Examples of org.exist.storage.DBBroker

org.exist.storage.DBBroker
This is the base class for all database backends. All the basic database operations like storing, removing or index access are provided by subclasses of this class. @author Wolfgang Meier

            {previous = getLastNode(previous);}
        final NodePath oldPath = oldNode.getPath();
        StreamListener listener = null;
        //May help getReindexRoot() to make some useful things
        Node newNode = null;
        DBBroker broker = null;
        try {
            broker = ownerDocument.getBrokerPool().get(null);
            broker.getIndexController().setDocument(ownerDocument);
            final StoredNode reindexRoot = broker.getIndexController().getReindexRoot(oldNode, oldPath, false);
            broker.getIndexController().setMode(StreamListener.REMOVE_SOME_NODES);
            if (reindexRoot == null) {
                listener = broker.getIndexController().getStreamListener();
            } else {
                broker.getIndexController().reindex(transaction, reindexRoot,
                    StreamListener.REMOVE_SOME_NODES);
            }
            broker.removeAllNodes(transaction, oldNode, oldPath, listener);
            broker.endRemove(transaction);
            broker.flush();
            broker.getIndexController().setMode(StreamListener.STORE);
            listener = broker.getIndexController().getStreamListener();
            newNode = appendChild(transaction, oldNode.nodeId, new NodeImplRef(previous),
                getPath(), newChild, listener);
            //Reindex if required
            final DocumentImpl owner = (DocumentImpl)getOwnerDocument();
            broker.storeXMLResource(transaction, owner);
            broker.updateNode(transaction, this, false);
            broker.getIndexController().reindex(transaction, reindexRoot, StreamListener.STORE);
            broker.flush();
        } catch (final EXistException e) {
            LOG.warn("Exception while inserting node: " + e.getMessage(), e);
        } finally {
          if (broker != null)
            broker.release();
        }
        //return oldChild;  // method is spec'd to return the old child, even though that's probably useless in this case
        return newNode; //returning the newNode is more sensible than returning the oldNode
    }

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        return enabled;
    }


    public final boolean isLogEnabled() {
        try {
            final DBBroker broker = db.getActiveBroker();
            final Boolean globalProp = (Boolean) broker.getConfiguration().getProperty(CONFIG_PROPERTY_TRACELOG);
            return logEnabled || (globalProp != null && globalProp.booleanValue());
        } catch (Throwable t) {
            log.debug("Ignored exception: " + t.getMessage());
            return logEnabled;
        }

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  }


    public void restore(RestoreListener listener, String username, Object credentials, String newCredentials, File f, String uri) throws XMLDBException, FileNotFoundException, IOException, SAXException, ParserConfigurationException, URISyntaxException, AuthenticationException, ConfigurationException, PermissionDeniedException {
        
        //login
        final DBBroker broker = db.authenticate(username, credentials);
        try {
          //set the new password
          setAdminCredentials(broker, newCredentials);
  
          //get the backup descriptors, can be more than one if it was an incremental backup

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    public String[] list() {
      
      if (isDirectory()) {
        
          DBBroker broker = null; 
        BrokerPool db = null;


        try {
          try {
            db = BrokerPool.getInstance();

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        {return null;}
      
      if (collection == null)
        {return null;}
      
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();

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      doc = getDocument();
    } catch (final IOException e) {
      throw new FileNotFoundException(e.getMessage());
    }
    
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new FileNotFoundException(e.getMessage());
      }
  
      if (doc instanceof BinaryDocument) {
        return broker.getBinaryFile(((BinaryDocument)doc));
        
      } else {
        return serialize(broker, doc);
      }

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    }
    
    private void modifyMetadata(ModifyMetadata method) throws IOException {
//      if (initialized) {return;}
      
    DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new IOException(e);
      }
  
      final TransactionManager tm = db.getTransactionManager();
      Txn txn = null;
      
      try {
        //collection
        if (uri.endsWith("/")) {
          collection = broker.getCollection(uri);
          if (collection == null)
            {throw new IOException("Resource not found: "+uri);}
          
        //resource
        } else {
          resource = broker.getXMLResource(uri, Lock.READ_LOCK);
          if (resource == null) {
            //may be, it's collection ... checking ...
            collection = broker.getCollection(uri);
            if (collection == null) {
              throw new IOException("Resource not found: "+uri);
            }
            
            txn = tm.beginTransaction();


            method.modify(collection);
            broker.saveCollection(txn, collection);
            
            tm.commit(txn);


          } else {
            collection = resource.getCollection();


            txn = tm.beginTransaction();
            
            method.modify(resource);
                  broker.storeMetadata(txn, resource);
            
            tm.commit(txn);
          }
        }
      } catch (final IOException e) {

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  public DocumentImpl getDocument(String uuid) throws EXistException, PermissionDeniedException {
    MetasImpl ms = docByUUID.get(uuid);
    if (ms == null) return null;
    
    BrokerPool db = null;
    DBBroker broker = null;
    try {
      db = BrokerPool.getInstance();
      broker = db.get(null);
      
      XmldbURI uri = XmldbURI.create(ms.uri);
      Collection col = broker.getCollection(uri.removeLastSegment());
      if (col != null) {
        return col.getDocument(broker, uri.lastSegment());
      }
      
      return null;

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  public Collection getCollection(String uuid) throws EXistException, PermissionDeniedException {
    MetasImpl ms = docByUUID.get(uuid);
    if (ms == null) return null;
    
    BrokerPool db = null;
    DBBroker broker = null;
    try {
      db = BrokerPool.getInstance();
      broker = db.get(null);
      
      XmldbURI uri = XmldbURI.create(ms.uri);
      return broker.getCollection(uri);
    } finally {
      if (db != null)
        db.release(broker);
    }
  }

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     * The method <code>getNodeValue</code>
     *
     * @return a <code>String</code> value
     */
    public String getNodeValue() {
        DBBroker broker = null;
        try {
            broker = doc.getBrokerPool().get(null);
            if (isDocument()) {
                final Element e = doc.getDocumentElement();
                if (e instanceof NodeProxy) {
                    return broker.getNodeValue(new StoredNode((NodeProxy)e), false);
                } else if (e != null) {
                    return broker.getNodeValue((ElementImpl)e, false);
                } else
                    // probably a binary resource
                    {return "";}
            } else {
                return broker.getNodeValue(new StoredNode(this), false);
            }
        } catch (final EXistException e) {
            //TODO : raise an exception here ! -pb
        } finally {
            doc.getBrokerPool().release(broker);

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