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package com.sun.faces.application.view;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.FactoryFinder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
import javax.faces.render.ResponseStateManager;
import com.sun.faces.context.StateContext;
import com.sun.faces.renderkit.RenderKitUtils;
import com.sun.faces.util.ComponentStruct;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.MessageUtils;
import com.sun.faces.util.Util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.io.IOException;
import java.util.Collections;
import javax.faces.application.StateManager;
import javax.faces.component.ContextCallback;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitHint;
import javax.faces.view.StateManagementStrategy;
import javax.faces.FacesException;
import javax.faces.application.Application;
import javax.faces.view.ViewDeclarationLanguage;
import javax.faces.view.ViewDeclarationLanguageFactory;
/**
* <p>
* A <code>StateManager</code> implementation to meet the requirements
* of the specification.
* </p>
*
* <p>
* For those who had compile dependencies on this class, we're sorry for any
* inconvenience, but this had to be re-worked as the version you depended on
* was incorrectly implemented.
* </p>
*/
public class StateManagementStrategyImpl extends StateManagementStrategy {
private static final Logger LOGGER = FacesLogger.APPLICATION_VIEW.getLogger();
private final ViewDeclarationLanguageFactory vdlFactory;
private static final String CLIENTIDS_TO_REMOVE_NAME =
"com.sun.faces.application.view.CLIENTIDS_TO_REMOVE";
private static final String CLIENTIDS_TO_ADD_NAME =
"com.sun.faces.application.view.CLIENTIDS_TO_ADD";
private static String SKIP_ITERATION_HINT =
"javax.faces.visit.SKIP_ITERATION";
// ------------------------------------------------------------ Constructors
/**
* Create a new <code>StateManagerImpl</code> instance.
*/
public StateManagementStrategyImpl() {
vdlFactory = (ViewDeclarationLanguageFactory)
FactoryFinder.getFactory(FactoryFinder.VIEW_DECLARATION_LANGUAGE_FACTORY);
}
// ----------------------------------------------- Methods from StateManager
/**
* @see {@link javax.faces.application.StateManager#saveView(javax.faces.context.FacesContext))
*/
@Override
public Object saveView(FacesContext context) {
if (context == null) {
return null;
}
// irrespective of method to save the tree, if the root is transient
// no state information needs to be persisted.
UIViewRoot viewRoot = context.getViewRoot();
if (viewRoot.isTransient()) {
return null;
}
// honor the requirement to check for id uniqueness
Util.checkIdUniqueness(context,
viewRoot,
new HashSet<String>(viewRoot.getChildCount() << 1));
final Map<String,Object> stateMap = new HashMap<String,Object>();
final StateContext stateContext = StateContext.getStateContext(context);
// PENDING: This is included for those component frameworks that don't utilize the
// new VisitHint(s) yet - but still wish to know that they should be non-iterating
// during state saving. It should be removed at some point.
context.getAttributes().put(SKIP_ITERATION_HINT, true);
Set<VisitHint> hints = EnumSet.of(VisitHint.SKIP_ITERATION);
VisitContext visitContext = VisitContext.createVisitContext(context, null, hints);
final FacesContext finalContext = context;
try {
viewRoot.visitTree(visitContext, new VisitCallback() {
public VisitResult visit(VisitContext context, UIComponent target) {
VisitResult result = VisitResult.ACCEPT;
Object stateObj;
if (!target.isTransient()) {
if (stateContext.componentAddedDynamically(target)) {
stateObj = new StateHolderSaver(finalContext, target);
Map<String, ComponentStruct> dynamicAdds = stateContext.getDynamicAdds();
assert(null != dynamicAdds);
String clientId = target.getClientId(finalContext);
if (!dynamicAdds.containsKey(clientId)) {
ComponentStruct toAdd = new ComponentStruct();
toAdd.absorbComponent(finalContext, target);
dynamicAdds.put(clientId, toAdd);
}
} else {
stateObj = target.saveState(context.getFacesContext());
}
if (null != stateObj) {
stateMap.put(target.getClientId(context.getFacesContext()), stateObj);
}
} else {
return result;
}
return result;
}
});
} finally {
// PENDING: This is included for those component frameworks that don't utilize the
// new VisitHint(s) yet - but still wish to know that they should be non-iterating
// during state saving. It should be removed at some point.
context.getAttributes().remove(SKIP_ITERATION_HINT);
}
// handle dynamic adds/removes
List<String> removeList = stateContext.getDynamicRemoves();
if (null != removeList && !removeList.isEmpty()) {
stateMap.put(CLIENTIDS_TO_REMOVE_NAME, removeList);
}
Map<String, ComponentStruct> addList = stateContext.getDynamicAdds();
if (null != addList && !addList.isEmpty()) {
List<Object> savedAddList = new ArrayList<Object>(addList.size());
for (ComponentStruct s : addList.values()) {
savedAddList.add(s.saveState(context));
}
stateMap.put(CLIENTIDS_TO_ADD_NAME, savedAddList.toArray());
}
//return stateMap;
return new Object[] { null, stateMap };
}
/**
* @see {@link StateManager#restoreView(javax.faces.context.FacesContext, String, String)}
*/
@Override
public UIViewRoot restoreView(FacesContext context,
String viewId,
String renderKitId) {
ResponseStateManager rsm =
RenderKitUtils.getResponseStateManager(context, renderKitId);
boolean processingEvents = context.isProcessingEvents();
// Build the tree to initial state
UIViewRoot viewRoot;
try {
ViewDeclarationLanguage vdl = vdlFactory.getViewDeclarationLanguage(viewId);
viewRoot = vdl.getViewMetadata(context, viewId).createMetadataView(context);
context.setViewRoot(viewRoot);
context.setProcessingEvents(true);
vdl.buildView(context, viewRoot);
} catch (IOException ioe) {
throw new FacesException(ioe);
}
Object[] rawState = (Object[]) rsm.getState(context, viewId);
if (rawState == null) {
return null; // trigger a ViewExpiredException
}
//noinspection unchecked
final Map<String, Object> state = (Map<String,Object>) rawState[1];
final StateContext stateContext = StateContext.getStateContext(context);
if (null != state) {
try {
stateContext.setTrackViewModifications(false);
final Application app = context.getApplication();
// We need to clone the tree, otherwise we run the risk
// of being left in a state where the restored
// UIComponent instances are in the session instead
// of the TreeNode instances. This is a problem
// for servers that persist session data since
// UIComponent instances are not serializable.
// PENDING: This is included for those component frameworks that don't utilize the
// new VisitHint(s) yet - but still wish to know that they should be non-iterating
// during state saving. It should be removed at some point.
context.getAttributes().put(SKIP_ITERATION_HINT, true);
Set<VisitHint> hints = EnumSet.of(VisitHint.SKIP_ITERATION, VisitHint.EXECUTE_LIFECYCLE);
VisitContext visitContext = VisitContext.createVisitContext(context, null, hints);
viewRoot.visitTree(visitContext, new VisitCallback() {
public VisitResult visit(VisitContext context, UIComponent target) {
VisitResult result = VisitResult.ACCEPT;
String cid = target.getClientId(context.getFacesContext());
Object stateObj = state.get(cid);
if (stateObj != null && !stateContext.componentAddedDynamically(target)) {
boolean restoreStateNow = true;
if (stateObj instanceof StateHolderSaver) {
restoreStateNow = !((StateHolderSaver)stateObj).componentAddedDynamically();
}
if (restoreStateNow) {
try {
target.restoreState(context.getFacesContext(),
stateObj);
} catch (Exception e) {
String msg =
MessageUtils.getExceptionMessageString(
MessageUtils.PARTIAL_STATE_ERROR_RESTORING_ID,
cid,
e.toString());
throw new FacesException(msg, e);
}
}
}
return result;
}
});
// Handle dynamic add/removes
//noinspection unchecked
List<String> removeList = (List<String>) state.get(CLIENTIDS_TO_REMOVE_NAME);
if (null != removeList && !removeList.isEmpty()) {
for (String cur : removeList) {
boolean trackMods = stateContext.trackViewModifications();
if (trackMods) {
stateContext.setTrackViewModifications(false);
}
viewRoot.invokeOnComponent(context, cur, new ContextCallback() {
public void invokeContextCallback(FacesContext context, UIComponent target) {
UIComponent parent = target.getParent();
if (null != parent) {
parent.getChildren().remove(target);
}
}
});
if (trackMods) {
stateContext.setTrackViewModifications(true);
}
}
}
Object restoredAddList[] = (Object[]) state.get(CLIENTIDS_TO_ADD_NAME);
if (restoredAddList != null && restoredAddList.length > 0) {
// Restore the list of added components
List<ComponentStruct> addList = new ArrayList<ComponentStruct>(restoredAddList.length);
for (Object aRestoredAddList : restoredAddList) {
ComponentStruct cur = new ComponentStruct();
cur.restoreState(context, aRestoredAddList);
addList.add(cur);
}
// restore the components themselves
for (ComponentStruct cur : addList) {
final ComponentStruct finalCur = cur;
// Find the parent
viewRoot.visitTree(visitContext, new VisitCallback() {
public VisitResult visit(VisitContext context, UIComponent target) {
VisitResult result = VisitResult.ACCEPT;
if (finalCur.parentClientId.equals(target.getClientId(context.getFacesContext()))) {
StateHolderSaver saver = (StateHolderSaver) state.get(finalCur.clientId);
UIComponent toAdd = (UIComponent) saver.restore(context.getFacesContext());
int idx = finalCur.indexOfChildInParent;
if (idx == -1) {
// add facet to the parent
target.getFacets().put(finalCur.facetName, toAdd);
} else {
// add the child to the parent at correct index
try {
target.getChildren().add(finalCur.indexOfChildInParent, toAdd);
} catch (IndexOutOfBoundsException ioobe) {
// the indexing within the parent list is off during the restore.
// This is most likely due to a transient component added during
// RENDER_REPONSE phase.
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE,
"Unable to insert child with client ID {0} into parent with client ID {1} into list at index {2}.",
new Object[]{finalCur.clientId,
finalCur.parentClientId,
finalCur.indexOfChildInParent});
}
target.getChildren().add(toAdd);
}
}
}
return result;
}
});
}
}
} finally {
stateContext.setTrackViewModifications(true);
// PENDING: This is included for those component frameworks that don't utilize the
// new VisitHint(s) yet - but still wish to know that they should be non-iterating
// during state saving. It should be removed at some point.
context.getAttributes().remove(SKIP_ITERATION_HINT);
}
} else {
viewRoot = null;
}
context.setProcessingEvents(processingEvents);
return viewRoot;
}
// --------------------------------------------------------- Private Methods
}