org.codehaus.jackson.map.util
Class ClassUtil

java.lang.Object
  extended by org.codehaus.jackson.map.util.ClassUtil

public final class ClassUtil
extends Object


Constructor Summary
ClassUtil()
           
 
Method Summary
static String canBeABeanType(Class<?> type)
           
static void checkAndFixAccess(Member member)
          Method called to check if we can use the passed method or constructor (wrt access restriction -- public methods can be called, others usually not); and if not, if there is a work-around for the problem.
static
<T> T
createInstance(Class<T> cls, boolean canFixAccess)
          Method that can be called to try to create an instantiate of specified type.
static Object defaultValue(Class<?> cls)
          Helper method used to get default value for wrappers used for primitive types (0 for Integer etc)
static
<T> Constructor<T>
findConstructor(Class<T> cls, boolean canFixAccess)
           
static Class<? extends Enum<?>> findEnumType(Class<?> cls)
          Helper method that can be used to dynamically figure out formal enumeration type (class) for given class of an enumeration value.
static Class<? extends Enum<?>> findEnumType(Enum<?> en)
          Helper method that can be used to dynamically figure out formal enumeration type (class) for given enumeration.
static Class<? extends Enum<?>> findEnumType(EnumMap<?,?> m)
          Helper method that can be used to dynamically figure out enumeration type of given EnumSet, without having access to its declaration.
static Class<? extends Enum<?>> findEnumType(EnumSet<?> s)
          Helper method that can be used to dynamically figure out enumeration type of given EnumSet, without having access to its declaration.
static List<Class<?>> findSuperTypes(Class<?> cls, Class<?> endBefore)
          Method that will find all sub-classes and implemented interfaces of a given class or interface.
static List<Class<?>> findSuperTypes(Class<?> cls, Class<?> endBefore, List<Class<?>> result)
           
static String getClassDescription(Object classOrInstance)
          Helper method used to construct appropriate description when passed either type (Class) or an instance; in latter case, class of instance is to be used.
static Class<?> getOuterClass(Class<?> type)
          Method for finding enclosing class for non-static inner classes
static Throwable getRootCause(Throwable t)
          Method that can be used to find the "root cause", innermost of chained (wrapped) exceptions.
static boolean hasGetterSignature(Method m)
           
static boolean isCollectionMapOrArray(Class<?> type)
           
static boolean isConcrete(Class<?> type)
          Helper method that checks if given class is a concrete one; that is, not an interface or abstract class.
static boolean isConcrete(Member member)
           
static String isLocalType(Class<?> type)
          Deprecated. since 1.9, use variant that takes second argument
static String isLocalType(Class<?> type, boolean allowNonStatic)
           
static boolean isProxyType(Class<?> type)
          Helper method used to weed out dynamic Proxy types; types that do not expose concrete method API that we could use to figure out automatic Bean (property) based serialization.
static void throwAsIAE(Throwable t)
          Method that will wrap 't' as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is
static void throwAsIAE(Throwable t, String msg)
          Method that will wrap 't' as an IllegalArgumentException (and with specified message) if it is a checked exception; otherwise (runtime exception or error) throw as is
static void throwRootCause(Throwable t)
          Method that will unwrap root causes of given Throwable, and throw the innermost Exception or Error as is.
static void unwrapAndThrowAsIAE(Throwable t)
          Method that will locate the innermost exception for given Throwable; and then wrap it as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is
static void unwrapAndThrowAsIAE(Throwable t, String msg)
          Method that will locate the innermost exception for given Throwable; and then wrap it as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is
static Class<?> wrapperType(Class<?> primitiveType)
          Helper method for finding wrapper type for given primitive type (why isn't there one in JDK?)
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ClassUtil

public ClassUtil()
Method Detail

findSuperTypes

public static List<Class<?>> findSuperTypes(Class<?> cls,
                                            Class<?> endBefore)
Method that will find all sub-classes and implemented interfaces of a given class or interface. Classes are listed in order of precedence, starting with the immediate super-class, followed by interfaces class directly declares to implemented, and then recursively followed by parent of super-class and so forth. Note that Object.class is not included in the list regardless of whether endBefore argument is defined or not.

Parameters:
endBefore - Super-type to NOT include in results, if any; when encountered, will be ignored (and no super types are checked).

findSuperTypes

public static List<Class<?>> findSuperTypes(Class<?> cls,
                                            Class<?> endBefore,
                                            List<Class<?>> result)

canBeABeanType

public static String canBeABeanType(Class<?> type)
Returns:
Null if class might be a bean; type String (that identifies why it's not a bean) if not

isLocalType

@Deprecated
public static String isLocalType(Class<?> type)
Deprecated. since 1.9, use variant that takes second argument


isLocalType

public static String isLocalType(Class<?> type,
                                 boolean allowNonStatic)
Since:
1.9

getOuterClass

public static Class<?> getOuterClass(Class<?> type)
Method for finding enclosing class for non-static inner classes

Since:
1.9

isProxyType

public static boolean isProxyType(Class<?> type)
Helper method used to weed out dynamic Proxy types; types that do not expose concrete method API that we could use to figure out automatic Bean (property) based serialization.


isConcrete

public static boolean isConcrete(Class<?> type)
Helper method that checks if given class is a concrete one; that is, not an interface or abstract class.


isConcrete

public static boolean isConcrete(Member member)
Since:
1.6

isCollectionMapOrArray

public static boolean isCollectionMapOrArray(Class<?> type)

getClassDescription

public static String getClassDescription(Object classOrInstance)
Helper method used to construct appropriate description when passed either type (Class) or an instance; in latter case, class of instance is to be used.


hasGetterSignature

public static boolean hasGetterSignature(Method m)

getRootCause

public static Throwable getRootCause(Throwable t)
Method that can be used to find the "root cause", innermost of chained (wrapped) exceptions.


throwRootCause

public static void throwRootCause(Throwable t)
                           throws Exception
Method that will unwrap root causes of given Throwable, and throw the innermost Exception or Error as is. This is useful in cases where mandatory wrapping is added, which is often done by Reflection API.

Throws:
Exception
Since:
1.7

throwAsIAE

public static void throwAsIAE(Throwable t)
Method that will wrap 't' as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is


throwAsIAE

public static void throwAsIAE(Throwable t,
                              String msg)
Method that will wrap 't' as an IllegalArgumentException (and with specified message) if it is a checked exception; otherwise (runtime exception or error) throw as is


unwrapAndThrowAsIAE

public static void unwrapAndThrowAsIAE(Throwable t)
Method that will locate the innermost exception for given Throwable; and then wrap it as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is


unwrapAndThrowAsIAE

public static void unwrapAndThrowAsIAE(Throwable t,
                                       String msg)
Method that will locate the innermost exception for given Throwable; and then wrap it as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is


createInstance

public static <T> T createInstance(Class<T> cls,
                                   boolean canFixAccess)
                        throws IllegalArgumentException
Method that can be called to try to create an instantiate of specified type. Instantiation is done using default no-argument constructor.

Parameters:
canFixAccess - Whether it is possible to try to change access rights of the default constructor (in case it is not publicly accessible) or not.
Throws:
IllegalArgumentException - If instantiation fails for any reason; except for cases where constructor throws an unchecked exception (which will be passed as is)

findConstructor

public static <T> Constructor<T> findConstructor(Class<T> cls,
                                                 boolean canFixAccess)
                                      throws IllegalArgumentException
Throws:
IllegalArgumentException

defaultValue

public static Object defaultValue(Class<?> cls)
Helper method used to get default value for wrappers used for primitive types (0 for Integer etc)

Since:
1.6.1

wrapperType

public static Class<?> wrapperType(Class<?> primitiveType)
Helper method for finding wrapper type for given primitive type (why isn't there one in JDK?)

Since:
1.7.1

checkAndFixAccess

public static void checkAndFixAccess(Member member)
Method called to check if we can use the passed method or constructor (wrt access restriction -- public methods can be called, others usually not); and if not, if there is a work-around for the problem.


findEnumType

public static Class<? extends Enum<?>> findEnumType(EnumSet<?> s)
Helper method that can be used to dynamically figure out enumeration type of given EnumSet, without having access to its declaration. Code is needed to work around design flaw in JDK.

Since:
1.5

findEnumType

public static Class<? extends Enum<?>> findEnumType(EnumMap<?,?> m)
Helper method that can be used to dynamically figure out enumeration type of given EnumSet, without having access to its declaration. Code is needed to work around design flaw in JDK.

Since:
1.5

findEnumType

public static Class<? extends Enum<?>> findEnumType(Enum<?> en)
Helper method that can be used to dynamically figure out formal enumeration type (class) for given enumeration. This is either class of enum instance (for "simple" enumerations), or its superclass (for enums with instance fields or methods)


findEnumType

public static Class<? extends Enum<?>> findEnumType(Class<?> cls)
Helper method that can be used to dynamically figure out formal enumeration type (class) for given class of an enumeration value. This is either class of enum instance (for "simple" enumerations), or its superclass (for enums with instance fields or methods)