javax.faces.component.UIData Maven / Gradle / Ivy
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package javax.faces.component;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.FacesEvent;
import javax.faces.event.FacesListener;
import javax.faces.event.PhaseId;
import javax.faces.model.ArrayDataModel;
import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;
import javax.faces.model.ResultDataModel;
import javax.faces.model.ResultSetDataModel;
import javax.faces.model.ScalarDataModel;
import javax.servlet.jsp.jstl.sql.Result;
import java.io.IOException;
import java.io.Serializable;
import java.sql.ResultSet;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Iterator;
/**
* UIData is a {@link UIComponent} that supports data
* binding to a collection of data objects represented by a {@link DataModel}
* instance, which is the current value of this component itself (typically
* established via a {@link ValueExpression}). During iterative processing over
* the rows of data in the data model, the object for the current row is exposed
* as a request attribute under the key specified by the var
* property.
*
* Only children of type {@link UIColumn} should be processed by renderers
* associated with this component.
*
* By default, the rendererType property is set to
* javax.faces.Table. This value can be changed by calling the
* setRendererType() method.
*/
public class UIData extends UIComponentBase
implements NamingContainer {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.Data";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.Data";
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UIData} instance with default property
* values.
*/
public UIData() {
super();
setRendererType("javax.faces.Table");
}
// ------------------------------------------------------ Instance Variables
/**
* The first row number (zero-relative) to be displayed.
*/
private Integer first;
/**
* The {@link DataModel} associated with this component, lazily
* instantiated if requested. This object is not part of the saved and
* restored state of the component.
*/
private DataModel model = null;
/**
* During iteration through the rows of this table, This ivar is used to
* store the previous "var" value for this instance. When the row iteration
* is complete, this value is restored to the request map.
*/
private Object oldVar;
/**
*
The zero-relative index of the current row number, or -1 for no
* current row association.
*/
private int rowIndex = -1;
/**
* The number of rows to display, or zero for all remaining rows in the
* table.
*/
private Integer rows;
/**
* This map contains SavedState instances for each
* descendant component, keyed by the client identifier of the descendant.
* Because descendant client identifiers will contain the
* rowIndex value of the parent, per-row state information is
* actually preserved.
*/
@SuppressWarnings({"CollectionWithoutInitialCapacity"})
private Map saved = new HashMap();
/**
* The local value of this {@link UIComponent}.
*/
private Object value = null;
/**
* The request scope attribute under which the data object for the
* current row will be exposed when iterating.
*/
private String var = null;
/**
* Holds the base client ID that will be used to generate per-row
* client IDs (this will be null if this UIData is nested within another).
*
* This is not part of the component state.
*/
private String baseClientId = null;
/**
* Length of the cached baseClientId plus one for the
* NamingContainer.SEPARATOR_CHAR.
*
* This is not part of the component state.
*/
private int baseClientIdLength;
/**
* StringBuilder used to build per-row client IDs.
*
* This is not part of the component state.
*/
private StringBuilder clientIdBuilder = null;
/**
* Flag indicating whether or not this UIData instance is nested
* within another UIData instance
*
* This is not part of the component state.
*/
private Boolean isNested = null;
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
/**
* Return the zero-relative row number of the first row to be
* displayed.
*/
public int getFirst() {
if (this.first != null) {
return (this.first);
}
ValueExpression ve = getValueExpression("first");
if (ve != null) {
Integer value;
try {
value = (Integer) ve.getValue(getFacesContext().getELContext());
}
catch (ELException e) {
throw new FacesException(e);
}
if (null == value) {
return first;
}
return (value.intValue());
} else {
return (0);
}
}
/**
* Set the zero-relative row number of the first row to be
* displayed.
*
* @param first New first row number
*
* @throws IllegalArgumentException if first is negative
*/
public void setFirst(int first) {
if (first < 0) {
throw new IllegalArgumentException(String.valueOf(first));
}
this.first = first;
}
/**
* Return the footer facet of this component (if any). A convenience
* method for getFacet("footer").
*/
public UIComponent getFooter() {
return getFacet("footer");
}
/**
* Set the footer facet of this component. A convenience method for
* getFacets().put("footer", footer).
*
* @param footer the new footer facet
*
* @throws NullPointerException if footer is null
*/
public void setFooter(UIComponent footer) {
getFacets().put("footer", footer);
}
/**
* Return the header facet of this component (if any). A convenience
* method for getFacet("header").
*/
public UIComponent getHeader() {
return getFacet("header");
}
/**
* Set the header facet of this component. A convenience method for
* getFacets().put("header", header).
*
* @param header the new header facet
*
* @throws NullPointerException if header is null
*/
public void setHeader(UIComponent header) {
getFacets().put("header", header);
}
/**
* Return a flag indicating whether there is rowData
* available at the current rowIndex. If no
* wrappedData is available, return false.
*
* @throws FacesException if an error occurs getting the row availability
*/
public boolean isRowAvailable() {
return (getDataModel().isRowAvailable());
}
/**
* Return the number of rows in the underlying data model. If the number
* of available rows is unknown, return -1.
*
* @throws FacesException if an error occurs getting the row count
*/
public int getRowCount() {
return (getDataModel().getRowCount());
}
/**
* Return the data object representing the data for the currently
* selected row index, if any.
*
* @throws FacesException if an error occurs getting the row data
* @throws IllegalArgumentException if now row data is available at the
* currently specified row index
*/
public Object getRowData() {
return (getDataModel().getRowData());
}
/**
* 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.
*
* @throws FacesException if an error occurs getting the row index
*/
public int getRowIndex() {
return (this.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.
*
*
* - Save current state information for all descendant components (as
* described below).
*
- Store the new row index, and pass it on to the {@link DataModel}
* associated with this {@link 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,
* {@link 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,
* {@link 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.
*
*
* @param rowIndex The new row index value, or -1 for no associated row
*
* @throws FacesException if an error occurs setting the row index
* @throws IllegalArgumentException if rowIndex
* is less than -1
*/
public void setRowIndex(int rowIndex) {
// 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 requestMap =
getFacesContext().getExternalContext().getRequestMap();
if (rowIndex == -1) {
oldVar = requestMap.remove(var);
} else if (isRowAvailable()) {
requestMap.put(var, getRowData());
} else {
requestMap.remove(var);
if (null != oldVar) {
requestMap.put(var, oldVar);
oldVar = null;
}
}
}
// Reset current state information for the new row index
restoreDescendantState();
}
/**
* 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.
*/
public int getRows() {
if (this.rows != null) {
return (this.rows);
}
ValueExpression ve = getValueExpression("rows");
if (ve != null) {
Integer value;
try {
value = (Integer) ve.getValue(getFacesContext().getELContext());
}
catch (ELException e) {
throw new FacesException(e);
}
if (null == value) {
return rows;
}
return (value.intValue());
} else {
return (0);
}
}
/**
* Set the number of rows to be displayed, or zero for all remaining rows
* in the table.
*
* @param rows New number of rows
*
* @throws IllegalArgumentException if rows is negative
*/
public void setRows(int rows) {
if (rows < 0) {
throw new IllegalArgumentException(String.valueOf(rows));
}
this.rows = rows;
}
/**
* 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.
*/
public String getVar() {
return (this.var);
}
/**
* Set the request-scope attribute under which the data object for the
* current row wil be exposed when iterating.
*
* @param var The new request-scope attribute name
*/
public void setVar(String var) {
this.var = var;
}
// ----------------------------------------------------- StateHolder Methods
private Object[] values;
public Object saveState(FacesContext context) {
if (values == null) {
values = new Object[7];
}
values[0] = super.saveState(context);
values[1] = first;
values[2] = rowIndex;
values[3] = rows;
values[4] = saved;
values[5] = value;
values[6] = var;
return (values);
}
public void restoreState(FacesContext context, Object state) {
values = (Object[]) state;
super.restoreState(context, values[0]);
first = (Integer) values[1];
rowIndex = (Integer) values[2];
rows = (Integer) values[3];
saved = TypedCollections
.dynamicallyCastMap((Map) values[4], String.class, SavedState.class);
value = values[5];
var = (String) values[6];
}
/**
* Return the value of the UIData. This value must either be
* be of type {@link DataModel}, or a type that can be adapted
* into a {@link DataModel}. UIData will automatically
* adapt the following types:
*
* - Arrays
* java.util.Listjava.sql.ResultSetjavax.servlet.jsp.jstl.sql.Result
* All other types will be adapted using the {@link ScalarDataModel}
* class, which will treat the object as a single row of data.
*/
public Object getValue() {
if (this.value != null) {
return (this.value);
}
ValueExpression ve = getValueExpression("value");
if (ve != null) {
try {
return (ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
/**
* Set the value of the UIData. This value must either be
* be of type {@link DataModel}, or a type that can be adapted into a {@link
* DataModel}.
*
* @param value the new value
*/
public void setValue(Object value) {
setDataModel(null);
this.value = value;
}
// ----------------------------------------------------- UIComponent Methods
/**
* If "name" is something other than "value", "var", or "rowIndex", rely
* on the superclass conversion from ValueBinding to
* ValueExpression.
*
* @param name Name of the attribute or property for which to set a
* {@link ValueBinding}
* @param binding The {@link ValueBinding} to set, or null to
* remove any currently set {@link ValueBinding}
*
* @throws IllegalArgumentException if name is one of
* id, parent,
* var, or rowIndex
* @throws NullPointerException if name is null
* @deprecated This has been replaced by {@link #setValueExpression(java.lang.String,
*javax.el.ValueExpression)}.
*/
public void setValueBinding(String name, ValueBinding binding) {
if ("value".equals(name)) {
setDataModel(null);
} else if ("var".equals(name) || "rowIndex".equals(name)) {
throw new IllegalArgumentException();
}
super.setValueBinding(name, binding);
}
/**
* Set the {@link ValueExpression} used to calculate the value for the
* specified attribute or property name, if any. In addition, if a {@link
* ValueExpression} is set for the value property, remove any
* synthesized {@link DataModel} for the data previously bound to this
* component.
*
* @param name Name of the attribute or property for which to set a
* {@link ValueExpression}
* @param binding The {@link ValueExpression} to set, or null
* to remove any currently set {@link ValueExpression}
*
* @throws IllegalArgumentException if name is one of
* id, parent,
* var, or rowIndex
* @throws NullPointerException if name is null
* @since 1.2
*/
public void setValueExpression(String name, ValueExpression binding) {
if ("value".equals(name)) {
this.model = null;
} else if ("var".equals(name) || "rowIndex".equals(name)) {
throw new IllegalArgumentException();
}
super.setValueExpression(name, binding);
}
/**
* 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 {@link UIData}
* is a {@link NamingContainer}).
*
* @throws NullPointerException if context is null
*/
public String getClientId(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
// If baseClientId and clientIdBuilder are both null, this is the
// first time that getClientId() has been called.
// If we're not nested within another UIData, then:
// - create a new StringBuilder assigned to clientIdBuilder containing
// our client ID.
// - toString() the builder - this result will be our baseClientId
// for the duration of the component
// - append SEPARATOR_CHAR to the builder
// If we are nested within another UIData, then:
// - create an empty StringBuilder that will be used to build
// this instance's ID
if (baseClientId == null && clientIdBuilder == null) {
if (!isNestedWithinUIData()) {
clientIdBuilder = new StringBuilder(super.getClientId(context));
baseClientId = clientIdBuilder.toString();
baseClientIdLength = (baseClientId.length() + 1);
clientIdBuilder.append(NamingContainer.SEPARATOR_CHAR);
clientIdBuilder.setLength(baseClientIdLength);
} else {
clientIdBuilder = new StringBuilder();
}
}
if (rowIndex >= 0) {
String cid;
if (!isNestedWithinUIData()) {
// we're not nested, so the clientIdBuilder is already
// primed with clientID + SEPARATOR_CHAR. Append
// the current rowIndex, and toString() the builder.
// reset the builder to it's primed state.
cid = clientIdBuilder.append(rowIndex).toString();
clientIdBuilder.setLength(baseClientIdLength);
} else {
// we're nested, so we have to build the ID from scratch
// each time. Reuse the same clientIdBuilder instance
// for each call by resetting the length to 0 after
// the ID has been computed.
cid = clientIdBuilder.append(super.getClientId(context))
.append(NamingContainer.SEPARATOR_CHAR).append(rowIndex)
.toString();
clientIdBuilder.setLength(0);
}
return (cid);
} else {
if (!isNestedWithinUIData()) {
// Not nested and no row available, so just return our baseClientId
return (baseClientId);
} else {
// nested and no row available, return the result of getClientId().
// this is necessary as the client ID will reflect the row that
// this table represents
return super.getClientId(context);
}
}
}
/**
* Override behavior from {@link UIComponentBase#invokeOnComponent} 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.
* 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 {@link #isRowAvailable}.
*
* @throws NullPointerException {@inheritDoc}
* @throws FacesException {@inheritDoc} Also throws FacesException
* if any exception is thrown when deriving the
* rowIndex from the argument clientId.
* @since 1.2
*/
public boolean invokeOnComponent(FacesContext context, String clientId,
ContextCallback callback)
throws FacesException {
if (null == context || null == clientId || null == callback) {
throw new NullPointerException();
}
String myId = super.getClientId(context);
boolean found = false;
if (clientId.equals(myId)) {
try {
callback.invokeContextCallback(context, this);
return true;
}
catch (Exception e) {
throw new FacesException(e);
}
}
// check the facets, if any, of UIData
if (this.getFacetCount() > 0) {
for (Iterator i = this.getFacets().values().iterator(); i.hasNext(); ) {
UIComponent c = i.next();
if (clientId.equals(c.getClientId(context))) {
callback.invokeContextCallback(context, c);
return true;
}
}
}
int lastSep, newRow, savedRowIndex = this.getRowIndex();
try {
// If we need to strip out the rowIndex from our id
// PENDING(edburns): is this safe with respect to I18N?
if (myId.endsWith(NamingContainer.SEPARATOR_CHAR + Integer.toString(savedRowIndex, 10))) {
lastSep = myId.lastIndexOf(NamingContainer.SEPARATOR_CHAR);
assert (-1 != lastSep);
myId = myId.substring(0, lastSep);
}
// myId will be something like form:outerData for a non-nested table,
// and form:outerData:3:data for a nested table.
// clientId will be something like form:outerData:3:outerColumn
// for a non-nested table. clientId will be something like
// outerData:3:data:3:input for a nested table.
if (clientId.startsWith(myId)) {
int preRowIndexSep, postRowIndexSep;
if (-1 != (preRowIndexSep =
clientId.indexOf(NamingContainer.SEPARATOR_CHAR,
myId.length()))) {
// Check the length
if (++preRowIndexSep < clientId.length()) {
if (-1 != (postRowIndexSep =
clientId.indexOf(NamingContainer.SEPARATOR_CHAR,
preRowIndexSep + 1))) {
try {
newRow = Integer
.valueOf(clientId.substring(preRowIndexSep,
postRowIndexSep))
.intValue();
} catch (NumberFormatException ex) {
// PENDING(edburns): I18N
String message =
"Trying to extract rowIndex from clientId \'"
+
clientId
+ "\' "
+ ex.getMessage();
throw new NumberFormatException(message);
}
this.setRowIndex(newRow);
if (this.isRowAvailable()) {
found = super.invokeOnComponent(context,
clientId,
callback);
}
}
}
}
}
}
catch (FacesException fe) {
throw fe;
}
catch (Exception e) {
throw new FacesException(e);
}
finally {
this.setRowIndex(savedRowIndex);
}
return found;
}
/**
* Override the default {@link UIComponentBase#queueEvent} processing to
* wrap any queued events in a wrapper so that we can reset the current row
* index in broadcast().
*
* @param event {@link FacesEvent} to be queued
*
* @throws IllegalStateException if this component is not a descendant of a
* {@link UIViewRoot}
* @throws NullPointerException if event is null
*/
public void queueEvent(FacesEvent event) {
super.queueEvent(new WrapperEvent(this, event, getRowIndex()));
}
/**
* Override the default {@link UIComponentBase#broadcast} processing to
* unwrap any wrapped {@link 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.
*
* @param event The {@link FacesEvent} to be broadcast
*
* @throws AbortProcessingException Signal the JavaServer Faces
* implementation that no further
* processing on the current event should
* be performed
* @throws IllegalArgumentException if the implementation class of this
* {@link FacesEvent} is not supported by
* this component
* @throws NullPointerException if event is null
*/
public void broadcast(FacesEvent event)
throws AbortProcessingException {
if (!(event instanceof WrapperEvent)) {
super.broadcast(event);
return;
}
// Set up the correct context and fire our wrapped event
WrapperEvent revent = (WrapperEvent) event;
if (isNestedWithinUIData()) {
setDataModel(null);
}
int oldRowIndex = getRowIndex();
setRowIndex(revent.getRowIndex());
FacesEvent rowEvent = revent.getFacesEvent();
rowEvent.getComponent().broadcast(rowEvent);
setRowIndex(oldRowIndex);
}
/**
* 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.
*
* @param context FacesContext for the current request
*
* @throws IOException if an input/output error occurs while
* rendering
* @throws NullPointerException if context is null
*/
public void encodeBegin(FacesContext context) throws IOException {
setDataModel(null); // re-evaluate even with server-side state saving
if (!keepSaved(context)) {
//noinspection CollectionWithoutInitialCapacity
saved = new HashMap();
}
super.encodeBegin(context);
}
/**
* Override the default {@link UIComponentBase#processDecodes} processing
* to perform the following steps.
- If the
rendered
* property of this {@link UIComponent} is false, skip further
* processing. - Set the current
rowIndex to -1.
* - Call the
processDecodes() method of all facets of this
* {@link UIData}, in the order determined by a call to
* getFacets().keySet().iterator(). - Call the
*
processDecodes() method of all facets of the {@link
* UIColumn} children of this {@link 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 {@link UIColumn} child of this
* {@link 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 {@link FacesContext#renderResponse}
* and re-throw the exception.
*
* @param context {@link FacesContext} for the current request
*
* @throws NullPointerException if context is null
*/
public void processDecodes(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!isRendered()) {
return;
}
setDataModel(null); // Re-evaluate even with server-side state saving
if (null == saved || !keepSaved(context)) {
//noinspection CollectionWithoutInitialCapacity
saved = new HashMap(); // We don't need saved state here
}
iterate(context, PhaseId.APPLY_REQUEST_VALUES);
decode(context);
}
/**
* Override the default {@link UIComponentBase#processValidators}
* processing to perform the following steps.
- If the
*
rendered property of this {@link UIComponent} is
* false, skip further processing. - Set the current
*
rowIndex to -1. - Call the
processValidators()
* method of all facets of this {@link UIData}, in the order determined by a
* call to getFacets().keySet().iterator(). - Call the
*
processValidators() method of all facets of the {@link
* UIColumn} children of this {@link 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 {@link UIColumn} child of this
* {@link UIData} component, calling the processValidators()
* method for each such child.
- Set the current
*
rowIndex to -1.
*
* @param context {@link FacesContext} for the current request
*
* @throws NullPointerException if context is null
*/
public void processValidators(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!isRendered()) {
return;
}
if (isNestedWithinUIData()) {
setDataModel(null);
}
iterate(context, PhaseId.PROCESS_VALIDATIONS);
// This is not a EditableValueHolder, so no further processing is required
}
/**
* Override the default {@link UIComponentBase#processUpdates}
* processing to perform the following steps.
*
* - If the
rendered property of this {@link UIComponent}
* is false, skip further processing.
* - Set the current
rowIndex to -1.
* - Call the
processUpdates() method of all facets
* of this {@link UIData}, in the order determined
* by a call to getFacets().keySet().iterator().
* - Call the
processUpdates() method of all facets
* of the {@link UIColumn} children of this {@link 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 {@link UIColumn}
* child of this {@link UIData} component, calling the
* processUpdates() method for each such child.
*
* - Set the current
rowIndex to -1.
*
*
* @param context {@link FacesContext} for the current request
*
* @throws NullPointerException if context is null
*/
public void processUpdates(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!isRendered()) {
return;
}
if (isNestedWithinUIData()) {
setDataModel(null);
}
iterate(context, PhaseId.UPDATE_MODEL_VALUES);
// This is not a EditableValueHolder, so no further processing is required
}
// --------------------------------------------------------- Protected Methods
/**
* Return the internal {@link DataModel} object representing the data
* objects that we will iterate over in this component's rendering.
*
* If the model has been cached by a previous call to {@link
* #setDataModel}, return it. Otherwise call {@link #getValue}. If the
* result is null, create an empty {@link ListDataModel} and return it. If
* the result is an instance of {@link DataModel}, return it. Otherwise,
* adapt the result as described in {@link #getValue} and return it.
*/
protected DataModel getDataModel() {
// Return any previously cached DataModel instance
if (this.model != null) {
return (model);
}
// Synthesize a DataModel around our current value if possible
Object current = getValue();
if (current == null) {
setDataModel(new ListDataModel(Collections.EMPTY_LIST));
} else if (current instanceof DataModel) {
setDataModel((DataModel) current);
} else if (current instanceof List) {
setDataModel(new ListDataModel((List) current));
} else if (Object[].class.isAssignableFrom(current.getClass())) {
setDataModel(new ArrayDataModel((Object[]) current));
} else if (current instanceof ResultSet) {
setDataModel(new ResultSetDataModel((ResultSet) current));
} else if (current instanceof Result) {
setDataModel(new ResultDataModel((Result) current));
} else {
setDataModel(new ScalarDataModel(current));
}
return (model);
}
/**
* Set the internal DataModel. This UIData instance must
* use the given {@link DataModel} as its internal value representation from
* now until the next call to setDataModel. If the given
* DataModel is null, the internal
* DataModel must be reset in a manner so that the next call to
* {@link #getDataModel} causes lazy instantion of a newly refreshed
* DataModel.
*
* Subclasses might call this method if they either want to restore the
* internal DataModel during the Restore View phase or
* if they want to explicitly refresh the current DataModel for
* the Render Response phase.
*
* @param dataModel the new DataModel or null to
* cause the model to be refreshed.
*/
protected void setDataModel(DataModel dataModel) {
this.model = dataModel;
}
// ---------------------------------------------------- Private Methods
/**
* Perform the appropriate phase-specific processing and per-row
* iteration for the specified phase, as follows:
*
* - Set the
rowIndex property to -1, and process the facets
* of this {@link UIData} component exactly once.
* - Set the
rowIndex property to -1, and process the facets
* of the {@link UIColumn} children of this {@link UIData} component
* exactly once.
* - Iterate over the relevant rows, based on the
first
* and row properties, and process the children
* of the {@link UIColumn} children of this {@link UIData} component
* once per row.
*
*
* @param context {@link FacesContext} for the current request
* @param phaseId {@link PhaseId} of the phase we are currently running
*/
private void iterate(FacesContext context, PhaseId phaseId) {
// Process each facet of this component exactly once
setRowIndex(-1);
if (getFacetCount() > 0) {
for (UIComponent facet : getFacets().values()) {
if (phaseId == PhaseId.APPLY_REQUEST_VALUES) {
facet.processDecodes(context);
} else if (phaseId == PhaseId.PROCESS_VALIDATIONS) {
facet.processValidators(context);
} else if (phaseId == PhaseId.UPDATE_MODEL_VALUES) {
facet.processUpdates(context);
} else {
throw new IllegalArgumentException();
}
}
}
// Process each facet of our child UIColumn components exactly once
setRowIndex(-1);
if (getChildCount() > 0) {
for (UIComponent column : getChildren()) {
if (!(column instanceof UIColumn) || !column.isRendered()) {
continue;
}
if (column.getFacetCount() > 0) {
for (UIComponent columnFacet : column.getFacets().values()) {
if (phaseId == PhaseId.APPLY_REQUEST_VALUES) {
columnFacet.processDecodes(context);
} else if (phaseId == PhaseId.PROCESS_VALIDATIONS) {
columnFacet.processValidators(context);
} else if (phaseId == PhaseId.UPDATE_MODEL_VALUES) {
columnFacet.processUpdates(context);
} else {
throw new IllegalArgumentException();
}
}
}
}
}
// Iterate over our UIColumn children, once per row
int processed = 0;
int rowIndex = getFirst() - 1;
int rows = getRows();
while (true) {
// Have we processed the requested number of rows?
if ((rows > 0) && (++processed > rows)) {
break;
}
// Expose the current row in the specified request attribute
setRowIndex(++rowIndex);
if (!isRowAvailable()) {
break; // Scrolled past the last row
}
// Perform phase-specific processing as required
// on the *children* of the UIColumn (facets have
// been done a single time with rowIndex=-1 already)
if (getChildCount() > 0) {
for (UIComponent kid : getChildren()) {
if (!(kid instanceof UIColumn) || !kid.isRendered()) {
continue;
}
if (kid.getChildCount() > 0) {
for (UIComponent grandkid : kid.getChildren()) {
if (!grandkid.isRendered()) {
continue;
}
if (phaseId == PhaseId.APPLY_REQUEST_VALUES) {
grandkid.processDecodes(context);
} else if (phaseId == PhaseId.PROCESS_VALIDATIONS) {
grandkid.processValidators(context);
} else if (phaseId == PhaseId.UPDATE_MODEL_VALUES) {
grandkid.processUpdates(context);
} else {
throw new IllegalArgumentException();
}
}
}
}
}
}
// Clean up after ourselves
setRowIndex(-1);
}
/**
* Return true if we need to keep the saved
* per-child state information. This will be the case if any of the
* following are true:
*
*
*
* - there are messages queued with severity ERROR or FATAL.
*
* - this
UIData instance is nested inside of another
* UIData instance
*
*
*
* @param context {@link FacesContext} for the current request
*/
private boolean keepSaved(FacesContext context) {
return (contextHasErrorMessages(context) || isNestedWithinUIData());
}
private Boolean isNestedWithinUIData() {
if (isNested == null) {
UIComponent parent = this;
while (null != (parent = parent.getParent())) {
if (parent instanceof UIData) {
isNested = Boolean.TRUE;
break;
}
}
if (isNested == null) {
isNested = Boolean.FALSE;
}
return isNested;
} else {
return isNested;
}
}
private boolean contextHasErrorMessages(FacesContext context) {
FacesMessage.Severity sev = context.getMaximumSeverity();
return (sev != null && (FacesMessage.SEVERITY_ERROR.compareTo(sev) >= 0));
}
/**
* Restore state information for all descendant components, as described
* for setRowIndex().
*/
private void restoreDescendantState() {
FacesContext context = getFacesContext();
if (getChildCount() > 0) {
for (UIComponent kid : getChildren()) {
if (kid instanceof UIColumn) {
restoreDescendantState(kid, context);
}
}
}
}
/**
* Restore state information for the specified component and its
* descendants.
*
* @param component Component for which to restore state information
* @param context {@link FacesContext} for the current request
*/
private void restoreDescendantState(UIComponent component,
FacesContext context) {
// Reset the client identifier for this component
String id = component.getId();
component.setId(id); // Forces client id to be reset
// Restore state for this component (if it is a EditableValueHolder)
if (component instanceof EditableValueHolder) {
EditableValueHolder input = (EditableValueHolder) component;
String clientId = component.getClientId(context);
SavedState state = saved.get(clientId);
if (state == null) {
state = new SavedState();
}
input.setValue(state.getValue());
input.setValid(state.isValid());
input.setSubmittedValue(state.getSubmittedValue());
// This *must* be set after the call to setValue(), since
// calling setValue() always resets "localValueSet" to true.
input.setLocalValueSet(state.isLocalValueSet());
}
// Restore state for children of this component
if (component.getChildCount() > 0) {
for (UIComponent kid : component.getChildren()) {
restoreDescendantState(kid, context);
}
}
// Restore state for facets of this component
if (component.getFacetCount() > 0) {
for (UIComponent facet : component.getFacets().values()) {
restoreDescendantState(facet, context);
}
}
}
/**
* Save state information for all descendant components, as described for
* setRowIndex().
*/
private void saveDescendantState() {
FacesContext context = getFacesContext();
if (getChildCount() > 0) {
for (UIComponent kid : getChildren()) {
if (kid instanceof UIColumn) {
saveDescendantState(kid, context);
}
}
}
}
/**
* Save state information for the specified component and its
* descendants.
*
* @param component Component for which to save state information
* @param context {@link FacesContext} for the current request
*/
private void saveDescendantState(UIComponent component,
FacesContext context) {
// Save state for this component (if it is a EditableValueHolder)
if (component instanceof EditableValueHolder) {
EditableValueHolder input = (EditableValueHolder) component;
String clientId = component.getClientId(context);
SavedState state = saved.get(clientId);
if (state == null) {
state = new SavedState();
saved.put(clientId, state);
}
state.setValue(input.getLocalValue());
state.setValid(input.isValid());
state.setSubmittedValue(input.getSubmittedValue());
state.setLocalValueSet(input.isLocalValueSet());
}
// Save state for children of this component
if (component.getChildCount() > 0) {
for (UIComponent uiComponent : component.getChildren()) {
saveDescendantState(uiComponent, context);
}
}
// Save state for facets of this component
if (component.getFacetCount() > 0) {
for (UIComponent facet : component.getFacets().values()) {
saveDescendantState(facet, context);
}
}
}
}
// ------------------------------------------------------------- Private Classes
// Private class to represent saved state information
@SuppressWarnings({"SerializableHasSerializationMethods",
"NonSerializableFieldInSerializableClass"})
class SavedState implements Serializable {
private static final long serialVersionUID = 2920252657338389849L;
private Object submittedValue;
Object getSubmittedValue() {
return (this.submittedValue);
}
void setSubmittedValue(Object submittedValue) {
this.submittedValue = submittedValue;
}
private boolean valid = true;
boolean isValid() {
return (this.valid);
}
void setValid(boolean valid) {
this.valid = valid;
}
private Object value;
Object getValue() {
return (this.value);
}
public void setValue(Object value) {
this.value = value;
}
private boolean localValueSet;
boolean isLocalValueSet() {
return (this.localValueSet);
}
public void setLocalValueSet(boolean localValueSet) {
this.localValueSet = localValueSet;
}
public String toString() {
return ("submittedValue: " + submittedValue +
" value: " + value +
" localValueSet: " + localValueSet);
}
}
// Private class to wrap an event with a row index
class WrapperEvent extends FacesEvent {
public WrapperEvent(UIComponent component, FacesEvent event, int rowIndex) {
super(component);
this.event = event;
this.rowIndex = rowIndex;
}
private FacesEvent event = null;
private int rowIndex = -1;
public FacesEvent getFacesEvent() {
return (this.event);
}
public int getRowIndex() {
return (this.rowIndex);
}
public PhaseId getPhaseId() {
return (this.event.getPhaseId());
}
public void setPhaseId(PhaseId phaseId) {
this.event.setPhaseId(phaseId);
}
public boolean isAppropriateListener(FacesListener listener) {
return (false);
}
public void processListener(FacesListener listener) {
throw new IllegalStateException();
}
}