treeset.java

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

     * @return <tt>true</tt> if this set changed as a result of the call.
     *
     * @throws ClassCastException if the elements provided cannot be compared
     *		  with the elements currently in the set.
     * @throws NullPointerException of the specified collection is null.
     */
    public boolean addAll(Collection c) {
        // Use linear-time version if applicable
        if (m.size()==0 && c.size() > 0 && c instanceof SortedSet && 
            m instanceof TreeMap) {
            SortedSet set = (SortedSet)c;
            TreeMap map = (TreeMap)m;
            Comparator cc = set.comparator();
            Comparator mc = map.comparator();
            if (cc==mc || (cc != null && cc.equals(mc))) {
                map.addAllForTreeSet(set, PRESENT);
                return true;
            }
        }
        return super.addAll(c);
    }

    /**
     * Returns a view of the portion of this set whose elements range from
     * <tt>fromElement</tt>, inclusive, to <tt>toElement</tt>, exclusive.  (If
     * <tt>fromElement</tt> and <tt>toElement</tt> are equal, the returned
     * sorted set is empty.)  The returned sorted set is backed by this set,
     * so changes in the returned sorted set are reflected in this set, and
     * vice-versa.  The returned sorted set supports all optional Set
     * operations.<p>
     *
     * The sorted set returned by this method will throw an
     * <tt>IllegalArgumentException</tt> if the user attempts to insert an
     * element outside the specified range.<p>
     *
     * Note: this method always returns a <i>half-open range</i> (which
     * includes its low endpoint but not its high endpoint).  If you need a
     * <i>closed range</i> (which includes both endpoints), and the element
     * type allows for calculation of the successor of a specified value,
     * merely request the subrange from <tt>lowEndpoint</tt> to
     * <tt>successor(highEndpoint)</tt>.  For example, suppose that <tt>s</tt>
     * is a sorted set of strings.  The following idiom obtains a view
     * containing all of the strings in <tt>s</tt> from <tt>low</tt> to
     * <tt>high</tt>, inclusive: <pre>
     *     SortedSet sub = s.subSet(low, high+"\0");
     * </pre>
     * 
     * A similar technique can be used to generate an <i>open range</i> (which
     * contains neither endpoint).  The following idiom obtains a view
     * containing all of the strings in <tt>s</tt> from <tt>low</tt> to
     * <tt>high</tt>, exclusive: <pre>
     *     SortedSet sub = s.subSet(low+"\0", high);
     * </pre>
     *
     * @param fromElement low endpoint (inclusive) of the subSet.
     * @param toElement high endpoint (exclusive) of the subSet.
     * @return a view of the portion of this set whose elements range from
     * 	       <tt>fromElement</tt>, inclusive, to <tt>toElement</tt>,
     * 	       exclusive.
     * @throws ClassCastException if <tt>fromElement</tt> and
     *         <tt>toElement</tt> cannot be compared to one another using
     *         this set's comparator (or, if the set has no comparator,
     *         using natural ordering).
     * @throws IllegalArgumentException if <tt>fromElement</tt> is greater than
     *         <tt>toElement</tt>.
     * @throws NullPointerException if <tt>fromElement</tt> or
     *	       <tt>toElement</tt> is <tt>null</tt> and this set uses natural
     *	       order, or its comparator does not tolerate <tt>null</tt>
     *         elements.
     */
    public SortedSet subSet(Object fromElement, Object toElement) {
	return new TreeSet(m.subMap(fromElement, toElement));
    }

    /**
     * Returns a view of the portion of this set whose elements are strictly
     * less than <tt>toElement</tt>.  The returned sorted set is backed by
     * this set, so changes in the returned sorted set are reflected in this
     * set, and vice-versa.  The returned sorted set supports all optional set
     * operations.<p>
     *
     * The sorted set returned by this method will throw an
     * <tt>IllegalArgumentException</tt> if the user attempts to insert an
     * element greater than or equal to <tt>toElement</tt>.<p>
     *
     * Note: this method always returns a view that does not contain its
     * (high) endpoint.  If you need a view that does contain this endpoint,
     * and the element type allows for calculation of the successor of a
     * specified value, merely request a headSet bounded by
     * <tt>successor(highEndpoint)</tt>.  For example, suppose that <tt>s</tt>
     * is a sorted set of strings.  The following idiom obtains a view
     * containing all of the strings in <tt>s</tt> that are less than or equal
     * to <tt>high</tt>: <pre> SortedSet head = s.headSet(high+"\0");</pre>
     *
     * @param toElement high endpoint (exclusive) of the headSet.
     * @return a view of the portion of this set whose elements are strictly
     * 	       less than toElement.
     * @throws ClassCastException if <tt>toElement</tt> is not compatible
     *         with this set's comparator (or, if the set has no comparator,
     *         if <tt>toElement</tt> does not implement <tt>Comparable</tt>).
     * @throws IllegalArgumentException if this set is itself a subSet,
     *         headSet, or tailSet, and <tt>toElement</tt> is not within the
     *         specified range of the subSet, headSet, or tailSet.
     * @throws NullPointerException if <tt>toElement</tt> is <tt>null</tt> and
     *	       this set uses natural ordering, or its comparator does
     *         not tolerate <tt>null</tt> elements.
     */
    public SortedSet headSet(Object toElement) {
	return new TreeSet(m.headMap(toElement));
    }

    /**
     * Returns a view of the portion of this set whose elements are
     * greater than or equal to <tt>fromElement</tt>.  The returned sorted set
     * is backed by this set, so changes in the returned sorted set are
     * reflected in this set, and vice-versa.  The returned sorted set
     * supports all optional set operations.<p>
     *
     * The sorted set returned by this method will throw an
     * <tt>IllegalArgumentException</tt> if the user attempts to insert an
     * element less than <tt>fromElement</tt>.
     *
     * Note: this method always returns a view that contains its (low)
     * endpoint.  If you need a view that does not contain this endpoint, and
     * the element type allows for calculation of the successor of a specified
     * value, merely request a tailSet bounded by
     * <tt>successor(lowEndpoint)</tt>.  For example, suppose that <tt>s</tt>
     * is a sorted set of strings.  The following idiom obtains a view
     * containing all of the strings in <tt>s</tt> that are strictly greater
     * than <tt>low</tt>: <pre>
     *     SortedSet tail = s.tailSet(low+"\0");
     * </pre>
     *
     * @param fromElement low endpoint (inclusive) of the tailSet.
     * @return a view of the portion of this set whose elements are
     * 	       greater than or equal to <tt>fromElement</tt>.
     * @throws ClassCastException if <tt>fromElement</tt> is not compatible
     *         with this set's comparator (or, if the set has no comparator,
     *         if <tt>fromElement</tt> does not implement <tt>Comparable</tt>).
     * @throws IllegalArgumentException if this set is itself a subSet,
     *         headSet, or tailSet, and <tt>fromElement</tt> is not within the
     *         specified range of the subSet, headSet, or tailSet.
     * @throws NullPointerException if <tt>fromElement</tt> is <tt>null</tt>
     *	       and this set uses natural ordering, or its comparator does
     *         not tolerate <tt>null</tt> elements.
     */
    public SortedSet tailSet(Object fromElement) {
	return new TreeSet(m.tailMap(fromElement));
    }

    /**
     * Returns the comparator used to order this sorted set, or <tt>null</tt>
     * if this tree set uses its elements natural ordering.
     *
     * @return the comparator used to order this sorted set, or <tt>null</tt>
     * if this tree set uses its elements natural ordering.
     */
    public Comparator comparator() {
        return m.comparator();
    }

    /**
     * Returns the first (lowest) element currently in this sorted set.
     *
     * @return the first (lowest) element currently in this sorted set.
     * @throws    NoSuchElementException sorted set is empty.
     */
    public Object first() {
        return m.firstKey();
    }

    /**
     * Returns the last (highest) element currently in this sorted set.
     *
     * @return the last (highest) element currently in this sorted set.
     * @throws    NoSuchElementException sorted set is empty.
     */
    public Object last() {
        return m.lastKey();
    }

    /**
     * Returns a shallow copy of this <tt>TreeSet</tt> instance. (The elements
     * themselves are not cloned.)
     *
     * @return a shallow copy of this set.
     */
    public Object clone() {
        TreeSet clone = null;
	try { 
	    clone = (TreeSet)super.clone();
	} catch (CloneNotSupportedException e) { 
	    throw new InternalError();
	}

        clone.m = new TreeMap(m);
        clone.keySet = clone.m.keySet();

        return clone;
    }

    /**
     * Save the state of the <tt>TreeSet</tt> instance to a stream (that is,
     * serialize it).
     *
     * @serialData Emits the comparator used to order this set, or
     *		   <tt>null</tt> if it obeys its elements' natural ordering
     *		   (Object), followed by the size of the set (the number of
     *		   elements it contains) (int), followed by all of its
     *		   elements (each an Object) in order (as determined by the
     *		   set's Comparator, or by the elements' natural ordering if
     *             the set has no Comparator).
     */
    private void writeObject(java.io.ObjectOutputStream s)
        throws java.io.IOException {
	// Write out any hidden stuff
	s.defaultWriteObject();

        // Write out Comparator
        s.writeObject(m.comparator());

        // Write out size
        s.writeInt(m.size());

	// Write out all elements in the proper order.
	for (Iterator i=m.keySet().iterator(); i.hasNext(); )
            s.writeObject(i.next());
    }

    /**
     * Reconstitute the <tt>TreeSet</tt> instance from a stream (that is,
     * deserialize it).
     */
    private void readObject(java.io.ObjectInputStream s)
        throws java.io.IOException, ClassNotFoundException {
	// Read in any hidden stuff
	s.defaultReadObject();

        // Read in Comparator
        Comparator c = (Comparator)s.readObject();

        // Create backing TreeMap and keySet view
        m = (c==null ? new TreeMap() : new TreeMap(c));
        keySet = m.keySet();

        // Read in size
        int size = s.readInt();

        ((TreeMap)m).readTreeSet(size, s, PRESENT);
    }

    private static final long serialVersionUID = -2479143000061671589L;
}