Examples of java.util.HashSet

java.util.HashSet
This class implements the Set interface, backed by a hash table (actually a HashMap instance). It makes no guarantees as to the iteration order of the set; in particular, it does not guarantee that the order will remain constant over time. This class permits the null element.
This class offers constant time performance for the basic operations (add, remove, contains and size), assuming the hash function disperses the elements properly among the buckets. Iterating over this set requires time proportional to the sum of the HashSet instance's size (the number of elements) plus the "capacity" of the backing HashMap instance (the number of buckets). Thus, it's very important not to set the initial capacity too high (or the load factor too low) if iteration performance is important.
Note that this implementation is not synchronized. If multiple threads access a hash set concurrently, and at least one of the threads modifies the set, it must be synchronized externally. This is typically accomplished by synchronizing on some object that naturally encapsulates the set. If no such object exists, the set should be "wrapped" using the {@link Collections#synchronizedSet Collections.synchronizedSet}method. This is best done at creation time, to prevent accidental unsynchronized access to the set:
```
 Set s = Collections.synchronizedSet(new HashSet(...));
```
The iterators returned by this class's iterator method are fail-fast: if the set is modified at any time after the iterator is created, in any way except through the iterator's own remove method, the Iterator throws a {@link ConcurrentModificationException}. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.
This class is a member of the Java Collections Framework. @param < E> the type of elements maintained by this set @author Josh Bloch @author Neal Gafter @version 1.37, 04/21/06 @see Collection @see Set @see TreeSet @see HashMap @since 1.2

   }


   public Collection removeMembershipByUser(String userName, boolean broadcast) throws Exception
   {


      Collection<Role> roles = new HashSet();


      try
      {
         roles = getIdentitySession().getRoleManager().findRoles(userName, null);
      }
      catch (Exception e)
      {
         //TODO:
         log.info("Identity operation error: ", e);


      }


      HashSet<MembershipImpl> memberships = new HashSet<MembershipImpl>();


      for (Role role : roles)
      {
         MembershipImpl m = new MembershipImpl();
         Group g = ((GroupDAOImpl)orgService.getGroupHandler()).convertGroup(role.getGroup());
         m.setGroupId(g.getId());
         m.setUserName(role.getUser().getId());
         m.setMembershipType(role.getRoleType().getName());
         memberships.add(m);


         if (broadcast)
         {
            preDelete(m);
         }


         getIdentitySession().getRoleManager().removeRole(role);


         if (broadcast)
         {
            postDelete(m);
         }


      }


      if (isAssociationMapped())
      {


         Collection<org.picketlink.idm.api.Group> groups = new HashSet();


         try
         {
            groups = getIdentitySession().getRelationshipManager().findAssociatedGroups(userName, null);
         }

View Full Code Here


      String gid =
         getIdentitySession().getPersistenceManager().
            createGroupKey(plGroupName, getGroupTypeFromId(groupId));


      Collection<RoleType> roleTypes = new HashSet();


      try
      {
         roleTypes = getIdentitySession().getRoleManager().findRoleTypes(userName, gid, null);
      }

View Full Code Here

      return new LinkedList(memberships);
   }


   public Collection findMembershipsByUser(String userName) throws Exception
   {
      Collection<Role> roles = new HashSet();


      try
      {
         roles = getIdentitySession().getRoleManager().findRoles(userName, null);
      }
      catch (Exception e)
      {
         //TODO:
         log.info("Identity operation error: ", e);


      }


      HashSet<MembershipImpl> memberships = new HashSet<MembershipImpl>();


      for (Role role : roles)
      {
         if (isCreateMembership(role.getRoleType().getName()))
         {
            MembershipImpl m = new MembershipImpl();
            Group g = ((GroupDAOImpl)orgService.getGroupHandler()).convertGroup(role.getGroup());
            m.setGroupId(g.getId());
            m.setUserName(role.getUser().getId());
            m.setMembershipType(role.getRoleType().getName());
            memberships.add(m);
         }
      }
      
      if (isAssociationMapped())
      {


         Collection<org.picketlink.idm.api.Group> groups = new HashSet();


         try
         {
            groups = getIdentitySession().getRelationshipManager().findAssociatedGroups(userName, null);
         }

View Full Code Here


      String gid =
         getIdentitySession().getPersistenceManager().createGroupKey(plGroupName,
            getGroupTypeFromId(groupId));


      Collection<Role> roles = new HashSet();


      try
      {
         roles = getIdentitySession().getRoleManager().findRoles(gid, null);
      }
      catch (Exception e)
      {
         //TODO:
         log.info("Identity operation error: ", e);


      }


      HashSet<MembershipImpl> memberships = new HashSet<MembershipImpl>();


      for (Role role : roles)
      {
         if (isCreateMembership(role.getRoleType().getName()))
         {
            MembershipImpl m = new MembershipImpl();
            Group g = ((GroupDAOImpl)orgService.getGroupHandler()).convertGroup(role.getGroup());
            m.setGroupId(g.getId());
            m.setUserName(role.getUser().getId());
            m.setMembershipType(role.getRoleType().getName());
            memberships.add(m);
         }
      }


      if (isAssociationMapped())
      {


         Collection<org.picketlink.idm.api.User> users = new HashSet();


         try
         {
            users = getIdentitySession().getRelationshipManager().findAssociatedUsers(gid, false, null);
         }

View Full Code Here

      return group;
   }


   public Collection findGroupByMembership(String userName, String membershipType) throws Exception
   {
      Collection<org.picketlink.idm.api.Role> allRoles = new HashSet();


      try
      {
         allRoles = getIdentitySession().getRoleManager().findRoles(userName, membershipType);
      }
      catch (Exception e)
      {
         log.info("Identity operation error: ", e);
      }


      Set<Group> exoGroups = new HashSet<Group>();


      MembershipDAOImpl mmm = (MembershipDAOImpl)orgService.getMembershipHandler();


      for (org.picketlink.idm.api.Role role : allRoles)
      {
         if (mmm.isCreateMembership(role.getRoleType().getName()))                            
         {
            exoGroups.add(convertGroup(role.getGroup()));
         }
      }


      if (mmm.isAssociationMapped() && mmm.getAssociationMapping().equals(membershipType))
      {
         Collection<org.picketlink.idm.api.Group> groups = new HashSet();


         try
         {
            groups = getIdentitySession().getRelationshipManager().findAssociatedGroups(userName, null);
         }

View Full Code Here

         // at org.exoplatform.organization.webui.component.GroupManagement.isAdministrator(GroupManagement.java:125)
         // at org.exoplatform.organization.webui.component.UIGroupExplorer.<init>(UIGroupExplorer.java:57)
         return Collections.emptyList();
      }


      Collection<org.picketlink.idm.api.Group> allGroups = new HashSet();


      try
      {
         allGroups = getIdentitySession().getRelationshipManager().findRelatedGroups(user, null, null);
      }

View Full Code Here

      if (jbidGroup.equals(getRootGroup()))
      {
         return "";
      }


      Collection<org.picketlink.idm.api.Group> parents = new HashSet();


      String gtnGroupName = getGtnGroupName(jbidGroup.getName());


      try
      {
         parents = getIdentitySession().getRelationshipManager().findAssociatedGroups(jbidGroup, null, false, false);
      }
      catch (Exception e)
      {
         //TODO:
         log.info("Identity operation error: ", e);
      }




      if (parents.size() == 0 || parents.size() > 1)
      {


         if (parents.size() > 1)
         {
            log.info("PLIDM Group has more than one parent: " + jbidGroup.getName() + "; Will try to use parent path " +
               "defined by type mappings or just place it under root /");
         }




         String id = orgService.getConfiguration().getParentId(jbidGroup.getGroupType());






         if (id != null && orgService.getConfiguration().isForceMembershipOfMappedTypes())
         {
            if (id.endsWith("/*"))
            {
               id = id.substring(0, id.length() - 2);
            }


            return id + "/" + gtnGroupName;
         }




         // All groups not connected to the root should be just below the root
         return "/" + gtnGroupName;


         //TODO: make it configurable
         // throw new IllegalStateException("Group present that is not connected to the root: " + jbidGroup.getName());


      }


      String parentGroupId = getGroupId(((org.picketlink.idm.api.Group)parents.iterator().next()));


      return parentGroupId + "/" + gtnGroupName;


   }

View Full Code Here

        return connection;
  }
      
  public synchronized void addConnectionEventListener(ConnectionEventListener listener){
    if(listeners == null){
      listeners = new HashSet();
    }
    this.listeners.add(listener);
  }

View Full Code Here

                atLeastOneFits = true;
            }


//          compose cells array list for subsequent code
            cells.clear();
            Set opt = new HashSet();
            iterator = rows.iterator();
            while (iterator.hasNext()) {
                ArrayList row = (ArrayList) iterator.next();
                
                Iterator cellIterator = row.iterator();
                while (cellIterator.hasNext()) {
                    cell = (PdfCell) cellIterator.next();
                    
                    if (!opt.contains(cell)) {
                        cells.add(cell);
                        opt.add(cell);
                    }
                }
            }
            
      // we paint the graphics of the table after looping through all the cells

View Full Code Here

    this.config = config;
  }


  @Override
  public Set<K> keys() {
    HashSet keys = new HashSet();
    Node<K, V> node = getRootNode();
    Set<Node<K, V>> children = node.getChildren();
    for (Node<K, V> child:children) {
      keys.addAll(child.getData().keySet());
    }
    return keys;
  }

View Full Code Here

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