Examples with CoreChildNode org.apache.axiom.core.CoreChildNode used on opensource projects

Example 1 with CoreChildNode

use of org.apache.axiom.core.CoreChildNode in project webservices-axiom by apache.

the class AbstractNodeIterator method computeNext.

private void computeNext(Axis axis) {
    CoreNode node = currentNode;
    if (node instanceof CoreChildNode && ((CoreChildNode) node).coreGetParent() != currentParent) {
        throw new ConcurrentModificationException("The current node has been removed using a method other than Iterator#remove()");
    }
    try {
        while (true) {
            // Get to the next node
            switch(axis) {
                case CHILDREN:
                    if (node == null) {
                        node = startNode.coreGetFirstChild();
                    } else {
                        node = ((CoreChildNode) node).coreGetNextSibling();
                    }
                    break;
                case DESCENDANTS:
                case DESCENDANTS_OR_SELF:
                    if (node == null) {
                        if (axis == Axis.DESCENDANTS) {
                            node = startNode.coreGetFirstChild();
                            depth++;
                        } else {
                            node = startNode;
                        }
                    } else {
                        boolean visitChildren = true;
                        while (true) {
                            if (visitChildren && node instanceof CoreParentNode && semantics.isParentNode(node.coreGetNodeType())) {
                                CoreChildNode firstChild = ((CoreParentNode) node).coreGetFirstChild();
                                if (firstChild != null) {
                                    depth++;
                                    node = firstChild;
                                    break;
                                }
                            }
                            if (depth == 0) {
                                node = null;
                                break;
                            }
                            CoreChildNode nextSibling = ((CoreChildNode) node).coreGetNextSibling();
                            if (nextSibling != null) {
                                node = nextSibling;
                                break;
                            }
                            depth--;
                            node = ((CoreChildNode) node).coreGetParent();
                            visitChildren = false;
                        }
                    }
            }
            if (node == null) {
                nextNode = null;
                break;
            }
            if (type.isInstance(node)) {
                T candidate = type.cast(node);
                if (matches(candidate)) {
                    nextNode = candidate;
                    break;
                }
            }
        }
    } catch (CoreModelException ex) {
        throw semantics.toUncheckedException(ex);
    }
    hasNext = true;
}

Example 2 with CoreChildNode

use of org.apache.axiom.core.CoreChildNode in project webservices-axiom by apache.

the class TreeWalkerImpl method proceed.

@Override
public boolean proceed() throws StreamException {
    if (incremental && !handler.drain()) {
        return false;
    }
    try {
        // Determine the next node (i.e. the node for which the next event is generated) and
        // update the state
        final CoreNode previousNode = node;
        final CoreNode nextNode;
        if (state == STATE_PASS_THROUGH || state == STATE_STREAMING) {
            nextNode = previousNode;
        } else if (previousNode == null) {
            if (state == STATE_NONE && !(root instanceof CoreDocument)) {
                nextNode = null;
                state = STATE_START_FRAGMENT;
            } else {
                nextNode = root;
                state = STATE_NOT_VISITED;
            }
        } else if (state == STATE_VISITED && previousNode == root) {
            nextNode = null;
        } else if (state == STATE_NOT_VISITED && previousNode instanceof CoreElement) {
            final CoreElement element = (CoreElement) previousNode;
            // TODO: handle case with preserve == false
            CoreAttribute firstAttribute = element.coreGetFirstAttribute();
            if (firstAttribute == null) {
                nextNode = element;
                state = STATE_ATTRIBUTES_VISITED;
            } else {
                nextNode = firstAttribute;
                state = STATE_NOT_VISITED;
            }
        } else if (state == STATE_NOT_VISITED || state == STATE_ATTRIBUTES_VISITED) {
            final CoreParentNode parent = (CoreParentNode) previousNode;
            int nodeState = parent.getState();
            if (preserve || nodeState == CoreParentNode.COMPLETE || nodeState == CoreParentNode.COMPACT) {
                // TODO: bad because it will expand the node if the state is COMPACT
                CoreChildNode child = parent.coreGetFirstChild();
                if (child == null) {
                    nextNode = parent;
                    state = STATE_VISITED;
                } else {
                    nextNode = child;
                    state = STATE_NOT_VISITED;
                }
            } else {
                CoreChildNode child = parent.coreGetFirstChildIfAvailable();
                if (child == null) {
                    nextNode = parent;
                    if (nodeState == CoreParentNode.DISCARDING || nodeState == CoreParentNode.DISCARDED) {
                        throw new NodeConsumedException();
                    }
                    parent.coreGetInputContext().setPassThroughHandler(handler);
                    state = STATE_PASS_THROUGH;
                } else {
                    nextNode = child;
                    state = STATE_NOT_VISITED;
                }
            }
        } else if (previousNode instanceof CoreChildNode) {
            final CoreChildNode previousChildNode = (CoreChildNode) previousNode;
            if (preserve) {
                CoreChildNode sibling = previousChildNode.coreGetNextSibling();
                if (sibling == null) {
                    nextNode = previousChildNode.coreGetParent();
                    state = STATE_VISITED;
                } else {
                    nextNode = sibling;
                    state = STATE_NOT_VISITED;
                }
            } else {
                CoreChildNode sibling = previousChildNode.coreGetNextSiblingIfAvailable();
                if (sibling == null) {
                    CoreParentNode parent = previousChildNode.coreGetParent();
                    nextNode = parent;
                    int nodeState = parent.getState();
                    // TODO: <hack>
                    if (nodeState == CoreParentNode.INCOMPLETE && parent.coreGetInputContext() == null) {
                        nodeState = CoreParentNode.COMPLETE;
                    }
                    if (nodeState == CoreParentNode.COMPLETE) {
                        state = STATE_VISITED;
                    } else if (nodeState == CoreParentNode.DISCARDING || nodeState == CoreParentNode.DISCARDED) {
                        throw new NodeConsumedException();
                    } else {
                        parent.coreGetInputContext().setPassThroughHandler(handler);
                        state = STATE_PASS_THROUGH;
                    }
                } else {
                    nextNode = sibling;
                    state = STATE_NOT_VISITED;
                }
            }
        } else {
            final CoreAttribute attribute = (CoreAttribute) previousNode;
            // TODO: handle case with preserve == false
            CoreAttribute nextAttribute = attribute.coreGetNextAttribute();
            if (nextAttribute == null) {
                nextNode = attribute.coreGetOwnerElement();
                state = STATE_ATTRIBUTES_VISITED;
            } else {
                nextNode = nextAttribute;
                state = STATE_NOT_VISITED;
            }
        }
        // been visited yet. It may be a sourced element or a leaf node
        if (state == STATE_NOT_VISITED) {
            if (nextNode instanceof CoreNSAwareElement) {
                XmlInput input = ((CoreNSAwareElement) nextNode).getXmlInput(preserve, incremental);
                if (input != null) {
                    reader = input.createReader(new DocumentElementExtractingFilterHandler(handler));
                    state = STATE_STREAMING;
                }
            } else if (nextNode instanceof CoreLeafNode) {
                state = STATE_LEAF;
            } else if (nextNode instanceof CoreAttribute) {
                state = STATE_ATTRIBUTE;
            }
        }
        switch(state) {
            case STATE_START_FRAGMENT:
                handler.startFragment();
                break;
            case STATE_LEAF:
                ((CoreLeafNode) nextNode).internalSerialize(handler, preserve);
                break;
            case STATE_ATTRIBUTE:
                ((CoreAttribute) nextNode).internalSerialize(handler, preserve);
                break;
            case STATE_NOT_VISITED:
                ((CoreParentNode) nextNode).serializeStartEvent(handler);
                break;
            case STATE_ATTRIBUTES_VISITED:
                handler.attributesCompleted();
                break;
            case STATE_VISITED:
                if (nextNode == null) {
                    handler.completed();
                } else {
                    ((CoreParentNode) nextNode).serializeEndEvent(handler);
                }
                break;
            case STATE_PASS_THROUGH:
                {
                    CoreParentNode parent = (CoreParentNode) nextNode;
                    parent.coreGetInputContext().getBuilder().next();
                    if (parent.coreGetInputContext() == null) {
                        state = STATE_VISITED;
                    }
                    break;
                }
            case STATE_STREAMING:
                if (reader.proceed()) {
                    state = STATE_VISITED;
                    reader = null;
                }
                break;
            default:
                throw new IllegalStateException();
        }
        node = nextNode;
        return state == STATE_VISITED && (nextNode == null || nextNode instanceof CoreDocument);
    } catch (CoreModelException ex) {
        throw new CoreModelStreamException(ex);
    }
}