org.springframework.expression.spel.ast

Class OperatorInstanceof

  • All Implemented Interfaces:
    Opcodes, SpelNode


    public class OperatorInstanceof
    extends Operator
    The operator 'instanceof' checks if an object is of the class specified in the right hand operand, in the same way that instanceof does in Java.
    Since:
    3.0
    Author:
    Andy Clement
    • Constructor Detail

      • OperatorInstanceof

        public OperatorInstanceof(int pos,
                                  SpelNodeImpl... operands)
    • Method Detail

      • getValueInternal

        public BooleanTypedValue getValueInternal(ExpressionState state)
                                           throws EvaluationException
        Compare the left operand to see it is an instance of the type specified as the right operand. The right operand must be a class.
        Specified by:
        getValueInternal in class SpelNodeImpl
        Parameters:
        state - the expression state
        Returns:
        true if the left operand is an instanceof of the right operand, otherwise false
        Throws:
        EvaluationException - if there is a problem evaluating the expression
      • isCompilable

        public boolean isCompilable()
        Description copied from class: 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.
        Overrides:
        isCompilable in class SpelNodeImpl
        Returns:
        true if this node can be compiled to bytecode
      • generateCode

        public void generateCode(MethodVisitor mv,
                                 CodeFlow cf)
        Description copied from class: 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. For example it will include information about the type of the object currently on the stack.
        Overrides:
        generateCode in class SpelNodeImpl
        Parameters:
        mv - the ASM MethodVisitor into which code should be generated
        cf - a context object with info about what is on the stack