Interface ItemType

All Superinterfaces:
Serializable
All Known Subinterfaces:
AtomicType
All Known Implementing Classes:
AnyChildNodePattern, AnyItemType, AnyNodeTest, BuiltInAtomicType, CombinedNodeTest, ContentTypeTest, DocumentNodeTest, ExternalObjectType, IdrefTest, LocalNameTest, NamespaceTest, NameTest, NodeKindTest, NodeTest, NoNodeTest, SubstitutionGroupTest

public interface ItemType extends Serializable
ItemType is an interface that allows testing of whether an Item conforms to an expected type. ItemType represents the types in the type hierarchy in the XPath model, as distinct from the schema model: an item type is either item() (matches everything), a node type (matches nodes), an atomic type (matches atomic values), or empty() (matches nothing). Atomic types, represented by the class AtomicType, are also instances of SimpleType in the schema type heirarchy. Node Types, represented by the class NodeTest, are also Patterns as used in XSLT.
See Also:
  • Method Summary

    Modifier and Type
    Method
    Description
    Get the item type of the atomic values that will be produced when an item of this type is atomized
    Get the primitive item type corresponding to this item type.
    int
    Get the primitive type corresponding to this item type.
    Get the type from which this item type is derived by restriction.
    boolean
    Determine whether this item type is atomic (that is, whether it can ONLY match atomic values)
    boolean
    matchesItem(Item item, boolean allowURIPromotion, Configuration config)
    Test whether a given item conforms to this type
    Produce a representation of this type name for use in error messages.
  • Method Details

    • isAtomicType

      boolean isAtomicType()
      Determine whether this item type is atomic (that is, whether it can ONLY match atomic values)
      Returns:
      true if this is ANY_ATOMIC_TYPE or a subtype thereof
    • matchesItem

      boolean matchesItem(Item item, boolean allowURIPromotion, Configuration config)
      Test whether a given item conforms to this type
      Parameters:
      item - The item to be tested
      allowURIPromotion -
      config -
      Returns:
      true if the item is an instance of this type; false otherwise
    • getSuperType

      ItemType getSuperType(TypeHierarchy th)
      Get the type from which this item type is derived by restriction. This is the supertype in the XPath type heirarchy, as distinct from the Schema base type: this means that the supertype of xs:boolean is xdt:anyAtomicType, whose supertype is item() (rather than xs:anySimpleType).

      In fact the concept of "supertype" is not really well-defined, because the types form a lattice rather than a hierarchy. The only real requirement on this function is that it returns a type that strictly subsumes this type, ideally as narrowly as possible.

      Parameters:
      th -
      Returns:
      the supertype, or null if this type is item()
    • getPrimitiveItemType

      ItemType getPrimitiveItemType()
      Get the primitive item type corresponding to this item type. For item(), this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds, it is the value representing the node kind, for example Type.ELEMENT. For anyAtomicValue it is Type.ATOMIC_VALUE. For numeric it is Type.NUMBER. For other atomic types it is the primitive type as defined in XML Schema, except that INTEGER is considered to be a primitive type.
    • getPrimitiveType

      int getPrimitiveType()
      Get the primitive type corresponding to this item type. For item(), this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds, it is the value representing the node kind, for example Type.ELEMENT. For anyAtomicValue it is Type.ATOMIC_VALUE. For numeric it is Type.NUMBER. For other atomic types it is the primitive type as defined in XML Schema, except that INTEGER is considered to be a primitive type.
    • toString

      String toString(NamePool pool)
      Produce a representation of this type name for use in error messages. Where this is a QName, it will use conventional prefixes
    • getAtomizedItemType

      AtomicType getAtomizedItemType()
      Get the item type of the atomic values that will be produced when an item of this type is atomized