FunctionMethodResolver<T extends Object> class final

A MethodResolver for objects of type T, built from one function per method name.

Use it to let expressions call a few methods of a class that is not @Introspected. Each function gets the target and the list of evaluated arguments, whatever their number, and checks them itself; arguments are not converted.

// greet('Bob') can be called on a User.
final context = StandardEvaluationContext(user)
  ..addMethodResolver(FunctionMethodResolver<User>({
    'greet': (u, args) => 'Hi ${args.first}, I am ${u.name}',
  }));
SpelExpressionParser()
    .parseExpression("greet('Bob')")
    .getValue(context); // 'Hi Bob, I am Ada'

Spring (Java):

// Spring finds greet(String) by reflection (ReflectiveMethodResolver):
parser.parseExpression("greet('Bob')").getValue(context);

Implemented types

• MethodResolver

Constructors

FunctionMethodResolver(Map<String, Object? Function(T target, List<Object?> args)> methods)

Exposes methods of T, keyed by method name; each function gets the target and the argument list (any arity).

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

resolve(EvaluationContext context, Object target, String name, List<Object?> arguments) → MethodExecutor?

An executor that runs method name on target with arguments (already evaluated), or null to let the next resolver try.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited