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OSWorkflow » com » opensymphony » workflow » util » Validatable.java
/*
 * Copyright (c) 2002-2003 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.workflow.util;

import com.opensymphony.workflow.InvalidWorkflowDescriptorException;


/**
 * Abstact base class for elements that can be validated.
 *
 * @author <a href="mailto:vorburger@users.sourceforge.net">Michael Vorburger</a>
 * @version $Revision: 1.2 $
 */
public interface Validatable {
    //~ Methods ////////////////////////////////////////////////////////////////

    /**
     * Validate this element, and propagate validation to all contained sub-elements.
     * Should throw an InvalidWorkflowDescriptorException with details in message if the element
     * is invalid. Validity checks should be checks that cannot be encapsulated in the DTD.
     *
     * Validation has to be called explicitly on writting, a writeXML() does not validate implicitly;
     * it *IS* thus possible to write invalid descriptor files.  This could be useful for e.g.
     * a graphical workflow definition editor which would like to write incomplete definitions.
     * Validation *IS* performed on loading a workflow definition.
     *
     * @see  com.opensymphony.workflow.loader.WorkflowLoader#load
     * @throws InvalidWorkflowDescriptorException
     */
    public void validate() throws InvalidWorkflowDescriptorException;
}
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