Examples of java.util.HashMap

java.util.HashMap
Hash table based implementation of the Map interface. This implementation provides all of the optional map operations, and permits null values and the null key. (The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls.) This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time.
This implementation provides constant-time performance for the basic operations (get and put), assuming the hash function disperses the elements properly among the buckets. Iteration over collection views requires time proportional to the "capacity" of the HashMap instance (the number of buckets) plus its size (the number of key-value mappings). Thus, it's very important not to set the initial capacity too high (or the load factor too low) if iteration performance is important.
An instance of HashMap has two parameters that affect its performance: initial capacity and load factor. The capacity is the number of buckets in the hash table, and the initial capacity is simply the capacity at the time the hash table is created. The load factor is a measure of how full the hash table is allowed to get before its capacity is automatically increased. When the number of entries in the hash table exceeds the product of the load factor and the current capacity, the hash table is rehashed (that is, internal data structures are rebuilt) so that the hash table has approximately twice the number of buckets.
As a general rule, the default load factor (.75) offers a good tradeoff between time and space costs. Higher values decrease the space overhead but increase the lookup cost (reflected in most of the operations of the HashMap class, including get and put). The expected number of entries in the map and its load factor should be taken into account when setting its initial capacity, so as to minimize the number of rehash operations. If the initial capacity is greater than the maximum number of entries divided by the load factor, no rehash operations will ever occur.
If many mappings are to be stored in a HashMap instance, creating it with a sufficiently large capacity will allow the mappings to be stored more efficiently than letting it perform automatic rehashing as needed to grow the table.
Note that this implementation is not synchronized. If multiple threads access a hash map concurrently, and at least one of the threads modifies the map structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more mappings; merely changing the value associated with a key that an instance already contains is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the map. If no such object exists, the map should be "wrapped" using the {@link Collections#synchronizedMap Collections.synchronizedMap}method. This is best done at creation time, to prevent accidental unsynchronized access to the map:
```
 Map m = Collections.synchronizedMap(new HashMap(...));
```
The iterators returned by all of this class's "collection view methods" are fail-fast: if the map is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove method, the iterator will throw a {@link ConcurrentModificationException}. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.
This class is a member of the Java Collections Framework. @param < K> the type of keys maintained by this map @param < V> the type of mapped values @author Doug Lea @author Josh Bloch @author Arthur van Hoff @author Neal Gafter @version 1.73, 03/13/07 @see Object#hashCode() @see Collection @see Map @see TreeMap @see Hashtable @since 1.2

   * @param xml String QB XML.
   * @return HashMap {modulename,qbxmlname,listvo}
   */
  public HashMap getVOListFromQBXML(String xml, String path)
  {
    HashMap listVOAndModuleName = new HashMap();


    try
    {
      filePath = path;
      ArrayList objectsCV = new ArrayList();
      Document qbXML = getDocumentFromString(xml);
      String nameQBXML = getQBXMLName(qbXML);
      Node node = qbXML.getElementsByTagName(nameQBXML).item(0);


      Document configForQBXML = getDocumentFromString(getDocumentFromString(FILE_CONFIG).getElementsByTagName(nameQBXML).item(0).toString());


      listVOAndModuleName = new HashMap();
      NodeList listQB = qbXML.getElementsByTagName(getValueOfNodeByTagName(configForQBXML, TAG_SEPARATOR) + "Ret");
      Node config = configForQBXML.getFirstChild();


      String moduleName = getValueOfNodeByTagName(config, TAG_MODULE_NAME);
      String className = getValueOfNodeByTagName(config, TAG_VONAME);


      Object cvObj = null;


      int length = listQB.getLength();
      if (node.getAttributes().getNamedItem(ATTR_STATUS_CODE).getNodeValue().equals("0"))
      {
        for (int i = 0; i < length; i++)
        {
          cvObj = getVOfromQBXML(listQB.item(i), config);
          setCVID(cvObj, moduleName, className);
          objectsCV.add(cvObj);
        }
      } else
      {
        System.out.println("*** Message from QB:  " + node.getAttributes().getNamedItem(ATTR_STATUS_MESSAGE).getNodeValue());
      }
      listVOAndModuleName.put("qbxmlname", nameQBXML);
      listVOAndModuleName.put(ATTR_LISTVO, objectsCV);
      listVOAndModuleName.put(TAG_MODULE_NAME, moduleName);
    } catch (Exception e)
    {
      logger.error("[getVOListFromQBXML] Exception thrown.", e);
    }

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      DynaActionForm dynaForm = (DynaActionForm)form;
      EmailFacadeHome cfh = (EmailFacadeHome)CVUtility.getHomeObject("com.centraview.email.emailfacade.EmailFacadeHome", "EmailFacade");
      EmailFacade remote = (EmailFacade)cfh.create();
      remote.setDataSource(dataSource);


      HashMap hmFolder = new HashMap();
      String str = (String)dynaForm.get("accountid");
      String folderid = (String)dynaForm.get("folderid");
      String foldername = (String)dynaForm.get("foldername");
      String parentid = (String)dynaForm.get("parentid");


      hmFolder.put("AccountID", new Integer(Integer.parseInt(str)));
      hmFolder.put("parentid", new Integer(Integer.parseInt(parentid)));
      hmFolder.put("foldername", foldername);
      hmFolder.put("folderid", new Integer(Integer.parseInt(folderid)));


      int i = remote.editFolder(individualId, hmFolder);
      // TODO do something with this return value?
      dynaForm.initialize(mapping);
    }

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        // we need to generate a DisplayList object to pass
        // to the List View code (List.jsp)
        Iterator iter = sqlResults.iterator();


        while (iter.hasNext()) {
          HashMap sqlRow = (HashMap)iter.next();
          String indvName = (String)sqlRow.get("Name");
          int indvID = ((Number)sqlRow.get("IndividualID")).intValue();
          attendeeVec.addElement(new DDNameValue("" + indvID + "#" + indvName, indvName));
        }
      } else if (dbName != null && dbName.equals("individual")) {
        gal = AttendeeList.getAttendeeList(individualID, "individual", Integer.parseInt(dbID),
            dataSource);

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        String path = null;
        String file = null;
        try {


            // loop through all initialization parameter pairs
            HashMap map = new HashMap();
            Enumeration pnum = servlet.getInitParameterNames();
            ServletContext serv = servlet.getServletContext();
            while (pnum.hasMoreElements()) {


                // parameter name is path and value is service definition file
                path = (String) pnum.nextElement();
                file = "/WEB-INF/" + servlet.getInitParameter(path);
                InputStream is = null;
                try {
                    is = serv.getResourceAsStream(file);
                    if (is == null) {
                        logger.error("Service definition not found for service " + path + " at " + file);
                        throw new UnavailableException("Service definition not found for service " + path + " at "
                            + file + ". Check configuration of servlet " + servlet.getServletName()
                            + " in WEB-INF/web.xml.");
                    }
                    ServiceDefinition sdef = (ServiceDefinition) ctx.unmarshalDocument(is, null);
                    if (!path.startsWith("/")) {
                        path = "/" + path;
                    }
                    map.put(path, sdef);


                } finally {
                    if (is != null) {
                        try {
                            is.close();

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  private static Logger logger = Logger.getLogger(MarketingList.class);


  // constructor
  public  MarketingList()
  {
    columnMap = new HashMap();
    columnMap.put( "title" , new Integer(100) );
    columnMap.put( "description" , new Integer(120) );
    columnMap.put( "Records" , new Integer(120) ) ;
    columnMap.put( "Opportunities" , new Integer(100) );
    columnMap.put( "OpportunityValue" , new Float(120) );

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    HttpSession session = ((HttpServletRequest)(pageContext.getRequest())).getSession();


        ModuleFieldRightMatrix mfrmx = ((UserObject)session.getAttribute("userobject")).getUserPref().getModuleAuthorizationMatrix();
    HashMap hm = mfrmx.getFieldRights(getModulename());


    if (hm != null && hm.containsKey(getFieldname()))
    {
      fieldRight =  ((Integer)hm.get(getFieldname())).intValue();
    }




        // Acquire the select tag we are associated with
        CVSelectTag selectTag = (CVSelectTag) pageContext.getAttribute(Constants.SELECT_KEY);

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    // Check wheather the actionType is it Lookup or not
    String actionType = request.getParameter("actionType");


    GlobalMasterLists globalMasterLists = GlobalMasterLists.getGlobalMasterLists(dataSource);
    HashMap moduleList = new HashMap();
    if (globalMasterLists.get("moduleList") != null) {
      moduleList = (HashMap) globalMasterLists.get("moduleList");
    }


    ListPreference listPreference = userObject.getListPreference("File");
    ListView view = listPreference.getListView(String.valueOf(listPreference.getDefaultView()));


    ValueListParameters listParameters = null;
    ValueListParameters requestListParameters = (ValueListParameters) request.getAttribute("listParameters");
    if (requestListParameters == null) { // build up new Parameters
      listParameters = new ValueListParameters(ValueListConstants.FILE_LIST_TYPE, listPreference.getRecordsPerPage(), 1);
    } else { // paging or sorting or something, use the parameters from the
              // request.
      listParameters = requestListParameters;
    }
    if (listParameters.getSortColumn() == 0) {
      FieldDescriptor sortField = (FieldDescriptor) ValueListConstants.fileViewMap.get(listPreference.getSortElement());
      listParameters.setSortColumn(sortField.getQueryIndex());
      if (listPreference.getsortOrder())
        listParameters.setSortDirection("ASC");
      else
        listParameters.setSortDirection("DESC");
    }


    int defaultFolder = userObject.getUserPref().getDefaultFolderID();
    int folderID = defaultFolder;
    String param = request.getParameter("folderId");
    if (param != null) {
      if (param.indexOf("*") == -1) {
        folderID = Integer.parseInt(param);
      } else {
        folderID = Integer.parseInt(param.substring(0, param.indexOf("*")));
      }
    }
    listParameters.setFolderID(folderID);
    request.setAttribute("folderId", String.valueOf(folderID));


    String scope = request.getParameter(FileConstantKeys.TYPEOFFILELIST);
    if (scope != null && !scope.equals("")) {
      request.setAttribute("fileTypeRequest", scope);
      request.setAttribute(FileConstantKeys.TYPEOFFILELIST, scope);
    } else {
      scope = "MY";
      request.setAttribute("fileTypeRequest", "MY");
      request.setAttribute(FileConstantKeys.TYPEOFFILELIST, "MY");
    }


    // Search handling
    String filter = null;
    String filterParameter = request.getParameter("filter");
    if (filterParameter != null) {
      filter = (String) session.getAttribute("listFilter");
      if (scope.equals("MY")) {
        filter += " AND Owner = " + individualId;
        session.setAttribute("listFilter", filter);
      }
      request.setAttribute("appliedSearch", filterParameter);
    } else {
      // TODO Need to handle folder access too.
      if (scope.equals("MY"))
        filter = "SELECT FileID FROM cvfile WHERE Owner = " + individualId;
      session.removeAttribute("listFilter");
    }
    listParameters.setFilter(filter);


    // Build up the breadcrumbs on the folder bar.
    // the crumbs will be the complete FolderRootPath except in the
    // cases where you are looking at ALL, MY or PUBLIC then we will manually get rid of 
    // the leading things.
    try {
      Vector vec = null;
      int rootId = 0;
      ArrayList remove = new ArrayList();
      CvFileFacade fileFacade = new CvFileFacade();
      vec = fileFacade.getFolderRootPath(individualId, folderID, dataSource);
      if (vec != null) {
        Collections.reverse(vec);
        if (scope.equals("ALL")) {
          Iterator iter = vec.iterator();
          while (iter.hasNext()) {
            DDNameValue current = (DDNameValue) iter.next();
            if (current.getName().equals("CV_ROOT")) {
              remove.add(current);
            } else if (current.getName().equals("CVFS_ROOT")) {
              rootId = current.getId();
              remove.add(current);
            }
          }
          iter = remove.iterator();
          while (iter.hasNext()) {
            vec.remove(iter.next());
          }
          vec.add(0, new DDNameValue(rootId, "All Files"));
        } else if (scope.equals("MY")) {
          Iterator iter = vec.iterator();
          while (iter.hasNext()) {
            DDNameValue current = (DDNameValue) iter.next();
            if (current.getName().equals("CV_ROOT")) {
              remove.add(current);
            } else if (current.getName().equals("CVFS_ROOT")) {
              remove.add(current);
            } else if (current.getName().equals("CVFS_USER")) {
              remove.add(current);
            } else if (current.getName().equals(userObject.getLoginName())) {
              rootId = current.getId();
              remove.add(current);
            }
          }
          iter = remove.iterator();
          while (iter.hasNext()) {
            vec.remove(iter.next());
          }
          vec.add(0, new DDNameValue(rootId, "My Files"));
        } else if (scope.equals("PUBLIC")) {
          Iterator iter = vec.iterator();
          while (iter.hasNext()) {
            DDNameValue current = (DDNameValue) iter.next();
            if (current.getName().equals("CV_ROOT")) {
              remove.add(current);
            } else if (current.getName().equals("CVFS_ROOT")) {
              remove.add(current);
            } else if (current.getName().equals("Public Folders")) {
              rootId = current.getId();
              remove.add(current);
            }
          }
          iter = remove.iterator();
          while (iter.hasNext()) {
            vec.remove(iter.next());
          }
          vec.add(0, new DDNameValue(rootId, "Public Folders"));
        }
        request.setAttribute("breadCrumbs", vec);
      }
    } catch (Exception e) {
      logger.error("[execute]: Exception", e);
    }


    Vector viewColumns = view.getColumns();
    ArrayList columns = new ArrayList();
    // We the Action Type is Entity's Lookup then we must have
    // to set the columns which we are going to look
    if (actionType != null && actionType.equals("lookup")) {
      Vector lookupViewColumns = new Vector();
      lookupViewColumns.add("Name");
      ActionUtil.mapOldView(columns, lookupViewColumns, ValueListConstants.FILE_LIST_TYPE);
      listParameters.setRecordsPerPage(100);
      finalForward = ".view.files.filelookup";
    } else {
      ActionUtil.mapOldView(columns, viewColumns, ValueListConstants.FILE_LIST_TYPE);
    }
    listParameters.setColumns(columns);


    // Get the list!
    ValueListHome valueListHome = (ValueListHome) CVUtility.getHomeObject("com.centraview.valuelist.ValueListHome", "ValueList");
    ValueList valueList = null;
    try {
      valueList = valueListHome.create();
    } catch (CreateException e) {
      logger.error("[execute] Exception thrown.", e);
      throw new ServletException(e);
    }
    valueList.setDataSource(dataSource);
    ValueListVO listObject = valueList.getValueList(individualId, listParameters);
    ArrayList buttonList = new ArrayList();
    ValueListDisplay displayParameters = null;


    if (actionType != null && actionType.equals("lookup")) {
      // When we select the lookup then we should add the Select button to the
      // valueList
      buttonList.add(new Button("Select", "select", "lu_selectList('File');", false));
      displayParameters = new ValueListDisplay(buttonList, false, false);
      displayParameters.setRadio(true);
      listObject.setLookup(true);
      listObject.setLookupType(actionType);
      request.setAttribute("dynamicTitle", "File");
      request.setAttribute("lookupType", "File");
    } else {
      buttonList.add(new Button("View", "view", "vl_viewList();", false));
      buttonList.add(new Button("Delete", "delete", "vl_deleteList();", false));
      buttonList.add(new Button("Duplicate", "duplicate", "vl_duplicateList();", false));
      displayParameters = new ValueListDisplay(buttonList, true, true);
    }
    displayParameters.setSortable(true);
    displayParameters.setPagingBar(true);
    displayParameters.setLink(true);
    // Add the download file column
    displayParameters.setDownloadIcon(true);
    listObject.setDisplay(displayParameters);
    request.setAttribute("valueList", listObject);


    // For the searchBar
    String moduleID = (String) moduleList.get("File");
    request.setAttribute("moduleId", moduleID);
    request.setAttribute("listType", "File");


    return mapping.findForward(finalForward);
  }

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        count++;
      }


      // call ejb to insert record
      // initialize hashmap
      HashMap mapEvent = new HashMap();


      mapEvent.put("EventId", strEventid);
      mapEvent.put("Accepted", "NO");
      mapEvent.put("IndividualId", strIndividuals);


      // call to marketing facade
      MarketingFacadeHome mfh = (MarketingFacadeHome) 
        CVUtility.getHomeObject("com.centraview.marketing.marketingfacade.MarketingFacadeHome", "MarketingFacade");
      MarketingFacade remote = (MarketingFacade) mfh.create();

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    public int doStartTag() throws JspException 
  {
    HttpSession session = ((HttpServletRequest)(pageContext.getRequest())).getSession();
    
        ModuleFieldRightMatrix mfrmx = ((UserObject)session.getAttribute("userobject")).getUserPref().getModuleAuthorizationMatrix();
    HashMap hm = mfrmx.getFieldRights(getModulename());
    
    if (hm != null && hm.containsKey(getFieldname())) 
    {
      fieldRight =  ((Integer)hm.get(getFieldname())).intValue();
    } 
    
        // Create an appropriate "input" element based on our parameters
    
        StringBuffer results = new StringBuffer("<input type=\"");

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      ThreadList threadList = remote.getThreadList(individualId, tVO.getId());
      threadList = setLinksfunction(threadList);


      ListGenerator lg1 = ListGenerator.getListGenerator(dataSource);
      HashMap hmDispLists = lg1.getDisplayLists();


      if (hmDispLists != null) {
        hmDispLists.put(new Long(threadList.getListID()), threadList);
      }


      Vector timeSlipColumns = new Vector();


      timeSlipColumns.addElement("Description");

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