Examples of org.apache.commons.collections.iterators.CollatingIterator

Package org.apache.commons.collections.iterators

Examples of org.apache.commons.collections.iterators.CollatingIterator

org.apache.commons.collections.iterators.CollatingIterator
Provides an ordered iteration over the elements contained in a collection of ordered Iterators.
Given two ordered {@link Iterator} instances A and B,the {@link #next} method on this iterator will return the lesser of A.next() and B.next(). @since Commons Collections 2.1 @version $Revision: 1.13 $ $Date: 2004/02/18 00:59:50 $ @author Rodney Waldhoff @author Stephen Colebourne

                  new CompactionController(cfs, cfs.getSSTables(), true, getDefaultGcBefore(cfs), false));
        }


        protected static CollatingIterator getCollatingIterator(Iterable<SSTableReader> sstables, Range range) throws IOException
        {
            CollatingIterator iter = FBUtilities.getCollatingIterator();
            for (SSTableReader sstable : sstables)
            {
                iter.addIterator(sstable.getDirectScanner(FILE_BUFFER_SIZE, range));
            }
            return iter;
        }

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    {
        for (SSTableIdentityIterator row : rows)
        {
            row.reset();
        }
        iter = new LazyColumnIterator(new CollatingIterator(getComparator().columnComparator, rows));
        return Iterators.filter(iter, Predicates.notNull());
    }

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                public boolean evaluate(Object row)
                {
                    return Range.isTokenInRanges(((IteratingRow)row).getKey().token, ranges);
                }
            };
            CollatingIterator iter = FBUtilities.<IteratingRow>getCollatingIterator();
            for (SSTableReader sstable : sstables)
            {
                SSTableScanner scanner = sstable.getScanner(FILE_BUFFER_SIZE);
                iter.addIterator(new FilterIterator(scanner, rangesPredicate));
            }
            return iter;
        }

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            public int compare(IColumn o1, IColumn o2)
            {
                return getComparator().compare(o1.name(), o2.name());
            }
        };
        iter = new LazyColumnIterator(new CollatingIterator(nameComparator, rows));
        return Iterators.filter(iter, Predicates.notNull());
    }

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    @SuppressWarnings("unchecked")
    protected static CollatingIterator getCollatingIterator(Iterable<SSTableReader> sstables) throws IOException
    {
        // TODO CollatingIterator iter = FBUtilities.<SSTableIdentityIterator>getCollatingIterator();
        CollatingIterator iter = FBUtilities.getCollatingIterator();
        for (SSTableReader sstable : sstables)
        {
            iter.addIterator(sstable.getDirectScanner(FILE_BUFFER_SIZE));
        }
        return iter;
    }

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    }
     */
    public static CollatingIterator getCollatingIterator()
    {
        // CollatingIterator will happily NPE if you do not specify a comparator explicitly
        return new CollatingIterator(new Comparator()
        {
            public int compare(Object o1, Object o2)
            {
                return ((Comparable) o1).compareTo(o2);
            }

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    // Note: this deserializes the response a 2nd time if getData was called first
    // (this is not currently an issue since we don't do read repair for range queries.)
    public List<Row> resolve() throws IOException
    {
        CollatingIterator collator = new CollatingIterator(new Comparator<Pair<Row,InetAddress>>()
        {
            public int compare(Pair<Row,InetAddress> o1, Pair<Row,InetAddress> o2)
            {
                return o1.left.key.compareTo(o2.left.key);
            }
        });
        
        int n = 0;
        for (Message response : responses)
        {
            RangeSliceReply reply = RangeSliceReply.read(response.getMessageBody());
            n = Math.max(n, reply.rows.size());
            collator.addIterator(new RowIterator(reply.rows.iterator(), response.getFrom()));
        }


        // for each row, compute the combination of all different versions seen, and repair incomplete versions
        ReducingIterator<Pair<Row,InetAddress>, Row> iter = new ReducingIterator<Pair<Row,InetAddress>, Row>(collator)
        {

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     * @param iterator2  the first iterators to use, not null
     * @return a combination iterator over the iterators
     * @throws NullPointerException if either iterator is null
     */
    public static Iterator collatedIterator(Comparator comparator, Iterator iterator1, Iterator iterator2) {
        return new CollatingIterator(comparator, iterator1, iterator2);
    }

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     * @param iterators  the iterators to use, not null or empty or contain nulls
     * @return a combination iterator over the iterators
     * @throws NullPointerException if iterators array is null or contains a null
     */
    public static Iterator collatedIterator(Comparator comparator, Iterator[] iterators) {
        return new CollatingIterator(comparator, iterators);
    }

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     * @return a combination iterator over the iterators
     * @throws NullPointerException if iterators collection is null or contains a null
     * @throws ClassCastException if the iterators collection contains the wrong object type
     */
    public static Iterator collatedIterator(Comparator comparator, Collection iterators) {
        return new CollatingIterator(comparator, iterators);
    }

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