Examples of java.util.AbstractSet

java.util.AbstractSet
This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
The process of implementing a set by extending this class is identical to that of implementing a Collection by extending AbstractCollection, except that all of the methods and constructors in subclasses of this class must obey the additional constraints imposed by the Set interface (for instance, the add method must not permit addition of multiple instances of an object to a set).
Note that this class does not override any of the implementations from the AbstractCollection class. It merely adds implementations for equals and hashCode.
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 1.29, 04/21/06 @see Collection @see AbstractCollection @see Set @since 1.2

         return size() == 0;
      }


      public Set keySet()
      {
         return new AbstractSet()
         {


            @Override
            public Iterator iterator()
            {

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    super();
    this.servletContext = servletContext;
  }


  public Set entrySet() {
    return new AbstractSet() {


      public Iterator iterator() {
        return new Iterator() {
          private Enumeration initNames = servletContext.getInitParameterNames();

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  /**
   * @see java.util.Map#keySet()
   */
  public Set keySet()
  {
    return new AbstractSet()
    {
      public Iterator iterator()
      {
        return new Iterator()
        {

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  /**
   * @see java.util.Map#entrySet()
   */
  public Set entrySet()
  {
    return new AbstractSet()
    {
      public Iterator iterator()
      {
        return new Iterator()
        {

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     * 
     * @return BeanMap mappings.  The Set returned by this method
     *         is not modifiable.
     */
    public Set entrySet() {
        return Collections.unmodifiableSet(new AbstractSet() {
            public Iterator iterator() {
                return new Iterator() {


                    Iterator methodIter = 
                      BeanMap.this.readMethods.keySet().iterator();

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            throw new UnmarshallException("Could not read javaClass", e);
        }
        if (java_class == null) {
            throw new UnmarshallException("no type hint");
        }
        AbstractSet abset = null;
        if (java_class.equals("java.util.Set") || java_class.equals("java.util.AbstractSet") || java_class.equals("java.util.HashSet")) {
            abset = new HashSet();
        } else if (java_class.equals("java.util.TreeSet")) {
            abset = new TreeSet();
        } else if (java_class.equals("java.util.LinkedHashSet")) {
            abset = new LinkedHashSet();
        } else {
            throw new UnmarshallException("not a Set");
        }
        JSONObject jsonset;
        try {
            jsonset = jso.getJSONObject("set");
        } catch (JSONException e) {
            throw new UnmarshallException("set missing", e);
        }


        if (jsonset == null) {
            throw new UnmarshallException("set missing");
        }


        Iterator i = jsonset.keys();
        String key = null;
        state.setSerialized(o, abset);
        try {
            while (i.hasNext()) {
                key = (String) i.next();
                Object setElement = jsonset.get(key);
                abset.add(_ser.unmarshall(state, null, setElement));
            }
        } catch (UnmarshallException e) {
            throw new UnmarshallException("key " + i + e.getMessage(), e);
        } catch (JSONException e) {
            throw new UnmarshallException("key " + key + " " + e.getMessage(), e);

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    sentinel.prev = sentinel;
  }


  // per Map.keySet()
  public Set keySet() {
    return new AbstractSet() {


      // required impls
      public Iterator iterator() { return new OrderedIterator(KEY); }
      public boolean remove(Object o) {
        return SequencedHashMap.this.remove(o) != null;

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    };
  }


  // per Map.entrySet()
  public Set entrySet() {
    return new AbstractSet() {
      // helper
      private Entry findEntry(Object o) {
        if(o == null) return null;
        if(!(o instanceof Map.Entry)) return null;

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     * Each MapEntry can be set but not removed.
     * 
     * @return the unmodifiable set of mappings
     */
    public Set entrySet() {
        return UnmodifiableSet.decorate(new AbstractSet() {
            public Iterator iterator() {
                return entryIterator();
            }
            public int size() {
              return BeanMap.this.readMethods.size();

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     * @return a set view of the mappings contained in this map.
     */
    public Set entrySetByValue() {


        if (setOfEntries[VALUE] == null) {
            setOfEntries[VALUE] = new AbstractSet() {


                public Iterator iterator() {


                    return new DoubleOrderedMapIterator(VALUE) {

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