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
`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
`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)`
`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)`
`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 claszz, 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)

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 primitve 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 claszz,
                       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)