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## com.saxonica.schema
Class IdentityConstraint

    java.lang.Object
      com.saxonica.schema.SchemaStructure
          com.saxonica.schema.IdentityConstraint

All Implemented Interfaces:
  SchemaComponent, java.io.Serializable, javax.xml.transform.SourceLocator, UserSchemaComponent

Direct Known Subclasses:
  Key, KeyRef, Unique

public abstract class IdentityConstraint
extends SchemaStructure
implements UserSchemaComponent

The base class for the XML Schema Identity Constraints (key, keyref, unique).

See Also:
  Serialized Form

Field Summary

Fields inherited from interface net.sf.saxon.type.SchemaComponent
`FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING`

Constructor Summary
`protected` | `IdentityConstraint(java.lang.String name)` Constructor used by sub-classes.

Method Summary
`void` | `addField(IdentityField field)` Adds the given IdentityField to this IdentityConstraint
`boolean` | `fixup(PreparedSchema schema)` Check references from this component to other components
`java.util.List` | `getFields()` Returns the List of Fields contained within this IdentityConstraint.
`int` | `getFingerprint()` Get the fingerprint of the name of this identity constraint
`java.lang.String` | `getName()` Returns the name of this IdentityConstraint.
`IdentitySelector` | `getSelector()` Returns the selector of this IdentityConstraint.
`java.util.Iterator` | `iterateFields()` Iterate over the fields contained within this IdentityConstraint.
`void` | `setFingerprint(int fp)` Set the fingerprint of the name of this identity constraint
`void` | `setName(java.lang.String name)` Sets the name for this IdentityConstraint.
`void` | `setSelector(IdentitySelector selector)` Sets the selector for this IdentityConstraint.
`boolean` | `validate(PreparedSchema schema)` Checks the validity of this Schema defintion.

Methods inherited from class com.saxonica.schema.SchemaStructure
`getColumnNumber, getFixupStatus, getLineNumber, getPublicId, getSchema, getSystemId, getValidationStatus, lookForCycles, setFixupStatus, setLineNumber, setLocator, setSchema, setSystemId, setValidationStatus`

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

Methods inherited from interface com.saxonica.schema.UserSchemaComponent
`lookForCycles`

Methods inherited from interface net.sf.saxon.type.SchemaComponent
`getValidationStatus`

Constructor Detail

### IdentityConstraint

    protected IdentityConstraint(java.lang.String name)
                          throws SchemaException

  Constructor used by sub-classes. Creates a new IdentityConstraint.

Parameters:
  `name` - the name for the IdentityConstraint. Must not be null.

Method Detail

### addField

    public void addField(IdentityField field)

  Adds the given IdentityField to this IdentityConstraint

  Parameters:
    `field` - the IdentityField to add.

### iterateFields

    public java.util.Iterator iterateFields()

  Iterate over the fields contained within this IdentityConstraint.

  Returns:
    an Iterator over the Field objects contained within this IdentityConstraint.

### getFields

    public java.util.List getFields()

  Returns the List of Fields contained within this IdentityConstraint.

  Returns:
    the List of fields

### getName

    public java.lang.String getName()

  Returns the name of this IdentityConstraint. This value will never be null.

  Returns:
    the name of this IdentityConstraint

### getSelector

    public IdentitySelector getSelector()

  Returns the selector of this IdentityConstraint.

  Returns:
    the IdentitySelector of this IdentityConstraint

### setName

    public void setName(java.lang.String name)
                 throws SchemaException

  Sets the name for this IdentityConstraint.

  Parameters:
    `name` - the name for this IdentityConstraint. Must not be null.
  Throws:
    `SchemaException` - if name is null.

### setSelector

    public void setSelector(IdentitySelector selector)
                     throws SchemaException

  Sets the selector for this IdentityConstraint.

  Parameters:
    `selector` - the Selector for this IdentityConstraint. Must not be null.
  Throws:
    `SchemaException` - if selector is null.

### setFingerprint

    public void setFingerprint(int fp)

  Set the fingerprint of the name of this identity constraint

### getFingerprint

    public int getFingerprint()

  Get the fingerprint of the name of this identity constraint

### fixup

    public boolean fixup(PreparedSchema schema)
                  throws SchemaException

  Check references from this component to other components

  Specified by:
    `fixup` in interface `UserSchemaComponent`
  Parameters:
    `schema` - The schema is used for reporting errors
  Returns:
    true if all is well, false if errors found
  Throws:
    `SchemaException`

### validate

    public boolean validate(PreparedSchema schema)
                     throws SchemaException

  Checks the validity of this Schema defintion.

  Specified by:
    `validate` in interface `UserSchemaComponent`
  Parameters:
    `schema` - if this is not null, any errors that are detected should be reported using the error() method of this schema.
  Returns:
    true when this Schema definition is valid, otherwise false.
  Throws:
    `SchemaException`

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