Examples of org.exist.storage.dom.DOMFile$FindCallback

org.exist.storage.dom.DOMFile
This represents an overflow page. Overflow pages are created if the node data exceeds the size of one page. An overflow page is a sequence of DOMPages. @author wolf

     *
     * @param doc the document object to check
     * @return
     */
    public ErrorReport checkDocument(final DocumentImpl doc) {
        final DOMFile domDb = ( (NativeBroker)broker ).getDOMFile();
        return (ErrorReport)new DOMTransaction( this, domDb, Lock.WRITE_LOCK, doc ) {
            public Object start() {
                EmbeddedXMLStreamReader reader = null;
                try {
                    final ElementImpl root = (ElementImpl)doc.getDocumentElement();

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     *
     * @return  null if the document is consistent, an error report otherwise.
     */
    public ErrorReport checkXMLTree( final DocumentImpl doc )
    {
        final DOMFile domDb = ( (NativeBroker)broker ).getDOMFile();
        return( (ErrorReport)new DOMTransaction( this, domDb, Lock.WRITE_LOCK, doc ) {
                    public Object start() {
                        EmbeddedXMLStreamReader reader = null;
                        try {
                            final ElementImpl             root            = (ElementImpl)doc.getDocumentElement();
                            reader = broker.getXMLStreamReader( root, true );
                            NodeId                  nodeId;
                            boolean                 attribsAllowed  = false;
                            int                     expectedAttribs = 0;
                            int                     attributeCount  = 0;


                            while( reader.hasNext() ) {
                                final int status = reader.next();


                                nodeId = (NodeId)reader.getProperty( EmbeddedXMLStreamReader.PROPERTY_NODE_ID );
                                ElementNode parent = null;


                                if( ( status != XMLStreamReader.END_ELEMENT ) && !elementStack.isEmpty() ) {
                                    parent = elementStack.peek();
                                    parent.childCount++;


                                    // test parent-child relation
                                    if( !nodeId.isChildOf( parent.elem.getNodeId() ) ) {
                                        return( new ErrorReport.ResourceError( ErrorReport.NODE_HIERARCHY, "Node " + nodeId + " is not a child of " + parent.elem.getNodeId() ) );
                                    }


                                    // test sibling relation
                                    if( ( parent.prevSibling != null ) && !( nodeId.isSiblingOf( parent.prevSibling ) && ( nodeId.compareTo( parent.prevSibling ) > 0 ) ) ) {
                                        return( new ErrorReport.ResourceError( ErrorReport.INCORRECT_NODE_ID, "Node " + nodeId + " is not a sibling of " + parent.prevSibling ) );
                                    }
                                    parent.prevSibling = nodeId;
                                }


                                switch( status ) {


                                    case XMLStreamReader.ATTRIBUTE: {
                                        attributeCount++;
                                        break;
                                    }


                                    case XMLStreamReader.END_ELEMENT: {
                                        if( elementStack.isEmpty() ) {
                                            return( new org.exist.backup.ErrorReport.ResourceError( ErrorReport.NODE_HIERARCHY, "Error in node hierarchy: received END_ELEMENT event " + "but stack was empty!" ) );
                                        }
                                        final ElementNode lastElem = elementStack.pop();
                                        if( lastElem.childCount != lastElem.elem.getChildCount() ) {
                                            return( new ErrorReport.ResourceError( org.exist.backup.ErrorReport.NODE_HIERARCHY, "Element reports incorrect child count: expected " + lastElem.elem.getChildCount() + " but found " + lastElem.childCount ) );
                                        }
                                        break;
                                    }


                                    case XMLStreamReader.START_ELEMENT: {
                                        if( nodeId.getTreeLevel() <= defaultIndexDepth ) {


                                            // check dom.dbx btree, which maps the node
                                            // id to the node's storage address
                                            // look up the node id and check if the
                                            // returned storage address is correct
                                            final NativeBroker.NodeRef nodeRef = new NativeBroker.NodeRef( doc.getDocId(), nodeId );


                                            try {
                                                final long p = domDb.findValue( nodeRef );


                                                if( p != reader.getCurrentPosition() ) {
                                                    final Value v = domDb.get( p );


                                                    if( v == null ) {
                                                        return( new ErrorReport.IndexError( ErrorReport.DOM_INDEX, "Failed to access node " + nodeId + " through dom.dbx index. Wrong storage address. Expected: " + p + "; got: " + reader.getCurrentPosition() + " - ", doc.getDocId() ) );
                                                    }
                                                }

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      assertNotNull(mgr);
      Txn txn = mgr.beginTransaction();
      assertNotNull(txn);
      System.out.println("Transaction started ...");
            
            DOMFile domDb = ((NativeBroker) broker).getDOMFile();
            assertNotNull(domDb);
            domDb.setOwnerObject(this);
            
            // put 1000 values into the btree
            long firstToRemove = -1;
            for (int i = 1; i <= 10000; i++) {
                byte[] data = ("Value" + i).getBytes();
                NodeId id = idFact.createInstance(i);
                long addr = domDb.put(txn, new NativeBroker.NodeRef(500, id), data);
//              TODO : test addr ?
                if (i == 1)
                    firstToRemove = addr;
            }


            domDb.closeDocument();
            
            // remove all
            NativeBroker.NodeRef ref = new NativeBroker.NodeRef(500);
            assertNotNull(ref);
            IndexQuery idx = new IndexQuery(IndexQuery.TRUNC_RIGHT, ref);
            assertNotNull(idx);
            domDb.remove(txn, idx, null);
            domDb.removeAll(txn, firstToRemove);
            
            // put some more
            for (int i = 1; i <= 10000; i++) {
                byte[] data = ("Value" + i).getBytes();
                @SuppressWarnings("unused")
        long addr = domDb.put(txn, new NativeBroker.NodeRef(500, idFact.createInstance(i)), data);
//              TODO : test addr ?
            }
            
            domDb.closeDocument();
            mgr.commit(txn);
            System.out.println("Transaction commited ...");
            
            txn = mgr.beginTransaction();
            System.out.println("Transaction started ...");
            
            // put 1000 new values into the btree
            for (int i = 1; i <= 1000; i++) {
                byte[] data = ("Value" + i).getBytes();
                long addr = domDb.put(txn, new NativeBroker.NodeRef(501, idFact.createInstance(i)), data);
//              TODO : test addr ?                
                if (i == 1)
                    firstToRemove = addr;
            }            
            
            domDb.closeDocument();
            mgr.commit(txn);
            System.out.println("Transaction commited ...");
            
            // the following transaction is not committed and will be rolled back during recovery
            txn = mgr.beginTransaction();
            System.out.println("Transaction started ...");
            
            for (int i = 1; i <= 200; i++) {
                domDb.remove(txn, new NativeBroker.NodeRef(500, idFact.createInstance(i)));
            }


            idx = new IndexQuery(IndexQuery.TRUNC_RIGHT, new NativeBroker.NodeRef(501));
            domDb.remove(txn, idx, null);
            domDb.removeAll(txn, firstToRemove);
            
//          Don't commit...
            mgr.commit(txn);
            mgr.getJournal().flushToLog(true);
            System.out.println("Transaction interrupted ...");
            
            Writer writer = new StringWriter();
            domDb.dump(writer);
            System.out.println(writer.toString());
      } catch (Exception e) {
        e.printStackTrace();
          fail(e.getMessage());               
    } finally {

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            broker = pool.get(pool.getSecurityManager().getSystemSubject());
            assertNotNull(broker);
            TransactionManager mgr = pool.getTransactionManager();
            assertNotNull(mgr);
            
            DOMFile domDb = ((NativeBroker) broker).getDOMFile();
            assertNotNull(domDb);
            domDb.setOwnerObject(this);
            
            IndexQuery query = new IndexQuery(IndexQuery.GT, new NativeBroker.NodeRef(500));
            assertNotNull(query);
            List<?> keys = domDb.findKeys(query);
            assertNotNull(keys);
            int count = 0;
            for (Iterator<?> i = keys.iterator(); i.hasNext(); count++) {
                Value key = (Value) i.next();
                assertNotNull(key);
                Value value = domDb.get(key);
                assertNotNull(value);
                System.out.println(new String(value.data(), value.start(), value.getLength()));
            }
            System.out.println("Values read: " + count);
            
            Writer writer = new StringWriter();
            domDb.dump(writer);
            System.out.println(writer.toString());
      } catch (Exception e) {            
          fail(e.getMessage());             
        } finally {
            pool.release(broker);

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            is.close();
            data = new String(bdata);
            assertNotNull(data);
            System.out.println(data);
            
            DOMFile domDb = ((NativeBroker)broker).getDOMFile();
            assertNotNull(domDb);
            Writer writer = new StringWriter();
            domDb.dump(writer);
            //System.out.println(writer.toString());
            
            transact = pool.getTransactionManager();
            assertNotNull(transact);
            transaction = transact.beginTransaction();

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                assertNotNull(modifications);
                modifications[0].process(transaction);
                proc.reset();
            }
            
            DOMFile domDb = ((NativeBroker) broker).getDOMFile();
            assertNotNull(domDb);
            System.out.println(domDb.debugPages(info.getDocument(), false));
            
            mgr.commit(transaction);
            System.out.println("Transaction commited ...");
            
            // the following transaction will not be committed and thus undone during recovery

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                assertNotNull(modifications);
                modifications[0].process(transaction);
                proc.reset();
            }
            
            DOMFile domDb = ((NativeBroker) broker).getDOMFile();
            assertNotNull(domDb);
            System.out.println(domDb.debugPages(info.getDocument(), false));
            
            mgr.commit(transaction);
            System.out.println("Transaction commited ...");            
            
            // the following transaction will not be committed and thus undone during recovery

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            broker = pool.get(pool.getSecurityManager().getSystemSubject());
            broker.flush();
            Txn txn = mgr.beginTransaction();
            System.out.println("Transaction started ...");
            
            DOMFile domDb = ((NativeBroker) broker).getDOMFile();
            domDb.setOwnerObject(this);
            
            BrokerPool.FORCE_CORRUPTION = true;
            
            // put 1000 values into the btree
            NodeId id;
            for (int i = 1; i < 1001; i++) {
              id = idFact.createInstance(i);
                domDb.addValue(txn, new NativeBroker.NodeRef(500, id), i);
            }
            
            IndexQuery idx = new IndexQuery(IndexQuery.GT, new NativeBroker.NodeRef(500, idFact.createInstance(800)));
            domDb.remove(txn, idx, null);
            
            mgr.commit(txn);
            
            // start a dirty, uncommitted transaction. This will be rolled back by the recovery.
            txn = mgr.beginTransaction();
            
            for (int i = 801; i < 2001; i++) {
                domDb.addValue(txn, new NativeBroker.NodeRef(500, idFact.createInstance(i)), i);
            }
            
            for (int i = 101; i < 301; i++) {
                domDb.addValue(txn, new NativeBroker.NodeRef(500, idFact.createInstance(i)), i * 3);
            }
            
            idx = new IndexQuery(IndexQuery.GT, new NativeBroker.NodeRef(500, idFact.createInstance(600)));
            domDb.remove(txn, idx, null);
            
            mgr.getJournal().flushToLog(true);
            
            Writer writer = new StringWriter();
            domDb.dump(writer);
            System.out.println(writer.toString());
        } catch (Exception e) {
          e.printStackTrace();
            fail(e.getMessage());
        } finally {

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        NodeIdFactory idFact = pool.getNodeFactory();
        DBBroker broker = null;
        try {
            broker = pool.get(pool.getSecurityManager().getSystemSubject());
            
            DOMFile domDb = ((NativeBroker) broker).getDOMFile();
            domDb.setOwnerObject(this);
            
            IndexQuery query = new IndexQuery(IndexQuery.GEQ, new NativeBroker.NodeRef(500, idFact.createInstance(1)));
            domDb.query(query, new IndexCallback());
            System.out.println("Found: " + count);
            assertEquals(count, 800);
            
            Writer writer = new StringWriter();
            domDb.dump(writer);
            System.out.println(writer.toString());
        } catch (Exception e) {
          e.printStackTrace();
            fail(e.getMessage());
        } finally {

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            Collection test2 = broker.getOrCreateCollection(transaction, TestConstants.TEST_COLLECTION_URI2);
            assertNotNull(test2); 
            broker.saveCollection(transaction, test2);
            
            System.out.println("Contents of dom.dbx:\n\n");
            DOMFile domDb = ((NativeBroker)broker).getDOMFile();
            assertNotNull(domDb); 
            Writer writer = new StringWriter();
            domDb.dump(writer);
            System.out.println(writer.toString());
            
            File f;
            IndexInfo info;

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