Method visit

java/org/apache/el/lang/ExpressionBuilder.java:181–221

(Node node)

    }

    @Override
    public void visit(Node node) throws ELException {
        if (node instanceof AstFunction funcNode) {

            Method m = null;

            if (this.fnMapper != null) {
                m = fnMapper.resolveFunction(funcNode.getPrefix(), funcNode.getLocalName());
            }

            // References to variables that refer to lambda expressions will be
            // parsed as functions. This is handled at runtime but at this point
            // need to treat it as a variable rather than a function.
            if (m == null && this.varMapper != null && funcNode.getPrefix().isEmpty()) {
                this.varMapper.resolveVariable(funcNode.getLocalName());
                return;
            }

            if (this.fnMapper == null) {
                throw new ELException(MessageFactory.get("error.fnMapper.null"));
            }

            if (m == null) {
                throw new ELException(MessageFactory.get("error.fnMapper.method", funcNode.getOutputName()));
            }

            int methodParameterCount = m.getParameterTypes().length;
            // AstFunction->MethodParameters->Parameters()
            int inputParameterCount = node.jjtGetChild(0).jjtGetNumChildren();
            if (m.isVarArgs() && inputParameterCount < methodParameterCount - 1 ||
                    !m.isVarArgs() && inputParameterCount != methodParameterCount) {
                throw new ELException(MessageFactory.get("error.fnMapper.paramcount", funcNode.getOutputName(),
                        "" + methodParameterCount, "" + node.jjtGetChild(0).jjtGetNumChildren()));
            }
        } else if (node instanceof AstIdentifier && this.varMapper != null) {
            String variable = node.getImage();

            // simply capture it
            this.varMapper.resolveVariable(variable);
        }
    }

    /**
     * Creates a ValueExpression from the parsed expression.