org.codehaus.groovy.runtime

Class MetaClassHelper

java.lang.Object

org.codehaus.groovy.runtime.MetaClassHelper

public class MetaClassHelper
extends Object

Author:

John Wilson, Jochen Theodorou

Field Summary

Fields

Modifier and Type	Field and Description
static Object[]	ARRAY_WITH_NULL
static Object[]	EMPTY_ARRAY
static Class[]	EMPTY_CLASS_ARRAY
static Class[]	EMPTY_TYPE_ARRAY
protected static Logger	LOG

Constructor Summary

Constructors

Constructor and Description
MetaClassHelper()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	accessibleToConstructor(Class at, Constructor constructor)
static Object	asPrimitiveArray(List list, Class parameterType)
static Object[]	asWrapperArray(Object parameters, Class componentType)
static long	calculateParameterDistance(Class[] arguments, ParameterTypes pt)
static String	capitalize(String property) This is the complement to the java.beans.Introspector.decapitalize(String) method.
static Class[]	castArgumentsToClassArray(Object[] argTypes)
static Object	chooseEmptyMethodParams(FastArray methods)
static Object	chooseMostGeneralMethodWith1NullParam(FastArray methods) Deprecated.
static boolean	containsMatchingMethod(List list, MetaMethod method)
static Class[]	convertToTypeArray(Object[] args) param instance array to the type array
static GroovyRuntimeException	createExceptionText(String init, MetaMethod method, Object object, Object[] args, Throwable reason, boolean setReason)
static void	doSetMetaClass(Object self, MetaClass mc) Sets the meta class for an object, by delegating to the appropriate DefaultGroovyMethods helper method.
protected static String	getClassName(Object object)
static Closure	getMethodPointer(Object object, String methodName) Returns a callable object for the given method name on the object.
static boolean	isAssignableFrom(Class classToTransformTo, Class classToTransformFrom)
static boolean	isGenericSetMethod(MetaMethod method)
protected static boolean	isSuperclass(Class clazz, Class superclass)
static void	logMethodCall(Object object, String methodName, Object[] arguments)
static Object	makeArray(Object obj, Class secondary, int length)
static Object	makeCommonArray(Object[] arguments, int offset, Class fallback)
protected static String	normalizedValue(Object argument)
static boolean	parametersAreCompatible(Class[] arguments, Class[] parameters)
static boolean	sameClass(Class[] params, Object arg)
static boolean	sameClasses(Class[] params)
static boolean	sameClasses(Class[] params, Object arg1)
static boolean	sameClasses(Class[] params, Object[] arguments)
static boolean	sameClasses(Class[] params, Object[] arguments, boolean weakNullCheck)
static boolean	sameClasses(Class[] params, Object arg1, Object arg2)
static boolean	sameClasses(Class[] params, Object arg1, Object arg2, Object arg3)
static boolean	sameClasses(Class[] params, Object arg1, Object arg2, Object arg3, Object arg4)
protected static String	shortName(Object object)
static void	unwrap(Object[] arguments)
static Class[]	wrap(Class[] classes)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ARRAY

public static final Object[] EMPTY_ARRAY

EMPTY_TYPE_ARRAY

public static final Class[] EMPTY_TYPE_ARRAY

ARRAY_WITH_NULL

public static final Object[] ARRAY_WITH_NULL

LOG

protected static final Logger LOG

EMPTY_CLASS_ARRAY

public static final Class[] EMPTY_CLASS_ARRAY

Constructor Detail

MetaClassHelper

public MetaClassHelper()

Method Detail

accessibleToConstructor

public static boolean accessibleToConstructor(Class at,
                              Constructor constructor)

asWrapperArray

public static Object[] asWrapperArray(Object parameters,
                      Class componentType)

asPrimitiveArray

public static Object asPrimitiveArray(List list,
                      Class parameterType)

Parameters:

list - the original list

parameterType - the resulting array type

Returns:

the constructed array

calculateParameterDistance

public static long calculateParameterDistance(Class[] arguments,
                              ParameterTypes pt)

capitalize

public static String capitalize(String property)

This is the complement to the java.beans.Introspector.decapitalize(String) method. We handle names that begin with an initial lowerCase followed by upperCase specially (which is to make no change). See GROOVY-3211.

Parameters:

property - the property name to capitalize

Returns:

the name capitalized, except when we don't

chooseEmptyMethodParams

public static Object chooseEmptyMethodParams(FastArray methods)

Parameters:

methods - the methods to choose from

Returns:

the method with 1 parameter which takes the most general type of object (e.g. Object)

chooseMostGeneralMethodWith1NullParam

public static Object chooseMostGeneralMethodWith1NullParam(FastArray methods)

Deprecated.

Warning: this method does not choose properly if multiple methods with the same distance are encountered

Parameters:

methods - the methods to choose from

Returns:

the method with 1 parameter which takes the most general type of object (e.g. Object) ignoring primitive types

containsMatchingMethod

public static boolean containsMatchingMethod(List list,
                             MetaMethod method)

Parameters:

list - a list of MetaMethods

method - the MetaMethod of interest

Returns:

true if a method of the same matching prototype was found in the list

convertToTypeArray

public static Class[] convertToTypeArray(Object[] args)

param instance array to the type array

Parameters:

args - the arguments

Returns:

the types of the arguments

makeCommonArray

public static Object makeCommonArray(Object[] arguments,
                     int offset,
                     Class fallback)

makeArray

public static Object makeArray(Object obj,
               Class secondary,
               int length)

createExceptionText

public static GroovyRuntimeException createExceptionText(String init,
                                         MetaMethod method,
                                         Object object,
                                         Object[] args,
                                         Throwable reason,
                                         boolean setReason)

getClassName

protected static String getClassName(Object object)

getMethodPointer

public static Closure getMethodPointer(Object object,
                       String methodName)

Returns a callable object for the given method name on the object. The object acts like a Closure in that it can be called, like a closure and passed around - though really its a method pointer, not a closure per se.

Parameters:

object - the object containing the method

methodName - the method of interest

Returns:

the resulting closure-like method pointer

isAssignableFrom

public static boolean isAssignableFrom(Class classToTransformTo,
                       Class classToTransformFrom)

isGenericSetMethod

public static boolean isGenericSetMethod(MetaMethod method)

isSuperclass

protected static boolean isSuperclass(Class clazz,
                   Class superclass)

parametersAreCompatible

public static boolean parametersAreCompatible(Class[] arguments,
                              Class[] parameters)

logMethodCall

public static void logMethodCall(Object object,
                 String methodName,
                 Object[] arguments)

normalizedValue

protected static String normalizedValue(Object argument)

shortName

protected static String shortName(Object object)

wrap

public static Class[] wrap(Class[] classes)

sameClasses

public static boolean sameClasses(Class[] params,
                  Object[] arguments,
                  boolean weakNullCheck)

sameClasses

public static boolean sameClasses(Class[] params,
                  Object[] arguments)

sameClasses

public static boolean sameClasses(Class[] params)

sameClasses

public static boolean sameClasses(Class[] params,
                  Object arg1)

sameClasses

public static boolean sameClasses(Class[] params,
                  Object arg1,
                  Object arg2)

sameClasses

public static boolean sameClasses(Class[] params,
                  Object arg1,
                  Object arg2,
                  Object arg3)

sameClasses

public static boolean sameClasses(Class[] params,
                  Object arg1,
                  Object arg2,
                  Object arg3,
                  Object arg4)

sameClass

public static boolean sameClass(Class[] params,
                Object arg)

castArgumentsToClassArray

public static Class[] castArgumentsToClassArray(Object[] argTypes)

unwrap

public static void unwrap(Object[] arguments)

doSetMetaClass

public static void doSetMetaClass(Object self,
                  MetaClass mc)

Sets the meta class for an object, by delegating to the appropriate DefaultGroovyMethods helper method. This method was introduced as a breaking change in 2.0 to solve rare cases of stack overflow. See GROOVY-5285. The method is named doSetMetaClass in order to prevent misusages. Do not use this method directly unless you know what you do.

Parameters:

self - the object for which to set the meta class

mc - the metaclass