com.github.andyshao.util.Reflects Maven / Gradle / Ivy
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package com.github.andyshao.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Set;
/**
*
* Title:the tool of java.lang.reflect
* Descript:
* With a easy way to use java.lang.reflect.*; For this class could avoid some
* exception which is
* the subclass of {@link Exception}.
* Convert the {@link Exception} or the subclass of {@link Exception} to
* {@link RuntimeException}.
* For example:
*
*
*
* try {
* return (Class<T>) Class.forName(className);
* } catch (ClassNotFoundException e) {
* throw new RuntimeException(e);
* }
*
*
*
* Any necessary about take the original exception, you could use this way:
*
*
*
* try {
* Class<String> clazz = Reflects.forName("java.lang.String");
* } catch (RuntimeException e) {
* Throwable throwable = e.getCause();
* if (throwable instanceof ClassNotFoundException) {
* // Do something
* }
* // For other things:
* throw e;
* }
*
*
*
*
* Copyright: Copryright(c) Mar 7, 2014
* Encoding:UNIX UTF-8
*
* @author Andy.Shao
*
*/
public final class Reflects {
/**
*
* @param className the name of class
* @param the type of class
* @return the type of class
* @see Class#forName(String)
*/
@SuppressWarnings("unchecked")
public static Class forName(String className) {
try {
return (Class) Class.forName(className);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param clazz the type of class
* @param parameterTypes the type of parameters of constructor of class
* @param the type of class
* @return the constructor of class
* @see Class#getConstructor(Class...)
*/
public static Constructor getConstructor(Class clazz , Class... parameterTypes) {
try {
return clazz.getConstructor(parameterTypes);
} catch (NoSuchMethodException | SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param clazz the type of class
* @param parameterTypes the typ of parameters of constructor of class
* @param the type of class
* @return the constructor of class
* @see Class#getDeclaredConstructor(Class...)
*/
public static Constructor getDeclaredConstructor(Class clazz , Class... parameterTypes) {
try {
return clazz.getDeclaredConstructor(parameterTypes);
} catch (NoSuchMethodException | SecurityException e) {
throw new RuntimeException(e);
}
}
/**
* if the clazz doesn't include the mtheod, it will check the super class.
*
* @param clazz the type of class
* @param field_name the name of field
* @return the field of class
* @see Class#getDeclaredField(String)
*/
public static Field superGetDeclaredField(Class clazz , String field_name) {
try {
return clazz.getDeclaredField(field_name);
} catch (NoSuchFieldException e) {
if (clazz.getSuperclass() != null) { return Reflects.superGetDeclaredField(clazz.getSuperclass() , field_name); }
throw new RuntimeException(e);
} catch (SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param clazz the type of class
* @param field_name the name of field
* @return the field of class
* @see Class#getDeclaredField(String)
*/
public static Field getDeclaredField(Class clazz , String field_name){
try {
return clazz.getDeclaredField(field_name);
} catch (NoSuchFieldException | SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param clazz the type of class
* @return the fields of class
* @see Class#getDeclaredField(String)
*/
public static Field[] superGetDeclaredFields(Class clazz){
Field[] result = new Field[0];
if(clazz.getSuperclass() != null){
Field[] fields = superGetDeclaredFields(clazz.getSuperclass());
result = ArrayTools.mergeArray(Field[].class, result, fields);
}
Field[] fields = clazz.getDeclaredFields();
result = ArrayTools.mergeArray(Field[].class, result, fields);
return result;
}
/**
* if the clazz doesn't include the mtheod, it will check the super class.
*
* @param clazz the type of class
* @param method_name the name of method
* @param parameterTypes the type of parameters
* @return the method of class
* @see Class#getDeclaredMethod(String, Class...)
*/
public static Method superGetDeclaredMethod(Class clazz , String method_name , Class... parameterTypes) {
try {
return clazz.getDeclaredMethod(method_name , parameterTypes);
} catch (NoSuchMethodException e) {
if (clazz.getSuperclass() != null) { return Reflects.superGetDeclaredMethod(clazz.getSuperclass() , method_name ,
parameterTypes); }
throw new RuntimeException(e);
} catch (SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param clazz the type of class
* @param method_name the name of method
* @param parameterTypes the type of parameters
* @return the method of class
* @see Class#getDeclaredMethod(String, Class...)
*/
public static Method getDeclaredMethod(Class clazz , String method_name , Class... parameterTypes){
try {
return clazz.getDeclaredMethod(method_name , parameterTypes);
} catch (NoSuchMethodException | SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param clazz the type of class
* @param field_name the name of field
* @return the fields of class
* @see Class#getField(String)
*/
public static Field getField(Class clazz , String field_name) {
try {
return clazz.getField(field_name);
} catch (NoSuchFieldException | SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param target the Object which store the value of field
* @param field the define of field
* @param the type of return
* @return the value of field
* @see Field#get(Object)
*/
@SuppressWarnings("unchecked")
public static T getFieldValue(Object target , Field field) {
try {
return (T) field.get(target);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**
* if the clazz has the super class then find the intefaces from super class.
* @param clazz The type of Object's
* @param set the collection which store all of interfaces about the clazz.
* @see Class#getInterfaces()
*/
public static void superGetInterfaces(Class clazz , Set> set) {
set.addAll(Arrays.asList(clazz.getInterfaces()));
if (clazz.getSuperclass() != null) {
Reflects.superGetInterfaces(clazz.getSuperclass() , set);
}
}
/**
* Only could find out the permission of method is public.
* @param clazz the type of object
* @param method_name the name of method
* @param parameterTypes the parameter types list
* @return the define of method
* @see Class#getMethod(String, Class...)
*/
public static Method getMethod(Class clazz , String method_name , Class... parameterTypes) {
try {
return clazz.getMethod(method_name , parameterTypes);
} catch (NoSuchMethodException | SecurityException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param target the object which should run the method
* @param method the define of method
* @param values the values of parameters of method's
* @param the type of return
* @return the result of method's
* @see Method#invoke(Object, Object...)
*/
@SuppressWarnings("unchecked")
public static T invoked(Object target , Method method , Object... values) {
try {
return (T) method.invoke(target , values);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param constructor the define of class' constructor
* @param values the values of parameters of constructor's
* @param the type of return
* @return the object which is builded from constructor
* @see Constructor#newInstance(Object...)
*/
public static T newInstance(Constructor constructor , Object... values) {
try {
return constructor.newInstance(values);
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param target the object which has define and value about field
* @param field the define of field
* @param value the values of parameters of constructor's
* @see Field#set(Object, Object)
*/
public static void setFieldValue(Object target , Field field , Object value) {
try {
field.set(target , value);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**
*
* @param target the object which has define and value about field
* @param clazz the type of object
* @param the type of return
* @return all of annotation
* @see Class#getAnnotation(Class)
*/
public static T superGetAnnotation(Class target , Class clazz) {
T annotation = target.getAnnotation(clazz);
if (annotation != null) { return annotation; }
if (target.isInterface()) {
Class[] interfaces = target.getInterfaces();
for (Class _interface : interfaces) {
annotation = Reflects.superGetAnnotation(_interface , clazz);
if (annotation != null) { return annotation; }
}
} else {
Class superClass = target.getSuperclass();
if (superClass != null) {
annotation = Reflects.superGetAnnotation(superClass , clazz);
if (annotation != null) { return annotation; }
}
Class[] interfaces = target.getInterfaces();
for (Class _interface : interfaces) {
annotation = Reflects.superGetAnnotation(_interface , clazz);
if (annotation != null) { return annotation; }
}
}
return annotation;
}
private Reflects() {
throw new AssertionError("No support instance " + Reflects.class.getName());
}
}