Package org.codehaus.groovy.runtime

## Class MetaClassHelper

- java.lang.Object
- - org.codehaus.groovy.runtime.MetaClassHelper

-     public class MetaClassHelper
      extends Object

- - ### Field Summary

    Fields
    Modifier and Type | Field | 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 | Description
    --- | ---
    `MetaClassHelper()` |

  - ### Method Summary

    All Methods Static Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method | 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 String` | `convertPropertyName​(String prop)` | Converts a String into a standard property name.
    `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

          @Deprecated
          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

    - #### convertPropertyName

          public static String convertPropertyName​(String prop)

      Converts a String into a standard property name.
      Parameters:
        `prop` - the original name
      Returns:
        the converted name