net.sf.saxon.value
Class BooleanValue

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.BooleanValue

All Implemented Interfaces:

Serializable, Comparable, PullEvent, SequenceIterable, GroundedValue, Item, ValueRepresentation, ConversionResult

public final class BooleanValue
extends AtomicValue
implements Comparable

A boolean XPath value

See Also:

Serialized Form

Field Summary

static BooleanValue	FALSE The boolean value FALSE
static BooleanValue	TRUE The boolean value TRUE

Fields inherited from class net.sf.saxon.value.Value

EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Constructor Summary

BooleanValue(boolean value, AtomicType typeLabel)
Create a new Boolean value with a user-supplied type label.

Method Summary

int	compareTo(Object other) Compare the value to another boolean value
ConversionResult	convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) Convert to target data type
Object	convertToJava(Class target, XPathContext context) Convert to Java object (for passing to external functions)
AtomicValue	copyAsSubType(AtomicType typeLabel) Create a copy of this atomic value (usually so that the type label can be changed).
boolean	effectiveBooleanValue() Get the effective boolean value of this expression
boolean	equals(Object other) Determine whether two boolean values are equal
static ConversionResult	fromString(CharSequence s) Convert a string to a boolean value, using the XML Schema rules (including whitespace trimming)
static BooleanValue	get(boolean value) Factory method: get a BooleanValue
boolean	getBooleanValue() Get the value
BuiltInAtomicType	getPrimitiveType() Determine the primitive type of the value.
Comparable	getSchemaComparable() Get a Comparable value that implements the XML Schema ordering comparison semantics for this value.
String	getStringValue() Convert to string
Object	getXPathComparable(boolean ordered, StringCollator collator, XPathContext context) Get a Comparable value that implements the XPath ordering comparison semantics for this value.
int	hashCode() Get a hash code for comparing two BooleanValues
String	toString() Diagnostic display of this value as a string

Methods inherited from class net.sf.saxon.value.AtomicValue

asAtomic, checkPermittedContents, convert, convert, getCardinality, getComponent, getItemType, getLength, getStringValueCS, getTypedValue, getTypeLabel, isNaN, itemAt, iterate, process, setTypeLabel, subsequence

Methods inherited from class net.sf.saxon.value.Value

asItem, asItem, asIterator, asValue, convertJavaObjectToXPath, convertToJava, fromItem, getCanonicalLexicalRepresentation, getIterator, iterate, makeQNameValue, reduce, stringToNumber

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

TRUE

public static final BooleanValue TRUE

The boolean value TRUE

FALSE

public static final BooleanValue FALSE

The boolean value FALSE

Constructor Detail

BooleanValue

public BooleanValue(boolean value,
                    AtomicType typeLabel)

Create a new Boolean value with a user-supplied type label. It is the caller's responsibility to ensure that the value is valid for the subtype

Parameters:

value - the boolean value

typeLabel - the type label, xs:boolean or a subtype

Method Detail

get

public static BooleanValue get(boolean value)

Factory method: get a BooleanValue

Parameters:

value - true or false, to determine which boolean value is required

Returns:

the BooleanValue requested

copyAsSubType

public AtomicValue copyAsSubType(AtomicType typeLabel)

Create a copy of this atomic value (usually so that the type label can be changed). The type label of the copy will be reset to the primitive type.

Specified by:

copyAsSubType in class AtomicValue

Parameters:

typeLabel - the atomic type label to be added to the copied value

Returns:

the copied value

fromString

public static ConversionResult fromString(CharSequence s)

Convert a string to a boolean value, using the XML Schema rules (including whitespace trimming)

Parameters:

s - the input string

Returns:

the relevant BooleanValue if validation succeeds; or a ValidationFailure if not.

getBooleanValue

public boolean getBooleanValue()

Get the value

Returns:

true or false, the actual boolean value of this BooleanValue

effectiveBooleanValue

public boolean effectiveBooleanValue()

Get the effective boolean value of this expression

Overrides:

effectiveBooleanValue in class AtomicValue

Returns:

the boolean value

getPrimitiveType

public BuiltInAtomicType getPrimitiveType()

Determine the primitive type of the value. This delivers the same answer as getItemType().getPrimitiveItemType(). The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration, and xs:untypedAtomic. For external objects, the result is AnyAtomicType.

Specified by:

getPrimitiveType in class AtomicValue

Returns:

the primitive type

convertPrimitive

public ConversionResult convertPrimitive(BuiltInAtomicType requiredType,
                                         boolean validate,
                                         XPathContext context)

Convert to target data type

Parameters:

requiredType - an integer identifying the required atomic type

context - XPath dynamic context

validate - true if validation is required. If set to false, the caller guarantees that the value is valid for the target data type, and that further validation is therefore not required. Note that a validation failure may be reported even if validation was not requested.

Returns:

an AtomicValue, a value of the required type

getStringValue

public String getStringValue()

Convert to string

Specified by:

getStringValue in interface Item

Specified by:

getStringValue in interface ValueRepresentation

Specified by:

getStringValue in class AtomicValue

Returns:

"true" or "false"

See Also:

Item.getStringValueCS()

convertToJava

public Object convertToJava(Class target,
                            XPathContext context)
                     throws XPathException

Convert to Java object (for passing to external functions)

Overrides:

convertToJava in class Value

Parameters:

target - the Java class to which conversion is required

context - the XPath dynamic evaluation context

Returns:

An object of the specified Java class

Throws:

XPathException - if conversion is not possible or fails

getSchemaComparable

public Comparable getSchemaComparable()

Get a Comparable value that implements the XML Schema ordering comparison semantics for this value. The default implementation returns "this". This is overridden for particular atomic types.

In the case of data types that are partially ordered, the returned Comparable extends the standard semantics of the compareTo() method by returning the value Value.INDETERMINATE_ORDERING when there is no defined order relationship between two given values.

Specified by:

getSchemaComparable in class AtomicValue

Returns:

a Comparable that follows XML Schema comparison rules

getXPathComparable

public Object getXPathComparable(boolean ordered,
                                 StringCollator collator,
                                 XPathContext context)

Get a Comparable value that implements the XPath ordering comparison semantics for this value. Returns null if the value is not comparable according to XPath rules. The default implementation returns null. This is overridden for types that allow ordered comparisons in XPath: numeric, boolean, string, date, time, dateTime, yearMonthDuration, dayTimeDuration, and anyURI.

Specified by:

getXPathComparable in class AtomicValue

Parameters:

ordered -

collator -

context -

Returns:

an Object whose equals() and hashCode() methods implement the XPath comparison semantics with respect to this atomic value. If ordered is specified, the result will either be null if no ordering is defined, or will be a Comparable

compareTo

public int compareTo(Object other)

Compare the value to another boolean value

Specified by:

compareTo in interface Comparable

Parameters:

other - The other boolean value

Returns:

-1 if this one is the lower, 0 if they are equal, +1 if this one is the higher. False is considered to be less than true.

Throws:

ClassCastException - if the other value is not a BooleanValue (the parameter is declared as Object to satisfy the Comparable interface)

equals

public boolean equals(Object other)

Determine whether two boolean values are equal

Specified by:

equals in class AtomicValue

Parameters:

other - the value to be compared to this value

Returns:

true if the other value is a boolean value and is equal to this value

Throws:

ClassCastException - if other value is not xs:boolean or derived therefrom

hashCode

public int hashCode()

Get a hash code for comparing two BooleanValues

Overrides:

hashCode in class Object

Returns:

the hash code

toString

public String toString()

Diagnostic display of this value as a string

Overrides:

toString in class AtomicValue

Returns:

a string representation of this value: "true()" or "false()"