java.lang.Object
- swim.structure.Item
- - swim.structure.Value
  - - swim.structure.Absent

All Implemented Interfaces:

Comparable<Item>, Iterable<Item>, Debug, Display
```
public final class Absent
extends Value
```

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Absent`	`absent()`
`Item`	`and(Item that)`
`Value`	`and(Value that)`
`Record`	`appended(Object... items)`
`Record`	`appended(Item item)`
`boolean`	`booleanValue()`	Always returns `false` because `Absent` behaves like a falsey value.
`boolean`	`booleanValue(boolean orElse)`	Always returns `false` because `Absent` behaves like a falsey value.
`int`	`compareTo(Item other)`
`Record`	`concat(Item that)`
`Item`	`conditional(Item thenTerm, Item elseTerm)`
`Value`	`conditional(Value thenTerm, Value elseTerm)`
`<T> Output<T>`	`debug(Output<T> output)`	Writes a developer readable, debug-formatted string representation of this object to `output`.
`boolean`	`equals(Object other)`
`int`	`hashCode()`
`boolean`	`isConstant()`	Returns `true` if this `Item` always `evaluates` to the same `Item`.
`boolean`	`isDefined()`	Always returns `false` because `Absent` represents an undefined value.
`boolean`	`isDefinite()`	Always returns `false` because `Absent` is not a definite value.
`boolean`	`isDistinct()`	Always returns `false` because `Absent` is not a distinct value.
`Iterator<Item>`	`iterator()`
`Value`	`not()`
`Item`	`or(Item that)`
`Value`	`or(Value that)`
`Record`	`prepended(Object... items)`
`Record`	`prepended(Item item)`
`int`	`typeOrder()`	Returns the heterogeneous sort order of this `Item`.
`Record`	`unflattened()`	Always returns an empty `Record` because `Absent` is not a distinct value.
`Record`	`updated(Value key, Value value)`
`Record`	`updatedAttr(Text key, Value value)`
`Record`	`updatedSlot(Value key, Value value)`

Methods inherited from class swim.structure.Value
alias, bitwiseAnd, bitwiseAnd, bitwiseNot, bitwiseOr, bitwiseOr, bitwiseXor, bitwiseXor, body, branch, builder, byteValue, byteValue, charValue, charValue, commit, contains, containsKey, containsKey, containsValue, divide, divide, doubleValue, doubleValue, empty, eq, eq, extant, flattened, floatValue, floatValue, fromObject, ge, ge, get, get, getAttr, getAttr, getField, getField, getItem, getSlot, getSlot, gt, gt, head, header, headers, integerValue, integerValue, intValue, intValue, inverse, isAliased, isMutable, key, keyEquals, lambda, le, le, length, longValue, longValue, lt, lt, minus, minus, modulo, modulo, ne, ne, negative, numberValue, numberValue, plus, plus, positive, removed, removed, shortValue, shortValue, stringValue, stringValue, tag, tail, target, times, times, toValue

Methods inherited from class swim.structure.Item
appended, appended, appended, appended, appended, appended, cast, cast, coerce, coerce, display, evaluate, evaluate, filter, filter, globalScope, invoke, max, min, precedence, prepended, prepended, prepended, prepended, prepended, prepended, substitute, substitute, toString, updated, updated, updated, updated, updated, updated, updated, updated, updated, updated, updated, updated, updated, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedAttr, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot, updatedSlot

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

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Method Detail
  - isDefined
```
public boolean isDefined()
```
    Always returns false because Absent represents an undefined value.
    
    Overrides:
    
    isDefined in class Value
  - isDefinite
```
public boolean isDefinite()
```
    Always returns false because Absent is not a definite value.
    
    Overrides:
    
    isDefinite in class Value
  - isConstant
```
public boolean isConstant()
```
    Description copied from class: Item
    
    Returns true if this Item always evaluates to the same Item.
    
    Specified by:
    
    isConstant in class Item
  - isDistinct
```
public boolean isDistinct()
```
    Always returns false because Absent is not a distinct value.
    
    Overrides:
    
    isDistinct in class Value
  - unflattened
```
public Record unflattened()
```
    Always returns an empty Record because Absent is not a distinct value.
    
    Overrides:
    
    unflattened in class Value
  - updated
```
public Record updated(Value key,
                      Value value)
```
    Overrides:
    
    updated in class Item
  - updatedAttr
```
public Record updatedAttr(Text key,
                          Value value)
```
    Overrides:
    
    updatedAttr in class Item
  - updatedSlot
```
public Record updatedSlot(Value key,
                          Value value)
```
    Overrides:
    
    updatedSlot in class Item
  - appended
```
public Record appended(Item item)
```
    Overrides:
    
    appended in class Item
  - appended
```
public Record appended(Object... items)
```
    Overrides:
    
    appended in class Item
  - prepended
```
public Record prepended(Item item)
```
    Overrides:
    
    prepended in class Item
  - prepended
```
public Record prepended(Object... items)
```
    Overrides:
    
    prepended in class Item
  - concat
```
public Record concat(Item that)
```
    Overrides:
    
    concat in class Item
  - conditional
```
public Item conditional(Item thenTerm,
                        Item elseTerm)
```
    Overrides:
    
    conditional in class Value
  - conditional
```
public Value conditional(Value thenTerm,
                         Value elseTerm)
```
    Overrides:
    
    conditional in class Value
  - or
```
public Item or(Item that)
```
    Overrides:
    
    or in class Value
  - or
```
public Value or(Value that)
```
    Overrides:
    
    or in class Value
  - and
```
public Item and(Item that)
```
    Overrides:
    
    and in class Value
  - and
```
public Value and(Value that)
```
    Overrides:
    
    and in class Value
  - not
```
public Value not()
```
    Overrides:
    
    not in class Value
  - booleanValue
```
public boolean booleanValue()
```
    Always returns false because Absent behaves like a falsey value.
    
    Overrides:
    
    booleanValue in class Value
  - booleanValue
```
public boolean booleanValue(boolean orElse)
```
    Always returns false because Absent behaves like a falsey value.
    
    Overrides:
    
    booleanValue in class Value
  - iterator
```
public Iterator<Item> iterator()
```
    Specified by:
    
    iterator in interface Iterable<Item>
    
    Overrides:
    
    iterator in class Item
  - typeOrder
```
public int typeOrder()
```
    Description copied from class: Item
    
    Returns the heterogeneous sort order of this Item. Used to impose a total order on the set of all items. When comparing two items of different types, the items order according to their typeOrder.
    
    Specified by:
    
    typeOrder in class Item
  - compareTo
```
public int compareTo(Item other)
```
    Specified by:
    
    compareTo in interface Comparable<Item>
    
    Specified by:
    
    compareTo in class Item
  - equals
```
public boolean equals(Object other)
```
    Specified by:
    
    equals in class Item
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in class Item
  - debug
```
public <T> Output<T> debug(Output<T> output)
```
    Description copied from interface: Debug
    
    Writes a developer readable, debug-formatted string representation of this object to output.
    
    Specified by:
    
    debug in interface Debug
    
    Specified by:
    
    debug in class Item
    
    Returns:
    
    the continuation of the output.
  - absent
```
public static Absent absent()
```

Class Absent

Method Summary

Methods inherited from class swim.structure.Value

Methods inherited from class swim.structure.Item

Methods inherited from class java.lang.Object

Methods inherited from interface java.lang.Iterable

Method Detail

isDefined

isDefinite

isConstant

isDistinct

unflattened

updated

updatedAttr

updatedSlot

appended

appended

prepended

prepended

concat

conditional

conditional

or

or

and

and

not

booleanValue

booleanValue

iterator

typeOrder

compareTo

equals

hashCode

debug

absent