PJConverter.ToZeroOrOne (saxon JavaDoc)

java.lang.Object
- net.sf.saxon.expr.PJConverter
- - net.sf.saxon.expr.PJConverter.ToZeroOrOne

Enclosing class:

PJConverter
```
public static class PJConverter.ToZeroOrOne
extends PJConverter
```
Converter for use when the target class is ZeroOrOne, which constrains the value to be a singleton or an empty sequence

Nested Class Summary
- Nested classes/interfaces inherited from class net.sf.saxon.expr.PJConverter
  PJConverter.AnyURIValueToURI, PJConverter.AnyURIValueToURL, PJConverter.Atomic, PJConverter.BooleanValueToBoolean, PJConverter.CalendarValueToCalendar, PJConverter.CalendarValueToDate, PJConverter.CalendarValueToInstant, PJConverter.CalendarValueToZonedDateTime, PJConverter.General, PJConverter.Identity, PJConverter.IntegerValueToBigInteger, PJConverter.IntegerValueToByte, PJConverter.IntegerValueToChar, PJConverter.IntegerValueToInt, PJConverter.IntegerValueToLong, PJConverter.IntegerValueToShort, PJConverter.NumericValueToBigDecimal, PJConverter.NumericValueToDouble, PJConverter.NumericValueToFloat, PJConverter.QualifiedNameValueToQName, PJConverter.StringValueToChar, PJConverter.StringValueToString, PJConverter.ToArray, PJConverter.ToCollection, PJConverter.ToNull, PJConverter.ToOne, PJConverter.ToOneOrMore, PJConverter.ToSequenceExtent, PJConverter.ToSequenceIterator, PJConverter.ToZeroOrMore, PJConverter.ToZeroOrOne, PJConverter.UnwrapExternalObject

Field Summary

Fields
Modifier and Type Field Description

static PJConverter.ToZeroOrOne INSTANCE

Constructor Summary

Constructors
Constructor Description

ToZeroOrOne()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`ZeroOrOne<Item<?>>`	`convert(Sequence<?> value, Class<?> targetClass, XPathContext context)`	Convert an XPath value to a Java value of a specified class

Methods inherited from class net.sf.saxon.expr.PJConverter
allocate, allocateNodeListCreator, getEquivalentSequenceType, getParameterizedSequenceType

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

- Field Detail
  - INSTANCE
```
public static final PJConverter.ToZeroOrOne INSTANCE
```
- Constructor Detail
  - ToZeroOrOne
```
public ToZeroOrOne()
```
- Method Detail
  - convert
```
public ZeroOrOne<Item<?>> convert(Sequence<?> value,
                                  Class<?> targetClass,
                                  XPathContext context)
                           throws XPathException
```
    Description copied from class: PJConverter
    
    Convert an XPath value to a Java value of a specified class
    
    Specified by:
    
    convert in class PJConverter
    
    Parameters:
    
    value - the supplied XPath value
    
    targetClass - the class of the required Java value
    
    context - the XPath dynamic context
    
    Returns:
    
    the corresponding Java value, which is guaranteed to be an instance of the target class (except that an empty sequence is converted to null)
    
    Throws:
    
    XPathException - if the conversion is not possible or fails