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

/*
 * The Apache Software License, Version 1.1
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 * Copyright (c) 2001 The Apache Software Foundation.  
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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
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package org.apache.xerces.impl.xs.identity;

import org.xml.sax.SAXException;

/**
 * Interface for a field activator. The field activator is responsible
 * for activating fields within a specific scope; the caller merely
 * requests the fields to be activated.
 *
 * @author Andy Clark, IBM
 *
 * @version $Id$
 */
public interface FieldActivator {
    
    //
    // FieldActivator methods
    //

    /**
     * Start the value scope for the specified identity constraint. This 
     * method is called when the selector matches in order to initialize 
     * the value store.
     *
     * @param identityConstraint The identity constraint.
     */
    public void startValueScopeFor(IdentityConstraint identityConstraint);

    /** 
     * Request to activate the specified field. This method returns the
     * matcher for the field.
     * It's also important for the implementor to ensure that the Field realizes that
     * it is permitted to match a value--that is, to call the field's setMayMatch(boolean) method.
     *
     * @param field The field to activate.
     */
    public XPathMatcher activateField(Field field);

    /**
     * Ends the value scope for the specified identity constraint.
     *
     * @param identityConstraint The identity constraint.
     */
    public void endValueScopeFor(IdentityConstraint identityConstraint);

} // interface FieldActivator