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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
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package com.sun.enterprise.deployment.node;

import java.util.Map;

/**
 * This interface defines the processing used to upgrade an older
 * configuration file to the latest version.
 *
 * The class should be initialized by the init method, which should
 * initialize the map returned by getMatchXPath with the keys to
 * look for in the input configuration file and with values set to null.
 * For REMOVE_ELEMENT, the map would usually contain one item.
 * For REPLACE_ELEMENT, the map could contain more that one item.
 * For REPLACE_ELEMENT, when all elements in the map have been matched, the
 * isValid method is called.  If it returns true, the
 * getReplacementElementName and getReplacementElementValue methods
 * are called and should return the replacement element name and value.
 * if the input matched items are valid.  Otherwise, these methods should
 * return null.
 * @author  Gerald Ingalls
 * @version 
 */
public interface VersionUpgrade {
  public enum UpgradeType {
    REMOVE_ELEMENT,
    REPLACE_ELEMENT
  }

  /**
   * Return the kind of processing to do
   * @return the kind of processing to do
   */
  public UpgradeType getUpgradeType();

  /**
   * Initialize
   */
  public void init();

  /**
   * Return the map of xml element to match
   * @return the map of xml element to match
   */
  public Map getMatchXPath();

  /**
   * Return the replacement element name
   * @return the replacement element name
   */
  public String getReplacementElementName();

  /**
   * Return the replacement element value
   * @return the replacement element value
   */
  public String getReplacementElementValue();

  /**
   * Return whether the matched items are valid.
   * @return whether the matched items are valid.
   */
  public boolean isValid();
}