Examples of org.modeshape.jcr.cache.ChildReferences$Context

org.modeshape.jcr.cache.ChildReferences
The context in which the names are evaluated.

     * </ul>
     */
    public static void execute(final String uri, final Evaluator evaluator) {
        try {
            String documentURI = getCanonicalURI(uri);
            Context rootCtx = evaluator.newContext(null);
            Tracer trc = new Tracer();
            SCXML doc = SCXMLReader.read(new URL(documentURI));
            if (doc == null) {
                System.err.println("The SCXML document " + uri
                        + " can not be parsed!");
                System.exit(-1);
            }
            System.out.println(SCXMLWriter.write(doc));
            SCXMLExecutor exec = new SCXMLExecutor(evaluator, null, trc);
            EventDispatcher ed = new SimpleScheduler(exec);
            exec.setEventdispatcher(ed);
            exec.setStateMachine(doc);
            exec.addListener(doc, trc);
            exec.registerInvokerClass("scxml", SimpleSCXMLInvoker.class);
            exec.setRootContext(rootCtx);
            exec.go();
            BufferedReader br = new BufferedReader(new
                InputStreamReader(System.in));
            String event;
            while ((event = br.readLine()) != null) {
                event = event.trim();
                if (event.equalsIgnoreCase("help") || event.equals("?")) {
                    System.out.println("Enter a space-separated list of "
                        + "events");
                    System.out.println("To populate a variable in the "
                        + "current context, type \"name=value\"");
                    System.out.println("To quit, enter \"quit\"");
                    System.out.println("To reset state machine, enter "
                        + "\"reset\"");
                } else if (event.equalsIgnoreCase("quit")) {
                    break;
                } else if (event.equalsIgnoreCase("reset")) {
                    exec.reset();
                } else if (event.indexOf('=') != -1) {
                    int marker = event.indexOf('=');
                    String name = event.substring(0, marker);
                    String value = event.substring(marker + 1);
                    rootCtx.setLocal(name, value);
                    System.out.println("Set variable " + name + " to "
                        + value);
                } else if (event == null || event.trim().length() == 0
                           || event.equalsIgnoreCase("null")) {
                    TriggerEvent[] evts = {new TriggerEvent(null,

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        else if (!transition.isNoEventsTransition()) {
            return false;
        }
        if (transition.getCond() != null) {
            Boolean result = Boolean.FALSE;
            Context context = exctx.getScInstance().getContext(transition.getParent());
            context.setLocal(Context.NAMESPACES_KEY, transition.getNamespaces());
            try {
                if ((result = exctx.getEvaluator().evalCond(context, transition.getCond())) == null) {
                    result = Boolean.FALSE;
                    if (exctx.getAppLog().isDebugEnabled()) {
                        exctx.getAppLog().debug("Treating as false because the cond expression was evaluated as null: '"
                                + transition.getCond() + "'");
                    }
                }
            }
            catch (SCXMLExpressionException e) {
                exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
                exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, "Treating as false due to error: "
                        + e.getMessage(), transition);
            }
            finally {
                context.setLocal(Context.NAMESPACES_KEY, null);
            }
            return result;
        }
        return true;
    }

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     * @param scInstance the state machine instance holding the system context
     * @param event The event being stored
     * @param internal Flag indicating the event was received internally or externally
     */
    public void setSystemEventVariable(final SCInstance scInstance, final TriggerEvent event, boolean internal) {
        Context systemContext = scInstance.getSystemContext();
        EventVariable eventVar = null;
        if (event != null) {
            String eventType = internal ? EventVariable.TYPE_INTERNAL : EventVariable.TYPE_EXTERNAL;


            final int triggerEventType = event.getType();
            if (triggerEventType == TriggerEvent.ERROR_EVENT || triggerEventType == TriggerEvent.CHANGE_EVENT) {
                eventType = EventVariable.TYPE_PLATFORM;
            }


            // TODO: determine sendid, origin, originType and invokeid based on context later.
            eventVar = new EventVariable(event.getName(), eventType, null, null, null, null, event.getPayload());
        }
        systemContext.setLocal(SCXMLSystemContext.EVENT_KEY, eventVar);
    }

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        Evaluator eval = exctx.getEvaluator();
        for (TransitionalState ts : statesToInvoke) {
            if (ts.getInvokes().isEmpty()) {
                continue;
            }
            Context context = scInstance.getContext(ts);
            for (Invoke i : ts.getInvokes()) {
                String src = i.getSrc();
                if (src == null) {
                    String srcexpr = i.getSrcexpr();
                    Object srcObj;
                    try {
                        context.setLocal(Context.NAMESPACES_KEY, i.getNamespaces());
                        srcObj = eval.eval(context, srcexpr);
                        context.setLocal(Context.NAMESPACES_KEY, null);
                        src = String.valueOf(srcObj);
                    } catch (SCXMLExpressionException see) {
                        exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
                        exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, see.getMessage(), i);
                    }
                }
                String source = src;
                PathResolver pr = i.getPathResolver();
                if (pr != null) {
                    source = i.getPathResolver().resolvePath(src);
                }
                Invoker inv;
                try {
                    inv = exctx.newInvoker(i.getType());
                } catch (InvokerException ie) {
                    exctx.getInternalIOProcessor().addEvent(new TriggerEvent("failed.invoke."+ts.getId(), TriggerEvent.ERROR_EVENT));
                    continue;
                }
                List<Param> params = i.params();
                Map<String, Object> args = new HashMap<String, Object>();
                for (Param p : params) {
                    String argExpr = p.getExpr();
                    Object argValue = null;
                    context.setLocal(Context.NAMESPACES_KEY, p.getNamespaces());
                    // Do we have an "expr" attribute?
                    if (argExpr != null && argExpr.trim().length() > 0) {
                        try {
                            argValue = eval.eval(context, argExpr);
                        } catch (SCXMLExpressionException see) {
                            exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
                            exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, see.getMessage(), i);
                        }
                    } else {
                        // No. Does value of "name" attribute refer to a valid
                        // location in the data model?
                        try {
                            argValue = eval.evalLocation(context, p.getName());
                            if (argValue == null) {
                                // Generate error, 4.3.1 in WD-scxml-20080516
                                exctx.getInternalIOProcessor().addEvent(new TriggerEvent(ts.getId() + ERR_ILLEGAL_ALLOC, TriggerEvent.ERROR_EVENT));
                            }
                        } catch (SCXMLExpressionException see) {
                            exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
                            exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, see.getMessage(), i);
                        }
                    }
                    context.setLocal(Context.NAMESPACES_KEY, null);
                    args.put(p.getName(), argValue);
                }
                String invokeId = exctx.setInvoker(i, inv);
                inv.setInvokeId(invokeId);
                inv.setParentIOProcessor(exctx.getExternalIOProcessor());

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                assert appendedOrRenamedChildrenByName.isEmpty() == false;


                // look at the information that was already persisted to determine whether some other thread has already
                // created a child with the same name
                CachedNode persistentNode = persistentNodeCache.getNode(modifiedNode.getKey());
                final ChildReferences persistedChildReferences = persistentNode.getChildReferences(persistentNodeCache);
                final SiblingCounter siblingCounter = SiblingCounter.create(persistedChildReferences);


                // process appended/renamed children
                for (Name childName : appendedOrRenamedChildrenByName.keySet()) {
                    int existingChildrenWithSameName = persistedChildReferences.getChildCount(childName);
                    if (existingChildrenWithSameName == 0) {
                        continue;
                    }
                    if (existingChildrenWithSameName == 1) {
                        // See if the existing same-name sibling is removed ...
                        NodeKey persistedChildKey = persistedChildReferences.getChild(childName).getKey();
                        if (removedChildren.contains(persistedChildKey)) {
                            // the sole existing child with this name is being removed, so we can ignore it ...
                            // existingChildrenWithSameName = 0;
                            continue;
                        }
                    }


                    // There is at least one persisted child with the same name, and we're adding a new child
                    // or renaming an existing child to this name. Therefore, we have to find a child node definition
                    // that allows SNS. Look for one ignoring the child node type (this is faster than finding the
                    // child node primary types) ...
                    NodeDefinitionSet childDefns = nodeTypeCapabilities.findChildNodeDefinitions(primaryType, mixinTypes);
                    JcrNodeDefinition childNodeDefinition = childDefns.findBestDefinitionForChild(childName, null, true,
                                                                                                  siblingCounter);
                    if (childNodeDefinition != null) {
                        // found the one child node definition that applies, so it's okay ...
                        continue;
                    }


                    // We were NOT able to find a definition that allows SNS for this name, but we need to make sure that
                    // the node that already exists (persisted) isn't the one that's being changed
                    NodeKey persistedChildKey = persistedChildReferences.getChild(childName).getKey();
                    if (appendedChildren.containsKey(persistedChildKey) || renamedChildren.containsKey(persistedChildKey)) {
                        // The persisted node is being changed, so it's okay ...
                        continue;
                    }

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    private static int countAllNodesBelow( NodeKey nodeKey,
                                           NodeCache cache ) throws RepositoryException {
        CachedNode node = cache.getNode(nodeKey);
        if (!node.isQueryable(cache)) return 0;
        int result = 1;
        ChildReferences childReferences = node.getChildReferences(cache);
        for (Iterator<NodeKey> nodeKeyIterator = childReferences.getAllKeys(); nodeKeyIterator.hasNext();) {
            NodeKey childKey = nodeKeyIterator.next();
            result += countAllNodesBelow(childKey, cache);
        }
        return result;
    }

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        return ref != null ? session().node(ref.getKey(), null, key()) : null;
    }


    @Override
    public NodeIterator getNodes() throws RepositoryException {
        ChildReferences childReferences = node().getChildReferences(sessionCache());
        if (childReferences.isEmpty()) return JcrEmptyNodeIterator.INSTANCE;
        return new JcrChildNodeIterator(new ChildNodeResolver(session, key()), childReferences.iterator());
    }

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        if (childReferences.isEmpty()) return JcrEmptyNodeIterator.INSTANCE;
        return new JcrChildNodeIterator(new ChildNodeResolver(session, key()), childReferences.iterator());
    }


    protected NodeIterator getNodesInternal() throws RepositoryException {
        ChildReferences childReferences = node().getChildReferences(sessionCache());
        if (childReferences.isEmpty()) return JcrEmptyNodeIterator.INSTANCE;
        return new JcrChildNodeIterator(new ChildNodeResolver(session, key(), false), childReferences);
    }

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        }


        session.checkPermission(this, ModeShapePermissions.ADD_NODE);


        SessionCache cache = session.cache();
        ChildReferences childRefs = node().getChildReferences(cache);
        ChildReference srcRef = childRefs.getChild(srcPath.getLastSegment());
        if (srcRef == null) {
            String workspaceName = workspaceName();
            throw new ItemNotFoundException(JcrI18n.pathNotFound.text(srcChildRelPath, workspaceName));
        }


        NodeKey destKey = null;
        if (destChildRelPath != null) {
            Path destPath = session.pathFactory().create(destChildRelPath);
            if (destPath.isAbsolute() || destPath.size() != 1) {
                throw new ItemNotFoundException(JcrI18n.invalidPathParameter.text(destChildRelPath, "destChildRelPath"));
            }


            if (srcPath.isSameAs(destPath)) {
                return;
            }


            ChildReference destRef = childRefs.getChild(destPath.getLastSegment());
            if (destRef == null) {
                String workspaceName = workspaceName();
                throw new ItemNotFoundException(JcrI18n.pathNotFound.text(destChildRelPath, workspaceName));
            }
            destKey = destRef.getKey();

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                }
            }
        }


        if (nodeType.hasChildNodeDefinitions()) {
            ChildReferences refs = null;
            for (JcrNodeDefinition nodeDefn : nodeType.allChildNodeDefinitions()) {
                if (nodeDefn.isAutoCreated() && !nodeDefn.isProtected()) {
                    Name nodeName = nodeDefn.getInternalName();
                    if (refs == null) refs = node.getChildReferences(cache);
                    if (refs.getChildCount(nodeName) == 0) {
                        JcrNodeType defaultPrimaryType = nodeDefn.getDefaultPrimaryType();
                        assert defaultPrimaryType != null;
                        Name primaryType = defaultPrimaryType.getInternalName();
                        addChildNode(nodeName, primaryType, null, false, false);
                    }

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