java.lang.Object
- net.sf.saxon.type.UType

```
public class UType
extends java.lang.Object
```
A UType is a union of primitive (atomic, node, or function) item types. It is represented as a simple integer, with bits representing which of the primitive types are present in the union.

Field Summary

Fields
Modifier and Type	Field	Description
`static UType`	`ANY`
`static UType`	`ANY_ATOMIC`
`static UType`	`ANY_NODE`
`static UType`	`ANY_URI`
`static UType`	`ATTRIBUTE`
`static UType`	`BASE64_BINARY`
`static UType`	`BOOLEAN`
`static UType`	`CHILD_NODE_KINDS`
`static UType`	`COMMENT`
`static UType`	`DATE`
`static UType`	`DATE_TIME`
`static UType`	`DECIMAL`
`static UType`	`DOCUMENT`
`static UType`	`DOUBLE`
`static UType`	`DURATION`
`static UType`	`ELEMENT`
`static UType`	`ELEMENT_OR_ATTRIBUTE`
`static UType`	`EXTENSION`
`static UType`	`FLOAT`
`static UType`	`FUNCTION`
`static UType`	`G_DAY`
`static UType`	`G_MONTH`
`static UType`	`G_MONTH_DAY`
`static UType`	`G_YEAR`
`static UType`	`G_YEAR_MONTH`
`static UType`	`HEX_BINARY`
`static UType`	`NAMESPACE`
`static UType`	`NOTATION`
`static UType`	`NUMERIC`
`static UType`	`PARENT_NODE_KINDS`
`static UType`	`PI`
`static UType`	`QNAME`
`static UType`	`STRING`
`static UType`	`STRING_LIKE`
`static UType`	`TEXT`
`static UType`	`TIME`
`static UType`	`UNTYPED_ATOMIC`
`static UType`	`VOID`

Constructor Summary

Constructors
Constructor Description

UType(int bits)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.Set<PrimitiveUType>`	`decompose()`	Get a set containing all the primitive types in this UType
`boolean`	`equals(java.lang.Object obj)`	Indicates whether some other object is "equal to" this one.
`UType`	`except(UType other)`
`static UType`	`fromTypeCode(int code)`
`static UType`	`getUType(GroundedValue sequence)`	Get the UType of a Sequence
`static UType`	`getUType(Item item)`	Get the UType of an Item
`int`	`hashCode()`	Returns a hash code value for the object.
`UType`	`intersection(UType other)`
`static boolean`	`isGenerallyComparable(UType t1, UType t2)`	Determine whether two primitive atomic types are comparable under the rules for GeneralComparisons for the "=" operator (that is, untyped atomic values treated as comparable to anything)
`static boolean`	`isGuaranteedComparable(UType t1, UType t2)`	Determine whether two primitive atomic types are comparable under the rules for ValueComparisons (that is, untyped atomic values treated as strings), using the "eq" operator
`static boolean`	`isPossiblyComparable(UType t1, UType t2, boolean ordered)`	Determine whether two primitive atomic types are comparable under the rules for ValueComparisons (that is, untyped atomic values treated as strings)
`boolean`	`matches(Item item)`	Ask whether a given Item is an instance of this UType
`boolean`	`overlaps(UType other)`	Determine whether two UTypes have overlapping membership
`boolean`	`subsumes(UType other)`	Ask whether one UType subsumes another
`ItemType`	`toItemType()`	Obtain (that is, create or get) an itemType that matches all items whose primitive type is one of the types present in this UType.
`java.lang.String`	`toString()`	Produce a string representation of a UType
`java.lang.String`	`toStringWithIndefiniteArticle()`
`UType`	`union(UType other)`	Form a UType as the union of two other UTypes

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

- Field Detail
  - VOID
```
public static final UType VOID
```
  - DOCUMENT
```
public static final UType DOCUMENT
```
  - ELEMENT
```
public static final UType ELEMENT
```
  - ATTRIBUTE
```
public static final UType ATTRIBUTE
```
  - TEXT
```
public static final UType TEXT
```
  - COMMENT
```
public static final UType COMMENT
```
  - PI
```
public static final UType PI
```
  - NAMESPACE
```
public static final UType NAMESPACE
```
  - FUNCTION
```
public static final UType FUNCTION
```
  - STRING
```
public static final UType STRING
```
  - BOOLEAN
```
public static final UType BOOLEAN
```
  - DECIMAL
```
public static final UType DECIMAL
```
  - FLOAT
```
public static final UType FLOAT
```
  - DOUBLE
```
public static final UType DOUBLE
```
  - DURATION
```
public static final UType DURATION
```
  - DATE_TIME
```
public static final UType DATE_TIME
```
  - TIME
```
public static final UType TIME
```
  - DATE
```
public static final UType DATE
```
  - G_YEAR_MONTH
```
public static final UType G_YEAR_MONTH
```
  - G_YEAR
```
public static final UType G_YEAR
```
  - G_MONTH_DAY
```
public static final UType G_MONTH_DAY
```
  - G_DAY
```
public static final UType G_DAY
```
  - G_MONTH
```
public static final UType G_MONTH
```
  - HEX_BINARY
```
public static final UType HEX_BINARY
```
  - BASE64_BINARY
```
public static final UType BASE64_BINARY
```
  - ANY_URI
```
public static final UType ANY_URI
```
  - QNAME
```
public static final UType QNAME
```
  - NOTATION
```
public static final UType NOTATION
```
  - UNTYPED_ATOMIC
```
public static final UType UNTYPED_ATOMIC
```
  - EXTENSION
```
public static final UType EXTENSION
```
  - NUMERIC
```
public static final UType NUMERIC
```
  - STRING_LIKE
```
public static final UType STRING_LIKE
```
  - CHILD_NODE_KINDS
```
public static final UType CHILD_NODE_KINDS
```
  - PARENT_NODE_KINDS
```
public static final UType PARENT_NODE_KINDS
```
  - ELEMENT_OR_ATTRIBUTE
```
public static final UType ELEMENT_OR_ATTRIBUTE
```
  - ANY_NODE
```
public static final UType ANY_NODE
```
  - ANY_ATOMIC
```
public static final UType ANY_ATOMIC
```
  - ANY
```
public static final UType ANY
```
- Constructor Detail
  - UType
```
public UType(int bits)
```
- Method Detail
  - hashCode
```
public int hashCode()
```
    Returns a hash code value for the object.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    a hash code value for this object.
    
    See Also:
    
    Object.equals(Object), Hashtable
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Indicates whether some other object is "equal to" this one.
    
    Overrides:
    
    equals in class java.lang.Object
    
    Parameters:
    
    obj - the reference object with which to compare.
    
    Returns:
    
    true if this object is the same as the obj argument; false otherwise.
    
    See Also:
    
    hashCode(), Hashtable
  - union
```
public UType union(UType other)
```
    Form a UType as the union of two other UTypes
    
    Parameters:
    
    other - the other UType
    
    Returns:
    
    the UType representing the union of this UType and the other UType
  - intersection
```
public UType intersection(UType other)
```
  - except
```
public UType except(UType other)
```
  - fromTypeCode
```
public static UType fromTypeCode(int code)
```
  - decompose
```
public java.util.Set<PrimitiveUType> decompose()
```
    Get a set containing all the primitive types in this UType
    
    Returns:
    
    a set of PrimitiveUTypes each of which represents exactly one primitive type
  - toString
```
public java.lang.String toString()
```
    Produce a string representation of a UType
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    the string representation
  - toStringWithIndefiniteArticle
```
public java.lang.String toStringWithIndefiniteArticle()
```
  - overlaps
```
public boolean overlaps(UType other)
```
    Determine whether two UTypes have overlapping membership
    
    Parameters:
    
    other - the second UType
    
    Returns:
    
    true if the intersection between the two UTypes is non-empty
  - subsumes
```
public boolean subsumes(UType other)
```
    Ask whether one UType subsumes another
    
    Parameters:
    
    other - the second UType
    
    Returns:
    
    true if every item type allowed by this UType is also allowed by the other item type
  - toItemType
```
public ItemType toItemType()
```
    Obtain (that is, create or get) an itemType that matches all items whose primitive type is one of the types present in this UType.
    
    Returns:
    
    a corresponding ItemType
  - matches
```
public boolean matches(Item item)
```
    Ask whether a given Item is an instance of this UType
    
    Parameters:
    
    item - the item to be tested
    
    Returns:
    
    true if this UType matches the supplied item
  - getUType
```
public static UType getUType(Item item)
```
    Get the UType of an Item
    
    Parameters:
    
    item - the item whose UType is required
    
    Returns:
    
    the UType of the item
  - getUType
```
public static UType getUType(GroundedValue sequence)
```
    Get the UType of a Sequence
    
    Parameters:
    
    sequence - the sequence whose UType is required
    
    Returns:
    
    the UType of the item
  - isPossiblyComparable
```
public static boolean isPossiblyComparable(UType t1,
                                           UType t2,
                                           boolean ordered)
```
    Determine whether two primitive atomic types are comparable under the rules for ValueComparisons (that is, untyped atomic values treated as strings)
    
    Parameters:
    
    t1 - the first type to compared. This must be a primitive atomic type as defined by ItemType.getPrimitiveType()
    
    t2 - the second type to compared. This must be a primitive atomic type as defined by ItemType.getPrimitiveType()
    
    ordered - true if testing for an ordering comparison (lt, gt, le, ge). False if testing for an equality comparison (eq, ne)
    
    Returns:
    
    true if the types are guaranteed comparable, as defined by the rules of the "eq" operator, or if we don't yet know (because some subtypes of the static type are comparable and others are not). False if they are definitely not comparable.
  - isGuaranteedComparable
```
public static boolean isGuaranteedComparable(UType t1,
                                             UType t2)
```
    Determine whether two primitive atomic types are comparable under the rules for ValueComparisons (that is, untyped atomic values treated as strings), using the "eq" operator
    
    Parameters:
    
    t1 - the first type to compared. This must be a primitive atomic type as defined by ItemType.getPrimitiveType()
    
    t2 - the second type to compared. This must be a primitive atomic type as defined by ItemType.getPrimitiveType()
    
    Returns:
    
    true if the types are comparable, as defined by the rules of the "eq" operator; false if they are not comparable, or if we don't yet know (because some subtypes of the static type are comparable and others are not)
  - isGenerallyComparable
```
public static boolean isGenerallyComparable(UType t1,
                                            UType t2)
```
    Determine whether two primitive atomic types are comparable under the rules for GeneralComparisons for the "=" operator (that is, untyped atomic values treated as comparable to anything)
    
    Parameters:
    
    t1 - the first type to compared. This must be a primitive atomic type as defined by ItemType.getPrimitiveType()
    
    t2 - the second type to compared. This must be a primitive atomic type as defined by ItemType.getPrimitiveType()
    
    Returns:
    
    true if the types are comparable, as defined by the rules of the "=" operator

Class UType

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

VOID

DOCUMENT

ELEMENT

ATTRIBUTE

TEXT

COMMENT

PI

NAMESPACE

FUNCTION

STRING

BOOLEAN

DECIMAL

FLOAT

DOUBLE

DURATION

DATE_TIME

TIME

DATE

G_YEAR_MONTH

G_YEAR

G_MONTH_DAY

G_DAY

G_MONTH

HEX_BINARY

BASE64_BINARY

ANY_URI

QNAME

NOTATION

UNTYPED_ATOMIC

EXTENSION

NUMERIC

STRING_LIKE

CHILD_NODE_KINDS

PARENT_NODE_KINDS

ELEMENT_OR_ATTRIBUTE

ANY_NODE

ANY_ATOMIC

ANY

Constructor Detail

UType

Method Detail

hashCode

equals

union

intersection

except

fromTypeCode

decompose

toString

toStringWithIndefiniteArticle

overlaps

subsumes

toItemType

matches

getUType

getUType

isPossiblyComparable

isGuaranteedComparable

isGenerallyComparable