List of usage examples for com.google.common.collect Iterators emptyIterator
@Deprecated public static <T> UnmodifiableIterator<T> emptyIterator()
From source file:presto.android.gui.FixpointSolver.java
public Iterator<NOpNode> findProducers(NNode objectNode) { Set<NOpNode> set = viewProducers.get(objectNode); if (set == null || set.isEmpty()) { return Iterators.emptyIterator(); } else {/*from w w w . ja va 2s . c om*/ return set.iterator(); } }
From source file:org.apache.phoenix.util.ScanUtil.java
public static Iterator<Filter> getFilterIterator(Scan scan) { Iterator<Filter> filterIterator; Filter topLevelFilter = scan.getFilter(); if (topLevelFilter == null) { filterIterator = Iterators.emptyIterator(); } else if (topLevelFilter instanceof FilterList) { filterIterator = ((FilterList) topLevelFilter).getFilters().iterator(); } else {/*from w w w . j av a 2 s. c o m*/ filterIterator = Iterators.singletonIterator(topLevelFilter); } return filterIterator; }
From source file:org.apache.marmotta.commons.sesame.repository.ResourceUtils.java
/** * List outgoing edges from this resource to other resources, using the property label passed * as argument. If limit is bigger than 0, then a maximum of limit triples will be returned. * Otherwise, all triples will be returned. * <p/>//w w w . j a va 2 s .c o m * The parameter propLabel is in the form of a SeRQL or SPARQL id. It can take one of the following * values: * <ul> * <li>a URI enclosed in < >, e.g. <http://www.example.com/myProp></li> * <li>a uri prefix, followed by a colon and the property name, e.g. ex:myProp</li> * <li>the value "null", in which case all outgoing edges are listed regardless of their label * (wildcard)</li> * </ul> * The result will be an iterable that allows to iterate over Statements. The underlying ClosableIteration will be closed when the last element has * been consumed. * * @param propLabel the label of the property to be queried, or null for wildcard * @param context outgoing triples just for the given space * @return an iterable over the Statements that are outgoing edges of this resource */ public static Iterable<? extends Statement> listOutgoing(final RepositoryConnection con, final Resource r, final String propLabel, final URI context) throws RepositoryException { final URI property; if (propLabel != null) { String prop_uri = resolvePropLabel(con, propLabel); if (prop_uri == null) { return Collections.emptySet(); } else { property = con.getValueFactory().createURI(prop_uri); } } else { property = null; } final Resource[] contexts; if (context != null) { contexts = new Resource[] { context }; } else { contexts = new Resource[0]; } return new Iterable<Statement>() { @Override public Iterator<Statement> iterator() { try { return ResultUtils.unwrap(con.getStatements(r, property, null, true, contexts)); } catch (RepositoryException ex) { ExceptionUtils.handleRepositoryException(ex, ResourceUtils.class); return Iterators.emptyIterator(); } } }; }
From source file:org.apache.marmotta.commons.sesame.repository.ResourceUtils.java
/** * List incoming edges from other resources to this resource, using the property label passed * as argument. If limit is bigger than 0, then a maximum of limit triples will be returned. * Otherwise, all triples will be returned. * <p/>/* w w w . j av a 2 s. com*/ * The parameter propLabel is in the form of a SeRQL or SPARQL id. It can take one of the following * values: * <ul> * <li>a URI enclosed in < >, e.g. <http://www.example.com/myProp></li> * <li>a uri prefix, followed by a colon and the property name, e.g. ex:myProp</li> * <li>the value "null", in which case all outgoing edges are listed regardless of their label * (wildcard)</li> * </ul> * The result will be an iterable that allows to iterate over Statements. * * @param propLabel the label of the property to be queried, or null for wildcard * @param r the maximum number of triples to retrieve * @param context incoming resources just for the given context/space * @return an iterable over the Statements that are incoming edges of this resource */ public static Iterable<? extends Statement> listIncoming(final RepositoryConnection con, final Resource r, final String propLabel, final URI context) throws RepositoryException { final URI property; if (propLabel != null) { String prop_uri = resolvePropLabel(con, propLabel); if (prop_uri == null) { return Collections.emptySet(); } else { property = con.getValueFactory().createURI(prop_uri); } } else { property = null; } final Resource[] contexts; if (context != null) { contexts = new Resource[] { context }; } else { contexts = new Resource[0]; } return new Iterable<Statement>() { @Override public Iterator<Statement> iterator() { try { return ResultUtils.unwrap(con.getStatements(null, property, r, true, contexts)); } catch (RepositoryException ex) { ExceptionUtils.handleRepositoryException(ex, ResourceUtils.class); return Iterators.emptyIterator(); } } }; }
From source file:org.apache.jackrabbit.oak.jcr.session.NodeImpl.java
@Nonnull private Iterator<String> getMixinTypeNames(@Nonnull Tree tree) throws RepositoryException { Iterator<String> mixinNames = Iterators.emptyIterator(); if (tree.hasProperty(JcrConstants.JCR_MIXINTYPES) || canReadProperty(tree, JcrConstants.JCR_MIXINTYPES)) { mixinNames = TreeUtil.getNames(tree, JcrConstants.JCR_MIXINTYPES).iterator(); } else if (tree.getStatus() != Status.NEW) { // OAK-2441: for backwards compatibility with Jackrabbit 2.x try to // read the primary type from the underlying node state. mixinNames = TreeUtil//from ww w .j a v a 2 s . c om .getNames(RootFactory.createReadOnlyRoot(sessionDelegate.getRoot()).getTree(tree.getPath()), JcrConstants.JCR_MIXINTYPES) .iterator(); } return mixinNames; }
From source file:org.apache.marmotta.commons.sesame.repository.ResourceUtils.java
/** * Return the list of types as Resources that are associated with this resource using the * rdf:type RDF property./*from w ww. ja v a 2 s . com*/ * * @return an iterable of Resource instances that represent the RDF types of this resource */ public static Iterable<? extends Resource> getTypes(final RepositoryConnection con, final Resource r, Resource context) throws RepositoryException { final URI rdf_type = con.getValueFactory().createURI(Namespaces.NS_RDF + "type"); if (rdf_type != null) { final Resource[] contexts; if (context != null) { contexts = new Resource[] { context }; } else { contexts = new Resource[0]; } return Iterables.transform(Iterables.filter(new Iterable<Statement>() { @Override public Iterator<Statement> iterator() { try { return ResultUtils.unwrap(con.getStatements(r, rdf_type, null, true, contexts)); } catch (RepositoryException e) { ExceptionUtils.handleRepositoryException(e, ResourceUtils.class); return Iterators.emptyIterator(); } } }, new Predicate<Statement>() { @Override public boolean apply(Statement input) { return input.getObject() instanceof Resource; } }), new Function<Statement, Resource>() { @Override public Resource apply(Statement input) { return (Resource) input.getObject(); } }); } else { return Collections.emptyList(); } }
From source file:org.apache.jackrabbit.oak.plugins.document.NodeDocument.java
@Nonnull
Iterator<NodeDocument> getAllPreviousDocs() {
if (getPreviousRanges().isEmpty()) {
return Iterators.emptyIterator();
}//from w w w . j a v a 2 s .c o m
//Currently this method would fire one query per previous doc
//If that poses a problem we can try to find all prev doc by relying
//on property that all prevDoc id would starts <depth+2>:p/path/to/node
return new AbstractIterator<NodeDocument>() {
private Queue<Map.Entry<Revision, Range>> previousRanges = Queues
.newArrayDeque(getPreviousRanges().entrySet());
@Override
protected NodeDocument computeNext() {
if (!previousRanges.isEmpty()) {
Map.Entry<Revision, Range> e = previousRanges.remove();
NodeDocument prev = getPreviousDoc(e.getKey(), e.getValue());
if (prev != null) {
previousRanges.addAll(prev.getPreviousRanges().entrySet());
return prev;
}
}
return endOfData();
}
};
}
From source file:org.apache.jackrabbit.oak.plugins.document.NodeDocument.java
/** * Returns previous leaf documents. Those are the previous documents with * a type {@code !=} {@link SplitDocType#INTERMEDIATE}. The documents are * returned in descending order based on the most recent change recorded * in the previous document. A change is defined as an entry in either the * {@link #REVISIONS} or {@link #COMMIT_ROOT} map. * * @return the leaf documents in descending order. *//*from w ww .ja va2 s . com*/ @Nonnull Iterator<NodeDocument> getPreviousDocLeaves() { if (getPreviousRanges().isEmpty()) { return Iterators.emptyIterator(); } // create a mutable copy final NavigableMap<Revision, Range> ranges = Maps.newTreeMap(getPreviousRanges()); return new AbstractIterator<NodeDocument>() { @Override protected NodeDocument computeNext() { NodeDocument next; for (;;) { Map.Entry<Revision, Range> topEntry = ranges.pollFirstEntry(); if (topEntry == null) { // no more ranges next = endOfData(); break; } NodeDocument prev = getPreviousDoc(topEntry.getKey(), topEntry.getValue()); if (prev == null) { // move on to next range continue; } if (topEntry.getValue().getHeight() == 0) { // this is a leaf next = prev; break; } else { // replace intermediate entry with its previous ranges ranges.putAll(prev.getPreviousRanges()); } } return next; } }; }
From source file:com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.GerritTrigger.java
/** * Returns an iterator over the all gerrit projects configured for the trigger. * * @return an iterator over the all gerrit projects configured for the trigger. */// w ww . j a v a 2s.co m private Iterator<GerritProject> getAllGerritProjectsIterator() { if (gerritProjects != null && dynamicGerritProjects != null) { return Iterators.concat(gerritProjects.iterator(), dynamicGerritProjects.iterator()); } if (gerritProjects == null && dynamicGerritProjects != null) { return dynamicGerritProjects.iterator(); } if (gerritProjects != null) { return gerritProjects.iterator(); } return Iterators.emptyIterator(); }
From source file:org.eclipse.sirius.diagram.business.internal.experimental.sync.DDiagramSynchronizer.java
/** * Returns <code>true</code> if the given edge is displayed in another * specific layer configuration.//w w w . j ava2s . co m * * @param edgeCandidate * the edge to check. * @param mappingsToEdgeTargets * mapping to edges, it contains nodes that are actually * displayed (with the actual layer configuration). * @return <code>true</code> if the given edge is displayed in a specific * layer configuration. */ private boolean isDefinedInAnotherLayer(final DEdgeCandidate edgeCandidate, final Map<DiagramElementMapping, Collection<EdgeTarget>> mappingsToEdgeTargets) { if (edgeCandidate.getEdge() == null) { return false; } final DEdge edge = edgeCandidate.getEdge(); final EdgeTarget source = edge.getSourceNode(); final EdgeTarget target = edge.getTargetNode(); /* * If the source of target is not a DDiagramElement then i don't know * how to manage it. I expect that the behavior is managed by another * component. */ final boolean sourceIsValid = source != null && (!(source instanceof DDiagramElement) || ((DDiagramElement) source).getParentDiagram() == this.diagram); final boolean targetIsValid = target != null && (!(target instanceof DDiagramElement) || ((DDiagramElement) target).getParentDiagram() == this.diagram); /* * If the source and the target are valid then we need to check that * there are not displayed on the diagram (it means that the edge is not * displayed). */ final Option<EdgeMapping> actualMapping = new IEdgeMappingQuery(edge.getActualMapping()).getEdgeMapping(); final Iterator<DiagramElementMapping> sourceMappings; final Iterator<DiagramElementMapping> targetMappings; if (actualMapping.some()) { sourceMappings = actualMapping.get().getSourceMapping().iterator(); targetMappings = actualMapping.get().getTargetMapping().iterator(); } else { sourceMappings = Iterators.emptyIterator(); targetMappings = Iterators.emptyIterator(); } final boolean sourceIsNotDisplayed = nodeIsNotDisplayed(sourceMappings, source, mappingsToEdgeTargets); final boolean targetIsNotDisplayed = nodeIsNotDisplayed(targetMappings, target, mappingsToEdgeTargets); return sourceIsValid && targetIsValid && (sourceIsNotDisplayed || targetIsNotDisplayed); }