Examples of javax.faces.model.DataModel

javax.faces.model.DataModel

DataModel is an abstraction around arbitrary data binding technologies that can be used to adapt a variety of data sources for use by JavaServer Faces components that support per-row processing for their child components (such as {@link UIData}.

The data collection underlying a {@link DataModel} instance ismodeled as a collection of row objects that can be accessed by a zero-relative cursor (row index). The APIs provide mechanisms to position to a specified zero-relative row index, and to retrieve an object that represents the data that corresponds to the current row index.

A concrete {@link DataModel} instance is attached to a particularcollection of underlying data by calling the setWrappedData() method. It can be detached from that underlying data collection by passing a null parameter to this method.

Concrete {@link DataModel} implementations must provide a publiczero-arguments constructor that calls setWrappedData(null). A convenience constructor that takes a wrapped object of the appropriate type (and passes it on via a call to setWrappedData(), should also be provided.

Event listeners may be registered to receive notifications of when a new row index is selected.

    return null;
  }


  public void setColumnValue(String value)
  {
    DataModel countryDataModel = getCountryDataModel();
    if (countryDataModel.isRowAvailable())
    {
      SimpleCountry row = (SimpleCountry) countryDataModel.getRowData();
      DataModel columnDataModel = getColumnDataModel();
      if (columnDataModel.isRowAvailable())
      {
        Object column = columnDataModel.getRowData();
        Object key = new RowColumnKey(new Long(row.getId()), column);
        mValueMap.put(key, value);
      }
    }
  }

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                    saveDescendantComponentStates(getFacetsAndChildren()));
        }


        _colIndex = colIndex;


        DataModel dataModel = getDataModel();
        dataModel.setRowIndex(colIndex);


        String var = getVar();
        if (colIndex == -1)
        {
            if (var != null)
            {
                facesContext.getExternalContext().getRequestMap().remove(var);
            }
        }
        else
        {
            if (var != null)
            {
                if (isRowAvailable())
                {
                    Object rowData = dataModel.getRowData();
                    facesContext.getExternalContext().getRequestMap().put(var,
                            rowData);
                }
                else
                {

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    protected DataModel getDataModel()
    {
        String clientID = getParentUIData().getParent().getClientId(
                getFacesContext());
        DataModel dataModel = (DataModel) _dataModelMap.get(clientID);
        if (dataModel == null)
        {
            dataModel = createDataModel();
            _dataModelMap.put(clientID, dataModel);
        }

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                            false));
        }


        _rowIndex = rowIndex;


        DataModel dataModel = getDataModel();
        dataModel.setRowIndex(rowIndex);


        String var = getVar();
        if (rowIndex == -1)
        {
            if (var != null)
            {
                facesContext.getExternalContext().getRequestMap().remove(var);
            }
        }
        else
        {
            if (var != null)
            {
                if (isRowAvailable())
                {
                    Object rowData = dataModel.getRowData();
                    facesContext.getExternalContext().getRequestMap().put(var,
                            rowData);
                }
                else
                {

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        }
    }


    private DataModel getDataModel()
    {
        DataModel dataModel = null;
        String clientID = "";
        
        UIComponent parent = getParent();
        if (parent != null) {
            clientID = parent.getClientId(getFacesContext());

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            }
        }


        _rowIndex = rowIndex;


        DataModel dataModel = getDataModel();
        dataModel.setRowIndex(rowIndex);


        String var = (String) getStateHelper().get(PropertyKeys.var);
        if (rowIndex == -1)
        {
            if (var != null)
            {
                facesContext.getExternalContext().getRequestMap().remove(var);
            }
        }
        else
        {
            if (var != null)
            {
                if (isRowAvailable())
                {
                    Object rowData = dataModel.getRowData();
                    facesContext.getExternalContext().getRequestMap().put(var, rowData);
                }
                else
                {
                    facesContext.getExternalContext().getRequestMap().remove(var);

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            }
        }


        _rowIndex = rowIndex;


        DataModel dataModel = getDataModel();
        dataModel.setRowIndex(rowIndex);


        String var = (String) getStateHelper().get(PropertyKeys.var);
        if (rowIndex == -1)
        {
            if (var != null)
            {
                facesContext.getExternalContext().getRequestMap().remove(var);
            }
        }
        else
        {
            if (var != null)
            {
                if (isRowAvailable())
                {
                    Object rowData = dataModel.getRowData();
                    facesContext.getExternalContext().getRequestMap().put(var, rowData);
                }
                else
                {
                    facesContext.getExternalContext().getRequestMap().remove(var);

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     * component is therefore used to cache the datamodel for each row of the table. In the normal case where this table
     * is not nested inside a component that changes its id (like a table does) then this map only ever has one entry.
     */
    protected DataModel getDataModel()
    {
        DataModel dataModel;
        String clientID = "";


        UIComponent parent = getParent();
        if (parent != null)
        {

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        // save child state
        this.saveChildState(ctx);


        this.index = index;
        DataModel localModel = getDataModel();
        localModel.setRowIndex(index);


        if (this.index != -1 && this.var != null && localModel.isRowAvailable()) {
            Map<String,Object> attrs = ctx.getExternalContext().getRequestMap();
            attrs.put(var, localModel.getRowData());
        }


        // restore child state
        this.restoreChildState(ctx);
    }

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    if (modelMap != null) {
      OrderingListDataModel dataModel = new OrderingListDataModel();
      dataModel.setWrappedData(modelMap);
      return dataModel;
    } else {
      DataModel dataModel = createDataModel(getValue());
      return new SequenceDataModel(dataModel);
    }
  }

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