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

        //if invalid arguments then abort
        if((pool == null) || (xqueryresource == null) || (user == null)) {
            abort("BrokerPool or XQueryResource or User was null!");
        }


        DBBroker broker = null;
        DocumentImpl resource = null;
        Source source = null;
        XQueryPool xqPool  = null;
        CompiledXQuery compiled = null;
        XQueryContext context = null;


        try {


            //get the xquery
            broker = pool.get(user);


            if(xqueryresource.indexOf(':') > 0) {
                source = SourceFactory.getSource(broker, "", xqueryresource, true);
            } else {
                final XmldbURI pathUri = XmldbURI.create(xqueryresource);
                resource = broker.getXMLResource(pathUri, Lock.READ_LOCK);


                if(resource != null) {
                    source = new DBSource(broker, (BinaryDocument)resource, true);
                }
            }


            if(source != null) {


                //execute the xquery
                final XQuery xquery = broker.getXQueryService();
                xqPool = xquery.getXQueryPool();


                //try and get a pre-compiled query from the pool
                compiled = xqPool.borrowCompiledXQuery(broker, source);

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            //
        }
    }
    
    public boolean mkdir() {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
          final Collection collection = broker.getCollection(uri.toCollectionPathURI());
          if (collection != null) {return true;}
  
          final Collection parent_collection = broker.getCollection(uri.toCollectionPathURI().removeLastSegment());
          if (parent_collection == null) {return false;}
  
          tm = db.getTransactionManager();
      final Txn transaction = tm.beginTransaction();
      
      try {
        final Collection child = broker.getOrCreateCollection(transaction, uri.toCollectionPathURI());
        broker.saveCollection(transaction, child);
        tm.commit(transaction);
      } catch (final Exception e) {
          tm.abort(transaction);
        return false;
      } finally {

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      return true;
    }


    public boolean mkdirs() {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
          final Collection collection = broker.getCollection(uri.toCollectionPathURI());
          if (collection != null) {return true;}
  
      tm = db.getTransactionManager();
      final Txn transaction = tm.beginTransaction();
      
      try {
        final Collection child = broker.getOrCreateCollection(transaction, uri.toCollectionPathURI());
        broker.saveCollection(transaction, child);
        tm.commit(transaction);
      } catch (final Exception e) {
          tm.abort(transaction);
        return false;
      } finally {

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    }
    
    public boolean _renameTo(File dest) {
      final XmldbURI destinationPath = ((Resource)dest).uri;


      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
      tm = db.getTransactionManager();
      Txn transaction = null;
  
          org.exist.collections.Collection destination = null;
          org.exist.collections.Collection source = null;
          XmldbURI newName;
      try {
           source = broker.openCollection(uri.removeLastSegment(), Lock.WRITE_LOCK);
          if(source == null) {
            return false;
              }
          final DocumentImpl doc = source.getDocument(broker, uri.lastSegment());
              if(doc == null) {
                  return false;
              }
              destination = broker.openCollection(destinationPath.removeLastSegment(), Lock.WRITE_LOCK);
              if(destination == null) {
                  return false;
              }
              
              newName = destinationPath.lastSegment();
  
              transaction = tm.beginTransaction();
              broker.moveResource(transaction, doc, destination, newName);
              tm.commit(transaction);
              return true;
              
          } catch ( final Exception e ) {
            e.printStackTrace();

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//      System.out.println("rename from "+uri+" to "+dest.getPath());
      
        final XmldbURI destinationPath = ((Resource)dest).uri;


        DBBroker broker = null; 
        BrokerPool db = null;
        TransactionManager tm;


        try {
            try {
                db = BrokerPool.getInstance();
                broker = db.get(null);
            } catch (final EXistException e) {
                return false;
            }
    
            tm = db.getTransactionManager();
            Txn transaction = null;
    
            org.exist.collections.Collection destination = null;
            org.exist.collections.Collection source = null;
            XmldbURI newName;
            try {
                source = broker.openCollection(uri.removeLastSegment(), Lock.WRITE_LOCK);
                if(source == null) {
                    return false;
                }
                final DocumentImpl doc = source.getDocument(broker, uri.lastSegment());
                if(doc == null) {
                    return false;
                }
                destination = broker.openCollection(destinationPath.removeLastSegment(), Lock.WRITE_LOCK);
                if(destination == null) {
                    return false;
                }
                
                newName = destinationPath.lastSegment();

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    protected synchronized void uploadTmpFile() throws IOException {
      if (file == null)
        {throw new IOException();}
      
        DBBroker broker = null; 
        BrokerPool db = null;
        TransactionManager tm = null;
        Txn txn = null;


        try {

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            }
        }
    }
    
    public boolean delete() {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        return false;
      }
  
      tm = db.getTransactionManager();
          Txn txn = null;
          try {
              collection = broker.openCollection(uri.removeLastSegment(), Lock.NO_LOCK);
              if (collection == null) {
                  return false;
              }
              // keep the write lock in the transaction
              //transaction.registerLock(collection.getLock(), Lock.WRITE_LOCK);

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  }
  
    private void store(String name,  String data) throws EXistException {
      Database pool = BrokerPool.getInstance();;
      
        DBBroker broker = null;
        TransactionManager transact = null;
        Txn transaction = null;
        try {
            broker = pool.get(pool.getSecurityManager().getSystemSubject());
            assertNotNull(broker);
            transact = pool.getTransactionManager();
            assertNotNull(transact);
            transaction = transact.beginTransaction();
            assertNotNull(transaction);


            Collection root = broker.getOrCreateCollection(transaction, TestConstants.TEST_COLLECTION_URI);
        broker.saveCollection(transaction, root);
            assertNotNull(root);


            root.addBinaryResource(transaction, broker, XmldbURI.create(name), data.getBytes(), "application/xquery");


            transact.commit(transaction);

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            initialized = false;
        }
    }


    public boolean createNewFile() throws IOException {
      DBBroker broker = null; 
    BrokerPool db = null;
    TransactionManager tm;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new IOException(e);
      }
      
//      if (!uri.startsWith("/db"))
//        uri = XmldbURI.DB.append(uri);
//  
      try {
        if (uri.endsWith("/"))
          {throw new IOException("It collection, but should be resource: "+uri);}
      } catch (final Exception e) {
        throw new IOException(e);
      }
      
      final XmldbURI collectionURI = uri.removeLastSegment();
      collection = broker.getCollection(collectionURI);
      if (collection == null)
        {throw new IOException("Collection not found: "+collectionURI);}
      
      final XmldbURI fileName = uri.lastSegment();
  
//      try {
//        resource = broker.getXMLResource(uri, Lock.READ_LOCK);
//      } catch (final PermissionDeniedException e1) {
//      } finally {
//        if (resource != null) {
//          resource.getUpdateLock().release(Lock.READ_LOCK);
//          collection = resource.getCollection();
//          initialized = true;
//          
//          return false;
//        }
//      }
//      
      try {
        resource = broker.getResource(uri, Lock.READ_LOCK);
      } catch (final PermissionDeniedException e1) {
      } finally {
        if (resource != null) {
          resource.getUpdateLock().release(Lock.READ_LOCK);
          collection = resource.getCollection();

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        collection = null;
        resource = null;
        initialized = false;
    }
      
      DBBroker broker = null; 
    BrokerPool db = null;


    try {
      try {
        db = BrokerPool.getInstance();
        broker = db.get(null);
      } catch (final EXistException e) {
        throw new IOException(e);
      }
  
      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);
            }
          } else {
            collection = resource.getCollection();

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