specific resolvers that exactly name the class in question and resolvers that name a specific class but it is a supertype of the class we have. These are put at the end of the specific resolvers set and will be tried after exactly matching accessors but before generic accessors.
      参数:
      contextObject - the object upon which property access is being attempted
      返回:
      a list of resolvers that should be tried in order to access the property

    • isCompilable

      public boolean isCompilable()
      从类复制的说明: SpelNodeImpl
      Check whether a node can be compiled to bytecode. The reasoning in each node may be different but will typically involve checking whether the exit type descriptor of the node is known and any relevant child nodes are compilable.
      覆盖:
      isCompilable 在类中 SpelNodeImpl
      返回:
      true if this node can be compiled to bytecode

    • generateCode

      public void generateCode(MethodVisitor mv, CodeFlow cf)
      从类复制的说明: SpelNodeImpl
      Generate the bytecode for this node into the supplied visitor. Context info about the current expression being compiled is available in the codeflow object, e.g. including information about the type of the object currently on the stack.
      覆盖:
      generateCode 在类中 SpelNodeImpl
      参数:
      mv - the ASM MethodVisitor into which code should be generated
      cf - a context object with info about what is on the stack

    • setExitTypeDescriptor

      void setExitTypeDescriptor(String descriptor)