Examples of org.exist.storage.DBBroker.openCollection()

org.exist.storage.DBBroker.openCollection()
Open a collection for reading or writing. The collection is identified by its absolute path, e.g. /db/shakespeare. It will be loaded and locked according to the lockMode argument. The caller should take care to release the collection lock properly. @param uri The collection path @param lockMode one of the modes specified in class {@link org.exist.storage.lock.Lock} @return collection or null if no collection matches the path

        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());

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        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;
            }

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        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);

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        try {
            broker = brokerPool.get(subject);


            // Check if collection exists. not likely to happen since availability is checked
            // by ResourceFactory
            collection = broker.openCollection(xmldbUri, Lock.WRITE_LOCK);
            if (collection == null) {
                LOG.debug(String.format("Collection %s does not exist", xmldbUri));
                txnManager.abort(txn);
                throw new CollectionDoesNotExistException(xmldbUri + "");
            }

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            // This class contains already the URI of the resource that shall be moved/copied
            XmldbURI srcCollectionUri = xmldbUri;


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

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                return; // TODO throw
            }




            // Open collection if possible, else abort
            destCollection = broker.openCollection(destCollectionUri, Lock.WRITE_LOCK);
            if (destCollection == null) {
                LOG.debug(String.format("Destination collection %s does not exist.", xmldbUri));
                txnManager.abort(txn);
                return; // TODO throw?
            }

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            // Need to split path into collection and document name
            XmldbURI collName = xmldbUri.removeLastSegment();
            XmldbURI docName = xmldbUri.lastSegment();


            // Open collection if possible, else abort
            collection = broker.openCollection(collName, Lock.WRITE_LOCK);
            if (collection == null) {
                LOG.debug("Collection does not exist");
                txnManager.abort(txn);
                return;
            }

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            // Need to split path into collection and document name
            XmldbURI srcCollectionUri = xmldbUri.removeLastSegment();
            XmldbURI srdDocumentUri = xmldbUri.lastSegment();


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

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                txnManager.abort(txn);
                return;
            }


            // Open collection if possible, else abort
            destCollection = broker.openCollection(destCollectionUri, Lock.WRITE_LOCK);
            if (destCollection == null) {
                LOG.debug(String.format("Destination collection %s does not exist.", xmldbUri));
                txnManager.abort(txn);
                return;
            }

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        final TransactionManager transact = factory.getBrokerPool().getTransactionManager();
        final Txn transaction = transact.beginTransaction();
        try {
            broker = factory.getBrokerPool().get(user);
            try {
              collection = broker.openCollection(collUri, Lock.READ_LOCK);
              if (collection == null) {
                  transact.abort(transaction);
                  throw new EXistException("collection " + collUri + " not found!");
              }
            } finally {

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