src/org/apache/xerces/impl/xs/identity/ValueStore.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *        Apache Software Foundation (http://www.apache.org/)."
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
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package org.apache.xerces.impl.xs.identity;

import org.xml.sax.SAXException;

/**
 * Interface for storing values associated to an identity constraint. 
 * Each value stored corresponds to a field declared for the identity
 * constraint. One instance of an object implementing this interface
 * is created for each identity constraint per element declaration in
 * the instance document to store the information for this identity
 * constraint.
 * <p>
 * <strong>Note:</strong> The component performing identity constraint
 * collection and validation is responsible for providing an 
 * implementation of this interface. The component is also responsible
 * for performing the necessary checks required by each type of identity
 * constraint.
 *
 * @author Andy Clark, IBM
 *
 * @version $Id$
 */
public interface ValueStore {
    
    //
    // ValueStore methods
    //

    /** 
     * Adds the specified value to the value store.
     *
     * @param value The value to add.
     * @param field The field associated to the value. This reference
     *              is used to ensure that each field only adds a value
     *              once within a selection scope.
     */
    public void addValue(Field field, IDValue value);

    /* report an error if a nillable element is being keyed on.
     * the implementor must check that a <key> really is present, not a <unique> or <keyref>.
     * @param:  id:  the IdentityConstraint that has matched.
     */
    public void reportNilError(IdentityConstraint id);

} // interface ValueStore