Examples of com.db4o.query.Query.constrain()

com.db4o.query.Query.constrain()
adds a constraint to this node.

If the constraint contains attributes that are not yet present in the query graph, the query graph is extended accordingly.

Special behaviour for:
- class {@link Class}: confine the result to objects of one class or to objects implementing an interface.
- interface {@link Evaluation}: run evaluation callbacks against all candidates.
@param constraint the constraint to be added to this Query. @return {@link Constraint} a new {@link Constraint} for thisquery node or null for objects implementing the {@link Evaluation} interface.

    /* Assert Folders, Bookmarks and Searchmarks */
    List<IFolder> folders = db.query(IFolder.class);
    assertEquals(folders.size(), defragmentedDb.query(IFolder.class).size());
    for (IFolder folder : folders) {
      Query query = defragmentedDb.query();
      query.constrain(folder.getClass());
      query.descend("fId").constrain(Long.valueOf(folder.getId())); //$NON-NLS-1$


      List<IFolder> result = query.execute();
      assertEquals(1, result.size());

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    /* Assert Preference */
    List<IPreference> preferences = db.query(IPreference.class);
    assertEquals(preferences.size(), defragmentedDb.query(IPreference.class).size());
    for (IPreference preference : preferences) {
      Query query = defragmentedDb.query();
      query.constrain(preference.getClass());
      query.descend("fId").constrain(Long.valueOf(preference.getId())); //$NON-NLS-1$


      List<IPreference> result = query.execute();
      assertEquals(1, result.size());

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    /* Assert Label */
    List<ILabel> labels = db.query(ILabel.class);
    assertEquals(labels.size(), defragmentedDb.query(ILabel.class).size());
    for (ILabel label : labels) {
      Query query = defragmentedDb.query();
      query.constrain(label.getClass());
      query.descend("fId").constrain(Long.valueOf(label.getId())); //$NON-NLS-1$


      List<INewsBin> result = query.execute();
      assertEquals(1, result.size());
      assertTrue(((Label) label).isIdentical((ILabel) result.get(0)));

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    /* Assert Search Filter */
    List<ISearchFilter> filters = db.query(ISearchFilter.class);
    assertEquals(filters.size(), defragmentedDb.query(ISearchFilter.class).size());
    for (ISearchFilter filter : filters) {
      Query query = defragmentedDb.query();
      query.constrain(filter.getClass());
      query.descend("fId").constrain(Long.valueOf(filter.getId())); //$NON-NLS-1$


      List<INewsBin> result = query.execute();
      assertEquals(1, result.size());

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    /* Assert Conditional Get */
    List<IConditionalGet> condGets = db.query(IConditionalGet.class);
    assertEquals(condGets.size(), defragmentedDb.query(IConditionalGet.class).size());
    for (IConditionalGet condGet : condGets) {
      Query query = defragmentedDb.query();
      query.constrain(condGet.getClass());
      query.descend("fLink").constrain(condGet.getLink().toString()); //$NON-NLS-1$


      List<IConditionalGet> result = query.execute();
      assertEquals(1, result.size());

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  }


  public Collection<IFolder> loadRoots() {
    try {
      Query query = fDb.query();
      query.constrain(fEntityClass);
      query.descend("fParent").constrain(null); //$NON-NLS-1$
      List<IFolder> folders = getList(query);
      activateAll(folders);
      return new ArrayList<IFolder>(folders);
    } catch (Db4oException e) {

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    }
  }


  private List<T> loadList(long id) throws Db4oException   {
    Query query = fDb.query();
    query.constrain(fEntityClass);
    query.descend("fId").constrain(Long.valueOf(id)); //$NON-NLS-1$
    return getList(query);
  }


  @Override

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    }
  }


  public ISearchMark load(ISearchCondition searchCondition) {
    Query query = fDb.query();
    query.constrain(fEntityClass);
    query.descend("fSearchConditions").constrain(searchCondition); //$NON-NLS-1$
    return getSingleResult(query);
  }


  public void visited(ISearchMark mark) {

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    super(Description.class, true);
  }


  public Description load(long newsId) {
    Query query = fDb.query();
    query.constrain(Description.class);
    query.descend("fNewsId").constrain(newsId); //$NON-NLS-1$
    Description description = getSingleResult(query);
    fDb.activate(description, Integer.MAX_VALUE);
    return description;
  }

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  public IConditionalGet load(URI link) {
    Assert.isNotNull(link, "link cannot be null"); //$NON-NLS-1$
    try {
      Query query = fDb.query();
      query.constrain(fEntityClass);
      query.descend("fLink").constrain(link.toString()); //$NON-NLS-1$


      for (IConditionalGet entity : getList(query)) {
        fDb.activate(entity, Integer.MAX_VALUE);
        return entity;

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