程序包 cn.taketoday.expression.spel.ast

类 CompoundExpression

java.lang.Object
cn.taketoday.expression.spel.ast.SpelNodeImpl
cn.taketoday.expression.spel.ast.CompoundExpression
所有已实现的接口:
Opcodes, SpelNode
public class CompoundExpression extends SpelNodeImpl
Represents a DOT separated expression sequence, such as property1.property2.methodOne() or property1?.property2?.methodOne() when the null-safe navigation operator is used.

May also contain array/collection/map indexers, such as property1[0].property2['key'].

从以下版本开始:
4.0
作者:
Andy Clement, Harry Yang

  • 构造器详细资料

    • CompoundExpression

      public CompoundExpression(int startPos, int endPos, SpelNodeImpl... expressionComponents)

  • 方法详细资料

    • getValueRef

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

    • getValueInternal

      public TypedValue getValueInternal(ExpressionState state) throws EvaluationException
      Evaluates a compound expression. This involves evaluating each piece in turn and the return value from each piece is the active context object for the subsequent piece.
      指定者:
      getValueInternal 在类中 SpelNodeImpl
      参数:
      state - the state in which the expression is being evaluated
      返回:
      the final value from the last piece of the compound expression
      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

    • 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