Examples of com.sun.faces.context.StateContext$StatelessAddRemoveListener

com.sun.faces.context.StateContext
An AddRemoveListener that implements the new dynamic component strategy where no state is managed by the listener itself. Instead, we use expando attributes on the dynamic components (and their parents) to track/preserve the dynamic nature of these components.

        if (rawState == null) {
            return null;
        }


        final Map<String, Object> state = (Map<String, Object>) rawState[1];
        final StateContext stateContext = StateContext.getStateContext(context);


        if (state != null) {
            try {
                stateContext.setTrackViewModifications(false);


                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;
                    }
                });
                restoreDynamicActions(context, stateContext, state);
            } finally {
                stateContext.setTrackViewModifications(true);
                context.getAttributes().remove(SKIP_ITERATION_HINT);
            }
        } else {
            viewRoot = null;
        }

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        }


        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);


        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)) {
                            target.getAttributes().put(DYNAMIC_COMPONENT, new Integer(getProperChildIndex(target)));
                            stateObj = new StateHolderSaver(finalContext, target);
                        } else {
                            stateObj = target.saveState(context.getFacesContext());
                        }

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     * @param context the Faces context.
     * @param state the component state.
     */
    private void restoreComponentState(final FacesContext context, final HashMap<String, Object> state) {


        final StateContext stateContext = StateContext.getStateContext(context);
        final UIViewRoot viewRoot = context.getViewRoot();


        try {
            context.getAttributes().put(SKIP_ITERATION_HINT, true);
            Set<VisitHint> hints = EnumSet.of(VisitHint.SKIP_ITERATION);
            VisitContext visitContext = VisitContext.createVisitContext(context, null, hints);


            viewRoot.visitTree(visitContext, new VisitCallback() {


                public VisitResult visit(VisitContext visitContext, UIComponent component) {
                    VisitResult result = VisitResult.ACCEPT;


                    String cid = component.getClientId(context);
                    Object stateObj = state.get(cid);


                    if (stateObj != null && !stateContext.componentAddedDynamically(component)) {
                        boolean restoreStateNow = true;
                        if (stateObj instanceof StateHolderSaver) {
                            restoreStateNow = !((StateHolderSaver) stateObj).componentAddedDynamically();
                        }
                        if (restoreStateNow) {

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            /*
             * Are we adding =BACK= in a component that was not in the state,
             * because it was added by the initial buildView and removed by
             * another dynamic action?
             */
            StateContext stateContext = StateContext.getStateContext(context);
            if (child == null) {
                child = stateContext.getDynamicComponents().get(struct.clientId);
            }


            /*
             * Now if we have the child we are going to add it back in.
             */
            if (child != null) {
                if (struct.facetName != null) {
                    parent.getFacets().put(struct.facetName, child);
                } else {
                    int childIndex = -1;
                    if (child.getAttributes().containsKey(DYNAMIC_COMPONENT)) {
                        childIndex = (Integer) child.getAttributes().get(DYNAMIC_COMPONENT);
                    }
                    child.setId(struct.id);
                    if (childIndex >= parent.getChildCount() || childIndex == -1) {
                        parent.getChildren().add(child);
                    } else {
                        parent.getChildren().add(childIndex, child);
                    }
                    child.getClientId();
                }
                child.getAttributes().put(DYNAMIC_COMPONENT, child.getParent().getChildren().indexOf(child));
                stateContext.getDynamicComponents().put(struct.clientId, child);
            }
        }
    }

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            LOGGER.finest("FaceletFullStateManagementStrategy.restoreDynamicRemove");
        }


        UIComponent child = locateComponentByClientId(context, context.getViewRoot(), struct.clientId);
        if (child != null) {
            StateContext stateContext = StateContext.getStateContext(context);
            stateContext.getDynamicComponents().put(struct.clientId, child);
            UIComponent parent = child.getParent();
            parent.getChildren().remove(child);
        }
    }

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                result = restoreTree(context, renderKitId, ((Object[]) state[0]).clone());
                context.setViewRoot(result);
            }


            if (result != null) {
                StateContext stateContext = StateContext.getStateContext(context);
                stateContext.startTrackViewModifications(context, result);
                stateContext.setTrackViewModifications(false);


                try {
                    HashMap<String, Object> stateMap = (HashMap<String, Object>) state[1];
                    if (stateMap != null) {
                        /*
                         * Restore the component state.
                         */
                        restoreComponentState(context, stateMap);


                        /**
                         * Restore the dynamic actions.
                         */
                        restoreDynamicActions(context, stateContext, stateMap);
                    }
                } finally {
                    stateContext.setTrackViewModifications(true);
                }
            }
        }


        return result;

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     * @return the saved state.
     */
    private Object saveComponentState(FacesContext context) {


        final HashMap<String, Object> stateMap = new HashMap<String, Object>();
        final StateContext stateContext = StateContext.getStateContext(context);
        final UIViewRoot viewRoot = context.getViewRoot();
        final FacesContext finalContext = context;


        context.getAttributes().put(SKIP_ITERATION_HINT, true);
        Set<VisitHint> hints = EnumSet.of(VisitHint.SKIP_ITERATION);
        VisitContext visitContext = VisitContext.createVisitContext(context, null, hints);


        try {
            viewRoot.visitTree(visitContext, new VisitCallback() {


                public VisitResult visit(VisitContext context, UIComponent component) {
                    VisitResult result = VisitResult.ACCEPT;
                    Object stateObj;
                    if (!component.isTransient()) {
                        if (stateContext.componentAddedDynamically(component)) {
                            component.getAttributes().put(DYNAMIC_COMPONENT, new Integer(getProperChildIndex(component)));
                            stateObj = new StateHolderSaver(finalContext, component);
                        } else {
                            stateObj = component.saveState(finalContext);
                        }

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        Util.checkIdUniqueness(context, viewRoot, new HashSet<String>(viewRoot.getChildCount() << 1));


        /**
         * Save the dynamic actions.
         */
        StateContext stateContext = StateContext.getStateContext(context);
        saveDynamicActions(context, stateContext, viewRoot);


        /*
         * Save the component state.
         */

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    @Override
    public StateManagementStrategy getStateManagementStrategy(FacesContext context, String viewId) {
        StateManagementStrategy result;
        
        StateContext stateCtx = StateContext.getStateContext(context);
        if (stateCtx.isPartialStateSaving(context, viewId)) {
            result = new FaceletPartialStateManagementStrategy(context);
        } else {
            result = new FaceletFullStateManagementStrategy(context);
        }

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                throw new FacesException(ioe);
            }
        }


        UIViewRoot root = super.restoreView(context, viewId);        
        StateContext stateCtx = StateContext.getStateContext(context);
        stateCtx.startTrackViewModifications(context, root);
        
        return root;
    }

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