Package org.basex.util

Class Reflect

java.lang.Object

org.basex.util.Reflect

public final class Reflect
extends Object

This class assembles some reflection methods. Most exceptions are caught and replaced by a null value.

Author:

BaseX Team 2005-23, BSD License, Christian Gruen

Method Summary

Modifier and Type	Method	Description
static boolean	available(String pattern, Object... ext)	Checks if the class specified by the pattern is available.
static Field	field(Class<?> clazz, String name)	Caches and returns a reference to the specified field or null.
static <O> Constructor<O>	find(Class<O> clazz, Class<?>... types)	Caches and returns a constructor by parameter types.
static Class<?>	find(String name)	Caches and returns a reference to the specified class.
static Class<?>	find(String pattern, Object... ext)	Caches and returns a reference to the class specified by the pattern, or null.
static Class<?>	forName(String name)	Caches and returns a reference to the specified class, or throws an exception.
static <O> O	get(Class<O> clazz)	Returns a class instance.
static <O> O	get(Constructor<O> clazz, Object... args)	Returns a class instance or null.
static Object	get(Field field, Object object)	Returns the value of a field.
static Object	invoke(Method method, Object object, Object... args)	Invokes the specified method.
static Method	method(Class<?> clazz, String name, Class<?>... types)	Finds a public, protected or private method by name and parameter types.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

available

public static boolean available(String pattern,
                                Object... ext)

Checks if the class specified by the pattern is available.

Parameters:

pattern - class pattern

ext - optional extension

Returns:

result of check

find

public static Class<?> find(String name)

Caches and returns a reference to the specified class.

Parameters:

name - fully qualified class name

Returns:

reference, or null if the class is not found

forName

public static Class<?> forName(String name)
                        throws ClassNotFoundException

Caches and returns a reference to the specified class, or throws an exception.

Parameters:

name - fully qualified class name

Returns:

class reference

Throws:

ClassNotFoundException - any exception or error

field

public static Field field(Class<?> clazz,
                          String name)

Caches and returns a reference to the specified field or null.

Parameters:

clazz - class to search for the constructor

name - field name

Returns:

reference or null if the field is not found

find

public static Class<?> find(String pattern,
                            Object... ext)

Caches and returns a reference to the class specified by the pattern, or null.

Parameters:

pattern - class pattern

ext - optional extension

Returns:

reference or null if the class is not found

find

public static <O> Constructor<O> find(Class<O> clazz,
                                      Class<?>... types)

Caches and returns a constructor by parameter types.

Type Parameters:

O - class type

Parameters:

clazz - class to search for the constructor

types - constructor parameters

Returns:

constructor, or null if the constructor is not found

method

public static Method method(Class<?> clazz,
                            String name,
                            Class<?>... types)

Finds a public, protected or private method by name and parameter types.

Parameters:

clazz - class to search for the method

name - method name

types - method parameters

Returns:

method, or null if the method is not found

get

public static <O> O get(Class<O> clazz)

Returns a class instance.

Type Parameters:

O - type

Parameters:

clazz - class

Returns:

instance or null

get

public static <O> O get(Constructor<O> clazz,
                        Object... args)

Returns a class instance or null.

Type Parameters:

O - class type

Parameters:

clazz - class

args - arguments

Returns:

instance or null

invoke

public static Object invoke(Method method,
                            Object object,
                            Object... args)

Invokes the specified method.

Parameters:

method - method to run

object - object (null for static methods)

args - arguments

Returns:

result of method call or null

get

public static Object get(Field field,
                         Object object)

Returns the value of a field.

Parameters:

field - field to access

object - object (null for static methods)

Returns:

value of field