Examples of org.odmg.DList

org.odmg.DList
The ODMG List collection. A DList collection is an ordered collection that provides efficient insertion and removal of elements at arbitrary positions in the list, but it also supports indexed access. The beginning index value is 0. When an element is added at a given position in the list, the index of all subsequent elements is increased by 1. Similarly, when an element is removed from the list, the index of all subsequent elements is decreased by 1.
All of the operations defined by the JavaSoft List interface are supported by an ODMG implementation of DList, the exception UnsupportedOperationException is not thrown when a call is made to any of the List methods. @author David Jordan (as Java Editor of the Object Data Management Group) @version ODMG 3.0

     * for the predicate, otherwise false.
     * @exception  org.odmg.QueryInvalidException  The query predicate is invalid.
     */
    public boolean existsElement(String predicate) throws org.odmg.QueryInvalidException
    {
        DList results = (DList) this.query(predicate);
        if (results == null || results.size() == 0)
            return false;
        else
            return true;
    }

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        predicateQuery.create(oql);
        Query pQ = ((OQLQueryImpl) predicateQuery).getQuery();
        Criteria pCrit = pQ.getCriteria();


        PBCapsule handle = new PBCapsule(pbKey, tx);
        DList result;
        try
        {
            PersistenceBroker broker = handle.getBroker();
            Criteria allElementsCriteria = this.getPkCriteriaForAllElements(broker);
            // join selection of elements with predicate criteria:

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     * for the predicate, otherwise false.
     * @exception  org.odmg.QueryInvalidException  The query predicate is invalid.
     */
    public boolean existsElement(String predicate) throws org.odmg.QueryInvalidException
    {
        DList results = (DList) this.query(predicate);
        if (results == null || results.size() == 0)
            return false;
        else
            return true;
    }

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        final String name = "testAdding_" + System.currentTimeMillis();


        TransactionExt tx = (TransactionExt) odmg.newTransaction();
        tx.begin();
        // create DList and bound by name
        DList list = odmg.newDList();
        database.bind(list, name);
        tx.commit();


        tx.begin();
        tx.getBroker().clearCache();
        Object obj = database.lookup(name);
        tx.commit();
        assertNotNull("binded DList not found", obj);


        tx.begin();
        // add objects to list
        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }
        tx.commit();


        // check current list
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            assertNotNull(a);
        }


        tx.begin();
        tx.getBroker().clearCache();


        // lookup list and check entries
        DList lookedUp = (DList) database.lookup(name);
        assertNotNull("binded DList not found", lookedUp);


        //System.out.println("sequence of items in lookedup list:");
        iter = lookedUp.iterator();
        Iterator iter1 = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            DObject b = (DObject) iter1.next();
            assertNotNull(a);
            assertNotNull(b);
            assertEquals(a.getId(), b.getId());
        }
        tx.commit();


        // add new entries to list
        tx.begin();
        for (int i = 0; i < 3; i++)
        {
            DObject a = createObject(name + "_new_entry");
            list.add(a);
        }
        tx.commit();


        tx.begin();
        tx.getBroker().clearCache();
        lookedUp = (DList) database.lookup(name);
        iter = lookedUp.iterator();
        iter1 = list.iterator();
        assertEquals("Wrong number of DListEntry found", 8, list.size());
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();

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        final String name = "testRemoveAdd_" + System.currentTimeMillis();


        TransactionExt tx = (TransactionExt) odmg.newTransaction();
        tx.begin();
        // create DList and bound by name
        DList list = odmg.newDList();
        database.bind(list, name);


        // add object to list
        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }
        tx.commit();


        // check current list
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            assertNotNull(a);
        }


        tx.begin();
        tx.getBroker().clearCache();


        // lookup list and check entries
        DList lookedUp = (DList) database.lookup(name);
        assertNotNull("binded DList not found", lookedUp);


        //System.out.println("sequence of items in lookedup list:");
        iter = lookedUp.iterator();
        Iterator iter1 = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            DObject b = (DObject) iter1.next();
            assertNotNull(a);
            assertNotNull(b);
            assertEquals(a.getId(), b.getId());
        }
        tx.commit();


        // add and remove new entries
        tx.begin();
        for (int i = 0; i < 3; i++)
        {
            DObject a = createObject(name + "_new_entry_NOT_PERSIST");
            list.add(a);
            list.remove(list.size()-1);
        }
        tx.commit();




        tx.begin();
        tx.getBroker().clearCache();
        lookedUp = (DList) database.lookup(name);
        iter = lookedUp.iterator();
        iter1 = list.iterator();
        assertEquals("Wrong number of DListEntry found", 5, list.size());
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            DObject b = (DObject) iter1.next();
            assertNotNull(a);
            assertNotNull(b);
            assertEquals(a.getId(), b.getId());
        }
        tx.commit();
        assertNotNull("binded DList not found", lookedUp);




        tx.begin();
        for (int i = 0; i < 3; i++)
        {
            DObject a = createObject(name + "_new_entry_new_persist");
            list.add(a);
            list.remove(0);
        }
        tx.commit();


        tx.begin();
        tx.getBroker().clearCache();
        lookedUp = (DList) database.lookup(name);
        iter = lookedUp.iterator();
        iter1 = list.iterator();
        assertEquals("Wrong number of DListEntry found", 5, list.size());
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();

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    {
        // create a unique name:
        final String name = "testAdding_" + System.currentTimeMillis();


        // get DList and fill with objects
        DList list = odmg.newDList();
        Transaction tx = odmg.newTransaction();
        tx.begin();
        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }
        // bind the new list
        database.bind(list, name);
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        Object obj = database.lookup(name);
        tx.commit();
        assertNotNull("binded DList not found", obj);


        // iterate list
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            assertNotNull(a);
        }
        assertEquals(5, list.size());


        tx = odmg.newTransaction();
        tx.begin();
        ((TransactionExt) odmg.currentTransaction()).getBroker().clearCache();
        DList lookedUp = (DList) database.lookup(name);
        tx.commit();
        assertNotNull("binded DList not found", lookedUp);


        //System.out.println("sequence of items in lookedup list:");
        iter = lookedUp.iterator();
        Iterator iter1 = list.iterator();
        while (iter.hasNext())
        {
            DObject a = (DObject) iter.next();
            DObject b = (DObject) iter1.next();

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        // create a unique name:
        String name = "testRemoving_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        DList list = odmg.newDList();
        // bind the list to the name:
        database.bind(list, name);


        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }
        assertEquals(5, list.size());
        tx.commit();


        // delete two items
        tx = odmg.newTransaction();
        tx.begin();
        ((HasBroker) odmg.currentTransaction()).getBroker().clearCache();
        DList lookedUp = (DList) database.lookup(name);
        assertNotNull("database lookup does not find the named DList", lookedUp);
        assertEquals("Wrong number of list entries", 5, lookedUp.size());
        lookedUp.remove(2);
        lookedUp.remove(1);
        tx.commit();


        // check if deletion was successful
        tx = odmg.newTransaction();
        tx.begin();
        ((HasBroker) odmg.currentTransaction()).getBroker().clearCache();
        lookedUp = (DList) database.lookup(name);
        tx.commit();


        assertEquals(3, lookedUp.size());
    }

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        // create a unique name:
        String name = "testAddingWithIndex_" + System.currentTimeMillis();


        Transaction tx = odmg.newTransaction();
        tx.begin();
        DList list = odmg.newDList();
        database.bind(list, name);
        tx.commit();


        tx = odmg.newTransaction();
        tx.begin();
        for (int i = 0; i < 5; i++)
        {
            DObject a = createObject(name);
            list.add(a);
        }


        list.add(2, createObject(name+"_pos2"));
        list.add(0, createObject(name+"_pos0"));
        list.add(7, createObject(name+"_pos7"));
        tx.commit();


        tx.begin();
        ((TransactionImpl) tx).getBroker().clearCache();
        // System.out.println("list: " + list);
        // System.out.println("lookup list: " + db.lookup(name));
        tx.commit();


        //System.out.println("sequence of items in list:");
        Iterator iter = list.iterator();
        DObject a;
        while (iter.hasNext())
        {
            a = (DObject) iter.next();
            assertNotNull(a);
            //System.out.print(a.getArticleId() + ", ");
        }




        tx = odmg.newTransaction();
        tx.begin();
        ((TransactionImpl) tx).getBroker().clearCache();
        DList lookedUp = (DList) database.lookup(name);
        // System.out.println("lookup list: " + lookedUp);
        assertNotNull("database lookup does not find DList", lookedUp);
        assertEquals(8, lookedUp.size());
        iter = lookedUp.iterator();
        while (iter.hasNext())
        {
            a = (DObject) iter.next();
        }
        tx.commit();

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        OQLQuery query = impl.newOQLQuery();


        query.create("select products from " + Product.class.getName() + " where name = $1");
        query.bind(name);


        DList   results = (DList)query.execute();
        Product product = (Product)results.iterator().next();


        tx.commit();
        return product;
    }

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            // 3. set the OQL select statement
            query.create("select allproducts from " + Product.class.getName());


            // 4. perform the query and store the result in a persistent Collection
            DList allProducts = (DList) query.execute();


            tx.commit();


            // 5. now iterate over the result to print each product
            for (Iterator iter = allProducts.iterator(); iter.hasNext();)
            {
                System.out.println(iter.next());
            }
        }
        catch (Throwable t)

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