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这是一个用java和xml编写的流媒体服务器管理软件

    }
    catch (ClassCastException e)
    {
      System.out.println("attempted to insert DataFragment in non-Element path: "
                         + grandparentNode.getNodeType() + " / "
                         + parentNode.getNodeType());
      e.printStackTrace();

    }

    localBuildDocumentFragment(type, parentElement, grandparentElement);
  }

  
  /**
   * This constructor is used from the GUI to create a DataFragment
   * in sync with the ConfigTree.
   */
  public AccDataFragment(int type, AccreditConfigTree tree, DefaultMutableTreeNode node)
  {
    super();

    accreditconfigTree = tree;
    parentTreeNode = node;
    parentNode = accreditconfigTree.getNode(parentTreeNode);
    grandparentNode = parentNode.getParentNode();

    Element parentElement = null;
    Element grandparentElement = null;

    try
    {
      parentElement = (Element) parentNode;
      grandparentElement = (Element) grandparentNode;
    }
    catch (ClassCastException e)
    {
      System.out.println("attempted to insert DataFragment in non-Element path: "
                         + grandparentNode.getNodeType() + " / "
                         + parentNode.getNodeType());
      e.printStackTrace();

    }

    localBuildDocumentFragment(type, parentElement, grandparentElement);
  }
  /**
   * This constructor is a last-minute add-on to support inserting
   * nodes that are not in sync with the ConfigTree. It is used for
   * processing the Deployment script.
   * The main difference is that there is no more reliance on
   * selection in the ConfigTree. Instead the constructor must
   * be pased the org.w3c.Node that is the parent of the one being built.
   */
  public AccDataFragment(int type, Node aParentNode)
  {
    super();

    parentNode = aParentNode;
    grandparentNode = parentNode.getParentNode();

    Element parentElement = null;
    Element grandparentElement = null;

    try
    {
      parentElement = (Element) parentNode;
      grandparentElement = (Element) grandparentNode;
    }
    catch (ClassCastException e)
    {
      System.out.println("attempted to insert DataFragment in non-Element path: "
                         + grandparentNode.getNodeType() + " / "
                         + parentNode.getNodeType());
      e.printStackTrace();

    }

    localBuildDocumentFragment(type, parentElement, grandparentElement);

  }

  /**
   *
   * @param type
   * @param parent
   * @param grandparent
   */
  protected void localBuildDocumentFragment(int type, Element parent,
          Element grandparent)
  {
    Document doc = parent.getOwnerDocument();    
    switch (type)
    {

      case FEATURE_SERVER:
      {
        fragment = buildDocumentFragment(doc, FEATURE_SERVER_STRING);

        getElement("type").setAttribute("value",
                   grandparent.getAttribute("value"));
        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", FEATURE_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }

      case MARSHAL_SERVER:
      {
        fragment = buildDocumentFragment(doc, MARSHAL_SERVER_STRING);

        getElement("type").setAttribute("value",
                   grandparent.getAttribute("value"));
        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", MARSHAL_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }

      case CDR_SERVER:
      {
        fragment = buildDocumentFragment(doc, CDR_SERVER_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", CDR_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }

      case HEARTBEAT_SERVER:
      {
        fragment = buildDocumentFragment(doc, HEARTBEAT_SERVER_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", HEARTBEAT_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }

      case REDIRECT_SERVER:
      {
        fragment = buildDocumentFragment(doc, REDIRECT_SERVER_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", REDIRECT_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }

      case PDP_SERVER:
      {
        fragment = buildDocumentFragment(doc, PDP_SERVER_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", POLICY_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }
      /*
      case DVR_CLIENT:
      {
        fragment = buildDocumentFragment(doc, DVR_CLIENT_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", DVR_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }

      case ENV_CLIENT:
      {
        fragment = buildDocumentFragment(doc, ENV_CLIENT_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", ENV_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }
      */
      case DVR:
      {
        fragment = buildDocumentFragment(doc, DVR_CLIENT_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", DVR_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }
      case ENV:
      {
        fragment = buildDocumentFragment(doc, ENV_CLIENT_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", ENV_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }
      case ACCDVR:
      {
        fragment = buildDocumentFragment(doc, ACCDVR_CLIENT_STRING);

        getElement("group").setAttribute("value",
                   parent.getAttribute("value"));

        Element rootElement = getRootElement();

        rootElement.setAttribute("fileDir", DVR_DIR);
        rootElement.setAttribute("fileType", Integer.toString(type));

        break;
      }
      case FEATURE_GROUP:

      case MARSHAL_GROUP:
      {
        fragment = buildDocumentFragment(doc, GROUP_STRING);

        break;
      }

      default:
      {
        System.out.println("cannot build new node of type "
                           + TreeNodeTypes.strings[type] + " ("
                           + Integer.toString(type) + ")");
        new Exception().printStackTrace();

      }
    }
  }


  // public methods

  // methods from HostPortData

  /**
   *
   */
  public String getHostData() throws InvalidRequestException
  {
    checkValidity("getHostData");

    Element rootElement = getRootElement();

    if (rootElement == null)
    {
      System.out.println("Error in getHostData: root element is null");

      return "";
    }

    return rootElement.getAttribute("host");
  }

  /**
   *
   * @param value
   *
   * @throws InvalidRequestException
   */
  public void setHostData(String value) throws InvalidRequestException
  {
    checkValidity("setHostData");

    if (configTree != null)
    {
      Element duplicate = configTree.hostPortExists(value, getPortData());
      if (duplicate != null)
      {
        JOptionPane.showMessageDialog(new JFrame(),
        value + ":" + getPortData() + " already exists", "Duplicate host:port",
        JOptionPane.ERROR_MESSAGE);
        throw new InvalidRequestException(value + ":" + getPortData()
        + " already exists in " + duplicate);
      }
    }
    getRootElement().setAttribute("host", value);
  }

  /**
   *
   */
  public String getPortData() throws InvalidRequestException
  {
    checkValidity("getPortData");
    return getRootElement().getAttribute("port");
  }

  /**
   *
   */
  public void setPortData(String value) throws InvalidRequestException
  {
    checkValidity("setPortData");

    if (configTree != null)
    {
      Element duplicate = configTree.hostPortExists(getHostData(), value);
      if (duplicate != null)
      {
        JOptionPane.showMessageDialog(new JFrame(),
        getHostData() + ":" + value + " already exists", "Duplicate host:port",
        JOptionPane.ERROR_MESSAGE);
        throw new InvalidRequestException(getHostData() + ":" + value
        + " already exists in " + duplicate);
      }
    }
    getRootElement().setAttribute("port", value);
  }
/*
  public String getHostNameData() throws InvalidRequestException
  {
    checkValidity("getHostNameData");

    Element rootElement = getRootElement();