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.

     * 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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  public void setLocalValueSet(boolean localValueSet) {
    this.localValueSet = localValueSet;
  }


  protected DataModel createDataModel(Object value) {
    DataModel dataModel;
        
        if (value == null) {
            dataModel = new ListDataModel(Collections.EMPTY_LIST);
        } else if (value instanceof List) {
          dataModel = new ListDataModel((List) value);

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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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      dataModel.setWrappedData(source);
      
      return dataModel;
    }
    
    DataModel sourceDataModel = createDataModel(getSourceValue());
    DataModel targetDataModel = createDataModel(getTargetValue());


    ListShuttleDataModel dataModel = new ListShuttleDataModel();
    dataModel.setWrappedData(new DataModel[]{sourceDataModel, targetDataModel});
    return dataModel;
  }

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  public void setLocalValueSet(boolean localValueSet) {
    this.localValueSet = localValueSet;
  }


  protected DataModel createDataModel(Object value) {
    DataModel dataModel;
        
        if (value == null) {
            dataModel = new ListDataModel(Collections.EMPTY_LIST);
        } else if (value instanceof List) {
          dataModel = new ListDataModel((List) value);

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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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        // Save current state for the previous row index
        saveDescendantState();


        // Update to the new row index        
        this.rowIndex = rowIndex;
        DataModel localModel = getDataModel();
        localModel.setRowIndex(rowIndex);


        // Clear or expose the current row data as a request scope attribute
        if (var != null) {
            Map<String, Object> requestMap =
                 getFacesContext().getExternalContext().getRequestMap();

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        // save child state
        this.saveChildState();


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


        if (this.index != -1 && this.var != null && localModel.isRowAvailable()) {
            FacesContext faces = FacesContext.getCurrentInstance();
            Map attrs = faces.getExternalContext().getRequestMap();
            attrs.put(var, localModel.getRowData());
        }


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

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        // Save current state for the previous row index
        saveDescendantState();


        // Update to the new row index        
        this.rowIndex = rowIndex;
        DataModel localModel = getDataModel();
        localModel.setRowIndex(rowIndex);
        
        // if rowIndex is -1, clear the cache
        if (rowIndex == -1) {
            setDataModel(null);
        }

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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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