Field Detail

• COMPONENT_TYPE

  public static final java.lang.String COMPONENT_TYPE

  The standard component type for this component.

  See Also:

  Constant Field Values

• COMPONENT_FAMILY

  public static final java.lang.String COMPONENT_FAMILY

  The standard component family for this component.

  See Also:

  Constant Field Values

Constructor Detail

• UIData

  public UIData()

  Create a new UIData instance with default property values.

Method Detail

• getFamily

  public java.lang.String getFamily()

  Description copied from class: UIComponent

  Return the identifier of the component family to which this component belongs. This identifier, in conjunction with the value of the rendererType property, may be used to select the appropriate Renderer for this component instance. Note this method should NOT return null

  Specified by:

  getFamily in class UIComponent

  Returns:

  the component family (not null).

• getFirst

  public int getFirst()

  Return the zero-relative row number of the first row to be displayed.

  Returns:

  the row number.

• setFirst

  public void setFirst(int first)

  Set the zero-relative row number of the first row to be displayed.

  Parameters:

  first - New first row number

  Throws:

  java.lang.IllegalArgumentException - if first is negative

• getFooter

  public UIComponent getFooter()

  Return the footer facet of this component (if any). A convenience method for getFacet("footer").

  Returns:

  the footer facet.

• setFooter

  public void setFooter(UIComponent footer)

  Set the footer facet of this component. A convenience method for getFacets().put("footer", footer).

  Parameters:

  footer - the new footer facet

  Throws:

  java.lang.NullPointerException - if footer is null

• getHeader

  public UIComponent getHeader()

  Return the header facet of this component (if any). A convenience method for getFacet("header").

  Returns:

  the header facet.

• setHeader

  public void setHeader(UIComponent header)

  Set the header facet of this component. A convenience method for getFacets().put("header", header).

  Parameters:

  header - the new header facet

  Throws:

  java.lang.NullPointerException - if header is null

• isRowAvailable

  public boolean isRowAvailable()

  Return a flag indicating whether there is rowData available at the current rowIndex. If no wrappedData is available, return false.

  Returns:

  whether the row is available.

  Throws:

  FacesException - if an error occurs getting the row availability

• getRowCount

  public int getRowCount()

  Return the number of rows in the underlying data model. If the number of available rows is unknown, return -1.

  Returns:

  the row count.

  Throws:

  FacesException - if an error occurs getting the row count

• getRowData

  public java.lang.Object getRowData()

  Return the data object representing the data for the currently selected row index, if any.

  Returns:

  the row data.

  Throws:

  FacesException - if an error occurs getting the row data

  java.lang.IllegalArgumentException - if now row data is available at the currently specified row index

• getRowIndex

  public int getRowIndex()

  Return the zero-relative index of the currently selected row. If we are not currently positioned on a row, return -1. This property is not enabled for value binding expressions.

  Returns:

  the row index.

  Throws:

  FacesException - if an error occurs getting the row index

• setRowIndex

  public void setRowIndex(int rowIndex)

  Set the zero relative index of the current row, or -1 to indicate that no row is currently selected, by implementing the following algorithm. It is possible to set the row index at a value for which the underlying data collection does not contain any row data. Therefore, callers may use the isRowAvailable() method to detect whether row data will be available for use by the getRowData() method.

  To support transient state among descendents, please consult the specification for setRowStatePreserved(boolean), which details the requirements for setRowIndex() when the rowStatePreserved JavaBeans property is set to true.

  • Save current state information for all descendant components (as described below).
  • Store the new row index, and pass it on to the DataModel associated with this UIData instance.
  • If the new rowIndex value is -1:
    • If the var property is not null, remove the corresponding request scope attribute (if any).
    • Reset the state information for all descendant components (as described below).
  • If the new rowIndex value is not -1:
    • If the var property is not null, call getRowData() and expose the resulting data object as a request scope attribute whose key is the var property value.
    • Reset the state information for all descendant components (as described below).

  To save current state information for all descendant components, UIData must maintain per-row information for each descendant as follows:

  • If the descendant is an instance of EditableValueHolder, save the state of its localValue property.
  • If the descendant is an instance of EditableValueHolder, save the state of the localValueSet property.
  • If the descendant is an instance of EditableValueHolder, save the state of the valid property.
  • If the descendant is an instance of EditableValueHolder, save the state of the submittedValue property.

  To restore current state information for all descendant components, UIData must reference its previously stored information for the current rowIndex and call setters for each descendant as follows:

  • If the descendant is an instance of EditableValueHolder, restore the value property.
  • If the descendant is an instance of EditableValueHolder, restore the state of the localValueSet property.
  • If the descendant is an instance of EditableValueHolder, restore the state of the valid property.
  • If the descendant is an instance of EditableValueHolder, restore the state of the submittedValue property.

  Parameters:

  rowIndex - The new row index value, or -1 for no associated row

  Throws:

  FacesException - if an error occurs setting the row index

  java.lang.IllegalArgumentException - if rowIndex is less than -1

• getRows

  public int getRows()

  Return the number of rows to be displayed, or zero for all remaining rows in the table. The default value of this property is zero.

  Returns:

  the number of rows.

• setRows

  public void setRows(int rows)

  Set the number of rows to be displayed, or zero for all remaining rows in the table.

  Parameters:

  rows - New number of rows

  Throws:

  java.lang.IllegalArgumentException - if rows is negative

• getVar

  public java.lang.String getVar()

  Return the request-scope attribute under which the data object for the current row will be exposed when iterating. This property is not enabled for value binding expressions.

  Returns:

  he request-scope attribute.

• setVar

  public void setVar(java.lang.String var)

  Set the request-scope attribute under which the data object for the current row wil be exposed when iterating.

  Parameters:

  var - The new request-scope attribute name

• isRowStatePreserved

  public boolean isRowStatePreserved()

  Return the value of the rowStatePreserved JavaBeans property. See setRowStatePreserved(boolean).

  Returns:

  the value of the rowStatePreserved.

  Since:

  2.1

• setRowStatePreserved

  public void setRowStatePreserved(boolean preserveComponentState)

  If this property is set to true, the UIData must take steps to ensure that modifications to its iterated children will be preserved on a per-row basis. This allows applications to modify component properties, such as the style-class, for a specific row, rather than having such modifications apply to all rows.

  To accomplish this, UIData must call StateHolder.saveState(jakarta.faces.context.FacesContext) and TransientStateHolder.saveTransientState(jakarta.faces.context.FacesContext) on its children to capture their state on exiting each row. When re-entering the row, StateHolder.restoreState(jakarta.faces.context.FacesContext, java.lang.Object) and TransientStateHolder.restoreTransientState(jakarta.faces.context.FacesContext, java.lang.Object) must be called in order to reinitialize the children to the correct state for the new row. All of this action must take place during the processing of setRowIndex(int).

  Users should consider enabling this feature for cases where it is necessary to modify properties of UIData's children in a row-specific way. Note, however, that row-level state saving/restoring does add overhead. As such, this feature should be used judiciously.

  Parameters:

  preserveComponentState - the flag if the state should be preserved.

  Since:

  2.1

• getValue

  public java.lang.Object getValue()

  Return the value of the UIData. This value must either be be of type DataModel, or a type that can be adapted into a DataModel. UIData will automatically adapt the following types:

  • Arrays
  • java.util.List
  • java.sql.ResultSet
  • jakarta.servlet.jsp.jstl.sql.Result
  • java.util.Collection

  All other types will be adapted using the ScalarDataModel class, which will treat the object as a single row of data.

  Returns:

  the object for the value.

• setValue

  public void setValue(java.lang.Object value)

  Set the value of the UIData. This value must either be be of type DataModel, or a type that can be adapted into a DataModel.

  Parameters:

  value - the new value

• setValueBinding

  @Deprecated
  public void setValueBinding(java.lang.String name,
                                          ValueBinding binding)

  Deprecated. This has been replaced by setValueExpression(java.lang.String, jakarta.el.ValueExpression).

  If "name" is something other than "value", "var", or "rowIndex", rely on the superclass conversion from ValueBinding to ValueExpression.

  Overrides:

  setValueBinding in class UIComponentBase

  Parameters:

  name - Name of the attribute or property for which to set a ValueBinding

  binding - The ValueBinding to set, or null to remove any currently set ValueBinding

  Throws:

  java.lang.IllegalArgumentException - if name is one of id, parent, var, or rowIndex

  java.lang.NullPointerException - if name is null

• setValueExpression

  public void setValueExpression(java.lang.String name,
                                 ValueExpression binding)

  Set the ValueExpression used to calculate the value for the specified attribute or property name, if any. In addition, if a ValueExpression is set for the value property, remove any synthesized DataModel for the data previously bound to this component.

  Overrides:

  setValueExpression in class UIComponent

  Parameters:

  name - Name of the attribute or property for which to set a ValueExpression

  binding - The ValueExpression to set, or null to remove any currently set ValueExpression

  Throws:

  java.lang.IllegalArgumentException - if name is one of id, parent, var, or rowIndex

  java.lang.NullPointerException - if name is null

  Since:

  1.2

• getClientId

  public java.lang.String getClientId(FacesContext context)

  Return a client identifier for this component that includes the current value of the rowIndex property, if it is not set to -1. This implies that multiple calls to getClientId() may return different results, but ensures that child components can themselves generate row-specific client identifiers (since UIData is a NamingContainer).

  Overrides:

  getClientId in class UIComponentBase

  Parameters:

  context - The FacesContext for the current request

  Returns:

  the client id.

  Throws:

  java.lang.NullPointerException - if context is null

• invokeOnComponent

  public boolean invokeOnComponent(FacesContext context,
                                   java.lang.String clientId,
                                   ContextCallback callback)
                            throws FacesException

  Override behavior from UIComponentBase.invokeOnComponent(jakarta.faces.context.FacesContext, java.lang.String, jakarta.faces.component.ContextCallback) to provide special care for positioning the data properly before finding the component and invoking the callback on it. If the argument clientId is equal to this.getClientId() simply invoke the contextCallback, passing the context argument and this as arguments, and return true. If the argument clientId is not equal to this.getClientId(), inspect each of the facet children of this UIData instance and for each one, compare its clientId with the argument clientId. If there is a match, invoke the contextCallback, passing the context argument and this as arguments, and return true. Otherwise, attempt to extract a rowIndex from the clientId. For example, if the argument clientId was form:data:3:customerHeader the rowIndex would be 3. Let this value be called newIndex. The current rowIndex of this instance must be saved aside and restored before returning in all cases, regardless of the outcome of the search or if any exceptions are thrown in the process.

  The implementation of this method must never return true if setting the rowIndex of this instance to be equal to newIndex causes this instance to return false from isRowAvailable().

  Overrides:

  invokeOnComponent in class UIComponentBase

  Parameters:

  context - the FacesContext for the current request

  clientId - the client identifier of the component to be passed to the argument callback.

  callback - an implementation of the Callback interface.

  Returns:

  true if the a component with the given clientId is found, the callback method was successfully invoked passing that component as an argument, and no Exception was thrown. Returns false if no component with the given clientId is found.

  Throws:

  java.lang.NullPointerException - if any of the arguments are null

  FacesException - if the argument Callback throws an Exception, it is wrapped in a FacesException and re-thrown. Also throws FacesException if any exception is thrown when deriving the rowIndex from the argument clientId.

  Since:

  1.2

• queueEvent

  public void queueEvent(FacesEvent event)

  Override the default UIComponentBase.queueEvent(jakarta.faces.event.FacesEvent) processing to wrap any queued events in a wrapper so that we can reset the current row index in broadcast().

  Overrides:

  queueEvent in class UIComponentBase

  Parameters:

  event - FacesEvent to be queued

  Throws:

  java.lang.IllegalStateException - if this component is not a descendant of a UIViewRoot

  java.lang.NullPointerException - if event is null

• broadcast

  public void broadcast(FacesEvent event)
                 throws AbortProcessingException

  Override the default UIComponentBase.broadcast(jakarta.faces.event.FacesEvent) processing to unwrap any wrapped FacesEvent and reset the current row index, before the event is actually broadcast. For events that we did not wrap (in queueEvent()), default processing will occur.

  Overrides:

  broadcast in class UIComponentBase

  Parameters:

  event - The FacesEvent to be broadcast

  Throws:

  AbortProcessingException - Signal the Jakarta Server Faces implementation that no further processing on the current event should be performed

  java.lang.IllegalArgumentException - if the implementation class of this FacesEvent is not supported by this component

  java.lang.NullPointerException - if event is null

• encodeBegin

  public void encodeBegin(FacesContext context)
                   throws java.io.IOException

  In addition to the default behavior, ensure that any saved per-row state for our child input components is discarded unless it is needed to rerender the current page with errors.

  Overrides:

  encodeBegin in class UIComponentBase

  Parameters:

  context - FacesContext for the current request

  Throws:

  java.io.IOException - if an input/output error occurs while rendering

  java.lang.NullPointerException - if context is null

• processDecodes

  public void processDecodes(FacesContext context)

  Override the default UIComponentBase.processDecodes(jakarta.faces.context.FacesContext) processing to perform the following steps.

  • If the rendered property of this UIComponent is false, skip further processing.
  • Set the current rowIndex to -1.
  • Call the processDecodes() method of all facets of this UIData, in the order determined by a call to getFacets().keySet().iterator().
  • Call the processDecodes() method of all facets of the UIColumn children of this UIData.
  • Iterate over the set of rows that were included when this component was rendered (i.e. those defined by the first and rows properties), performing the following processing for each row:
    • Set the current rowIndex to the appropriate value for this row.
    • If isRowAvailable() returns true, iterate over the children components of each UIColumn child of this UIData component, calling the processDecodes() method for each such child.
  • Set the current rowIndex to -1.
  • Call the decode() method of this component.
  • If a RuntimeException is thrown during decode processing, call FacesContext.renderResponse() and re-throw the exception.

  Overrides:

  processDecodes in class UIComponentBase

  Parameters:

  context - FacesContext for the current request

  Throws:

  java.lang.NullPointerException - if context is null

• processValidators

  public void processValidators(FacesContext context)

  Override the default UIComponentBase.processValidators(jakarta.faces.context.FacesContext) processing to perform the following steps.

  • If the rendered property of this UIComponent is false, skip further processing.
  • Set the current rowIndex to -1.
  • Call the processValidators() method of all facets of this UIData, in the order determined by a call to getFacets().keySet().iterator().
  • Call the processValidators() method of all facets of the UIColumn children of this UIData.
  • Iterate over the set of rows that were included when this component was rendered (i.e. those defined by the first and rows properties), performing the following processing for each row:
    • Set the current rowIndex to the appropriate value for this row.
    • If isRowAvailable() returns true, iterate over the children components of each UIColumn child of this UIData component, calling the processValidators() method for each such child.
  • Set the current rowIndex to -1.

  Overrides:

  processValidators in class UIComponentBase

  Parameters:

  context - FacesContext for the current request

  Throws:

  java.lang.NullPointerException - if context is null

  See Also:

  PreValidateEvent, PostValidateEvent

• processUpdates

  public void processUpdates(FacesContext context)

  Override the default UIComponentBase.processUpdates(jakarta.faces.context.FacesContext) processing to perform the following steps.

  • If the rendered property of this UIComponent is false, skip further processing.
  • Set the current rowIndex to -1.
  • Call the processUpdates() method of all facets of this UIData, in the order determined by a call to getFacets().keySet().iterator().
  • Call the processUpdates() method of all facets of the UIColumn children of this UIData.
  • Iterate over the set of rows that were included when this component was rendered (i.e. those defined by the first and rows properties), performing the following processing for each row:
    • Set the current rowIndex to the appropriate value for this row.
    • If isRowAvailable() returns true, iterate over the children components of each UIColumn child of this UIData component, calling the processUpdates() method for each such child.
  • Set the current rowIndex to -1.

  Overrides:

  processUpdates in class UIComponentBase

  Parameters:

  context - FacesContext for the current request

  Throws:

  java.lang.NullPointerException - if context is null

• createUniqueId

  public java.lang.String createUniqueId(FacesContext context,
                                         java.lang.String seed)

  Description copied from interface: UniqueIdVendor

  Generate an identifier for a component. The identifier will be prefixed with UNIQUE_ID_PREFIX, and will be unique within this component-container. Optionally, a unique seed value can be supplied by component creators which should be included in the generated unique id.

  Specified by:

  createUniqueId in interface UniqueIdVendor

  Parameters:

  context - FacesContext

  seed - an optional seed value - e.g. based on the position of the component in the VDL-template

  Returns:

  a unique-id in this component-container

• visitTree

  public boolean visitTree(VisitContext context,
                           VisitCallback callback)

  Override the behavior in UIComponent.visitTree(jakarta.faces.component.visit.VisitContext, jakarta.faces.component.visit.VisitCallback) to handle iteration correctly.

  If the UIComponent.isVisitable(jakarta.faces.component.visit.VisitContext) method of this instance returns false, take no action and return.

  Call UIComponent.pushComponentToEL(jakarta.faces.context.FacesContext, jakarta.faces.component.UIComponent) and invoke the visit callback on this UIData instance as described in UIComponent.visitTree(jakarta.faces.component.visit.VisitContext, jakarta.faces.component.visit.VisitCallback). Let the result of the invoctaion be visitResult. If visitResult is VisitResult.COMPLETE, take no further action and return true. Otherwise, determine if we need to visit our children. The default implementation calls VisitContext.getSubtreeIdsToVisit(jakarta.faces.component.UIComponent) passing this as the argument. If the result of that call is non-empty, let doVisitChildren be true. If doVisitChildren is true and visitResult is VisitResult.ACCEPT, take the following action.

  • If this component has facets, call UIComponent.getFacets() on this instance and invoke the values() method. For each UIComponent in the returned Map, call UIComponent.visitTree(jakarta.faces.component.visit.VisitContext, jakarta.faces.component.visit.VisitCallback).

  • If this component has children, for each UIColumn child:

    Call VisitContext.invokeVisitCallback(jakarta.faces.component.UIComponent, jakarta.faces.component.visit.VisitCallback) on that UIColumn instance. If such a call returns true, terminate visiting and return true from this method.

    If the child UIColumn has facets, call UIComponent.visitTree(jakarta.faces.component.visit.VisitContext, jakarta.faces.component.visit.VisitCallback) on each one.

    Take no action on non-UIColumn children.

  • Save aside the result of a call to getRowIndex().

    For each child component of this UIData that is also an instance of UIColumn,

    Iterate over the rows.

    • Let rowsToProcess be the return from getRows().

    • Let rowIndex be the return from getFirst() - 1.

    • While the number of rows processed is less than rowsToProcess, take the following actions.

      Call setRowIndex(int), passing the current row index.

      If isRowAvailable() returns false, take no further action and return false.

      Call UIComponent.visitTree(jakarta.faces.component.visit.VisitContext, jakarta.faces.component.visit.VisitCallback) on each of the children of this UIColumn instance.

  Call UIComponent.popComponentFromEL(jakarta.faces.context.FacesContext) and restore the saved row index with a call to setRowIndex(int).

  Return false to allow the visiting to continue.

  Overrides:

  visitTree in class UIComponent

  Parameters:

  context - the VisitContext that provides context for performing the visit.

  callback - the callback to be invoked for each node encountered in the visit.

  Returns:

  component implementations may return true to indicate that the tree visit is complete (eg. all components that need to be visited have been visited). This results in the tree visit being short-circuited such that no more components are visited.