Example usage for com.google.common.collect Iterators concat

Introduction

In this page you can find the example usage for com.google.common.collect Iterators concat.

Prototype

public static <T> Iterator<T> concat(Iterator<? extends T> a, Iterator<? extends T> b) 

Source Link

Document

Combines two iterators into a single iterator.

Usage

From source file:org.locationtech.geogig.storage.internal.ObjectStoreDiffObjectIterator.java

private @Nullable DiffObjectInfo<T> computeNext() {
    if (nextBatch != null && nextBatch.hasNext()) {
        return nextBatch.next();
    }//w  ww  . j av  a  2 s  . c o m
    if (!nodes.hasNext()) {
        return null;
    }

    final int queryBatchSize = this.getAllBatchSize;

    List<DiffEntry> nextEntries = Iterators.partition(this.nodes, queryBatchSize).next();
    Set<ObjectId> leftEntriesIds = new HashSet<>();
    Set<ObjectId> rightEntriesIds = this.leftStore == this.rightStore ? leftEntriesIds : new HashSet<>();

    nextEntries.forEach((e) -> {
        ObjectId oldId = e.oldObjectId();
        ObjectId newId = e.newObjectId();
        if (!oldId.isNull()) {
            leftEntriesIds.add(oldId);
        }
        if (!newId.isNull()) {
            rightEntriesIds.add(newId);
        }
    });

    Iterator<T> objects = leftStore.getAll(leftEntriesIds, NOOP_LISTENER, this.type);
    if (rightEntriesIds != leftEntriesIds && !rightEntriesIds.isEmpty()) {
        objects = Iterators.concat(objects, rightStore.getAll(rightEntriesIds, NOOP_LISTENER, this.type));
    }
    Map<ObjectId, T> objectsById = new HashMap<>();
    objects.forEachRemaining((o) -> objectsById.putIfAbsent(o.getId(), o));
    nextBatch = createBatch(nextEntries, objectsById);
    return computeNext();
}

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From source file:org.eclipse.sirius.ext.emf.AllContents.java

/**
 * {@inheritDoc}/*from ww  w  .  j  av  a  2  s .  c o  m*/
 */
public Iterator<EObject> iterator() {
    final Iterator<EObject> contentsIterator;
    if (root == null) {
        contentsIterator = Iterators.<EObject>emptyIterator();
    } else if (klass == null) {
        contentsIterator = root.eAllContents();
    } else {
        contentsIterator = Iterators.filter(root.eAllContents(), new Predicate<EObject>() {
            public boolean apply(EObject input) {
                return klass.isInstance(input);
            }
        });
    }
    if (includeRoot) {
        return Iterators.concat(Iterators.singletonIterator(root), contentsIterator);
    } else {
        return contentsIterator;
    }
}

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From source file:org.geogit.osm.cli.commands.OSMExport.java

/**
 * Executes the export command using the provided options.
 *///from  ww w.jav  a 2  s . com
@Override
protected void runInternal(GeogitCLI cli) throws IOException {
    if (args.size() < 1 || args.size() > 2) {
        printUsage();
        throw new CommandFailedException();
    }

    checkParameter(bbox == null || bbox.size() == 4, "The specified bounding box is not correct");

    geogit = cli.getGeogit();

    String osmfile = args.get(0);

    String ref = "WORK_HEAD";
    if (args.size() == 2) {
        ref = args.get(1);
        Optional<ObjectId> tree = geogit.command(ResolveTreeish.class).setTreeish(ref).call();
        checkParameter(tree.isPresent(), "Invalid commit or reference: %s", ref);
    }

    File file = new File(osmfile);
    checkParameter(!file.exists() || overwrite, "The selected file already exists. Use -o to overwrite");

    Iterator<EntityContainer> nodes = getFeatures(ref + ":node");
    Iterator<EntityContainer> ways = getFeatures(ref + ":way");
    Iterator<EntityContainer> iterator = Iterators.concat(nodes, ways);
    if (file.getName().endsWith(".pbf")) {
        BlockOutputStream output = new BlockOutputStream(new FileOutputStream(file));
        OsmosisSerializer serializer = new OsmosisSerializer(output);
        while (iterator.hasNext()) {
            EntityContainer entity = iterator.next();
            serializer.process(entity);
        }
        serializer.complete();
    } else {
        XmlWriter writer = new XmlWriter(file, CompressionMethod.None);
        while (iterator.hasNext()) {
            EntityContainer entity = iterator.next();
            writer.process(entity);
        }
        writer.complete();
    }

}

---

From source file:es.usc.citius.composit.wsc08.data.WSCLazyServiceProvider.java

@Override
public Iterable<Operation<Concept>> getOperationsWithInput(final Concept input) {
    final Set<Instance> instances = kb.getInstances(input);
    return new Iterable<Operation<Concept>>() {
        @Override/*w ww . j  av  a 2s.  c om*/
        public Iterator<Operation<Concept>> iterator() {
            Iterator<Operation<String>> iteratorResult = Iterators.emptyIterator();
            for (Instance instance : instances) {
                iteratorResult = Iterators.concat(iteratorResult,
                        delegatedProvider.getOperationsWithInput(instance.getID()).iterator());
            }
            return Iterators.transform(iteratorResult, new Function<Operation<String>, Operation<Concept>>() {
                @Override
                public Operation<Concept> apply(Operation<String> op) {
                    return translate(op);
                }
            });
        }
    };

}

---

From source file:net.stargraph.core.EntityIterator.java

private Iterator<Node> createIterator() {
    Model model = core.getGraphModel(kbId.getId());
    Graph g = model.getGraph();/*  w  w w.  jav  a2s .c om*/
    ExtendedIterator<Triple> exIt = g.find(Node.ANY, null, null);
    ExtendedIterator<Node> subjIt = exIt.mapWith(Triple::getSubject);
    exIt = g.find(null, null, Node.ANY);
    ExtendedIterator<Node> objIt = exIt.mapWith(Triple::getObject);
    return Iterators.concat(subjIt, objIt);
}

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From source file:org.apache.cassandra.cql3.Operations.java

/**
 * {@inheritDoc}
 */
@Override
public Iterator<Operation> iterator() {
    return Iterators.concat(staticOperations.iterator(), regularOperations.iterator());
}

---

From source file:com.thinkbiganalytics.metadata.modeshape.sla.JcrServiceLevelAgreement.java

@Override
public List<ObligationGroup> getObligationGroups() {
    try {/*from  w w  w  .  j  ava  2  s  .  co m*/
        @SuppressWarnings("unchecked")
        Iterator<Node> defItr = (Iterator<Node>) this.node.getNodes(DEFAULT_GROUP);
        @SuppressWarnings("unchecked")
        Iterator<Node> grpItr = (Iterator<Node>) this.node.getNodes(GROUPS);

        return Lists.newArrayList(Iterators.concat(Iterators.transform(defItr, (groupNode) -> {
            return JcrUtil.createJcrObject(groupNode, JcrObligationGroup.class, JcrServiceLevelAgreement.this);
        }), Iterators.transform(grpItr, (groupNode) -> {
            return JcrUtil.createJcrObject(groupNode, JcrObligationGroup.class, JcrServiceLevelAgreement.this);
        })));
    } catch (RepositoryException e) {
        throw new MetadataRepositoryException("Failed to retrieve the obligation nodes", e);
    }

}

---

From source file:org.geogit.osm.out.cli.OSMExport.java

/**
 * Executes the export command using the provided options.
 * /*from ww  w .  j ava 2 s  . c o m*/
 * @param cli
 */
@Override
protected void runInternal(GeogitCLI cli) throws Exception {
    if (cli.getGeogit() == null) {
        cli.getConsole().println("Not a geogit repository: " + cli.getPlatform().pwd());
        return;
    }

    if (args.size() < 1 || args.size() > 2) {
        printUsage();
        return;
    }

    checkArgument(bbox == null || bbox.size() == 4, "The specified bounding box is not correct");

    geogit = cli.getGeogit();

    String osmfile = args.get(0);

    String ref = "WORK_HEAD";
    if (args.size() == 2) {
        ref = args.get(1);
        Optional<ObjectId> tree = geogit.command(ResolveTreeish.class).setTreeish(ref).call();
        Preconditions.checkArgument(tree.isPresent(), "Invalid commit or reference: %s", ref);
    }

    File file = new File(osmfile);
    checkArgument(!file.exists() || overwrite, "The selected file already exists. Use -o to overwrite");

    Iterator<EntityContainer> nodes = getFeatures(ref + ":node");
    Iterator<EntityContainer> ways = getFeatures(ref + ":way");
    Iterator<EntityContainer> iterator = Iterators.concat(nodes, ways);
    if (file.getName().endsWith(".pbf")) {
        BlockOutputStream output = new BlockOutputStream(new FileOutputStream(file));
        OsmosisSerializer serializer = new OsmosisSerializer(output);
        while (iterator.hasNext()) {
            EntityContainer entity = iterator.next();
            serializer.process(entity);
        }
        serializer.complete();
    } else {
        XmlWriter writer = new XmlWriter(file, CompressionMethod.None);
        while (iterator.hasNext()) {
            EntityContainer entity = iterator.next();
            writer.process(entity);
        }
        writer.complete();
    }

}

---

From source file:org.dspace.app.bulkedit.MetadataExport.java

private Iterator<Item> addItemsToResult(Iterator<Item> result, Iterator<Item> items) {
    if (result == null) {
        result = items;/*from   ww w  .ja v a  2  s  . c  o m*/
    } else {
        result = Iterators.concat(result, items);
    }

    return result;
}

---

From source file:org.eclipse.papyrus.infra.table.controlmode.helpers.TableMoveHelper.java

/**
 * Creates an iterable containing all the Papyrus Tables that are descending from the context.
 * /*from   w  ww  .j av  a 2 s.  com*/
 * @author olivier melois (Atos)
 */
public static Iterable<EObject> createDescendantTablesIterable(EObject context) {

    Set<EObject> result = Sets.newHashSet();

    TreeIterator<EObject> eAllContents = EcoreUtil.getAllProperContents(context, true); // was context.eAllContents().
    Iterator<EObject> contextAndDescendants = Iterators.concat(eAllContents,
            Iterators.singletonIterator(context));

    final Predicate<Setting> keepPapyrusTableInstances = new Predicate<Setting>() {

        public boolean apply(Setting setting) {
            boolean result = true;
            if (setting != null) {
                EObject settingEObject = setting.getEObject();
                result &= settingEObject instanceof PapyrusTableInstance;
                result &= PapyrustableinstancePackage.Literals.PAPYRUS_TABLE_INSTANCE__TABLE == setting
                        .getEStructuralFeature();
            } else {
                result = false;
            }
            return result;
        }
    };

    /*
     * Predicate used to keep the usages which are PapyrusTableInstances
     */
    Predicate<Setting> keepTableInstances = new Predicate<Setting>() {

        public boolean apply(Setting setting) {
            boolean result = true;
            if (setting != null) {
                EObject settingEObject = setting.getEObject();
                result &= settingEObject instanceof TableInstance;
                result &= setting
                        .getEStructuralFeature() == TableinstancePackage.Literals.TABLE_INSTANCE__CONTEXT;

                Collection<Setting> references = PapyrusEcoreUtils.getUsages(settingEObject);
                Iterable<Setting> papyrusTableInstances = Iterables.filter(references,
                        keepPapyrusTableInstances);
                //Veryfing that there is at least one papyrusTableInstance
                result = result && !Iterables.isEmpty(papyrusTableInstances);

            } else {
                result = false;
            }
            return result;
        }
    };

    /*
     * Function to get the eObject from a setting
     */
    Function<Setting, EObject> getEObject = new Function<Setting, EObject>() {

        public EObject apply(Setting input) {
            EObject settingEObject = input.getEObject();
            Collection<Setting> references = PapyrusEcoreUtils.getUsages(settingEObject);
            Iterable<Setting> papyrusTableInstances = Iterables.filter(references, keepPapyrusTableInstances);
            //Getting the eobject of thie first element of this iterable.
            return Iterables.get(papyrusTableInstances, 0).getEObject();
        }

    };

    /*
     * For the context and his descendants :
     */
    while (contextAndDescendants.hasNext()) {
        EObject current = contextAndDescendants.next();
        //Usages
        Iterable<Setting> usages = PapyrusEcoreUtils.getUsages(current);
        //Filtering to keep only papyrus table instances.
        Iterable<Setting> tableInstanceSettings = Iterables.filter(usages, keepTableInstances);
        //Getting the eObjects 
        Iterable<EObject> papyrusTableInstances = Iterables.transform(tableInstanceSettings, getEObject);
        //Adding all the kept usages.
        Iterables.addAll(result, papyrusTableInstances);
    }

    return result;
}

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