Examples of org.xtreemfs.babudb.index.LSMTree.rangeLookup()

org.xtreemfs.babudb.index.LSMTree.rangeLookup()
Performs a range lookup. Key-value paris are returned in an iterator in ascending key order, where only such keys are returned between from (inclusively) and to (inclusively), according to the comparator. @param from the first key (inclusively) @param to the last key (exclusively) @return an iterator with key-value pairs

        }
        
        // peform range lookups
        
        // current tree, ascending
        Iterator<Entry<byte[], byte[]>> it = tree.rangeLookup(new byte[0], new byte[0], true);
        Iterator<byte[]> itExpected = map3.values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // current tree, descending
        it = tree.rangeLookup(new byte[0], new byte[0], false);
        itExpected = map3.descendingMap().values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // snapshot 2, ascending
        it = tree.rangeLookup(new byte[0], new byte[0], snap2, true);
        itExpected = map2.values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // snapshot 2, descending
        it = tree.rangeLookup(new byte[0], new byte[0], snap2, false);
        itExpected = map2.descendingMap().values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // snapshot 1, ascending
        it = tree.rangeLookup(new byte[0], new byte[0], snap1, true);
        itExpected = map1.values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // snapshot 1, descending
        it = tree.rangeLookup(new byte[0], new byte[0], snap1, false);
        itExpected = map1.descendingMap().values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // real range lookup, current tree, ascending
        it = tree.rangeLookup("2".getBytes(), "5".getBytes(), true);
        itExpected = map3.subMap("2".getBytes(), "5".getBytes()).values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // real range lookup, current tree, descending
        it = tree.rangeLookup("5".getBytes(), "2".getBytes(), false);
        itExpected = map3.descendingMap().subMap("5".getBytes(), "2".getBytes()).values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // real (empty) range lookup, current tree, ascending
        it = tree.rangeLookup("XXXXXXXX".getBytes(), "XXXXXXXY".getBytes(), true);
        itExpected = map3.subMap("XXXXXXXX".getBytes(), true, "XXXXXXXY".getBytes(), true).values()
                .iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());
        
        // real (empty) range lookup, current tree, descending
        it = tree.rangeLookup("XXXXXXXY".getBytes(), "XXXXXXXX".getBytes(), false);
        itExpected = map3.descendingMap().subMap("XXXXXXXY".getBytes(), true, "XXXXXXXX".getBytes(), true)
                .values().iterator();
        while (it.hasNext())
            assertEquals(itExpected.next(), it.next().getValue());
        assertFalse(itExpected.hasNext());

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