org.springframework.expression.spel.ast

Class FunctionReference

  • All Implemented Interfaces:
    Opcodes, SpelNode


    public class FunctionReference
    extends SpelNodeImpl
    A function reference is of the form "#someFunction(a,b,c)". Functions may be defined in the context prior to the expression being evaluated. Functions may also be static Java methods, registered in the context prior to invocation of the expression.

    Functions are very simplistic. The arguments are not part of the definition (right now), so the names must be unique.

    Since:
    3.0
    Author:
    Andy Clement, Juergen Hoeller
    • Constructor Detail

      • FunctionReference

        public FunctionReference(java.lang.String functionName,
                                 int pos,
                                 SpelNodeImpl... arguments)
    • Method Detail

      • toStringAST

        public java.lang.String toStringAST()
        Description copied from interface: SpelNode
        Return the string form the this AST node.
        Returns:
        the string form
      • 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