Examples of org.exist.collections.Collection

org.exist.collections.Collection
This class represents a collection in the database. A collection maintains a list of sub-collections and documents, and provides the methods to store/remove resources. Collections are shared between {@link org.exist.storage.DBBroker} instances. The calleris responsible to lock/unlock the collection. Call {@link DBBroker#openCollection(XmldbURI,int)}to get a collection with a read or write lock and {@link #release(int)} to release the lock. @author wolf

    }


    private List<RangeIndexConfig> getConfigurations(Sequence contextSequence) {
        List<RangeIndexConfig> configs = new ArrayList<RangeIndexConfig>();
        for (final Iterator<Collection> i = contextSequence.getCollectionIterator(); i.hasNext(); ) {
            final Collection collection = i.next();
            if (collection.getURI().startsWith(XmldbURI.SYSTEM_COLLECTION_URI)) {
                continue;
            }
            IndexSpec idxConf = collection.getIndexConfiguration(context.getBroker());
            if (idxConf != null) {
                final RangeIndexConfig config = (RangeIndexConfig) idxConf.getCustomIndexSpec(RangeIndex.ID);
                if (config != null) {
                    configs.add(config);
                }

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            assertEquals(1, seq.getItemCount());


            checkIndex(broker, docs, "cha", 1);
            checkIndex(broker, docs, "le8", 1);


            Collection root = broker.openCollection(TestConstants.TEST_COLLECTION_URI, Lock.WRITE_LOCK);
            assertNotNull(root);


            root.removeXMLResource(transaction, broker, XmldbURI.create("test_string.xml"));


            checkIndex(broker, docs, "cha", 0);


            seq = xquery.execute("//item[ngram:contains(., 'cha')]", null, AccessContext.TEST);
            assertNotNull(seq);

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            assertNotNull(transact);
            transaction = transact.beginTransaction();
            assertNotNull(transaction);
            System.out.println("Transaction started ...");


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


            CollectionConfigurationManager mgr = pool.getConfigurationManager();
            mgr.addConfiguration(transaction, broker, root, COLLECTION_CONFIG);


            docs = new DefaultDocumentSet();


            IndexInfo info = root.validateXMLResource(transaction, broker, XmldbURI.create("test_string.xml"), XML);
            assertNotNull(info);
            root.store(transaction, broker, info, XML, false);


            docs.add(info.getDocument());


            info = root.validateXMLResource(transaction, broker, XmldbURI.create("test_string2.xml"), XML2);
            assertNotNull(info);
            root.store(transaction, broker, info, XML2, false);


            docs.add(info.getDocument());


            transact.commit(transaction);
        } catch (Exception e) {

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            assertNotNull(transact);
            transaction = transact.beginTransaction();
            assertNotNull(transaction);
            System.out.println("Transaction started ...");


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


            Collection config = broker.getOrCreateCollection(transaction,
                XmldbURI.create(CollectionConfigurationManager.CONFIG_COLLECTION + "/db"));
            assertNotNull(config);
            broker.removeCollection(transaction, config);
            
            transact.commit(transaction);

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                return null;
            }
            path = new NodePath(contextQName);
        }
        for (final Iterator<Collection> i = contextSequence.getCollectionIterator(); i.hasNext(); ) {
            final Collection collection = i.next();
            if (collection.getURI().startsWith(XmldbURI.SYSTEM_COLLECTION_URI)) {
                continue;
            }
            IndexSpec idxConf = collection.getIndexConfiguration(context.getBroker());
            if (idxConf != null) {
                RangeIndexConfig config = (RangeIndexConfig) idxConf.getCustomIndexSpec(RangeIndex.ID);
                if (config != null) {
                    RangeIndexConfigElement rice = config.find(path);
                    if (rice != null && !rice.isComplex()) {

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            LOG.debug("Already initialized");
            return;
        }


        DBBroker broker = null;
        Collection collection = null;
        try {
            // Get access to collection
            broker = brokerPool.get(subject);
            collection = broker.openCollection(xmldbUri, Lock.READ_LOCK);


            if (collection == null) {
                LOG.error(String.format("Collection for %s cannot be opened for metadata", xmldbUri));
                return;
            }


            // Retrieve some meta data
            permissions = collection.getPermissionsNoLock();
            readAllowed = permissions.validate(subject, Permission.READ);
            writeAllowed = permissions.validate(subject, Permission.WRITE);
            executeAllowed = permissions.validate(subject, Permission.EXECUTE);


            creationTime = collection.getCreationTime();
            lastModified = creationTime; // Collection does not have more information.


            ownerUser = permissions.getOwner().getUsername();
            ownerGroup = permissions.getGroup().getName();


        } catch (PermissionDeniedException | EXistException pde) {
            LOG.error(pde);


        } finally {


            // Clean up collection
            if (collection != null) {
                collection.release(Lock.READ_LOCK);
            }


            // Return broker
            brokerPool.release(broker);

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        List<XmldbURI> collectionURIs = new ArrayList<>();


        DBBroker broker = null;
        Collection collection = null;
        try {
            // Try to read as specified subject
            broker = brokerPool.get(subject);
            collection = broker.openCollection(xmldbUri, Lock.READ_LOCK);


            // Get all collections
            Iterator<XmldbURI> collections = collection.collectionIteratorNoLock(broker); // QQ: use collectionIterator ?
            while (collections.hasNext()) {
                collectionURIs.add(xmldbUri.append(collections.next()));


            }


        } catch (EXistException | PermissionDeniedException e) {
            LOG.error(e);
            //return empty list
            return new ArrayList<>();


        } finally {


            if (collection != null) {
                collection.release(Lock.READ_LOCK);
            }


            brokerPool.release(broker);
        }

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    public List<XmldbURI> getDocumentURIs() {


        List<XmldbURI> documentURIs = new ArrayList<>();


        DBBroker broker = null;
        Collection collection = null;
        try {
            // Try to read as specified subject
            broker = brokerPool.get(subject);
            collection = broker.openCollection(xmldbUri, Lock.READ_LOCK);


            // Get all documents
            Iterator<DocumentImpl> documents = collection.iteratorNoLock(broker); // QQ: use 'iterator'
            while (documents.hasNext()) {
                documentURIs.add(documents.next().getURI());
            }


        } catch (PermissionDeniedException | EXistException e) {
            LOG.error(e);
            //return empty list
            return new ArrayList<>();
            
        } finally {
            // Clean up resources
            if (collection != null) {
                collection.release(Lock.READ_LOCK);
            }


            brokerPool.release(broker);
        }

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        if(LOG.isDebugEnabled())
            LOG.debug(String.format("Deleting '%s'", xmldbUri));


        DBBroker broker = null;
        Collection collection = null;


        TransactionManager txnManager = brokerPool.getTransactionManager();
        Txn txn = txnManager.beginTransaction();


        try {
            broker = brokerPool.get(subject);




            // Open collection if possible, else abort
            collection = broker.openCollection(xmldbUri, Lock.WRITE_LOCK);
            if (collection == null) {
                txnManager.abort(txn);
                return;
            }


            // Remove collection
            broker.removeCollection(txn, collection);


            // Commit change
            txnManager.commit(txn);


            if(LOG.isDebugEnabled())
                LOG.debug("Document deleted sucessfully");




        } catch (EXistException | IOException | PermissionDeniedException | TriggerException e) {
            LOG.error(e);
            txnManager.abort(txn);


        } finally {


            // TODO: check if can be done earlier
            if (collection != null) {
                collection.release(Lock.WRITE_LOCK);
            }


            txnManager.close(txn);
            brokerPool.release(broker);

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        XmldbURI newCollection = xmldbUri.append(name);




        DBBroker broker = null;
        Collection collection = null;


        TransactionManager txnManager = brokerPool.getTransactionManager();
        Txn txn = txnManager.beginTransaction();


        try {
            broker = brokerPool.get(subject);


            // Check if collection exists. not likely to happen since availability is
            // checked by ResourceFactory
            collection = broker.openCollection(newCollection, Lock.WRITE_LOCK);
            if (collection != null) {
                final String msg = "Collection already exists";


                LOG.debug(msg);
                
                //XXX: double "abort" is bad thing!!!
                txnManager.abort(txn);
                throw new CollectionExistsException(msg);
            }


            // Create collection
            Collection created = broker.getOrCreateCollection(txn, newCollection);
            broker.saveCollection(txn, created);
            broker.flush();


            // Commit change
            txnManager.commit(txn);

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