Examples of java.util.Enumeration

java.util.Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to the nextElement method return successive elements of the series.
For example, to print all elements of a Vector<E> v:
```
 for (Enumeration<E> e = v.elements(); e.hasMoreElements();) System.out.println(e.nextElement());
```
Methods are provided to enumerate through the elements of a vector, the keys of a hashtable, and the values in a hashtable. Enumerations are also used to specify the input streams to a SequenceInputStream.
NOTE: The functionality of this interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration. @see java.util.Iterator @see java.io.SequenceInputStream @see java.util.Enumeration#nextElement() @see java.util.Hashtable @see java.util.Hashtable#elements() @see java.util.Hashtable#keys() @see java.util.Vector @see java.util.Vector#elements() @author Lee Boynton @version 1.24, 11/17/05 @since JDK1.0

   */
  protected void denyRequest(AgentId from, DenyRequest not) {
    if (logger.isLoggable(BasicLevel.DEBUG))
      logger.log(BasicLevel.DEBUG, "Queue.DenyRequest(" + from + ',' + not + ')');


    Enumeration ids = not.getIds();


    String msgId;
    Message message;
    AgentId consId;
    int consCtx;
    DMQManager dmqManager = null;


    if (! ids.hasMoreElements()) {
      // If the deny request is empty, the denying is a contextual one: it
      // requests the denying of all the messages consumed by the denier in
      // the denying context:
      for (Iterator entries = deliveredMsgs.entrySet().iterator(); entries.hasNext();) {
        // Browsing the delivered messages:
        Map.Entry entry = (Map.Entry) entries.next();


        msgId = (String) entry.getKey();
        message = (Message) entry.getValue();


        consId = (AgentId) consumers.get(msgId);
        consCtx = ((Integer) contexts.get(msgId)).intValue();


        if (logger.isLoggable(BasicLevel.DEBUG))
          logger.log(BasicLevel.DEBUG, " -> deny msg " + msgId + "(consId = " + consId + ')');


        // If the current message has been consumed by the denier in the same
        // context: denying it.
        if (consId.equals(from) && consCtx == not.getClientContext()) {
          // state change, so save.
          setSave();
          consumers.remove(msgId);
          contexts.remove(msgId);
          entries.remove();
          message.setRedelivered();


          // If message considered as undeliverable, adding
          // it to the list of dead messages:
          if (isUndeliverable(message)) {
            message.delete();
            if (dmqManager == null)
              dmqManager = new DMQManager(dmqId, getId());
            nbMsgsSentToDMQSinceCreation++;
            dmqManager.addDeadMessage(message.getFullMessage(), MessageErrorConstants.UNDELIVERABLE);
          } else {
            // Else, putting the message back into the deliverables list:
            storeMessageHeader(message);
          }


          if (logger.isLoggable(BasicLevel.DEBUG))
            logger.log(BasicLevel.DEBUG, "Message " + msgId + " denied.");
        }
      }
    }


    // For a non empty request, browsing the denied messages:
    for (ids = not.getIds(); ids.hasMoreElements();) {
      msgId = (String) ids.nextElement();
      message = (Message) deliveredMsgs.remove(msgId);


      // Message may have already been denied. For example, a proxy may deny
      // a message twice, first when detecting a connection failure - and
      // in that case it sends a contextual denying -, then when receiving

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        }
        writer.writeEndElement();
    }


    private void addNamespaceDeclarations(Properties namespaces) throws XMLStreamException{
        Enumeration e = namespaces.propertyNames();
        while (e.hasMoreElements()){
            String prefix = (String)e.nextElement();
            String uri = namespaces.getProperty(prefix);
            writer.writeStartElement(MappingNodeConstants.Tags.NAMESPACE_DECLARATION);
            if (!prefix.equals(MappingNodeConstants.DEFAULT_NAMESPACE_PREFIX)){
              writeElement(MappingNodeConstants.Tags.NAMESPACE_DECLARATION_PREFIX, prefix);
            }

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  protected static ResourceXmlBean getResource(String id) {
    return (ResourceXmlBean) roots.get(id);
  }


  protected static Vector getItems() {
    Enumeration elts = roots.elements();
    Vector retour = new Vector();
    while (elts.hasMoreElements()) {
      retour.add(elts.nextElement());
    }
    return retour;
  }

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    }
    
    public int hashCode() {
        int code = Integer.MAX_VALUE/45; // "random" value for empty lists
        String paramName = null;
        Enumeration enm = this.getNames();


        while (enm.hasMoreElements()) {
            paramName = (String)enm.nextElement();
            code += paramName.hashCode();
            code += this.get(paramName).hashCode();
        }


        return code;

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    public String toString() {
        StringBuffer buffer = new StringBuffer();
        buffer.ensureCapacity(parameters.size() * 16);    //    heuristic: 8 characters per field
        
        Enumeration keys = parameters.keys();
        while(keys.hasMoreElements())
        {
            buffer.append("; ");
            
            String key = (String)keys.nextElement();
            buffer.append(key);
            buffer.append('=');
               buffer.append(quote((String)parameters.get(key)));
        }

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  protected static ResourceXmlBean getResource(String id) {
    return (ResourceXmlBean) roots.get(id);
  }


  protected static Vector getItems() {
    Enumeration elts = roots.elements();
    Vector retour = new Vector();
    while (elts.hasMoreElements()) {
      retour.add(elts.nextElement());
    }
    return retour;
  }

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  static void extract(final File sourceZipFile, File unzipDestinationDirectory) throws IOException {
    // Open Zip file for reading
    ZipFile zipFile = new ZipFile(sourceZipFile, ZipFile.OPEN_READ);


    // Create an enumeration of the entries in the zip file
    Enumeration zipFileEntries = zipFile.entries();


    // Process each entry
    while (zipFileEntries.hasMoreElements()) {
      // grab a zip file entry
      ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();


      String currentEntry = entry.getName();


      File destFile = new File(unzipDestinationDirectory, currentEntry);

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    if ((m_BaseClassifier != null) && 
  (m_BaseClassifier instanceof OptionHandler)) {
      newVector.addElement(new Option("", "", 0, "\nOptions specific to scheme " 
              + m_BaseClassifier.getClass().getName() 
              + ":"));
      Enumeration enu = ((OptionHandler)m_BaseClassifier).listOptions();


      while (enu.hasMoreElements()) {
        newVector.addElement(enu.nextElement());
      }
    }


    return  newVector.elements();
  }

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  /**
   * registers all the editors in Weka.
   */
  public static void registerEditors() {
    Properties     props;
    Enumeration   enm;
    String     name;
    String     value;
    Class     baseCls;
    Class    cls;


    if (m_EditorsRegistered)
      return;
    
    System.err.println("---Registering Weka Editors---");
    m_EditorsRegistered = true;


    // load properties
    try {
      props = Utils.readProperties(GUIEDITORS_PROPERTY_FILE);
    }
    catch (Exception e) {
      props = new Properties();
      e.printStackTrace();
    }
    
    enm = props.propertyNames();
    while (enm.hasMoreElements()) {
      name  = enm.nextElement().toString();
      value = props.getProperty(name, "");
      
      registerEditor(name, value);
    }
  }

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   * the hashtable (with the root element as key)
   */
  public static Hashtable sortClassesByRoot(String classes) {
    Hashtable                 roots;
    Hashtable                 result;
    Enumeration               enm;
    int                       i;
    StringTokenizer           tok;
    String                    clsname;
    Vector                    list;
    HierarchyPropertyParser   hpp;
    String                    separator;
    String                    root;
    String                    tmpStr;
    
    if (classes == null)
      return null;
    
    roots     = new Hashtable();
    hpp       = new HierarchyPropertyParser();
    separator = hpp.getSeperator();
    
    // go over all classnames and store them in the hashtable, with the
    // root element as the key
    tok   = new StringTokenizer(classes, ", ");
    while (tok.hasMoreElements()) {
      clsname = tok.nextToken();
      root    = getRootFromClass(clsname, separator);
      if (root == null)
        continue;
      
      // already stored?
      if (!roots.containsKey(root)) {
        list = new Vector();
        roots.put(root, list);
      }
      else {
        list = (Vector) roots.get(root);
      }
      
      list.add(clsname);
    }
    
    // build result
    result = new Hashtable();
    enm    = roots.keys();
    while (enm.hasMoreElements()) {
      root = (String) enm.nextElement();
      list = (Vector) roots.get(root);
      tmpStr = "";
      for (i = 0; i < list.size(); i++) {
        if (i > 0)
          tmpStr += ",";

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