java.lang.Object
- com.exedio.cope.Feature
- - com.exedio.cope.Field<E>
  - - com.exedio.cope.FunctionField<E>
    - - com.exedio.cope.ItemField<E>

All Implemented Interfaces:

Copyable, Function<E>, ItemFunction<E>, Selectable<E>, Settable<E>, Serializable
```
public final class ItemField<E extends Item>
extends FunctionField<E>
implements ItemFunction<E>
```
See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class ItemField.DeletePolicy

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`appendSelect(com.exedio.cope.Statement bf, Join join)`	Deprecated. For internal use within COPE only.
`void`	`appendType(com.exedio.cope.Statement bf, Join join)`	Deprecated. For internal use within COPE only.
`<X extends Item> ItemField<X>`	`as(Class<X> clazz)`
`<X extends Item> ItemField<? extends X>`	`asExtends(Class<X> clazz)`
`<X extends Item> ItemField<? super X>`	`asSuper(Class<X> clazz)`
`ItemField<E>`	`cascade()`
`<X extends Item> ItemField<X>`	`cast(Class<X> clazz)`	Deprecated. Use `as(Class)` instead
`int`	`checkTypeColumn()`	Deprecated.
`long`	`checkTypeColumnL()`
`ItemField<E>`	`choice(String backPointerName)`	Causes this ItemField to create a `choice constraint`.
`ItemField<E>`	`copy()`
`ItemField<E>`	`copyFrom(ItemField<?> copyFrom)`
`ItemField<E>`	`copyTo(FunctionField<?> copyTo)`
`static <E extends Item> ItemField<E>`	`create(Class<E> valueClass)`
`static <E extends Item> ItemField<E>`	`create(Class<E> valueClass, ItemField.DeletePolicy policy)`
`static <E extends Item> ItemField<E>`	`create(Class<E> valueClass, TypeFuture<E> valueType, ItemField.DeletePolicy policy)`
`ItemField<E>`	`defaultTo(E defaultConstant)`	Deprecated. defaults make no sense for ItemField
`CopyConstraint`	`getChoice()`
`ItemField.DeletePolicy`	`getDeletePolicy()`
`String`	`getTypeColumnName()`	Deprecated. Use `SchemaInfo.getTypeColumnName(ItemField)` instead
`Type<E>`	`getValueType()`	Returns the type of items, this field accepts instances of.
`Type<E>`	`getValueType(Model model)`	Returns the same value as `getValueType()` for the model this field (and its `type`) is part of.
`boolean`	`needsCheckTypeColumn()`
`ItemField<E>`	`noCopyFrom()`	Returns a new FunctionField that differs from this FunctionField by having no `copyFrom` fields set.
`ItemField<E>`	`noDefault()`
`ItemField<E>`	`nonUnique()`
`ItemField<E>`	`nullify()`	Additionally makes the field `optional`.
`ItemField<E>`	`optional()`	Returns a new Field, that differs from this Field by being optional.
`ItemField<E>`	`toFinal()`	Returns a new Field, that differs from this Field by being final.
`ItemField<E>`	`unique()`	Returns a new FunctionField, that differs from this FunctionField by being unique.

Methods inherited from class com.exedio.cope.FunctionField
addCopyFrom, append, check, copy, copyFunctionField, get, get, getDefaultConstant, getImplicitCopyConstraint, getImplicitCopyConstraints, getImplicitUniqueConstraint, getInitialExceptions, getUniqueConstraints, hasDefault, isInitial, isRedundantByCopyConstraint, searchUnique, searchUnique, searchUniqueStrict, set

Methods inherited from class com.exedio.cope.Field
castCollection, check, execute, getColumnName, getInitialType, getPatterns, getValueClass, isFinal, isMandatory, mapNull

Methods inherited from class com.exedio.cope.Feature
afterModelCreated, getAbstractType, getAnnotation, getID, getLocalizationKeys, getName, getPattern, getType, isAnnotationPresent, isSourceAlready, mount, readResolve, requireMounted, toString, toString, writeReplace

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.exedio.cope.Function
any, between, equal, equal, equal, get, get, greater, greater, greaterOrEqual, greaterOrEqual, in, in, isNotNull, isNull, less, less, lessOrEqual, lessOrEqual, max, min, notEqual, notEqual

Methods inherited from interface com.exedio.cope.ItemFunction
bind, equalTarget, equalTarget, instanceOf, instanceOf, instanceOf, instanceOf, instanceOf, notInstanceOf, notInstanceOf, notInstanceOf, notInstanceOf, notInstanceOf, typeIn, typeIn, typeIn, typeIn, typeIn, typeNotIn, typeNotIn, typeNotIn, typeNotIn, typeNotIn

Methods inherited from interface com.exedio.cope.Selectable
append, check, getType, getValueClass, toString

Methods inherited from interface com.exedio.cope.Settable
map

- Method Detail
  - create
```
public static <E extends Item> ItemField<E> create(Class<E> valueClass)
```
  - create
```
public static <E extends Item> ItemField<E> create(Class<E> valueClass,
                                                   ItemField.DeletePolicy policy)
```
  - create
```
public static <E extends Item> ItemField<E> create(Class<E> valueClass,
                                                   TypeFuture<E> valueType,
                                                   ItemField.DeletePolicy policy)
```
  - copy
```
public ItemField<E> copy()
```
    Specified by:
    
    copy in class FunctionField<E extends Item>
  - toFinal
```
public ItemField<E> toFinal()
```
    Description copied from class: Field
    
    Returns a new Field, that differs from this Field by being final. If this Field is already final, the the result is equal to this Field.
    
    Specified by:
    
    toFinal in class FunctionField<E extends Item>
    
    See Also:
    
    Field.isFinal()
  - optional
```
public ItemField<E> optional()
```
    Description copied from class: Field
    
    Returns a new Field, that differs from this Field by being optional. If this Field is already optional, the the result is equal to this Field.
    
    Specified by:
    
    optional in class FunctionField<E extends Item>
    
    See Also:
    
    Field.isMandatory()
  - unique
```
public ItemField<E> unique()
```
    Description copied from class: FunctionField
    
    Returns a new FunctionField, that differs from this FunctionField by being unique. If this FunctionField is already unique, the the result is equal to this FunctionField.
    
    Specified by:
    
    unique in class FunctionField<E extends Item>
    
    See Also:
    
    FunctionField.getImplicitUniqueConstraint()
  - nonUnique
```
public ItemField<E> nonUnique()
```
    Specified by:
    
    nonUnique in class FunctionField<E extends Item>
  - copyFrom
```
public ItemField<E> copyFrom(ItemField<?> copyFrom)
```
    Specified by:
    
    copyFrom in class FunctionField<E extends Item>
    
    See Also:
    
    copyTo(FunctionField)
  - copyTo
```
public ItemField<E> copyTo(FunctionField<?> copyTo)
```
    See Also:
    
    FunctionField.copyFrom(ItemField)
  - noCopyFrom
```
public ItemField<E> noCopyFrom()
```
    Description copied from class: FunctionField
    
    Returns a new FunctionField that differs from this FunctionField by having no copyFrom fields set.
    
    Specified by:
    
    noCopyFrom in class FunctionField<E extends Item>
  - choice
```
public ItemField<E> choice(String backPointerName)
```
    Causes this ItemField to create a choice constraint.
    This ItemField becomes the target of the copy constraint. The field pointing back becomes the template, and Type.getThis() of the type of this ItemField becomes the copy.
    
    Parameters:
    
    backPointerName - the name of the field pointing back; at E, this has to be the name of an ItemField where the value type overlaps with this item field's Feature.getType()
  - noDefault
```
public ItemField<E> noDefault()
```
    Specified by:
    
    noDefault in class FunctionField<E extends Item>
  - nullify
```
public ItemField<E> nullify()
```
    Additionally makes the field optional.
  - cascade
```
public ItemField<E> cascade()
```
  - defaultTo
```
@Deprecated
public ItemField<E> defaultTo(E defaultConstant)
```
    Deprecated.
    defaults make no sense for ItemField
    
    Specified by:
    
    defaultTo in class FunctionField<E extends Item>
  - getChoice
```
public CopyConstraint getChoice()
```
  - as
```
public <X extends Item> ItemField<X> as(Class<X> clazz)
```
    See Also:
    
    asExtends(Class), asSuper(Class), EnumField.as(Class), Class.asSubclass(Class)
  - asExtends
```
public <X extends Item> ItemField<? extends X> asExtends(Class<X> clazz)
```
    See Also:
    
    as(Class), Class.asSubclass(Class)
  - asSuper
```
public <X extends Item> ItemField<? super X> asSuper(Class<X> clazz)
```
    See Also:
    
    as(Class)
  - getDeletePolicy
```
public ItemField.DeletePolicy getDeletePolicy()
```
  - getValueType
```
public Type<E> getValueType()
```
    Returns the type of items, this field accepts instances of.
    
    Specified by:
    
    getValueType in interface ItemFunction<E extends Item>
    
    Specified by:
    
    getValueType in interface Selectable<E extends Item>
  - getValueType
```
public Type<E> getValueType(Model model)
```
    Returns the same value as getValueType() for the model this field (and its type) is part of. For other models it returns the same value as getValueType() if this field (and its type) had been added to that model.
  - appendSelect
```
@Deprecated
public void appendSelect(com.exedio.cope.Statement bf,
                         Join join)
```
    Deprecated.
    For internal use within COPE only.
    
    Specified by:
    
    appendSelect in interface Selectable<E extends Item>
    
    Overrides:
    
    appendSelect in class FunctionField<E extends Item>
  - appendType
```
@Deprecated
public void appendType(com.exedio.cope.Statement bf,
                       Join join)
```
    Deprecated.
    For internal use within COPE only.
    
    Specified by:
    
    appendType in interface ItemFunction<E extends Item>
  - needsCheckTypeColumn
```
public boolean needsCheckTypeColumn()
```
    Specified by:
    
    needsCheckTypeColumn in interface ItemFunction<E extends Item>
    
    See Also:
    
    ItemFunction.checkTypeColumn()
  - checkTypeColumnL
```
public long checkTypeColumnL()
```
    Specified by:
    
    checkTypeColumnL in interface ItemFunction<E extends Item>
    
    See Also:
    
    ItemFunction.needsCheckTypeColumn()
  - checkTypeColumn
```
@Deprecated
public int checkTypeColumn()
```
    Deprecated.
    
    Specified by:
    
    checkTypeColumn in interface ItemFunction<E extends Item>
  - cast
```
@Deprecated
public <X extends Item> ItemField<X> cast(Class<X> clazz)
```
    Deprecated.
    Use as(Class) instead
  - getTypeColumnName
```
@Deprecated
public String getTypeColumnName()
```
    Deprecated.
    Use SchemaInfo.getTypeColumnName(ItemField) instead

Class ItemField<E extends Item>

Nested Class Summary

Method Summary

Methods inherited from class com.exedio.cope.FunctionField

Methods inherited from class com.exedio.cope.Field

Methods inherited from class com.exedio.cope.Feature

Methods inherited from class java.lang.Object

Methods inherited from interface com.exedio.cope.Function

Methods inherited from interface com.exedio.cope.ItemFunction

Methods inherited from interface com.exedio.cope.Selectable

Methods inherited from interface com.exedio.cope.Settable

Method Detail

create

create

create

copy

toFinal

optional

unique

nonUnique

copyFrom

copyTo

noCopyFrom

choice

noDefault

nullify

cascade

defaultTo

getChoice

as

asExtends

asSuper

getDeletePolicy

getValueType

getValueType

appendSelect

appendType

needsCheckTypeColumn

checkTypeColumnL

checkTypeColumn

cast

getTypeColumnName