Examples of org.jboss.dna.graph.request.ReadNodeRequest

org.jboss.dna.graph.request.ReadNodeRequest
Instruction to read the properties and children of the node at the specifed location.

                        continue;
                    }
                    while (child != null && child.isProxy()) {
                        if (!children.isEmpty()) {
                            // Take any children so far and simply record a ReadNodeRequest with results ...
                            ReadNodeRequest placeholderRequest = new ReadNodeRequest(placeholder.location(),
                                                                                     request.inWorkspace());
                            placeholderRequest.addChildren(children);
                            if (firstRequest) {
                                firstRequest = false;
                                placeholderRequest.addProperties(placeholder.properties().values());
                            }
                            placeholderRequest.setActualLocationOfNode(placeholder.location());
                            federatedRequest.add(placeholderRequest, true, true, null);
                            children = new LinkedList<Location>();
                        }
                        // Now issue a VerifyNodeExistsRequest for the child.
                        // We'll mix these into the federated request along with the ReadNodeRequests ...
                        ProxyNode proxy = child.asProxy();
                        VerifyNodeExistsRequest verifyRequest = new VerifyNodeExistsRequest(proxy.location(),
                                                                                            proxy.workspaceName());
                        federatedRequest.add(verifyRequest, proxy.isSameLocationAsOriginal(), false, proxy.projection());
                        child = child.next();
                    }
                }
                if (!children.isEmpty() || firstRequest) {
                    // Submit the children so far ...
                    ReadNodeRequest placeholderRequest = new ReadNodeRequest(placeholder.location(), request.inWorkspace());
                    placeholderRequest.addChildren(children);
                    if (firstRequest) {
                        firstRequest = false;
                        placeholderRequest.addProperties(placeholder.properties().values());
                    }
                    placeholderRequest.setActualLocationOfNode(placeholder.location());
                    federatedRequest.add(placeholderRequest, true, true, null);
                }
            } else if (projectedNode.isProxy()) {
                ProxyNode proxy = projectedNode.asProxy();
                // Create and submit a request for the projection ...
                ReadNodeRequest pushDownRequest = new ReadNodeRequest(proxy.location(), proxy.workspaceName());
                federatedRequest.add(pushDownRequest, proxy.isSameLocationAsOriginal(), false, proxy.projection());
            }
            projectedNode = projectedNode.next();
        }
        // Submit for processing ...

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        assert maxDepth > 0;
        while (projectedNode != null) {
            if (projectedNode.isPlaceholder()) {
                PlaceholderNode placeholder = projectedNode.asPlaceholder();
                // Create a request and set the results ...
                ReadNodeRequest placeholderRequest = new ReadNodeRequest(placeholder.location(), workspace.getName());
                List<Location> children = new ArrayList<Location>(placeholder.children().size());
                for (ProjectedNode child : placeholder.children()) {
                    if (child instanceof ProxyNode) {
                        ProxyNode proxy = (ProxyNode)child;
                        children.add(proxy.federatedLocation()); // the ProxyNodes will have only a path!
                        proxy.federatedLocation();
                    } else {
                        assert child instanceof PlaceholderNode;
                        children.add(child.location());
                    }
                }
                placeholderRequest.addChildren(children);
                placeholderRequest.addProperties(placeholder.properties().values());
                placeholderRequest.setActualLocationOfNode(placeholder.location());
                federatedRequest.add(placeholderRequest, true, true, null);
                if (maxDepth > 1) {
                    // For each child of the placeholder node ...
                    for (ProjectedNode child : placeholder.children()) {
                        // Call recursively, but reduce the max depth

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                        if (projectedNode != null) {
                            if (projectedNode.isProxy()) {
                                ProxyNode proxy = projectedNode.asProxy();


                                // We know that the parent is a placeholder, so this proxy node must exist, so do a read ...
                                ReadNodeRequest pushDownRequest = new ReadNodeRequest(proxy.location(), proxy.workspaceName());
                                federatedRequest.add(pushDownRequest, proxy.isSameLocationAsOriginal(), false, proxy.projection());


                                // Submit the requests for processing and then STOP ...
                                submit(federatedRequest);
                                return;

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     * 
     * @see org.jboss.dna.graph.request.processor.RequestProcessor#process(org.jboss.dna.graph.request.ReadNodeRequest)
     */
    @Override
    public void process( ReadNodeRequest request ) {
        ReadNodeRequest source = (ReadNodeRequest)federatedRequest.getFirstProjectedRequest().getRequest();
        if (checkErrorOrCancel(request, source)) return;
        request.setActualLocationOfNode(source.getActualLocationOfNode());
        for (Location childInSource : source.getChildren()) {
            request.addChild(childInSource);
        }
        for (Property propertyInSource : source.getProperties()) {
            request.addProperties(propertyInSource);
        }
        request.setCachePolicy(getDefaultCachePolicy());
        setCacheableInfo(request, source.getCachePolicy());
    }

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                if (children != null) request.setChildren(node, children);
                Map<Name, Property> props = readSource.getPropertiesFor(node);
                if (props != null) request.setProperties(node, props.values());
            }
        } else if (source instanceof ReadNodeRequest) {
            ReadNodeRequest readSource = (ReadNodeRequest)source;
            request.setActualLocationOfNode(readSource.getActualLocationOfNode());
            Location parent = readSource.getActualLocationOfNode();
            request.setChildren(parent, readSource.getChildren());
            request.setProperties(parent, readSource.getPropertiesByName().values());
        }
        request.setCachePolicy(getDefaultCachePolicy());
        setCacheableInfo(request, source.getCachePolicy());
    }

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                                                                            childSnsIndexes,
                                                                            projection);
                request.addChild(childInRepos);
                if (federatedPath == null) federatedPath = childInRepos.getPath().getParent();
            } else {
                ReadNodeRequest readFromSource = (ReadNodeRequest)sourceRequest;
                Location sourceLocation = readFromSource.getActualLocationOfNode();
                if (sourceLocation.hasIdProperties()) {
                    // Accumulate the identification properties ...
                    for (Property propertyInSource : sourceLocation.getIdProperties()) {
                        Name name = propertyInSource.getName();
                        Property existing = actualLocation.getIdProperty(name);
                        if (existing != null) {
                            // Merge the property values ...
                            propertyInSource = merge(existing, propertyInSource, propertyFactory, true);
                        }
                        actualLocation = actualLocation.with(propertyInSource);
                    }
                }


                // Make sure we have an actual location ...
                actualLocation = determineActualLocation(actualLocation, sourceLocation, projection);
                if (federatedPath == null) federatedPath = actualLocation.getPath();


                // Add all the children from the source ...
                for (Location childInSource : readFromSource.getChildren()) {
                    request.addChild(getChildLocationWithCorrectSnsIndex(childInSource,
                                                                         federatedPath,
                                                                         childSnsIndexes,
                                                                         projection));
                }


                // Add all the properties ...
                for (Property propertyInSource : readFromSource.getProperties()) {
                    Name name = propertyInSource.getName();
                    Property existing = properties.get(name);
                    if (existing != null) {
                        // Merge the property values ...
                        propertyInSource = merge(existing, propertyInSource, propertyFactory, true);
                    }
                    properties.put(name, propertyInSource);
                }
                setCacheableInfo(request, readFromSource.getCachePolicy());
            }
            projectedRequest = projectedRequest.next();
            ++numMerged;
        }
        if (numMerged == 0) {

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        projectedRequest = federatedRequest.getFirstProjectedRequest();
        while (projectedRequest != null) {
            CacheableRequest fromSource = (CacheableRequest)projectedRequest.getRequest();
            Projection projection = projectedRequest.getProjection();
            if (fromSource instanceof ReadNodeRequest) {
                ReadNodeRequest readFromSource = (ReadNodeRequest)fromSource;
                Location parent = readFromSource.getActualLocationOfNode();
                List<Location> children = readFromSource.getChildren();
                for (int i = 0; i != children.size(); ++i) {
                    Location child = children.get(i);
                    if (!child.hasIdProperties()) {
                        // The the child must have been a proxy node ...
                        Location actual = actualLocationsOfProxyNodes.get(child.getPath());
                        assert actual != null;
                        children.set(i, actual);
                    }
                }
                Map<Name, Property> properties = readFromSource.getPropertiesByName();
                projectToFederated(actualLocation, projection, request, parent, children, properties);
            }
            setCacheableInfo(request, fromSource.getCachePolicy());
            projectedRequest = projectedRequest.next();
        }

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            sourceLocation = source.getActualLocationOfNode();
        } else if (projectedRequest instanceof ReadNodeRequest) {
            // In this case, the original request was to create the node only if it was missing,
            // but we knew it already exists because the parent was a placeholder and the child
            // mapped to an existing proxy node. Therefore, record the location...
            ReadNodeRequest source = (ReadNodeRequest)projectedRequest;
            sourceLocation = source.getActualLocationOfNode();
        }
        request.setActualLocationOfNode(projectToFederated(request.under(), projected.getProjection(), sourceLocation, request));
    }

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                } else if (request instanceof ReadPropertyRequest) {
                    ReadPropertyRequest read = (ReadPropertyRequest)request;
                    DateTime expires = computeExpirationTime(read);
                    getOrCreateNode(read.getActualLocationOfNode(), expires).addProperty(read.getProperty());
                } else if (request instanceof ReadNodeRequest) {
                    ReadNodeRequest read = (ReadNodeRequest)request;
                    DateTime expires = computeExpirationTime(read);
                    BatchResultsNode node = getOrCreateNode(read.getActualLocationOfNode(), expires);
                    node.setProperties(read.getPropertiesByName());
                    node.setChildren(read.getChildren());
                } else if (request instanceof ReadBlockOfChildrenRequest) {
                    throw new IllegalStateException();
                } else if (request instanceof ReadAllChildrenRequest) {
                    ReadAllChildrenRequest read = (ReadAllChildrenRequest)request;
                    DateTime expires = computeExpirationTime(read);
                    getOrCreateNode(read.getActualLocationOfNode(), expires).setChildren(read.getChildren());
                } else if (request instanceof ReadBranchRequest) {
                    ReadBranchRequest read = (ReadBranchRequest)request;
                    DateTime expires = computeExpirationTime(read);
                    for (Location location : read) {
                        BatchResultsNode node = getOrCreateNode(location, expires);
                        node.setProperties(read.getPropertiesFor(location));
                        node.setChildren(read.getChildren(location));
                    }
                }
            }
            for (Map.Entry<Path, BatchResultsNode> entry : nodes.entrySet()) {
                entry.getValue().freeze();

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            } else if (request instanceof ReadPropertyRequest) {
                ReadPropertyRequest read = (ReadPropertyRequest)request;
                DateTime expires = computeExpirationTime(read);
                getOrCreateNode(read.getActualLocationOfNode(), expires).addProperty(read.getProperty());
            } else if (request instanceof ReadNodeRequest) {
                ReadNodeRequest read = (ReadNodeRequest)request;
                DateTime expires = computeExpirationTime(read);
                BatchResultsNode node = getOrCreateNode(read.getActualLocationOfNode(), expires);
                node.setProperties(read.getPropertiesByName());
                node.setChildren(read.getChildren());
            } else if (request instanceof ReadBlockOfChildrenRequest) {
                throw new IllegalStateException();
            } else if (request instanceof ReadAllChildrenRequest) {
                ReadAllChildrenRequest read = (ReadAllChildrenRequest)request;
                DateTime expires = computeExpirationTime(read);
                getOrCreateNode(read.getActualLocationOfNode(), expires).setChildren(read.getChildren());
            } else if (request instanceof ReadBranchRequest) {
                ReadBranchRequest read = (ReadBranchRequest)request;
                DateTime expires = computeExpirationTime(read);
                for (Location location : read) {
                    BatchResultsNode node = getOrCreateNode(location, expires);
                    node.setProperties(read.getPropertiesFor(location));
                    node.setChildren(read.getChildren(location));
                }
            }
            for (Map.Entry<Path, BatchResultsNode> entry : nodes.entrySet()) {
                entry.getValue().freeze();
            }

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