Constructor

Constructor Manipulation using Mirror.

Reflecting

Reflecting a constructor by arguments (will return null if not found):


Class<T> clazz;

Constructor<T> c = new Mirror().on(clazz).reflect().constructor()

                        .withArgs(String.class, Object.class);

Reflecting the only constructor of a class (will throw MirrorException if more than one is found):


Class<T> clazz;

Constructor<T> m = new Mirror().on(clazz).reflect().constructor().withAnyArgs();

Reflecting all constructors of a class (will return an empty list if none found):


Class<T> clazz;

List<Constructor<T>> l = new Mirror().on(clazz).reflectAll().constructors();

Reflecting all constructors of a class that matches a Matcher<Constructor> (will return an empty list if none found):


Class<T> clazz;

List<Constructor<T>> l = new Mirror().on(clazz).reflectAll()

                                  .constructors().matching(new YourCustomMatcher());

You can also map your constructors to other types:


Class clazz;

List<String> l = new Mirror().on(clazz).reflectAll()

                      .constructors().mappingTo(new YourConstructorToStringMapper());

Invoking Constructors

Invoking a constructor:


Class<T> clazz;

T t = new Mirror().on(clazz).invoke().constructor().withoutArgs();

You can also pass a java.lang.reflect.Constructor:


Constructor<T> aConstructor;

Class<T> clazz;

T t = new Mirror().on(clazz).invoke().constructor(aConstructor).withArgs(value1, value2);

Bypassing Constructors

With Mirror, you can completely bypass constructors to create instances.


Class<T> clazz;

T t = new Mirror().on(clazz).invoke().constructor().bypasser();

Please note that this is only supported on Objenesis supported VMs. Take a look at http://code.google.com/p/objenesis/wiki/ListOfCurrentlySupportedVMs .