com.sun.jersey.core.reflection
Class ReflectionHelper

java.lang.Object
  com.sun.jersey.core.reflection.ReflectionHelper

public class ReflectionHelper
extends java.lang.Object

Utility methods for Java reflection.

Author:

Paul.Sandoz@Sun.Com

Nested Class Summary

static class

ReflectionHelper.ClassTypePair A tuple consisting of a class and type of the class.

Constructor Summary

ReflectionHelper()

Method Summary

static java.lang.Class	classForName(java.lang.String name) Get the Class from the class name.
static java.lang.Class	getGenericClass(java.lang.reflect.Type parameterizedType) Get the class that is the type argument of a parameterized type.
static java.lang.reflect.Constructor	getStringConstructor(java.lang.Class c) Get the constructor that has a single parameter of String.
static java.lang.reflect.Method	getValueOfStringMethod(java.lang.Class c) Get the static valueOf(String ) method.
static ReflectionHelper.ClassTypePair	resolveTypeVariable(java.lang.Class c, java.lang.Class dc, java.lang.reflect.TypeVariable tv) Given a type variable resolve the Java class of that variable.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionHelper

public ReflectionHelper()

Method Detail

classForName

public static java.lang.Class classForName(java.lang.String name)

Get the Class from the class name.

The context class loader of the current thread is used, if null then the ClassLoader.getSystemClassLoader() is utilized.

Parameters:

name - the class name.

Returns:

the Class.

getGenericClass

public static java.lang.Class getGenericClass(java.lang.reflect.Type parameterizedType)
                                       throws java.lang.IllegalArgumentException

Get the class that is the type argument of a parameterized type.

Parameters:

parameterizedType - must be an instance of ParameterizedType and have exactly one type argument.

Returns:

the class of the actual type argument. If the type argument is a class then the class is returned. If the type argument is a generic array type and the generic component type is a class then class of the array is returned. If the parameterizedType is not an instance of ParameterizedType or contains more than one type argument null is returned.

Throws:

java.lang.IllegalArgumentException - if the single type argument is not of a class or a generic array type, or the generic component type of the generic array type is not class.

getValueOfStringMethod

public static java.lang.reflect.Method getValueOfStringMethod(java.lang.Class c)

Get the static valueOf(String ) method.

Parameters:

c - The class to obtain the method.

Returns:

the method, otherwise null if the method is not present.

getStringConstructor

public static java.lang.reflect.Constructor getStringConstructor(java.lang.Class c)

Get the constructor that has a single parameter of String.

Parameters:

c - The class to obtain the constructor.

Returns:

the constructor, otherwise null if the constructor is not present.

resolveTypeVariable

public static ReflectionHelper.ClassTypePair resolveTypeVariable(java.lang.Class c,
                                                                 java.lang.Class dc,
                                                                 java.lang.reflect.TypeVariable tv)

Given a type variable resolve the Java class of that variable.

Parameters:

c - the concrete class from which all type variables are resolved

dc - the declaring class where the type variable was defined

tv - the type variable

Returns:

the resolved Java class and type, otherwise null if the type variable could not be resolved