Package 

Class Reflect

  • All Implemented Interfaces:

    
    public class Reflect
    
                        

    A wrapper for an Object or Class upon which reflective calls can be made.

    An example of using Reflect is

    // Static import all reflection methods to decrease verbosity
    import static org.joor.Reflect.*;
    
    // Wrap an Object / Class / class name with the on() method:
    on("java.lang.String")
    // Invoke constructors using the create() method:
    .create("Hello World")
    // Invoke methods using the call() method:
    .call("toString")
    // Retrieve the wrapped object
    • Constructor Detail

    • Method Detail

      • on

         static Reflect on(String name)

        Wrap a class name.

        This is the same as calling on(Class.forName(name))

        Parameters:
        name - A fully qualified class name
      • on

         static Reflect on(String name, ClassLoader classLoader)

        Wrap a class name, loading it via a given class loader.

        This is the same as calling on(Class.forName(name, classLoader))

        Parameters:
        name - A fully qualified class name.
        classLoader - The class loader in whose context the class should be loaded.
      • on

         static Reflect on(Class<out Object> clazz)

        Wrap a class.

        Use this when you want to access static fields and methods on a Class object, or as a basis for constructing objects of that class using create

        Parameters:
        clazz - The class to be wrapped
      • on

         static Reflect on(Object object)

        Wrap an object.

        Use this when you want to access instance fields and methods on any Object

        Parameters:
        object - The object to be wrapped
      • get

         <T> T get()

        Get the wrapped object

      • get

         <T> T get(String name)

        Get a field value.

        This is roughly equivalent to get. If the wrapped object is a Class, then this will get a value from a static member field. If the wrapped object is any other Object, then this will get a value from an instance member field.

        If you want to "navigate" to a wrapped version of the field, use field instead.

        Parameters:
        name - The field name
      • field

         Reflect field(String name)

        Get a wrapped field.

        This is roughly equivalent to get. If the wrapped object is a Class, then this will wrap a static member field. If the wrapped object is any other Object, then this wrap an instance member field.

        Parameters:
        name - The field name
      • fields

         Map<String, Reflect> fields()

        Get a Map containing field names and wrapped values for the fields' values.

        If the wrapped object is a Class, then this will return static fields. If the wrapped object is any other Object, then this will return instance fields.

        These two calls are equivalent

        on(object).field("myField");
        on(object).fields().get("myField");
        
      • call

         Reflect call(String name)

        Call a method by its name.

        This is a convenience method for calling call(name, new Object[0])

        Parameters:
        name - The method name
      • call

         Reflect call(String name, Array<Object> args)

        Call a method by its name.

        This is roughly equivalent to invoke. If the wrapped object is a Class, then this will invoke a static method. If the wrapped object is any other Object, then this will invoke an instance method.

        Just like invoke, this will try to wrap primitive types or unwrap primitive type wrappers if applicable. If several methods are applicable, by that rule, the first one encountered is called. i.e. when calling

        on(...).call("method", 1, 1);
        
        The first of the following methods will be called:
        public void method(int param1, Integer param2);
        public void method(Integer param1, int param2);
        public void method(Number param1, Number param2);
        public void method(Number param1, Object param2);
        public void method(int param1, Object param2);
        

        The best matching method is searched for with the following strategy:

        • public method with exact signature match in class hierarchy
        • non-public method with exact signature match on declaring class
        • public method with similar signature in class hierarchy
        • non-public method with similar signature on declaring class
        Parameters:
        name - The method name
        args - The method arguments
      • create

         Reflect create()

        Call a constructor.

        This is a convenience method for calling create(new Object[0])

      • create

         Reflect create(Array<Object> args)

        Call a constructor.

        This is roughly equivalent to newInstance. If the wrapped object is a Class, then this will create a new object of that class. If the wrapped object is any other Object, then this will create a new object of the same type.

        Just like newInstance, this will try to wrap primitive types or unwrap primitive type wrappers if applicable. If several constructors are applicable, by that rule, the first one encountered is called. i.e. when calling

        on(C.class).create(1, 1);
        
        The first of the following constructors will be applied:
        public C(int param1, Integer param2);
        public C(Integer param1, int param2);
        public C(Number param1, Number param2);
        public C(Number param1, Object param2);
        public C(int param1, Object param2);
        
        Parameters:
        args - The constructor arguments
      • as

         <P> P as(Class<P> proxyType)

        Create a proxy for the wrapped object allowing to typesafely invoke methods on it using a custom interface

        Parameters:
        proxyType - The interface type that is implemented by the proxy
      • wrapper

         static Class<out Object> wrapper(Class<out Object> type)

        Get a wrapper type for a primitive type, or the argument type itself, if it is not a primitive type.