Examples of com.orientechnologies.orient.core.index.OIndexCursor

Package com.orientechnologies.orient.core.index

Examples of com.orientechnologies.orient.core.index.OIndexCursor

com.orientechnologies.orient.core.index.OIndexCursor
Presentation of OrientDB index cursor for point and range queries. Cursor may iterate by several elements even if you do point query (query by single key). It is possible if you use not unique index. Contract of cursor is simple it iterates in some subset of index data till it reaches it's borders in such case {@link #nextEntry()} returns null.Cursor is created as result of index query method such as {@link com.orientechnologies.orient.core.index.OIndex#iterateEntriesBetween(Object,boolean,Object,boolean,boolean)} cursorinstance can not be used at several threads simultaneously. @author Andrey Lomakin Andrey Lomakin @since 4/4/14


    database.commit();


    Assert.assertNull(database.getTransaction().getIndexChanges("idxTxAwareOneValueGetValuesTest"));
    Set<OIdentifiable> resultOne = new HashSet<OIdentifiable>();
    OIndexCursor cursor = index.iterateEntries(Arrays.asList(1, 2), true);
    cursorToSet(cursor, resultOne);
    Assert.assertEquals(resultOne.size(), 2);


    database.begin();

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    index.put(1, new ORecordId(clusterId, OClusterPositionFactory.INSTANCE.valueOf(1)));
    index.put(2, new ORecordId(clusterId, OClusterPositionFactory.INSTANCE.valueOf(2)));


    Assert.assertNotNull(database.getTransaction().getIndexChanges("idxTxAwareOneValueGetValuesTest"));
    Set<OIdentifiable> result = new HashSet<OIdentifiable>();
    OIndexCursor cursor = index.iterateEntries(Arrays.asList(1, 2), true);
    cursorToSet(cursor, result);


    Assert.assertEquals(result.size(), 2);


    database.commit();

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    index.put(2, new ORecordId(clusterId, OClusterPositionFactory.INSTANCE.valueOf(2)));


    Assert.assertNotNull(database.getTransaction().getIndexChanges("idxTxAwareOneValueGetValuesTest"));


    Set<OIdentifiable> result = new HashSet<OIdentifiable>();
    OIndexCursor cursor = index.iterateEntries(Arrays.asList(1, 2), true);
    cursorToSet(cursor, result);


    Assert.assertEquals(result.size(), 2);
    database.commit();

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    index.remove(1);


    Assert.assertNotNull(database.getTransaction().getIndexChanges("idxTxAwareOneValueGetValuesTest"));
    Set<OIdentifiable> result = new HashSet<OIdentifiable>();
    OIndexCursor cursor = index.iterateEntries(Arrays.asList(1, 2), true);
    cursorToSet(cursor, result);
    Assert.assertEquals(result.size(), 1);


    database.commit();

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    index.remove(1, null);


    Assert.assertNotNull(database.getTransaction().getIndexChanges("idxTxAwareOneValueGetValuesTest"));
    Set<OIdentifiable> result = new HashSet<OIdentifiable>();
    OIndexCursor cursor = index.iterateEntries(Arrays.asList(1, 2), true);
    cursorToSet(cursor, result);
    Assert.assertEquals(result.size(), 1);


    database.commit();

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    index.remove(1, new ORecordId(clusterId, OClusterPositionFactory.INSTANCE.valueOf(1)));
    index.put(1, new ORecordId(clusterId, OClusterPositionFactory.INSTANCE.valueOf(1)));


    Assert.assertNotNull(database.getTransaction().getIndexChanges("idxTxAwareOneValueGetValuesTest"));
    Set<OIdentifiable> result = new HashSet<OIdentifiable>();
    OIndexCursor cursor = index.iterateEntries(Arrays.asList(1, 2), true);
    cursorToSet(cursor, result);


    Assert.assertEquals(result.size(), 2);


    database.commit();

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    for (Object in:indices){
      OIndex i = (OIndex)in;
      if (indicesName.contains(i.getName())){
        //migrate the index
        Logger.info("....." + i.getName());
        OIndexCursor cursor = i.cursor();
        Set<Entry<Object, OIdentifiable>> entries = cursor.toEntries();
        Iterator<Entry<Object, OIdentifiable>> it = entries.iterator();
        while (it.hasNext()){
          Entry<Object, OIdentifiable> entry = it.next();
          String key = (String) entry.getKey();
          Object valueOnDb=entry.getValue();

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        for (Comparable currentKey : currentKeys) {
          final List<OIdentifiable> currentResult = getFromCompositeIndex(currentKey, currentIndex);
          newKeys.addAll(prepareKeys(nextIndex, currentResult));
        }
      } else {
        final OIndexCursor cursor = currentIndex.iterateEntries(currentKeys, true);
        final List<OIdentifiable> keys = cursorToList(cursor);
        newKeys = prepareKeys(nextIndex, keys);
      }


      updateStatistic(currentIndex);

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      result = new ArrayList<OIdentifiable>();
      for (Comparable key : currentKeys) {
        result.addAll(getFromCompositeIndex(key, firstIndex));
      }
    } else {
      final OIndexCursor cursor = firstIndex.iterateEntries(currentKeys, true);


      result = cursorToList(cursor);
    }


    updateStatistic(firstIndex);

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    return result;
  }


  private List<OIdentifiable> getFromCompositeIndex(Comparable currentKey, OIndex<?> currentIndex) {
    final OIndexCursor cursor = currentIndex.iterateEntriesBetween(currentKey, true, currentKey, true, true);


    return cursorToList(cursor);
  }

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