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.opendaylight.controller.sample.toaster.it.NodeBuilderElement.java

@SuppressWarnings("unchecked")
@Override/*from w w  w.jav a  2  s.  c  o  m*/
public Node getFirstChild() {
    if (!isFirstInit) {

        if (node instanceof org.opendaylight.yangtools.yang.data.api.schema.LeafNode
                || node instanceof org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode) {
            //  System.out.println("The node is "+ this.getNodeName());
            //  System.out.println("The above node is either leaf node or leafsetentry node");
            firstChild = new NodeBuilderText(node.getValue().toString(), this, null);
        } else if (node instanceof org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListNode) {
            // handle list here ..
            // System.out.println("The node is "+ this.getNodeName());

            Iterable<DataContainerChild<? extends PathArgument, ?>> list = ((Iterable<DataContainerChild<? extends PathArgument, ?>>) node
                    .getValue());

            Iterator<DataContainerChild<? extends PathArgument, ?>> listiter = list.iterator();

            DataContainerNode<?> dataContainerNode = (DataContainerNode<?>) listiter.next();

            Iterator<DataContainerChild<? extends PathArgument, ?>> Childiterator = dataContainerNode.getValue()
                    .iterator();
            firstChild = new NodeBuilderElement((NormalizedNode<?, ?>) iterator.next(), this, Childiterator);
            this.iterator = Iterators.concat(listiter, this.iterator);
            //  System.out.println("its first child is "+ firstChild.getNodeName());

        } else if (node instanceof org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode) {
            // handle list here ..
            //  System.out.println("The node is "+ this.getNodeName());
            Iterable<NormalizedNode<?, ?>> list = ((Iterable<NormalizedNode<?, ?>>) node.getValue());

            Iterator<NormalizedNode<?, ?>> listiter = list.iterator();

            firstChild = new NodeBuilderText(listiter.next().getValue().toString(), this, null);
            //TypeConflict here
            this.iterator = Iterators.concat(listiter, this.iterator);
            //     System.out.println("its first child is "+ firstChild.getNodeName());
        }

        // get iterator on children, get first child from iterator
        else {
            //  System.out.println("The node is "+ this.getNodeName());
            DataContainerNode<?> dataContainerNode = (DataContainerNode<?>) node;
            Iterator<DataContainerChild<? extends PathArgument, ?>> dataiterator = dataContainerNode.getValue()
                    .iterator();
            DataContainerChild<? extends PathArgument, ?> something = dataiterator.next();
            if (something instanceof org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListNode) {
                Iterable<NormalizedNode<?, ?>> containerlist = (Iterable<NormalizedNode<?, ?>>) something
                        .getValue();
                Iterator<NormalizedNode<?, ?>> containerListIterator = containerlist.iterator();

                NormalizedNode<?, ?> someNode = containerListIterator.next();

                firstChild = new NodeBuilderElement(someNode, this, containerListIterator);
            } else {
                firstChild = new NodeBuilderElement(something, this, iterator);
            }
        }

        // construct a NodeBuilderElement, passing in the new node, the same
        // parent, and the iterator
        // cache the node builder element to first child
        isFirstInit = true;
    }
    return firstChild;
}

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From source file:org.optaplanner.core.impl.heuristic.selector.move.composite.UnionMoveSelector.java

public Iterator<Move> iterator() {
    if (!randomSelection) {
        Iterator<Move> iterator = Iterators.emptyIterator();
        for (MoveSelector moveSelector : childMoveSelectorList) {
            iterator = Iterators.concat(iterator, moveSelector.iterator());
        }//from  w w w .j a v a 2 s. com
        return iterator;
    } else {
        return new RandomUnionMoveIterator();
    }
}

---

From source file:org.fcrepo.kernel.utils.iterators.RdfStream.java

/**
 * @param newTriple Triples to add.//www  .  j  av a2s  .c o m
 * @return This object for continued use.
 */
public <T extends Triple> RdfStream concat(final T newTriple) {
    triples = Iterators.concat(singletonIterator(newTriple), triples);
    return this;
}

---

From source file:org.apache.james.transport.mailets.LocalDelivery.java

/**
 * @see org.apache.mailet.base.GenericMailet#init()
 *//*from  w  ww  .j a  v a2 s . co m*/
public void init() throws MessagingException {

    super.init();

    recipientRewriteTable = new RecipientRewriteTable();
    recipientRewriteTable.setDomainList(domainList);
    recipientRewriteTable.setRecipientRewriteTable(rrt);
    recipientRewriteTable.init(getMailetConfig());
    sieveMailet = new SieveMailet(usersRepository, mailboxManager,
            ResourceLocatorImpl.instanciate(usersRepository, sieveRepository), "INBOX");
    sieveMailet.init(new MailetConfig() {
        public String getInitParameter(String name) {
            if ("addDeliveryHeader".equals(name)) {
                return "Delivered-To";
            } else if ("resetReturnPath".equals(name)) {
                return "true";
            } else {
                return getMailetConfig().getInitParameter(name);
            }
        }

        public Iterator<String> getInitParameterNames() {
            return Iterators.concat(getMailetConfig().getInitParameterNames(),
                    Lists.newArrayList("addDeliveryHeader", "resetReturnPath").iterator());
        }

        public MailetContext getMailetContext() {
            return getMailetConfig().getMailetContext();
        }

        public String getMailetName() {
            return getMailetConfig().getMailetName();
        }

    });
    // Override the default value of "quiet"
    sieveMailet.setQuiet(getInitParameter("quiet", true));
}

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From source file:org.opencms.i18n.CmsVfsResourceBundle.java

/**
 * @see java.util.ResourceBundle#getKeys()
 */// ww w.j a va 2 s  .  c o  m
@Override
public Enumeration<String> getKeys() {

    Iterator<String> myKeyIter = handleKeySet().iterator();
    Iterator<String> result = myKeyIter;
    if (parent != null) {
        Iterator<String> parentKeyIter = Iterators.forEnumeration(parent.getKeys());
        result = Iterators.concat(myKeyIter, parentKeyIter);
    }
    return Iterators.asEnumeration(result);
}

---

From source file:org.locationtech.geogig.storage.postgresql.v9.PGObjectStoreObjectIterator.java

private @Nullable ObjectInfo<T> computeNext() {
    if (nextBatch != null && nextBatch.hasNext()) {
        return nextBatch.next();
    }/*w ww.j  a v  a2 s  .  c  om*/
    if (!nodes.hasNext()) {
        return null;
    }
    {
        ObjectInfo<T> obj = tryNextCached();
        if (obj != null) {
            return obj;
        }
    }

    final int queryBatchSize = store.getAllBatchSize;
    final int superPartitionBatchSize = 10 * queryBatchSize;

    List<ObjectInfo<T>> hits = new LinkedList<>();
    List<NodeRef> cacheMisses = new ArrayList<>(superPartitionBatchSize);
    for (int i = 0; i < superPartitionBatchSize && nodes.hasNext(); i++) {
        NodeRef node = nodes.next();
        ObjectId id = node.getObjectId();
        RevObject cached = cache.getIfPresent(id);
        if (cached == null) {
            cacheMisses.add(node);
        } else {
            T obj = cacheHit(id, cached);
            if (obj != null) {
                hits.add(new ObjectInfo<T>(node, obj));
            }
        }
    }
    List<List<NodeRef>> partitions = Lists.partition(cacheMisses, queryBatchSize);
    List<Future<List<ObjectInfo<T>>>> futures = new ArrayList<>(partitions.size());
    for (List<NodeRef> partition : partitions) {
        Future<List<ObjectInfo<T>>> dbBatch;
        dbBatch = store.getObjects(partition, listener, type);
        futures.add(dbBatch);
    }

    final Function<Future<List<ObjectInfo<T>>>, List<ObjectInfo<T>>> futureGetter = (objs) -> {
        try {
            return objs.get();
        } catch (InterruptedException | ExecutionException e) {
            throw new RuntimeException(e);
        }
    };

    Iterable<List<ObjectInfo<T>>> lists = Iterables.transform(futures, futureGetter);
    Iterable<ObjectInfo<T>> concat = Iterables.concat(lists);
    Iterator<ObjectInfo<T>> iterator = concat.iterator();

    nextBatch = Iterators.concat(hits.iterator(), iterator);
    return computeNext();
}

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From source file:com.yahoo.yqlplus.api.types.Annotations.java

@Override
public Iterator<Map.Entry<String, Object>> iterator() {
    // we don't expect much use of this
    final Set<String> seen = Sets.newTreeSet();
    return Iterators.filter(Iterators.concat(annotations.entrySet().iterator(), parent.iterator()),
            new Predicate<Map.Entry<String, Object>>() {
                @Override/*from w  w w.j  a v a  2  s  . co m*/
                public boolean apply(Map.Entry<String, Object> input) {
                    return seen.add(input.getKey());
                }
            });
}

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From source file:org.apache.jackrabbit.oak.security.principal.PrincipalProviderImpl.java

@Nonnull
@Override//from   w  w w .  ja  va2s. c  om
public Iterator<? extends Principal> findPrincipals(@Nullable final String nameHint, final int searchType) {
    try {
        Iterator<Authorizable> authorizables = findAuthorizables(nameHint, searchType);
        Iterator<Principal> principals = Iterators.transform(
                Iterators.filter(authorizables, Predicates.notNull()), new AuthorizableToPrincipal());

        if (matchesEveryone(nameHint, searchType)) {
            principals = Iterators.concat(principals,
                    Iterators.singletonIterator(EveryonePrincipal.getInstance()));
            return Iterators.filter(principals, new EveryonePredicate());
        } else {
            return principals;
        }
    } catch (RepositoryException e) {
        log.debug(e.getMessage());
        return Iterators.emptyIterator();
    }
}

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

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

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From source file:org.apache.giraph.counters.GiraphTimers.java

@Override
public Iterator<GiraphHadoopCounter> iterator() {
    return Iterators.concat(jobCounters().iterator(), superstepCounters().values().iterator());
}

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