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

Example 1 with Axis

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

the class PathSummaryReader method getPCRsForPath.

/**
 * Get path class records (PCRs) for the specified path.
 *
 * @param path the path for which to get a set of PCRs
 * @return set of PCRs belonging to the specified path
 * @throws SirixException if anything went wrong
 */
public Set<Long> getPCRsForPath(final Path<QNm> path) throws PathException {
    Set<Long> pcrSet = mPathCache.get(path);
    if (pcrSet != null) {
        return pcrSet;
    }
    pcrSet = new HashSet<Long>();
    final boolean isAttributePattern = path.isAttribute();
    final int pathLength = path.getLength();
    final long nodeKey = mCurrentNode.getNodeKey();
    moveToDocumentRoot();
    for (final Axis axis = new DescendantAxis(this); axis.hasNext(); ) {
        axis.next();
        final PathNode node = this.getPathNode();
        if (node == null) {
            continue;
        }
        if (node.getLevel() < pathLength) {
            continue;
        }
        if (isAttributePattern ^ (node.getPathKind() == Kind.ATTRIBUTE)) {
            continue;
        }
        if (path.matches(node.getPath(this))) {
            pcrSet.add(node.getNodeKey());
        }
    }
    moveTo(nodeKey);
    mPathCache.put(path, pcrSet);
    return pcrSet;
}

Example 2 with Axis

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

the class PathSummaryWriter method adaptPathForChangedNode.

/**
 * Adapt path summary either for moves or {@code setQName(QName)}.
 *
 * @param node the node for which the path node needs to be adapted
 * @param name the new {@link QName} in case of a new one is set, the old {@link QName} otherwise
 * @param nameKey nameKey of the new node
 * @param uriKey uriKey of the new node
 * @throws SirixException if a Sirix operation fails
 * @throws NullPointerException if {@code pNode} or {@code pQName} is null
 */
public void adaptPathForChangedNode(final ImmutableNameNode node, final QNm name, final int uriKey, final int prefixKey, final int localNameKey, final OPType type) throws SirixException {
    // Possibly either reset a path node or decrement its reference counter
    // and search for the new path node or insert it.
    movePathSummary();
    final long oldPathNodeKey = mPathSummaryReader.getNodeKey();
    // reference-counter would be 0).
    if (type == OPType.SETNAME && mPathSummaryReader.getReferences() == 1) {
        moveSummaryGetLevel(node);
        // Search for new path entry.
        final Axis axis = new FilterAxis(new ChildAxis(mPathSummaryReader), new NameFilter(mPathSummaryReader, Utils.buildName(name)), new PathKindFilter(mPathSummaryReader, node.getKind()));
        if (axis.hasNext()) {
            axis.next();
            // Found node.
            processFoundPathNode(oldPathNodeKey, mPathSummaryReader.getNodeKey(), node.getNodeKey(), uriKey, prefixKey, localNameKey, Remove.YES, type);
        } else {
            if (mPathSummaryReader.getKind() != Kind.DOCUMENT) {
                /* The path summary just needs to be updated for the new renamed node. */
                mPathSummaryReader.moveTo(oldPathNodeKey);
                final PathNode pathNode = (PathNode) mPageWriteTrx.prepareEntryForModification(mPathSummaryReader.getNodeKey(), PageKind.PATHSUMMARYPAGE, 0, Optional.<UnorderedKeyValuePage>empty());
                pathNode.setPrefixKey(prefixKey);
                pathNode.setLocalNameKey(localNameKey);
                pathNode.setURIKey(uriKey);
            }
        }
    } else {
        int level = moveSummaryGetLevel(node);
        // TODO: Johannes: Optimize? (either use this or use the name-mapping,
        // depending on the number of child nodes or nodes with a certain name).
        // Search for new path entry.
        final Axis axis = new FilterAxis(new ChildAxis(mPathSummaryReader), new NameFilter(mPathSummaryReader, Utils.buildName(name)), new PathKindFilter(mPathSummaryReader, node.getKind()));
        if (type == OPType.MOVEDSAMELEVEL || axis.hasNext()) {
            if (type != OPType.MOVEDSAMELEVEL) {
                axis.next();
            }
            // Found node.
            processFoundPathNode(oldPathNodeKey, mPathSummaryReader.getNodeKey(), node.getNodeKey(), uriKey, prefixKey, localNameKey, Remove.NO, type);
        } else {
            long nodeKey = mPathSummaryReader.getNodeKey();
            // Decrement reference count or remove path summary node.
            mNodeRtx.moveTo(node.getNodeKey());
            for (final Axis descendants = new PostOrderAxis(mNodeRtx, IncludeSelf.YES); descendants.hasNext(); ) {
                descendants.next();
                deleteOrDecrement();
                if (mNodeRtx.getKind() == Kind.ELEMENT) {
                    final ElementNode element = (ElementNode) mNodeRtx.getCurrentNode();
                    // Namespaces.
                    for (int i = 0, nsps = element.getNamespaceCount(); i < nsps; i++) {
                        mNodeRtx.moveToNamespace(i);
                        deleteOrDecrement();
                        mNodeRtx.moveToParent();
                    }
                    // Attributes.
                    for (int i = 0, atts = element.getAttributeCount(); i < atts; i++) {
                        mNodeRtx.moveToAttribute(i);
                        deleteOrDecrement();
                        mNodeRtx.moveToParent();
                    }
                }
            }
            mPathSummaryReader.moveTo(nodeKey);
            // Not found => create new path nodes for the whole subtree.
            boolean firstRun = true;
            for (final Axis descendants = new DescendantAxis(mNodeRtx, IncludeSelf.YES); descendants.hasNext(); ) {
                descendants.next();
                if (mNodeRtx.getKind() == Kind.ELEMENT) {
                    // Path Summary : New mapping.
                    if (firstRun) {
                        insertPathAsFirstChild(name, Kind.ELEMENT, ++level);
                        nodeKey = mPathSummaryReader.getNodeKey();
                    } else {
                        insertPathAsFirstChild(mNodeRtx.getName(), Kind.ELEMENT, ++level);
                    }
                    resetPathNodeKey(mNodeRtx.getNodeKey());
                    // Namespaces.
                    for (int i = 0, nsps = mNodeRtx.getNamespaceCount(); i < nsps; i++) {
                        mNodeRtx.moveToNamespace(i);
                        // Path Summary : New mapping.
                        insertPathAsFirstChild(mNodeRtx.getName(), Kind.NAMESPACE, level + 1);
                        resetPathNodeKey(mNodeRtx.getNodeKey());
                        mNodeRtx.moveToParent();
                        mPathSummaryReader.moveToParent();
                    }
                    // Attributes.
                    for (int i = 0, atts = mNodeRtx.getAttributeCount(); i < atts; i++) {
                        mNodeRtx.moveToAttribute(i);
                        // Path Summary : New mapping.
                        insertPathAsFirstChild(mNodeRtx.getName(), Kind.ATTRIBUTE, level + 1);
                        resetPathNodeKey(mNodeRtx.getNodeKey());
                        mNodeRtx.moveToParent();
                        mPathSummaryReader.moveToParent();
                    }
                    if (firstRun) {
                        firstRun = false;
                    } else {
                        mPathSummaryReader.moveToParent();
                        level--;
                    }
                }
            }
            // /*
            // * Remove path nodes with zero node references.
            // *
            // * (TODO: Johannes: might not be necessary, as it's likely that future
            // * updates will reinsert the path).
            // */
            // for (final long key : nodesToDelete) {
            // if (mPathSummaryReader.moveTo(key).hasMoved()) {
            // removePathSummaryNode(Remove.NO);
            // }
            // }
            mPathSummaryReader.moveTo(nodeKey);
        }
    }
}

Example 3 with Axis

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

the class PathSummaryWriter method removePathSummaryNode.

/**
 * Remove a path summary node with the specified PCR.
 *
 * @throws SirixException if Sirix fails to remove the path node
 */
private void removePathSummaryNode(final Remove remove) throws SirixException {
    // Remove all descendant nodes.
    if (remove == Remove.YES) {
        for (final Axis axis = new DescendantAxis(mPathSummaryReader); axis.hasNext(); ) {
            axis.next();
            mPathSummaryReader.removeMapping(mPathSummaryReader.getNodeKey());
            mPathSummaryReader.removeQNameMapping(mPathSummaryReader.getPathNode(), mPathSummaryReader.getName());
            mPageWriteTrx.removeEntry(mPathSummaryReader.getNodeKey(), PageKind.PATHSUMMARYPAGE, 0, Optional.<UnorderedKeyValuePage>empty());
        }
    }
    // Adapt left sibling node if there is one.
    if (mPathSummaryReader.hasLeftSibling()) {
        final StructNode leftSibling = (StructNode) mPageWriteTrx.prepareEntryForModification(mPathSummaryReader.getLeftSiblingKey(), PageKind.PATHSUMMARYPAGE, 0, Optional.<UnorderedKeyValuePage>empty());
        leftSibling.setRightSiblingKey(mPathSummaryReader.getRightSiblingKey());
    }
    // Adapt right sibling node if there is one.
    if (mPathSummaryReader.hasRightSibling()) {
        final StructNode rightSibling = (StructNode) mPageWriteTrx.prepareEntryForModification(mPathSummaryReader.getRightSiblingKey(), PageKind.PATHSUMMARYPAGE, 0, Optional.<UnorderedKeyValuePage>empty());
        rightSibling.setLeftSiblingKey(mPathSummaryReader.getLeftSiblingKey());
    }
    // Adapt parent. If node has no left sibling it is a first child.
    StructNode parent = (StructNode) mPageWriteTrx.prepareEntryForModification(mPathSummaryReader.getParentKey(), PageKind.PATHSUMMARYPAGE, 0, Optional.<UnorderedKeyValuePage>empty());
    if (!mPathSummaryReader.hasLeftSibling()) {
        parent.setFirstChildKey(mPathSummaryReader.getRightSiblingKey());
    }
    parent.decrementChildCount();
    // Remove node.
    mPathSummaryReader.removeMapping(mPathSummaryReader.getNodeKey());
    mPathSummaryReader.removeQNameMapping(mPathSummaryReader.getPathNode(), mPathSummaryReader.getName());
    mPageWriteTrx.removeEntry(mPathSummaryReader.getNodeKey(), PageKind.PATHSUMMARYPAGE, 0, Optional.<UnorderedKeyValuePage>empty());
}

Example 4 with Axis

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

the class ExpressionSingle method isDupOrd.

/**
 * Determines for a given string representation of an axis, whether this axis leads to duplicates
 * in the result sequence or not. Furthermore it determines the new state for the order state that
 * specifies, if the result sequence is in document order. This method is implemented according to
 * the automata in [Hidders, J., Michiels, P., "Avoiding Unnecessary Ordering Operations in
 * XPath", 2003]
 *
 * @param ax name of the current axis
 * @return true, if expression is still duplicate free
 */
public boolean isDupOrd(final Axis ax) {
    Axis axis = ax;
    while (axis instanceof FilterAxis) {
        axis = ((FilterAxis) axis).getAxis();
    }
    if (axis instanceof UnionAxis) {
        mOrd = mOrd.updateOrdUnion();
        mDup = mDup.updateUnion();
    } else if (axis instanceof ChildAxis) {
        mOrd = mOrd.updateOrdChild();
        mDup = mDup.updateDupChild();
    } else if (axis instanceof ParentAxis) {
        mOrd = mOrd.updateOrdParent();
        mDup = mDup.updateDupParent();
    } else if (axis instanceof DescendantAxis) {
        mOrd = mOrd.updateOrdDesc();
        mDup = mDup.updateDupDesc();
    } else if (axis instanceof AncestorAxis) {
        mOrd = mOrd.updateOrdAncestor();
        mDup = mDup.updateDupAncestor();
    } else if (axis instanceof FollowingAxis || axis instanceof PrecedingAxis) {
        mOrd = mOrd.updateOrdFollPre();
        mDup = mDup.updateDupFollPre();
    } else if (axis instanceof FollowingSiblingAxis || axis instanceof PrecedingSiblingAxis) {
        mOrd = mOrd.updateOrdFollPreSib();
        mDup = mDup.updateDupFollPreSib();
    }
    return !DupState.nodup;
}

Example 5 with Axis

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

the class ExpressionSingle method add.

/**
 * Adds a new Axis to the expression chain. The first axis that is added has to be stored till a
 * second axis is added. When the second axis is added, it is nested with the first one and builds
 * the execution chain.
 *
 * @param pAx the axis to add
 */
public void add(final Axis pAx) {
    Axis axis = pAx;
    if (isDupOrd(axis)) {
        axis = new DupFilterAxis(axis.getTrx(), axis);
        DupState.nodup = true;
    }
    switch(mNumber) {
        case 0:
            mFirstAxis = axis;
            mNumber++;
            break;
        case 1:
            mExpr = new NestedAxis(mFirstAxis, axis);
            mNumber++;
            break;
        default:
            final Axis cache = mExpr;
            mExpr = new NestedAxis(cache, axis);
    }
}