org.mmbase.util.functions
Class ReturnType<C>

java.lang.Object
  org.mmbase.core.AbstractDescriptor
      org.mmbase.util.functions.Parameter<C>
          org.mmbase.util.functions.ReturnType<C>

All Implemented Interfaces:

Serializable, Cloneable, Descriptor, PublicCloneable<AbstractDescriptor>

public class ReturnType<C>
extends Parameter<C>
implements Serializable

Description of the return type of certain function. This wraps a Class object but it has some extra members. Can be used as a constructor argument of Function objects or as an argument of Function.setReturnType(org.mmbase.util.functions.ReturnType).

Since:

MMBase-1.7

Version:

$Id: ReturnType.java 41943 2010-04-16 17:18:19Z michiel $

Author:

Daniel Ockeloen, Michiel Meeuwissen

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.mmbase.util.functions.Parameter

Parameter.Wrapper

Field Summary

static ReturnType<Boolean>	BOOLEAN The return type of a function that returns a Boolean.
static ReturnType<CharSequence>	CHARSEQUENCE
static ReturnType<Collection<?>>	COLLECTION The return type of a function that returns a Set.
static ReturnType<Double>	DOUBLE The return type of a function that returns a Double.
static ReturnType<Integer>	INTEGER The return type of a function that returns a Integer.
static ReturnType<List>	LIST The return type of a function that returns a List.
static ReturnType<Long>	LONG The return type of a function that returns a Long.
static ReturnType<Map<?,?>>	MAP The return type of a function that returns a Map.
static ReturnType<Node>	NODE The return type of a function that returns a Node.
static ReturnType<NodeList>	NODELIST The return type of a function that returns a NodeList.
static ReturnType<Object>	NONE The return type of a function is None
static ReturnType<Set<?>>	SET The return type of a function that returns a Set.
static ReturnType<String>	STRING The return type of a function that returns a String.
static ReturnType<Object>	UNKNOWN The return type of a function is unknown.
static ReturnType<Void>	VOID The return type of a function that does not return a thing.
static Object	VOID_VALUE Can be return by functions that don't want to return anything.

Fields inherited from class org.mmbase.util.functions.Parameter

CLOUD, CORENODE, dataType, EMPTY, FIELD, LANGUAGE, LOCALE, REQUEST, RESPONSE, USER

Fields inherited from class org.mmbase.core.AbstractDescriptor

description, guiName, key

Constructor Summary

ReturnType(Class type, String description)

Method Summary

ReturnType	addSubType(String name, ReturnType type) If the return type is like a map or struct (key-values pairs), then you might want to describe the types of the values seperately too.
static ReturnType<?>	getReturnType(Class<?> type)
Map<String,ReturnType>	getSubTypes()
boolean	isRequired() Returns whether the parameter requires a value.
String	toString()

Methods inherited from class org.mmbase.util.functions.Parameter

autoCast, checkType, emptyArray, equals, getClass, getClassForName, getDataType, getDefaultValue, getTypeAsClass, hashCode, matches, readArrayFromXml, readFromXml, setDefaultValue

Methods inherited from class org.mmbase.core.AbstractDescriptor

clone, clone, getDefaultLocale, getDescription, getDescription, getGUIName, getGUIName, getLocalizedDescription, getLocalizedGUIName, getName, setDescription, setDescription, setGUIName, setGUIName, setLocalizedDescription, setLocalizedGUIName

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

VOID

public static final ReturnType<Void> VOID

The return type of a function that does not return a thing.

STRING

public static final ReturnType<String> STRING

The return type of a function that returns a String.

CHARSEQUENCE

public static final ReturnType<CharSequence> CHARSEQUENCE

INTEGER

public static final ReturnType<Integer> INTEGER

The return type of a function that returns a Integer.

LONG

public static final ReturnType<Long> LONG

The return type of a function that returns a Long.

DOUBLE

public static final ReturnType<Double> DOUBLE

The return type of a function that returns a Double.

BOOLEAN

public static final ReturnType<Boolean> BOOLEAN

The return type of a function that returns a Boolean.

LIST

public static final ReturnType<List> LIST

The return type of a function that returns a List.

NODELIST

public static final ReturnType<NodeList> NODELIST

The return type of a function that returns a NodeList.

NODE

public static final ReturnType<Node> NODE

The return type of a function that returns a Node.

SET

public static final ReturnType<Set<?>> SET

The return type of a function that returns a Set.

COLLECTION

public static final ReturnType<Collection<?>> COLLECTION

The return type of a function that returns a Set.

MAP

public static final ReturnType<Map<?,?>> MAP

The return type of a function that returns a Map.

UNKNOWN

public static final ReturnType<Object> UNKNOWN

The return type of a function is unknown.

NONE

public static final ReturnType<Object> NONE

The return type of a function is None

VOID_VALUE

public static final Object VOID_VALUE

Can be return by functions that don't want to return anything. (The function framework requires you to return something).

Constructor Detail

ReturnType

public ReturnType(Class type,
                  String description)

Method Detail

getReturnType

public static final ReturnType<?> getReturnType(Class<?> type)

Since:

MMBase-1.9

isRequired

public boolean isRequired()

Description copied from class: Parameter

Returns whether the parameter requires a value.

Overrides:

isRequired in class Parameter<C>

Returns:

true if a value is required

addSubType

public ReturnType addSubType(String name,
                             ReturnType type)

If the return type is like a map or struct (key-values pairs), then you might want to describe the types of the values seperately too.

getSubTypes

public Map<String,ReturnType> getSubTypes()

Returns:

Unmodifiable Map containing the 'subtypes' in case the type is Map. An empty Map otherwise.

toString

public String toString()

Overrides:

toString in class Parameter<C>