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## net.sf.saxon.s9api
Class ItemTypeFactory

    java.lang.Object
      net.sf.saxon.s9api.ItemTypeFactory

    public class ItemTypeFactory

extends Object

This class is used for creating ItemType objects.

The `ItemTypeFactory` class is thread-safe.

Constructor Summary
`ItemTypeFactory(Processor processor)` Create an ItemTypeFactory

Method Summary
`ItemType` | `getAtomicType(QName name)` Get an item type representing an atomic type.
`ItemType` | `getAttributeTest(QName name, QName schemaType)` Get an ItemType that tests an element name and/or schema type.
`ItemType` | `getDocumentTest(ItemType elementTest)` Make an ItemType representing a document-node() test with an embedded element test.
`ItemType` | `getElementTest(QName name, QName schemaType, boolean nillable)` Make an ItemType that tests an element name and/or schema type.
`XdmAtomicValue` | `getExternalObject(Object object)` Factory method to construct an "external object".
`ItemType` | `getExternalObjectType(Class externalClass)` Get an ItemType representing the type of a Java object when used as an external object for use in conjunction with calls on extension/external functions.
`ItemType` | `getItemType(XdmItem item)` Get an ItemType representing the type of a supplied XdmItem.
`ItemType` | `getItemType(XdmNodeKind kind, QName name)` Get an item type that matches nodes of a specified kind with a specified name.
`ItemType` | `getNodeKindTest(XdmNodeKind kind)` Get an item type that matches any node of a specified kind.
`ItemType` | `getSchemaAttributeTest(QName name)` Get an ItemType representing an attribute declaration in the schema.
`ItemType` | `getSchemaElementTest(QName name)` Make an ItemType representing an element declaration in the schema.

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

Constructor Detail

### ItemTypeFactory

    public ItemTypeFactory(Processor processor)

  Create an ItemTypeFactory

  Parameters:
    `processor` - the processor used by this ItemTypeFactory. This must be supplied in the case of user-defined types or types that reference element or attribute names; for built-in types it can be omitted.

Method Detail

### getAtomicType

    public ItemType getAtomicType(QName name)
                           throws SaxonApiException

  Get an item type representing an atomic type. This may be a built-in type in the XML Schema namespace, or a user-defined atomic type. The resulting type will use the conversion rules configured for the supplied `Processor`.

  It is undefined whether two calls supplying the same QName will return the same ItemType object.

  Parameters:
    `name` - the name of the built-in or user-defined atomic type required
  Returns:
    an ItemType object representing this built-in or user-defined atomic type
  Throws:
    `SaxonApiException` - if the type name is not known, or if the type identified by the name is not an atomic type.

### getNodeKindTest

    public ItemType getNodeKindTest(XdmNodeKind kind)

  Get an item type that matches any node of a specified kind.

  This corresponds to the XPath syntactic forms element(), attribute(), document-node(), text(), comment(), processing-instruction(). It also provides an option, not available in the XPath syntax, that matches namespace nodes.

  It is undefined whether two calls supplying the same argument value will return the same ItemType object.

  Parameters:
    `kind` - the kind of node for which a NodeTest is required
  Returns:
    an item type corresponding to the specified kind of node

### getItemType

    public ItemType getItemType(XdmNodeKind kind,
                                QName name)

  Get an item type that matches nodes of a specified kind with a specified name.

  This corresponds to the XPath syntactic forms element(name), attribute(name), and processing-instruction(name). In the case of processing-instruction, the supplied QName must have no namespace.

  It is undefined whether two calls supplying the same argument values will return the same ItemType object.

  Parameters:
    `kind` - the kind of nodes that match
    `name` - the name of the nodes that match
  Returns:
    an ItemType that matches nodes of a given node kind with a given name
  Throws:
    `IllegalArgumentException` - if the node kind is other than element, attribute, or processing instruction, or if the node kind is processing instruction and the name is in a namespace.

### getSchemaElementTest

    public ItemType getSchemaElementTest(QName name)
                                  throws SaxonApiException

  Make an ItemType representing an element declaration in the schema. This is the equivalent of the XPath syntax `schema-element(element-name)`

  It is undefined whether two calls supplying the same argument values will return the same ItemType object.

  Parameters:
    `name` - the element name
  Returns:
    the ItemType
  Throws:
    `SaxonApiException` - if the schema does not contain a global element declaration for the given name

### getElementTest

    public ItemType getElementTest(QName name,
                                   QName schemaType,
                                   boolean nillable)
                            throws SaxonApiException

  Make an ItemType that tests an element name and/or schema type. This is the equivalent of the XPath syntax `element(element-name, type)`

  It is undefined whether two calls supplying the same argument values will return the same ItemType object.

  Parameters:
    `name` - the element name, or null if there is no constraint on the name (equivalent to specifying `element(*, type)`)
    `schemaType` - the name of the required schema type, or null if there is no constraint on the type (equivalent to specifying `element(name)`)
    `nillable` - if a nilled element is allowed to match the type (equivalent to specifying "?" after the type name). The value is ignored if schemaType is null.
  Returns:
    the constructed ItemType
  Throws:
    `SaxonApiException` - if the schema does not contain a global element declaration for the given name

### getSchemaAttributeTest

    public ItemType getSchemaAttributeTest(QName name)
                                    throws SaxonApiException

  Get an ItemType representing an attribute declaration in the schema. This is the equivalent of the XPath syntax `schema-attribute(attribute-name)`

  It is undefined whether two calls supplying the same argument values will return the same ItemType object.

  Parameters:
    `name` - the attribute name
  Returns:
    the ItemType
  Throws:
    `SaxonApiException` - if the schema does not contain a global attribute declaration for the given name

### getAttributeTest

    public ItemType getAttributeTest(QName name,
                                     QName schemaType)
                              throws SaxonApiException

  Get an ItemType that tests an element name and/or schema type. This is the equivalent of the XPath syntax `element(element-name, type)`

  It is undefined whether two calls supplying the same argument values will return the same ItemType object.

  Parameters:
    `name` - the element name, or null if there is no constraint on the name (equivalent to specifying `element(*, type)`)
    `schemaType` - the name of the required schema type, or null of there is no constraint on the type (equivalent to specifying `element(name)`)
  Returns:
    the constructed ItemType
  Throws:
    `SaxonApiException` - if the schema does not contain a global element declaration for the given name

### getDocumentTest

    public ItemType getDocumentTest(ItemType elementTest)

  Make an ItemType representing a document-node() test with an embedded element test. This reflects the XPath syntax `document-node(element(N, T))` or `document-node(schema-element(N))`.

  It is undefined whether two calls supplying the same argument values will return the same ItemType object.

  Parameters:
    `elementTest` - the elementTest. An IllegalArgumentException is thrown if the supplied ItemTest is not an elementTest or schemaElementTest.
  Returns:
    a new ItemType representing the document test

### getExternalObjectType

    public ItemType getExternalObjectType(Class externalClass)

  Get an ItemType representing the type of a Java object when used as an external object for use in conjunction with calls on extension/external functions.

  Parameters:
    `externalClass` - a Java class
  Returns:
    the ItemType representing the type of external objects of this class

### getExternalObject

    public XdmAtomicValue getExternalObject(Object object)

  Factory method to construct an "external object". This is an XDM value that wraps a Java object. Such values can be passed as parameters to stylesheets or queries, for use in conjunction with external (extension) functions.

  Each call on this method will return a distinct `XdmAtomicValue` object.

  Parameters:
    `object` - the value to be wrapped as an external object
  Returns:
    the object, wrapped as an XdmAtomicValue

### getItemType

    public ItemType getItemType(XdmItem item)

  Get an ItemType representing the type of a supplied XdmItem. If the supplied item is an atomic value, the returned ItemType will reflect the most specific atomic type of the item. If the supplied item is a node, the returned item type will reflect the node kind, and if the node has a name, then its name. It will not reflect the type annotation.

  Parameters:
    `item` - the supplied item whose type is required
  Returns:
    the type of the supplied item

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