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package com.sun.xml.internal.xsom;

import java.util.List;

Identity constraint.
Author:
Kohsuke Kawaguchi/**
 * Identity constraint.
 *
 * @author Kohsuke Kawaguchi
 */
public interface XSIdentityConstraint extends XSComponent {

    
Gets the XSElementDecl that owns this identity constraint. 
Returns:

     never null./**
     * Gets the {@link XSElementDecl} that owns this identity constraint.
     *
     * @return
     *      never null.
     */
    XSElementDecl getParent();

    
Name of the identity constraint. A name uniquely identifies this XSIdentityConstraint within the namespace. 
Returns:

     never null./**
     * Name of the identity constraint.
     *
     * A name uniquely identifies this {@link XSIdentityConstraint} within
     * the namespace.
     *
     * @return
     *      never null.
     */
    String getName();

    
Target namespace of the identity constraint.
Just short for getParent().getTargetNamespace().
/**
     * Target namespace of the identity constraint.
     *
     * Just short for <code>getParent().getTargetNamespace()</code>.
     */
    String getTargetNamespace();

    
Returns the type of the identity constraint.
Returns:
 either KEY,KEYREF, or UNIQUE./**
     * Returns the type of the identity constraint.
     *
     * @return
     *      either {@link #KEY},{@link #KEYREF}, or {@link #UNIQUE}.
     */
    short getCategory();

    final short KEY = 0;
    final short KEYREF = 1;
    final short UNIQUE = 2;

    
Returns the selector XPath expression as string.
Returns:

     never null./**
     * Returns the selector XPath expression as string.
     *
     * @return
     *      never null.
     */
    XSXPath getSelector();

    
Returns the list of field XPaths.
Returns:
 a non-empty read-only list of Strings, each representing the XPath./**
     * Returns the list of field XPaths.
     *
     * @return
     *      a non-empty read-only list of {@link String}s,
     *      each representing the XPath.
     */
    List<XSXPath> getFields();

    
If this is KEYREF, returns the key XSIdentityConstraint being referenced. 
Throws:
IllegalStateException –  if getCategory()!=KEYREF
Returns:
 always non-null (when getCategory()==KEYREF)./**
     * If this is {@link #KEYREF}, returns the key {@link XSIdentityConstraint}
     * being referenced.
     *
     * @return
     *      always non-null (when {@link #getCategory()}=={@link #KEYREF}).
     * @throws IllegalStateException
     *      if {@link #getCategory()}!={@link #KEYREF}
     */
    XSIdentityConstraint getReferencedKey();
}