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## org.codehaus.groovy.runtime
Class MetaClassHelper

author:
  John Wilson

author:
  Jochen Theodorou

Field Summary
`def` | `ARRAY_WITH_NULL`
`def` | `EMPTY_ARRAY`
`def` | `EMPTY_TYPE_ARRAY`
`Logger` | `LOG`
`int` | `MAX_ARG_LEN`
`def` | `PRIMITIVES`
`def` | `PRIMITIVE_DISTANCE_TABLE`
`int` | `VARGS_SHIFT`

Constructor Summary
`MetaClassHelper()`

Method Summary
`static boolean` | `accessibleToConstructor(Class at, Constructor constructor)`
`static Object` | `asPrimitiveArray(List list, Class parameterType)`
`static def` | `asWrapperArray(Object parameters, Class componentType)`
`static long` | `calculateParameterDistance(Class argument, CachedClass parameter)`
`static long` | `calculateParameterDistance(def arguments, ParameterTypes pt)`
`static int` | `calculateSimplifiedClassDistanceToObject(Class clazz)`
`static String` | `capitalize(String property)`
`static Boolean` | `checkCompatiblePackages(Class at, Constructor constructor)`
`static Object` | `chooseEmptyMethodParams(FastArray methods)` object (e.g.
`static Object` | `chooseMostGeneralMethodWith1NullParam(FastArray methods)` object (e.g.
`static boolean` | `containsMatchingMethod(List list, MetaMethod method)` list
`static def` | `convertToTypeArray(def args)` param instance array to the type array
`static GroovyRuntimeException` | `createExceptionText(String init, Constructor constructor, def argumentArray, Throwable e, boolean setReason)`
`static GroovyRuntimeException` | `createExceptionText(String init, MetaMethod method, Object object, def args, Throwable reason, boolean setReason)`
`static Object` | `doConstructorInvoke(CachedConstructor constructor, def argumentArray)`
`static Object` | `doMethodInvoke(Object object, MetaMethod method, def argumentArray)`
`static String` | `getClassName(Object object)`
`static int` | `getMaximumInterfaceDistance(Class c, Class interfaceClass)`
`static Closure` | `getMethodPointer(Object object, String methodName)` Returns a callable object for the given method name on the object.
`static ParameterTypes` | `getParameterTypes(Object methodOrConstructor)`
`static int` | `getPrimitiveDistance(Class from, Class to)`
`static int` | `getPrimitiveIndex(Class c)`
`static boolean` | `isAssignableFrom(Class classToTransformTo, Class classToTransformFrom)`
`static boolean` | `isGenericSetMethod(MetaMethod method)`
`static boolean` | `isSuperclass(Class claszz, Class superclass)`
`static boolean` | `isValidMethod(Object method, def arguments)`
`static void` | `logMethodCall(Object object, String methodName, def arguments)`
`static Object` | `makeArray(Object obj, Class secondary, int length)`
`static Object` | `makeCommonArray(def arguments, int offset, Class fallback)`
`static String` | `normalizedValue(Object argument)`
`static boolean` | `parametersAreCompatible(def arguments, def parameters)`
`static String` | `shortName(Object object)`
`static def` | `wrap(def classes)`

Constructor Detail

### MetaClassHelper

    MetaClassHelper()

Method Detail

### accessibleToConstructor

    public static boolean accessibleToConstructor(Class at, Constructor constructor)

### asPrimitiveArray

    public static Object asPrimitiveArray(List list, Class parameterType)

  param:
    list the original list
  param:
    parameterType the resulting array type
  return:
    the constructed array

### asWrapperArray

    public static def asWrapperArray(Object parameters, Class componentType)

### calculateParameterDistance

    static long calculateParameterDistance(Class argument, CachedClass parameter)

### calculateParameterDistance

    public static long calculateParameterDistance(def arguments, ParameterTypes pt)

### calculateSimplifiedClassDistanceToObject

    static int calculateSimplifiedClassDistanceToObject(Class clazz)

### capitalize

    public static String capitalize(String property)

### checkCompatiblePackages

    static Boolean checkCompatiblePackages(Class at, Constructor constructor)

### chooseEmptyMethodParams

    public static Object chooseEmptyMethodParams(FastArray methods)

  param:
    methods the methods to choose from
  return:
    the method with 1 parameter which takes the most general type of
  object (e.g. Object)

### chooseMostGeneralMethodWith1NullParam

    public static Object chooseMostGeneralMethodWith1NullParam(FastArray methods)

  param:
    methods the methods to choose from
  return:
    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)

  param:
    list a list of MetaMethods
  param:
    method the MetaMethod of interest
  return:
    true if a method of the same matching prototype was found in the
  list

### convertToTypeArray

    public static def convertToTypeArray(def args)

  param instance array to the type array
  param:
    args the arguments
  return:
    the types of the arguments

### createExceptionText

    static GroovyRuntimeException createExceptionText(String init, Constructor constructor, def argumentArray, Throwable e, boolean setReason)

### createExceptionText

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

### doConstructorInvoke

    public static Object doConstructorInvoke(CachedConstructor constructor, def argumentArray)

### doMethodInvoke

    public static Object doMethodInvoke(Object object, MetaMethod method, def argumentArray)

### getClassName

    static String getClassName(Object object)

### getMaximumInterfaceDistance

    static int getMaximumInterfaceDistance(Class c, Class interfaceClass)

### 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.
  param:
    object the object containing the method
  param:
    methodName the method of interest
  return:
    the resulting closure-like method pointer

### getParameterTypes

    public static ParameterTypes getParameterTypes(Object methodOrConstructor)

### getPrimitiveDistance

    static int getPrimitiveDistance(Class from, Class to)

### getPrimitiveIndex

    static int getPrimitiveIndex(Class c)

### isAssignableFrom

    public static boolean isAssignableFrom(Class classToTransformTo, Class classToTransformFrom)

### isGenericSetMethod

    public static boolean isGenericSetMethod(MetaMethod method)

### isSuperclass

    static boolean isSuperclass(Class claszz, Class superclass)

### isValidMethod

    public static boolean isValidMethod(Object method, def arguments)

### logMethodCall

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

### makeArray

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

### makeCommonArray

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

### normalizedValue

    static String normalizedValue(Object argument)

### parametersAreCompatible

    public static boolean parametersAreCompatible(def arguments, def parameters)

### shortName

    static String shortName(Object object)

### wrap

    public static def wrap(def classes)