Package org.operaton.bpm.engine.impl.util

Class ReflectUtil

java.lang.Object

org.operaton.bpm.engine.impl.util.ReflectUtil

public final class ReflectUtil
extends Object

Author:

Tom Baeyens

Method Summary

Modifier and Type	Method	Description
static <T> T	createInstance(Class<? extends T> clazz)
static ClassLoader	getClassLoader()
static Field	getField(String fieldName, Class<?> clazz)	Returns the field of the given class or null if it doesnt exist.
static Field	getField(String fieldName, Object object)	Returns the field of the given object or null if it doesnt exist.
static Optional<Object>	getFieldValue(Field field, Object object)	Returns the value of the given field on the given object.
static Method	getMethod(Class<?> declaringType, String methodName, Class<?>... parameterTypes)	Finds a method by name and parameter types.
static URL	getResource(String name)
static InputStream	getResourceAsStream(String name)
static String	getResourceUrlAsString(String name)
static Method	getSetter(String fieldName, Class<?> clazz, Class<?> fieldType)	Returns the setter-method for the given field name or null if no setter exists.
static Method	getSingleSetter(String fieldName, Class<?> clazz)	Returns a setter method based on the fieldName and the java beans setter naming convention or null if none exists.
static <T> T	instantiate(Class<T> type)
static Object	instantiate(String className)
static Object	instantiate(String className, Object[] args)
static Object	invoke(Object target, String methodName, Object[] args)
static Class<?>	loadClass(String className)
static <T> Class<? extends T>	loadClass(String className, ClassLoader customClassloader)
static void	setField(Field field, Object object, Object value)
static URI	urlToURI(URL url)	Converts an url to an uri.

Methods inherited from class java.lang.Object

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

Method Details

getClassLoader

public static ClassLoader getClassLoader()

loadClass

public static Class<?> loadClass(String className)

loadClass

public static <T> Class<? extends T> loadClass(String className,
 ClassLoader customClassloader)
                                        throws ClassNotFoundException,
ClassCastException

Throws:

ClassNotFoundException

ClassCastException

getResourceAsStream

public static InputStream getResourceAsStream(String name)

getResource

public static URL getResource(String name)

getResourceUrlAsString

public static String getResourceUrlAsString(String name)

urlToURI

public static URI urlToURI(URL url)

Converts an url to an uri. Escapes whitespaces if needed.

Parameters:

url - the url to convert

Returns:

the resulting uri

Throws:

ProcessEngineException - if the url has invalid syntax

instantiate

public static Object instantiate(String className)

instantiate

public static <T> T instantiate(Class<T> type)

createInstance

public static <T> T createInstance(Class<? extends T> clazz)

invoke

public static Object invoke(Object target,
 String methodName,
 Object[] args)

getField

public static Field getField(String fieldName,
 Object object)

Returns the field of the given object or null if it doesnt exist.

getField

public static Field getField(String fieldName,
 Class<?> clazz)

Returns the field of the given class or null if it doesnt exist.

getFieldValue

public static Optional<Object> getFieldValue(Field field,
 Object object)

Returns the value of the given field on the given object. If the field is not accessible, it will be made accessible for the duration of the call.

Parameters:

field - the field to get the value from

object - the object to get the field value from

Returns:

the field value wrapped in an Optional, or an empty Optional if the field value is null

Since:

1.1

setField

public static void setField(Field field,
 Object object,
 Object value)

getSetter

public static Method getSetter(String fieldName,
 Class<?> clazz,
 Class<?> fieldType)

Returns the setter-method for the given field name or null if no setter exists.

getSingleSetter

public static Method getSingleSetter(String fieldName,
 Class<?> clazz)

Returns a setter method based on the fieldName and the java beans setter naming convention or null if none exists. If multiple setters with different parameter types are present, an exception is thrown. If they have the same parameter type, one of those methods is returned.

instantiate

public static Object instantiate(String className,
 Object[] args)

getMethod

public static Method getMethod(Class<?> declaringType,
 String methodName,
 Class<?>... parameterTypes)

Finds a method by name and parameter types.

Parameters:

declaringType - the name of the class

methodName - the name of the method to look for

parameterTypes - the types of the parameters