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## net.sf.saxon.value
Class ObjectValue

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

All Implemented Interfaces:
  Serializable, PullEvent, SequenceIterable, GroundedValue, Item, ValueRepresentation, ConversionResult

    public class ObjectValue

extends AtomicValue

An XPath value that encapsulates a Java object. Such a value can only be obtained by calling an extension function that returns it.

See Also:
  Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.value.AtomicValue
`typeLabel`

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

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

Constructor Summary
`ObjectValue()` Default constructor for use in subclasses
`ObjectValue(Object object)` Constructor
`ObjectValue(Object object, ExternalObjectType type)` Constructor

Method Summary
`ConversionResult` | `convertPrimitive(BuiltInAtomicType requiredType, boolean validate, ConversionRules rules)` Convert to target data type
`AtomicValue` | `copyAsSubType(AtomicType typeLabel)` Create a copy of this atomic value, with a different type label
`String` | `displayTypeName()` Display the type name for use in error messages
`boolean` | `effectiveBooleanValue()` Get the effective boolean value of the value
`boolean` | `equals(Object other)` Determine if two ObjectValues are equal
`ItemType` | `getItemType(TypeHierarchy th)` Determine the data type of the items in the expression, if possible
`Object` | `getObject()` Get the encapsulated object
`CharSequence` | `getPrimitiveStringValue()` Get the value as a String
`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.
`Object` | `getXPathComparable(boolean ordered, StringCollator collator, XPathContext context)` Get an object value that implements the XPath equality and ordering comparison semantics for this value.
`int` | `hashCode()`
`void` | `setValue(Object value)` Set the value in this object value

Methods inherited from class net.sf.saxon.value.AtomicValue
`asAtomic, checkPermittedContents, convert, convert, convert, getCardinality, getComponent, getLength, getStringValue, getStringValueCS, getTypedValue, getTypeLabel, isIdentical, isNaN, itemAt, iterate, process, setTypeLabel, subsequence, toString`

Methods inherited from class net.sf.saxon.value.Value
`asItem, asItem, asIterator, asValue, convertToJava, fromItem, getCanonicalLexicalRepresentation, getIterator, iterate, reduce`

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

Constructor Detail

### ObjectValue

    public ObjectValue()

  Default constructor for use in subclasses

### ObjectValue

    public ObjectValue(Object object)

  Constructor

  Parameters:
    `object` - the object to be encapsulated

### ObjectValue

    public ObjectValue(Object object,
                       ExternalObjectType type)

  Constructor

  Parameters:
    `object` - the object to be encapsulated
    `type` - the type of the external object

Method Detail

### setValue

    public void setValue(Object value)

  Set the value in this object value

  Parameters:
    `value` - the external value to be wrapped

### copyAsSubType

    public AtomicValue copyAsSubType(AtomicType typeLabel)

  Create a copy of this atomic value, with a different type label

  Specified by:
    `copyAsSubType` in class `AtomicValue`
  Parameters:
    `typeLabel` - the type label of the new copy. The caller is responsible for checking that the value actually conforms to this type.
  Returns:
    the copied 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

### getItemType

    public ItemType getItemType(TypeHierarchy th)

  Determine the data type of the items in the expression, if possible

  Overrides:
    `getItemType` in class `AtomicValue`
  Parameters:
    `th` - The TypeHierarchy.
  Returns:
    for the default implementation: AnyItemType (not known)

### displayTypeName

    public String displayTypeName()

  Display the type name for use in error messages

  Returns:
    the type name

### convertPrimitive

    public ConversionResult convertPrimitive(BuiltInAtomicType requiredType,
                                             boolean validate,
                                             ConversionRules rules)

  Convert to target data type

  Specified by:
    `convertPrimitive` in class `AtomicValue`
  Parameters:
    `requiredType` - the required atomic type. This must either be a primitive type, or a built-in type derived from the same primitive type as this atomic value.
    `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:
    the result of the conversion, if successful. If unsuccessful, the value returned will be a ValidationFailure. The caller must check for this condition. No exception is thrown, instead the exception information will be encapsulated within the ValidationFailure.

### getPrimitiveStringValue

    public CharSequence getPrimitiveStringValue()

  Get the value as a String

  Specified by:
    `getPrimitiveStringValue` in class `AtomicValue`
  Returns:
    a String representation of the value

### effectiveBooleanValue

    public boolean effectiveBooleanValue()
                                  throws XPathException

  Get the effective boolean value of the value

  Overrides:
    `effectiveBooleanValue` in class `AtomicValue`
  Returns:
    true, unless the value is boolean false, numeric zero, or zero-length string
  Throws:
    `XPathException` - if any dynamic error occurs evaluating the expression

### getObject

    public Object getObject()

  Get the encapsulated object

  Returns:
    the Java object that this external object wraps

### getSchemaComparable

    public Comparable getSchemaComparable()

  Description copied from class: `AtomicValue`
  Get a Comparable value that implements the XML Schema ordering comparison semantics for this value. An implementation must be provided for all 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. This value is also returned when two values of different types are compared.

  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 an object value that implements the XPath equality and ordering comparison semantics for this value. If the ordered parameter is set to true, the result will be a Comparable and will support a compareTo() method with the semantics of the XPath lt/gt operator, provided that the other operand is also obtained using the getXPathComparable() method. In all cases the result will support equals() and hashCode() methods that support the semantics of the XPath eq operator, again provided that the other operand is also obtained using the getXPathComparable() method. A context argument is supplied for use in cases where the comparison semantics are context-sensitive, for example where they depend on the implicit timezone or the default collation.

  Specified by:
    `getXPathComparable` in class `AtomicValue`
  Parameters:
    `ordered` - true if an ordered comparison is required. In this case the result is null if the type is unordered; in other cases the returned value will be a Comparable.
    `collator` -
    `context` - the XPath dynamic evaluation context, used in cases where the comparison is context sensitive @return an Object whose equals() and hashCode() methods implement the XPath comparison semantics
  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

### equals

    public boolean equals(Object other)

  Determine if two ObjectValues are equal

  Specified by:
    `equals` in class `AtomicValue`
  Parameters:
    `other` - the other value
  Returns:
    true if the other operand is an atomic value and the two values are equal as defined by the XPath eq operator
  Throws:
    `ClassCastException` - if they are not comparable

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Value`

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Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.