Examples with NodeReadTrx org.sirix.api.NodeReadTrx used on opensource projects

Example 16 with NodeReadTrx

use of org.sirix.api.NodeReadTrx in project sirix by sirixdb.

the class NodeWrapper method getStringValueCS.

@Override
public final CharSequence getStringValueCS() {
    String value = "";
    try {
        final NodeReadTrx rtx = createRtxAndMove();
        switch(mNodeKind) {
            case DOCUMENT:
            case ELEMENT:
                value = expandString();
                break;
            case ATTRIBUTE:
                value = emptyIfNull(rtx.getValue());
                break;
            case TEXT:
                value = rtx.getValue();
                break;
            case COMMENT:
            case PROCESSING_INSTRUCTION:
                value = emptyIfNull(rtx.getValue());
                break;
            default:
                value = "";
        }
        rtx.close();
    } catch (final SirixException exc) {
        LOGGER.error(exc.toString());
    }
    return value;
}

Example 17 with NodeReadTrx

use of org.sirix.api.NodeReadTrx in project sirix by sirixdb.

the class NodeWrapper method getSiblingPosition.

@Override
public int getSiblingPosition() {
    int index = 0;
    try {
        final NodeReadTrx rtx = createRtxAndMove();
        while (rtx.hasLeftSibling()) {
            rtx.moveToLeftSibling();
            index++;
        }
        rtx.close();
    } catch (final SirixException e) {
        LOGGER.error(e.getMessage(), e);
    }
    return index;
}

Example 18 with NodeReadTrx

use of org.sirix.api.NodeReadTrx in project sirix by sirixdb.

the class RestXPathProcessor method doXPathRes.

/**
 * This method performs an XPath evaluation and writes it to a given output
 * stream.
 *
 * @param resource
 *          The existing resource.
 * @param revision
 *          The revision of the requested document.
 * @param output
 *          The output stream where the results are written.
 * @param nodeid
 *          <code>true</code> if node id's have to be delivered.
 *          <code>false</code> otherwise.
 * @param xpath
 *          The XPath expression.
 * @throws SirixException
 */
private void doXPathRes(final String resource, final Integer revision, final OutputStream output, final boolean nodeid, final String xpath) throws SirixException {
    // Database connection to sirix
    Database database = null;
    Session session = null;
    NodeReadTrx rtx = null;
    try {
        database = Databases.openDatabase(mStoragePath);
        session = database.getSession(new SessionConfiguration.Builder(resource).build());
        // Creating a transaction
        if (revision == null) {
            rtx = session.beginNodeReadTrx();
        } else {
            rtx = session.beginNodeReadTrx(revision);
        }
        final Axis axis = new XPathAxis(rtx, xpath);
        for (final long key : axis) {
            WorkerHelper.serializeXML(session, output, false, nodeid, key, revision).call();
        }
    } catch (final Exception globExcep) {
        throw new WebApplicationException(globExcep, Response.Status.INTERNAL_SERVER_ERROR);
    } finally {
        if (rtx != null) {
            rtx.moveTo(Fixed.DOCUMENT_NODE_KEY.getStandardProperty());
            WorkerHelper.closeRTX(rtx, session, database);
        }
    }
}

Example 19 with NodeReadTrx

use of org.sirix.api.NodeReadTrx in project sirix by sirixdb.

the class RestXPathProcessor method getXpathResource.

/**
 * Getting part of the XML based on a XPath query
 *
 * @param dbFile
 *          where the content should be extracted
 *
 * @param query
 *          contains XPath query
 * @param rId
 *          To response the resource with a restid for each node (
 *          <code>true</code>) or without ( <code>false</code>).
 * @param doRevision
 *          The revision of the requested resource. If <code>null</code>, than
 *          response the latest revision.
 * @param output
 *          The OutputStream reference which have to be modified and returned
 * @param doNodeId
 *          specifies whether node id should be shown
 * @param doWrap
 *          output of result elements
 * @throws SirixException
 */
public void getXpathResource(final File dbFile, final long rId, final String query, final boolean doNodeId, final Integer doRevision, final OutputStream output, final boolean doWrap) throws SirixException {
    // work around because of query root char '/'
    String qQuery = query;
    if (query.charAt(0) == '/')
        qQuery = ".".concat(query);
    Database database = null;
    Session session = null;
    NodeReadTrx rtx = null;
    try {
        database = Databases.openDatabase(dbFile.getParentFile());
        session = database.getSession(new SessionConfiguration.Builder(dbFile.getName()).build());
        if (doRevision == null) {
            rtx = session.beginNodeReadTrx();
        } else {
            rtx = session.beginNodeReadTrx(doRevision);
        }
        final boolean exist = rtx.moveTo(rId).hasMoved();
        if (exist) {
            final Axis axis = new XPathAxis(rtx, qQuery);
            if (doWrap) {
                output.write(beginResult.getBytes());
                for (final long key : axis) {
                    WorkerHelper.serializeXML(session, output, false, doNodeId, key, doRevision).call();
                }
                output.write(endResult.getBytes());
            } else {
                for (final long key : axis) {
                    WorkerHelper.serializeXML(session, output, false, doNodeId, key, doRevision).call();
                }
            }
        } else {
            throw new WebApplicationException(404);
        }
    } catch (final Exception globExcep) {
        throw new WebApplicationException(globExcep, Response.Status.INTERNAL_SERVER_ERROR);
    } finally {
        WorkerHelper.closeRTX(rtx, session, database);
    }
}

Example 20 with NodeReadTrx

use of org.sirix.api.NodeReadTrx in project sirix by sirixdb.

the class DatabaseRepresentation method getModificHistory.

/**
 * This method reads the existing database, and offers all modifications of
 * the two given revisions
 *
 * @param resourceName
 *          The name of the existing database.
 * @param revisionRange
 *          Contains the range of revisions
 * @param nodeid
 *          To response the resource with a restid for each node (
 *          <code>true</code>) or without ( <code>false</code>).
 * @param output
 *          The OutputStream reference which have to be modified and returned
 * @param wrap
 *          <code>true</code> if the results have to be wrapped.
 *          <code>false</code> otherwise.
 * @return The {@link OutputStream} containing the result
 * @throws SirixException
 * @throws WebApplicationException
 *           The Exception occurred.
 */
public OutputStream getModificHistory(// NOPMD this method needs alls these
final String resourceName, // functions
final String revisionRange, final boolean nodeid, final OutputStream output, final boolean wrap) throws JaxRxException, SirixException {
    // extract both revision from given String value
    final StringTokenizer tokenizer = new StringTokenizer(revisionRange, "-");
    final int revision1 = Integer.valueOf(tokenizer.nextToken());
    final int revision2 = Integer.valueOf(tokenizer.nextToken());
    if (revision1 < revision2 && revision2 <= getLastRevision(resourceName)) {
        // variables for highest rest-id in respectively revision
        long maxRestidRev1 = 1;
        long maxRestidRev2 = 1;
        // Connection to sirix, creating a session
        Database database = null;
        Axis axis = null;
        NodeReadTrx rtx = null;
        Session session = null;
        // List for all restIds of modifications
        final List<Long> modificRestids = new LinkedList<Long>();
        // List of all restIds of revision 1
        final List<Long> restIdsRev1 = new LinkedList<Long>();
        try {
            database = Databases.openDatabase(mStoragePath);
            session = database.getSession(new SessionConfiguration.Builder(resourceName).build());
            // get highest rest-id from given revision 1
            rtx = session.beginNodeReadTrx(revision1);
            axis = new XPathAxis(rtx, ".//*");
            while (axis.hasNext()) {
                axis.next();
                if (rtx.getNodeKey() > maxRestidRev1) {
                    maxRestidRev1 = rtx.getNodeKey();
                }
                // stores all restids from revision 1 into a list
                restIdsRev1.add(rtx.getNodeKey());
            }
            rtx.moveTo(Fixed.DOCUMENT_NODE_KEY.getStandardProperty());
            rtx.close();
            // get highest rest-id from given revision 2
            rtx = session.beginNodeReadTrx(revision2);
            axis = new XPathAxis(rtx, ".//*");
            while (axis.hasNext()) {
                axis.next();
                final Long nodeKey = rtx.getNodeKey();
                if (nodeKey > maxRestidRev2) {
                    maxRestidRev2 = rtx.getNodeKey();
                }
                if (nodeKey > maxRestidRev1) {
                    /*
						 * writes all restids of revision 2 higher than the highest restid
						 * of revision 1 into the list
						 */
                    modificRestids.add(nodeKey);
                }
                /*
					 * removes all restids from restIdsRev1 that appears in revision 2 all
					 * remaining restids in the list can be seen as deleted nodes
					 */
                restIdsRev1.remove(nodeKey);
            }
            rtx.moveTo(Fixed.DOCUMENT_NODE_KEY.getStandardProperty());
            rtx.close();
            rtx = session.beginNodeReadTrx(revision1);
            // linked list for holding unique restids from revision 1
            final List<Long> restIdsRev1New = new LinkedList<Long>();
            /*
				 * Checks if a deleted node has a parent node that was deleted too. If
				 * so, only the parent node is stored in new list to avoid double print
				 * of node modification
				 */
            for (Long nodeKey : restIdsRev1) {
                rtx.moveTo(nodeKey);
                final long parentKey = rtx.getParentKey();
                if (!restIdsRev1.contains(parentKey)) {
                    restIdsRev1New.add(nodeKey);
                }
            }
            rtx.moveTo(Fixed.DOCUMENT_NODE_KEY.getStandardProperty());
            rtx.close();
            if (wrap) {
                output.write(beginResult.getBytes());
            }
            /*
				 * Shred modified restids from revision 2 to xml fragment Just
				 * modifications done by post commands
				 */
            rtx = session.beginNodeReadTrx(revision2);
            for (Long nodeKey : modificRestids) {
                rtx.moveTo(nodeKey);
                WorkerHelper.serializeXML(session, output, false, nodeid, nodeKey, revision2).call();
            }
            rtx.moveTo(Fixed.DOCUMENT_NODE_KEY.getStandardProperty());
            rtx.close();
            /*
				 * Shred modified restids from revision 1 to xml fragment Just
				 * modifications done by put and deletes
				 */
            rtx = session.beginNodeReadTrx(revision1);
            for (Long nodeKey : restIdsRev1New) {
                rtx.moveTo(nodeKey);
                WorkerHelper.serializeXML(session, output, false, nodeid, nodeKey, revision1).call();
            }
            if (wrap) {
                output.write(endResult.getBytes());
            }
            rtx.moveTo(Fixed.DOCUMENT_NODE_KEY.getStandardProperty());
        } catch (final Exception globExcep) {
            throw new JaxRxException(globExcep);
        } finally {
            WorkerHelper.closeRTX(rtx, session, database);
        }
    } else {
        throw new JaxRxException(400, "Bad user request");
    }
    return output;
}