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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.

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/*
 * Copyright (c) 2002-2006 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork2;

import com.opensymphony.xwork2.config.entities.ActionConfig;

import java.util.List;

/**
 * An unknown handler manager contains a list of UnknownHandler and iterates on them by order
 *
 * @see com.opensymphony.xwork2.DefaultUnknownHandlerManager
 */
public interface UnknownHandlerManager {
    Result handleUnknownResult(ActionContext actionContext, String actionName, ActionConfig actionConfig, String resultCode);

    Object handleUnknownMethod(Object action, String methodName) throws NoSuchMethodException;

    ActionConfig handleUnknownAction(String namespace, String actionName);

    boolean hasUnknownHandlers();

    List getUnknownHandlers();
}