Examples of com.db4o.ObjectSet

com.db4o.ObjectSet
An ObjectSet is a representation for a set of objects returned by a query.

ObjectSet extends the system collection interfaces java.util.List/System.Collections.IList where they are available. It is recommended, never to reference ObjectSet directly in code but to use List / IList instead.

Note that the underlying {@link ObjectContainer ObjectContainer} of an ObjectSetneeds to remain open as long as an ObjectSet is used. This is necessary for lazy instantiation. The objects in an ObjectSet are only instantiated when they are actually being used by the application. @see ExtObjectSet for extended functionality.

      
        query.constrain(BaseFeed.class);


        query.descend("id").constrain(feedId).equal();


        ObjectSet set = query.execute();
        if (set.size() > 1)
            throw new StorageException("Query for feed id " + feedId
                    + " returns more than one result");
        if (set.hasNext())
        return (BaseFeed<BaseFeed, BaseEntry>) set.next();
        throw new ResourceNotFoundException("can not find feed for given feed id -- "
                + feedId);


    }

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        if(accountname == null)
            throw new StorageException("Account name is null");
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feed.getId()).equal();
        ObjectSet set = query.execute();
        if (set.hasNext())
            throw new StorageException("feed with feedID " + feed.getId()
                    + " is already stored");
        GDataAccount account = getAccount(accountname);
        refreshPersistentObject(account);
        feed.setAccount(account);

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        if (feedId == null)
            throw new StorageException("can not delete feed -- feed id is null");
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId).equal();
        ObjectSet set = query.execute();
        if (set.size() > 1)
            throw new StorageException(
                    "Feed query returned not a unique result");
        if (set.size() == 0)
            throw new StorageException("no feed with feedID: " + feedId
                    + " stored -- query returned no result");


        ServerBaseFeed feed = (ServerBaseFeed) set.next();
        refreshPersistentObject(feed);
        ObjectSet entrySet = getEnriesForFeedID(feed.getId());
        try {
            this.container.delete(feed);
            this.container.delete(feed.getFeed());
            for (Object object : entrySet) {
                refreshPersistentObject(object);

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        if (LOG.isInfoEnabled())
            LOG.info("Retrieving account for account name: " + accountName);
        Query query = this.container.query();
        query.constrain(GDataAccount.class);
        query.descend("name").constrain(accountName).equal();
        ObjectSet set = query.execute();
        if (set.size() > 1)
            throw new StorageException(
                    "Account query returned not a unique result -- account name: "
                            + accountName);
        if (!set.hasNext())
            throw new ResourceNotFoundException(
                    "No such account stored -- query returned not result for account name: "
                            + accountName);


        return (GDataAccount) set.next();
    }

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        assertTrue(dbFile.delete());
    }


    private void clearDB() {
        ObjectContainer container = this.controller.releaseContainer();
        ObjectSet set = container.get(new Object());


        for (Object object : set) {
            container.delete(object);
        }
        container.ext().purge();

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        storage = this.controller.getStorage();
        Query query = getContainer().query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e.getId());
        ObjectSet resultSet = query.execute();
        assertEquals(1, resultSet.size());
        BaseEntry storedEntry = (BaseEntry) resultSet.next();
        assertEquals("1", storedEntry.getVersionId());


        ServerBaseFeed bFeed = new ServerBaseFeed();
        bFeed.setItemsPerPage(25);
        bFeed.setId(FEEDID);

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        container.close();
        container = getContainer();
        Query query = container.query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e.getId());
        ObjectSet resultSet = query.execute();
        assertEquals(0, resultSet.size());


        // #### test version matching
        ServerBaseEntry eVersion = createServerBaseEntry();
        storage.storeEntry(eVersion);
        eVersion.setVersion(33);
        try {
            storage.deleteEntry(eVersion);
            fail("version does not match");
        } catch (Exception ex) {
            // TODO: handle exception
        }
        try {
            storage.deleteEntry(null);
            fail("entry id is null");
        } catch (Exception ex) {
            // TODO: handle exception
        }
        storage = this.controller.getStorage();
        storage.deleteEntry(e1);
        container.close();
        container = getContainer();
        query = container.query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e1.getId());
        resultSet = query.execute();
        assertEquals(0, resultSet.size());


        // ############ test concurrency


        // ############ test concurrency
        Object monitor = new Object();

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        storage.updateEntry(e2);
        ObjectContainer container = getContainer();
        Query query = container.query();
        query.constrain(BaseEntry.class);
        query.descend("id").constrain(e.getId());
        ObjectSet resultSet = query.execute();
        assertEquals(1, resultSet.size());
        BaseEntry result = (BaseEntry) resultSet.next();
        assertEquals("new", result.getTitle().getPlainText());
        assertEquals("2", result.getVersionId());


        ServerBaseFeed bFeed = new ServerBaseFeed();
        bFeed.setItemsPerPage(25);

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        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())
                .getPassword());
        try {
            storage.storeAccount(account);
            fail("Account already stored");
        } catch (Exception e) {

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        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())
                .getPassword());
        account = new GDataAccount();
        account.setName("simon");
        account.setPassword("newPass");
        storage.updateAccount(account);
        container.close();
        container = getContainer();
        q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())
                .getPassword());
        container.close();
    }

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