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## net.sf.saxon.type
Class TypeHierarchy

    java.lang.Object
      net.sf.saxon.type.TypeHierarchy

All Implemented Interfaces:
  java.io.Serializable

    public class TypeHierarchy

extends java.lang.Object
implements java.io.Serializable

This class exists to provide answers to questions about the type hierarchy. Because such questions are potentially expensive, it caches the answers. There is one instance of this class for a Configuration.

See Also:
  Serialized Form

Field Summary
`static int` | `DISJOINT` Constant denoting relationship between two types: A is disjoint from B
`static int` | `OVERLAPS` Constant denoting relationship between two types: A overlaps B
`static int` | `SAME_TYPE` Constant denoting relationship between two types: A is the same type as B
`static int` | `SUBSUMED_BY` Constant denoting relationship between two types: A is subsumed by B
`static int` | `SUBSUMES` Constant denoting relationship between two types: A subsumes B

Constructor Summary
`TypeHierarchy(Configuration config)` Create the type hierarchy cache for a configuration

Method Summary
`Configuration` | `getConfiguration()` Get the Saxon configuration to which this type hierarchy belongs
`boolean` | `isIdCode(int typeCode)` Test whether a type annotation code represents the type xs:ID or one of its subtypes
`boolean` | `isIdrefsCode(int typeCode)` Test whether a type annotation code represents the type xs:IDREF, xs:IDREFS or one of their subtypes
`boolean` | `isSubType(ItemType subtype, ItemType supertype)` Determine whether type A is type B or one of its subtypes, recursively
`int` | `relationship(ItemType t1, ItemType t2)` Determine the relationship of one item type to another.
`static int` | `schemaTypeRelationship(SchemaType s1, SchemaType s2)` Get the relationship of two schema types to each other

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

Field Detail

### SAME_TYPE

    public static final int SAME_TYPE

  Constant denoting relationship between two types: A is the same type as B

  See Also:
    Constant Field Values

### SUBSUMES

    public static final int SUBSUMES

  Constant denoting relationship between two types: A subsumes B

  See Also:
    Constant Field Values

### SUBSUMED_BY

    public static final int SUBSUMED_BY

  Constant denoting relationship between two types: A is subsumed by B

  See Also:
    Constant Field Values

### OVERLAPS

    public static final int OVERLAPS

  Constant denoting relationship between two types: A overlaps B

  See Also:
    Constant Field Values

### DISJOINT

    public static final int DISJOINT

  Constant denoting relationship between two types: A is disjoint from B

  See Also:
    Constant Field Values

Constructor Detail

### TypeHierarchy

    public TypeHierarchy(Configuration config)

  Create the type hierarchy cache for a configuration

  Parameters:
    `config` - the configuration

Method Detail

### getConfiguration

    public Configuration getConfiguration()

  Get the Saxon configuration to which this type hierarchy belongs

  Returns:
    the configuration

### isSubType

    public boolean isSubType(ItemType subtype,
                             ItemType supertype)

  Determine whether type A is type B or one of its subtypes, recursively

  Parameters:
    `subtype` - identifies the first type
    `supertype` - identifies the second type
  Returns:
    true if the first type is the second type or a (direct or indirect) subtype of the second type

### relationship

    public int relationship(ItemType t1,
                            ItemType t2)

  Determine the relationship of one item type to another.

  Parameters:
    `t1` - the first item type
    `t2` - the second item type
  Returns:
    `SAME_TYPE` if the types are the same; `SUBSUMES` if the first type subsumes the second (that is, all instances of the second type are also instances of the first); `SUBSUMED_BY` if the second type subsumes the first; `OVERLAPS` if the two types overlap (have a non-empty intersection, but neither subsumes the other); `DISJOINT` if the two types are disjoint (have an empty intersection)

### isIdCode

    public boolean isIdCode(int typeCode)

  Test whether a type annotation code represents the type xs:ID or one of its subtypes

  Parameters:
    `typeCode` - the type annotation to be tested
  Returns:
    true if the type annotation represents an xs:ID

### isIdrefsCode

    public boolean isIdrefsCode(int typeCode)

  Test whether a type annotation code represents the type xs:IDREF, xs:IDREFS or one of their subtypes

  Parameters:
    `typeCode` - the type annotation to be tested
  Returns:
    true if the type annotation represents an xs:IDREF or xs:IDREFS or a subtype thereof

### schemaTypeRelationship

    public static int schemaTypeRelationship(SchemaType s1,
                                             SchemaType s2)

  Get the relationship of two schema types to each other

  Parameters:
    `s1` - the first type
    `s2` - the second type
  Returns:
    the relationship of the two types, as one of the constants `SAME_TYPE`, `SUBSUMES`, `SUBSUMED_BY`, `DISJOINT`

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Copyright (c) Saxonica Limited. All rights reserved.