Examples of java.lang.reflect.Method

java.lang.reflect.Method
A Method provides information about, and access to, a single method on a class or interface. The reflected method may be a class method or an instance method (including an abstract method).
A Method permits widening conversions to occur when matching the actual parameters to invoke with the underlying method's formal parameters, but it throws an IllegalArgumentException if a narrowing conversion would occur. @see Member @see java.lang.Class @see java.lang.Class#getMethods() @see java.lang.Class#getMethod(String,Class[]) @see java.lang.Class#getDeclaredMethods() @see java.lang.Class#getDeclaredMethod(String,Class[]) @author Kenneth Russell @author Nakul Saraiya


    // do mapping
    UserGroupPrime userGroupPrime = mapper.map(userGroup, UserGroupPrime.class);


    // prove access to generic type information
    Method setter = UserGroupPrime.class.getMethod("setUsers", List.class);
    Type[] parameterTypes = setter.getGenericParameterTypes();
    assertEquals(1, parameterTypes.length);
    ParameterizedType parameterType = (ParameterizedType) parameterTypes[0];
    assertEquals(List.class, parameterType.getRawType());
    assertEquals(UserPrime.class, parameterType.getActualTypeArguments()[0]);

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      for (ValidatorWrapper wrapper : list)
      {
        if (!gotRawValue)
        {
          Method getter = wrapper.getGetterMethod();
          rawValue = ReflectHelper.invokeMethod(form, getter);
          gotRawValue = true;
        }


        boolean validate = true;

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        Class validatorFactoryClass = factory.value();


        ValidatorFactory v = ReflectHelper.createInstance(validatorFactoryClass, ValidatorFactory.class);


        Method getter = getGetter(method);
        ValidatorWrapper wrapper = v.create(annotation, getter);
        Validator validator = wrapper.getValidator();


        // if we using the raw type, we can check that the generic type matches the
        if (!wrapper.getUsesConvertedValue())

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    return converter;
  }


  Method getGetter(Method method)
  {
    Method getter = ReflectHelper.getGetter(method);


    if (getter == null)
    {
      throw new ApplicationConfigurationException("Setter method " + method
          + " has no corresponding getter method");

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    //   Test overloaded methods
    //  ===============================================================================================
    @Test public void testFindBestMethodWithSignature_String() throws Exception {
        ReflectionHelper helper = new ReflectionHelper(FakeInterface.class);
        Class[] signatureSought = new Class[] {String.class};
        Method theMethod = helper.findBestMethodWithSignature("method", signatureSought ); //$NON-NLS-1$
        assertNotNull("Failed to find method for args: " + signatureSought, theMethod); //$NON-NLS-1$


        // make sure we got the method we expected
        Class[] signatureFound = theMethod.getParameterTypes();
        Class[] signatureExpected = signatureSought;
        assertEquals("Wrong class", theMethod.getDeclaringClass().getName(), FakeInterface.class.getName()); //$NON-NLS-1$
        helpAssertSameMethodSignature("Found wrong method signature", signatureExpected, signatureFound); //$NON-NLS-1$
    }

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    }


    @Test public void testFindBestMethodWithSignature_Serializable() throws Exception {
        ReflectionHelper helper = new ReflectionHelper(FakeInterface.class);
        Class[] signatureSought = new Class[] {Serializable.class};
        Method theMethod = helper.findBestMethodWithSignature("method", signatureSought ); //$NON-NLS-1$
        assertNotNull("Failed to find method for args: " + signatureSought, theMethod); //$NON-NLS-1$


        // make sure we got the method we expected
        Class[] signatureFound = theMethod.getParameterTypes();
        Class[] signatureExpected = new Class[] {Serializable.class};
        assertEquals("Wrong class", theMethod.getDeclaringClass().getName(), FakeInterface.class.getName()); //$NON-NLS-1$
        helpAssertSameMethodSignature("Found wrong method signature", signatureExpected, signatureFound); //$NON-NLS-1$
    }

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    }


    @Test public void testFindBestMethodWithSignature_StringArray() throws Exception {
        ReflectionHelper helper = new ReflectionHelper(FakeInterface.class);
        Class[] signatureSought = new Class[] {String[].class};
        Method theMethod = helper.findBestMethodWithSignature("method", signatureSought ); //$NON-NLS-1$
        assertNotNull("Failed to find method for args: " + signatureSought, theMethod); //$NON-NLS-1$


        // make sure we got the method we expected
        Class[] signatureFound = theMethod.getParameterTypes();
        Class[] signatureExpected = signatureSought;
        assertEquals("Wrong class", theMethod.getDeclaringClass().getName(), FakeInterface.class.getName()); //$NON-NLS-1$
        helpAssertSameMethodSignature("Found wrong method signature", signatureExpected, signatureFound); //$NON-NLS-1$
    }

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    }


    @Test public void testFindBestMethodWithSignature_Integer() throws Exception {
        ReflectionHelper helper = new ReflectionHelper(FakeInterface.class);
        Class[] signatureSought = new Class[] {Integer.class};
        Method theMethod = helper.findBestMethodWithSignature("method", signatureSought ); //$NON-NLS-1$
        assertNotNull("Failed to find method for args: " + signatureSought, theMethod); //$NON-NLS-1$


        // make sure we got the method we expected
        Class[] signatureFound = theMethod.getParameterTypes();
        Class[] signatureExpected = signatureSought;
        assertEquals("Wrong class", theMethod.getDeclaringClass().getName(), FakeInterface.class.getName()); //$NON-NLS-1$
        helpAssertSameMethodSignature("Found wrong method signature", signatureExpected, signatureFound); //$NON-NLS-1$
    }

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    }


    @Test public void testFindBestMethodWithSignature_long() throws Exception {
        ReflectionHelper helper = new ReflectionHelper(FakeInterface.class);
        Class[] signatureSought = new Class[] {Long.TYPE};
        Method theMethod = helper.findBestMethodWithSignature("method", signatureSought ); //$NON-NLS-1$
        assertNotNull("Failed to find method for args: " + signatureSought, theMethod); //$NON-NLS-1$


        // make sure we got the method we expected
        Class[] signatureFound = theMethod.getParameterTypes();
        Class[] signatureExpected = signatureSought;
        assertEquals("Wrong class", theMethod.getDeclaringClass().getName(), FakeInterface.class.getName()); //$NON-NLS-1$
        helpAssertSameMethodSignature("Found wrong method signature", signatureExpected, signatureFound); //$NON-NLS-1$
    }

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    }


    @Test public void testFindBestMethodWithSignature_2ArgSerializableAndNumber() throws Exception {
        ReflectionHelper helper = new ReflectionHelper(FakeInterface.class);
        Class[] signatureSought = new Class[] {Integer.class, Integer.class};
        Method theMethod = helper.findBestMethodWithSignature("method", signatureSought ); //$NON-NLS-1$
        assertNotNull("Failed to find method for args: " + signatureSought, theMethod); //$NON-NLS-1$


        // make sure we got the method we expected
        Class[] signatureFound = theMethod.getParameterTypes();
        Class[] signatureExpected = new Class[] {Serializable.class, Number.class};
        assertEquals("Wrong class", theMethod.getDeclaringClass().getName(), FakeInterface.class.getName()); //$NON-NLS-1$
        helpAssertSameMethodSignature("Found wrong method signature", signatureExpected, signatureFound); //$NON-NLS-1$
    }

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