Example usage for java.util Collections EMPTY_SET

Introduction

In this page you can find the example usage for java.util Collections EMPTY_SET.

Prototype

Set EMPTY_SET

To view the source code for java.util Collections EMPTY_SET.

Click Source Link

Document

The empty set (immutable).

Usage

From source file:net.sourceforge.fenixedu.domain.Enrolment.java

@Override
@SuppressWarnings("unchecked")
final public Curriculum getCurriculum(final DateTime when, final ExecutionYear year) {
    if (wasCreated(when) && (year == null || getExecutionYear().isBefore(year)) && isApproved()
            && !isPropaedeutic() && !isExtraCurricular()) {
        return new Curriculum(this, year, Collections.singleton((ICurriculumEntry) this), Collections.EMPTY_SET,
                Collections.singleton((ICurriculumEntry) this));
    }// www  .j  av a  2s .  c  om

    return Curriculum.createEmpty(this, year);
}

---

From source file:com.phoenixst.plexus.DefaultGraph.java

/**
 *  A special-case edge collection.//  w w  w  . j  a v  a2  s  .  c om
 */
private Collection edgesHelper(EdgePredicate edgePredicate) {
    Object nodeA = edgePredicate.getFirstNodeSpecification();
    Object nodeB = edgePredicate.getSecondNodeSpecification();
    Object userObject = edgePredicate.getUserObjectSpecification();
    int directionFlags = edgePredicate.getDirectionFlags();

    // Check for either node being fixed

    PredicateSpec nodeAType = getSpecType(nodeA);
    if (nodeAType == PredicateSpec.EQUALS_PREDICATE || nodeAType == PredicateSpec.OBJECT) {
        if (nodeAType == PredicateSpec.EQUALS_PREDICATE) {
            nodeA = ((EqualPredicate) nodeA).getTestObject();
        }
        AdjacencyList adj = (AdjacencyList) nodeMap.get(nodeA);
        if (adj != null) {
            CursorFilter filter = createCursorFilter(nodeB, userObject, directionFlags);
            if (filter != FALSE_CURSOR_FILTER) {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug(
                            "  " + instanceString + ".edges() returning some edges incident to " + adj.node);
                }
                return new IncEdgeCollection(adj, filter);
            }
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning empty set");
        }
        return Collections.EMPTY_SET;
    }

    PredicateSpec nodeBType = getSpecType(nodeB);
    if (nodeBType == PredicateSpec.EQUALS_PREDICATE || nodeBType == PredicateSpec.OBJECT) {
        if (nodeBType == PredicateSpec.EQUALS_PREDICATE) {
            nodeB = ((EqualPredicate) nodeB).getTestObject();
        }
        AdjacencyList adj = (AdjacencyList) nodeMap.get(nodeB);
        if (adj != null) {
            CursorFilter filter = createCursorFilter(nodeA, userObject,
                    GraphUtils.invertDirection(directionFlags));
            if (filter != FALSE_CURSOR_FILTER) {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug(
                            "  " + instanceString + ".edges() returning some edges incident to " + adj.node);
                }
                return new IncEdgeCollection(adj, filter);
            }
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning empty set");
        }
        return Collections.EMPTY_SET;
    }

    // Convert userObject to a Predicate
    Predicate userPredicate = toPredicate(userObject);

    // If we reach this point, both nodes are either of PredicateSpec.ANY
    // or PredicateSpec.PREDICATE

    if (nodeAType == PredicateSpec.ANY && nodeBType == PredicateSpec.ANY) {
        if (userPredicate == TruePredicate.INSTANCE) {
            if ((directionFlags & GraphUtils.UNDIRECTED_MASK) == 0) {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug("  " + instanceString + ".edges() returning all directed edges");
                }
                return new AnyToAnyEdgeCollection(GraphUtils.DIRECTED_EDGE_PREDICATE,
                        BASE_TAIL_DIRECTED_CURSOR_FILTER);
            } else if ((directionFlags & GraphUtils.DIRECTED_MASK) == 0) {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug("  " + instanceString + ".edges() returning all undirected edges");
                }
                return new AnyToAnyEdgeCollection(GraphUtils.UNDIRECTED_EDGE_PREDICATE,
                        BASE_TAIL_UNDIRECTED_CURSOR_FILTER);
            } else {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.debug("  " + instanceString + ".edges() returning all edges");
                }
                return edgeCollection;
            }
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning general filtered collection");
        }
        return new AnyToAnyEdgeCollection(edgePredicate,
                new AnyToAnyCursorFilter(directionFlags, userPredicate));
    }

    // If we reach this point, at least one node is of
    // PredicateSpec.PREDICATE

    // Make sure A is a predicate
    if (nodeAType == PredicateSpec.ANY) {
        nodeA = nodeB;
        nodeB = TruePredicate.INSTANCE;
        nodeBType = PredicateSpec.ANY;
        directionFlags = GraphUtils.invertDirection(directionFlags);
    }
    Predicate basePredicate = (Predicate) nodeA;

    if (nodeBType == PredicateSpec.ANY) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning optimized filtered collection");
        }
        return new PredToAnyEdgeCollection(edgePredicate, basePredicate,
                new PredToAnyCursorFilter(directionFlags, basePredicate, userPredicate));
    }

    // First is P~Q, Q(base) true.
    // Second is P~Q, Q(base) false.
    CursorFilter qFilter = new PQToQCursorFilter(directionFlags, basePredicate, (Predicate) nodeB,
            userPredicate);
    CursorFilter notQFilter = new ToPredCursorFilter(directionFlags, (Predicate) nodeB, userPredicate);

    if (LOGGER.isDebugEnabled()) {
        LOGGER.debug("  " + instanceString + ".edges() returning optimized filtered collection");
    }
    return new PToQEdgeCollection(edgePredicate, basePredicate, (Predicate) nodeB, qFilter, notQFilter);
}

---

From source file:org.lockss.crawler.TestFollowLinkCrawler.java

public void testCrawlTestCrawlFail() throws Exception {
    crawler.setDaemonPermissionCheckers(ListUtil.list(new MyMockPermissionChecker(0)));
    testAbbreviatedCrawlTest(Crawler.STATUS_NO_PUB_PERMISSION, State.Unknown, Collections.EMPTY_SET, 1,
            ListUtil.list("html"), null, ListUtil.list(nsurl1, nsurl2, nsurl3, nsurl4));
}

---

From source file:org.webcurator.domain.TargetDAOImpl.java

@SuppressWarnings("unchecked")
public Set<Long> getAncestorOids(final Long childOid) {
    if (childOid == null) {
        return Collections.EMPTY_SET;
    } else {//from w w w. j a  v  a2  s  . c  o  m
        Set<Long> parentOids = new HashSet<Long>();

        List<Long> immediateParents = getHibernateTemplate().executeFind(new HibernateCallback() {

            public Object doInHibernate(Session aSession) throws HibernateException, SQLException {
                //Criteria q = aSession.createCriteria("new java.lang.Long(oid) FROM TargetGroup").createCriteria("children").add(Restrictions.eq("oid", childOid));
                Query q = aSession.createQuery(
                        "SELECT new java.lang.Long(gm.parent.oid) FROM GroupMember gm where gm.child.oid = :childOid");
                q.setLong("childOid", childOid);
                return q.list();
            }

        });

        for (Long parentOid : immediateParents) {
            parentOids.add(parentOid);
            parentOids.addAll(getAncestorOids(parentOid));
        }

        return parentOids;
    }
}

---

From source file:org.webcurator.domain.TargetDAOImpl.java

@SuppressWarnings("unchecked")
public Set<AbstractTargetDTO> getAncestorDTOs(final Long childOid) {
    if (childOid == null) {
        return Collections.EMPTY_SET;
    } else {//from   w  w w .  j a  v  a 2s .  c o  m
        Set<AbstractTargetDTO> parents = new HashSet<AbstractTargetDTO>();

        List<AbstractTargetDTO> immediateParents = getHibernateTemplate().executeFind(new HibernateCallback() {

            public Object doInHibernate(Session aSession) throws HibernateException, SQLException {
                //               Criteria c = aSession.createCriteria("new org.webcurator.domain.model.dto.AbstractTargetDTO(t.oid, t.name, t.owner.oid, t.owner.username, t.owner.agency.name, t.state, t.profile.oid, t.objectType)", "TargetGroup");
                //               c.createCriteria("children").createCriteria("child").add(Restrictions.eq("oid", childOid));
                //               return c.list();

                Query q = aSession.createQuery(
                        "SELECT new org.webcurator.domain.model.dto.AbstractTargetDTO(t.oid, t.name, t.owner.oid, t.owner.username, t.owner.agency.name, t.state, t.profile.oid, t.objectType) FROM TargetGroup t LEFT JOIN t.children AS gm INNER JOIN gm.child AS child where child.oid = :childOid");
                q.setLong("childOid", childOid);
                return q.list();
            }

        });

        for (AbstractTargetDTO parent : immediateParents) {
            parents.add(parent);
            parents.addAll(getAncestorDTOs(parent.getOid()));
        }

        return parents;
    }
}

---

From source file:com.sugaronrest.restapicalls.SugarRestClientExt.java

public static <T> Set<T> safeSet(Set<T> other) {
    return other == null ? Collections.EMPTY_SET : other;
}

---

From source file:org.webcurator.domain.TargetDAOImpl.java

@SuppressWarnings("unchecked")
public Set<Long> getImmediateChildrenOids(final Long parentOid) {
    if (parentOid == null) {
        return Collections.EMPTY_SET;
    } else {/*from   w w  w. j a v a2s .  c om*/
        List<Long> immediateChildren = getHibernateTemplate().executeFind(new HibernateCallback() {
            public Object doInHibernate(Session aSession) throws HibernateException, SQLException {
                //Criteria q = aSession.createCriteria("new java.lang.Long(oid) FROM TargetGroup").createCriteria("children").add(Restrictions.eq("oid", childOid));
                Query q = aSession.createQuery(
                        "SELECT new java.lang.Long(gm.child.oid) FROM GroupMember gm where gm.parent.oid = :parentOid");
                q.setLong("parentOid", parentOid);
                return q.list();
            }
        });

        Set<Long> retval = new HashSet<Long>();
        retval.addAll(immediateChildren);
        return retval;
    }
}

---

From source file:com.phoenixst.plexus.DefaultGraph.java

public Collection edges(Predicate edgePredicate) {
    if (LOGGER.isDebugEnabled()) {
        LOGGER.debug(instanceString + ".edges( " + edgePredicate + " )");
    }/*from  w ww .j  av a2 s  .  c o  m*/

    if (edgePredicate == null || edgePredicate == TruePredicate.INSTANCE) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning all edges");
        }
        return edgeCollection;

    } else if (edgePredicate == FalsePredicate.INSTANCE) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning empty set");
        }
        return Collections.EMPTY_SET;

    } else if (edgePredicate == GraphUtils.DIRECTED_EDGE_PREDICATE) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning all directed edges");
        }
        return new AnyToAnyEdgeCollection(GraphUtils.DIRECTED_EDGE_PREDICATE, BASE_TAIL_DIRECTED_CURSOR_FILTER);

    } else if (edgePredicate == GraphUtils.UNDIRECTED_EDGE_PREDICATE) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning all undirected edges");
        }
        return new AnyToAnyEdgeCollection(GraphUtils.UNDIRECTED_EDGE_PREDICATE,
                BASE_TAIL_UNDIRECTED_CURSOR_FILTER);

    } else if (edgePredicate == GraphUtils.SELF_EDGE_PREDICATE) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning all self edges");
        }
        return new AnyToAnyEdgeCollection(GraphUtils.SELF_EDGE_PREDICATE, SELF_CURSOR_FILTER);

    } else if (edgePredicate instanceof EdgePredicate) {
        return edgesHelper((EdgePredicate) edgePredicate);

    } else if (edgePredicate instanceof EqualPredicate) {
        Graph.Edge testEdge = (Graph.Edge) ((EqualPredicate) edgePredicate).getTestObject();
        if (!containsEdge(testEdge)) {
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug("  " + instanceString + ".edges() returning empty set");
            }
            return Collections.EMPTY_SET;
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning singleton");
        }
        return new SingletonEdgeCollection(this, testEdge);

    } else {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("  " + instanceString + ".edges() returning general filtered collection");
        }
        return new AnyToAnyEdgeCollection(edgePredicate, new BTailCursorFilter(edgePredicate));
    }
}

---

From source file:org.hyperledger.fabric.sdk.NetworkConfig.java

/**
 * Get the channel names found.//from   ww w .  ja v  a  2 s.  c  o  m
 *
 * @return A set of the channel names found in the configuration file or empty set if none found.
 */

public Set<String> getChannelNames() {
    Set<String> ret = Collections.EMPTY_SET;

    JsonObject channels = getJsonObject(jsonConfig, "channels");
    if (channels != null) {
        final Set<String> channelNames = channels.keySet();
        if (channelNames != null && !channelNames.isEmpty()) {
            ret = new HashSet<>(channelNames);
        }
    }
    return ret;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• »