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 static final String LANES = "BPMN.Lanes";


  @SuppressWarnings("unchecked")
  public LaneHandler() {
    if ((this.validParents == null) && (this.validPeers == null)) {
      this.validParents = new HashSet();
      this.validParents.add(RuleFlowProcess.class);


      this.validPeers = new HashSet();
          this.validPeers.add(null);
          this.validPeers.add(Lane.class);
          this.validPeers.add(Variable.class);
          this.validPeers.add(Node.class);
          this.validPeers.add(SequenceFlow.class);

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    this.childGroups = childs;
  }


  public void addChildGroup(final ContentItemGroup child) {
    if (this.childGroups == null) {
      this.childGroups = new HashSet();
    }
    this.childGroups.add(child);
  }

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public class ErrorHandler extends BaseAbstractHandler implements Handler {
  
  @SuppressWarnings("unchecked")
  public ErrorHandler() {
    if ((this.validParents == null) && (this.validPeers == null)) {
      this.validParents = new HashSet();
      this.validParents.add(Definitions.class);


      this.validPeers = new HashSet();
      this.validPeers.add(null);
            this.validPeers.add(ItemDefinition.class);
            this.validPeers.add(Message.class);
            this.validPeers.add(Interface.class);
            this.validPeers.add(Escalation.class);

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public class MessageHandler extends BaseAbstractHandler implements Handler {
  
  @SuppressWarnings("unchecked")
  public MessageHandler() {
    if ((this.validParents == null) && (this.validPeers == null)) {
      this.validParents = new HashSet();
      this.validParents.add(Definitions.class);


      this.validPeers = new HashSet();
      this.validPeers.add(null);
            this.validPeers.add(ItemDefinition.class);
            this.validPeers.add(Message.class);
            this.validPeers.add(Interface.class);
            this.validPeers.add(Escalation.class);

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public class InMessageRefHandler extends BaseAbstractHandler implements Handler {
  
  @SuppressWarnings("unchecked")
  public InMessageRefHandler() {
    if ((this.validParents == null) && (this.validPeers == null)) {
      this.validParents = new HashSet();
      this.validParents.add(Operation.class);


      this.validPeers = new HashSet();
      this.validPeers.add(null);


      this.allowNesting = false;
    }
  }

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public class InterfaceHandler extends BaseAbstractHandler implements Handler {
  
  @SuppressWarnings("unchecked")
  public InterfaceHandler() {
    if ((this.validParents == null) && (this.validPeers == null)) {
      this.validParents = new HashSet();
      this.validParents.add(Definitions.class);


      this.validPeers = new HashSet();
      this.validPeers.add(null);
            this.validPeers.add(ItemDefinition.class);
            this.validPeers.add(Message.class);
            this.validPeers.add(Interface.class);
            this.validPeers.add(Escalation.class);

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        DynamicCommand dynamicCmd = (DynamicCommand)command;
        
        Iterator columns = dynamicCmd.getAsColumns().iterator();


        Set groups = new HashSet();
        
        //if there is no into group, just create temp metadata ids
        if (dynamicCmd.getIntoGroup() == null) {
            while (columns.hasNext()) {
                ElementSymbol column = (ElementSymbol)columns.next();

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            return doc;
        }
        
        // Get all the valid nodes to be marked as included.
        Collection validElements = ElementCollectorVisitor.getElements(select, true);
        HashSet elements = new HashSet(validElements.size());
        for (final Iterator i = validElements.iterator(); i.hasNext();) {
            final ElementSymbol element = (ElementSymbol)i.next();
            elements.add(element.getCanonicalName());
        }
        
        // keep the nodes given mark the rest of the nodes to be elementated
        return MarkExcludeVisitor.markExcludedNodes(doc, elements);
     }

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    private ObjectIDFactory defaultFactory;


    public IDGenerator() {
        this.factories = new HashMap();
        this.protocols = new HashSet();
        
        // Initialize default factory ...
        final ObjectIDFactory newDefaultFactory = new UUIDFactory();
        addFactory( newDefaultFactory );
        if ( !this.hasDefaultFactory() ) {

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            // the version
            version = ((DERInteger)content.getObjectAt(0)).getValue().intValue();


            // the digestAlgorithms
            digestalgos = new HashSet();
            Enumeration e = ((ASN1Set)content.getObjectAt(1)).getObjects();
            while (e.hasMoreElements())
            {
                ASN1Sequence s = (ASN1Sequence)e.nextElement();
                DERObjectIdentifier o = (DERObjectIdentifier)s.getObjectAt(0);

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