protected Node composeMappingNode(String anchor) {
MappingStartEvent startEvent = (MappingStartEvent) parser.getEvent();
String tag = startEvent.getTag();
Tag nodeTag;
boolean resolved = false;
if (tag == null || tag.equals("!")) {
nodeTag = resolver.resolve(NodeId.mapping, null, startEvent.getImplicit());
resolved = true;
} else {
nodeTag = new Tag(tag);
}
final List<NodeTuple> children = new ArrayList<NodeTuple>();
MappingNode node =
new MappingNode(
nodeTag,
resolved,
children,
startEvent.getStartMark(),
null,
startEvent.getFlowStyle());
if (anchor != null) {
anchors.put(anchor, node);
}
while (!parser.checkEvent(Event.ID.MappingEnd)) {
composeMappingChildren(children, node);
}
Event endEvent = parser.getEvent();
node.setEndMark(endEvent.getEndMark());
return node;
}
protected Node composeSequenceNode(String anchor) {
SequenceStartEvent startEvent = (SequenceStartEvent) parser.getEvent();
String tag = startEvent.getTag();
Tag nodeTag;
boolean resolved = false;
if (tag == null || tag.equals("!")) {
nodeTag = resolver.resolve(NodeId.sequence, null, startEvent.getImplicit());
resolved = true;
} else {
nodeTag = new Tag(tag);
}
final ArrayList<Node> children = new ArrayList<Node>();
SequenceNode node =
new SequenceNode(
nodeTag,
resolved,
children,
startEvent.getStartMark(),
null,
startEvent.getFlowStyle());
if (anchor != null) {
anchors.put(anchor, node);
}
while (!parser.checkEvent(Event.ID.SequenceEnd)) {
children.add(composeNode(node));
}
Event endEvent = parser.getEvent();
node.setEndMark(endEvent.getEndMark());
return node;
}
private Node composeDocument() {
// Drop the DOCUMENT-START event.
parser.getEvent();
// Compose the root node.
Node node = composeNode(null);
// Drop the DOCUMENT-END event.
parser.getEvent();
this.anchors.clear();
recursiveNodes.clear();
return node;
}
private Node composeNode(Node parent) {
recursiveNodes.add(parent);
if (parser.checkEvent(Event.ID.Alias)) {
AliasEvent event = (AliasEvent) parser.getEvent();
String anchor = event.getAnchor();
if (!anchors.containsKey(anchor)) {
throw new ComposerException(
null, null, "found undefined alias " + anchor, event.getStartMark());
}
Node result = anchors.get(anchor);
if (recursiveNodes.remove(result)) {
result.setTwoStepsConstruction(true);
}
return result;
}
NodeEvent event = (NodeEvent) parser.peekEvent();
String anchor = null;
anchor = event.getAnchor();
// the check for duplicate anchors has been removed (issue 174)
Node node = null;
if (parser.checkEvent(Event.ID.Scalar)) {
node = composeScalarNode(anchor);
} else if (parser.checkEvent(Event.ID.SequenceStart)) {
node = composeSequenceNode(anchor);
} else {
node = composeMappingNode(anchor);
}
recursiveNodes.remove(parent);
return node;
}
/**
* Checks if further documents are available.
*
* @return <code>true</code> if there is at least one more document.
*/
public boolean checkNode() {
// Drop the STREAM-START event.
if (parser.checkEvent(Event.ID.StreamStart)) {
parser.getEvent();
}
// If there are more documents available?
return !parser.checkEvent(Event.ID.StreamEnd);
}
/**
* Reads a document from a source that contains only one document.
*
* <p>If the stream contains more than one document an exception is thrown.
*
* @return The root node of the document or <code>null</code> if no document is available.
*/
public Node getSingleNode() {
// Drop the STREAM-START event.
parser.getEvent();
// Compose a document if the stream is not empty.
Node document = null;
if (!parser.checkEvent(Event.ID.StreamEnd)) {
document = composeDocument();
}
// Ensure that the stream contains no more documents.
if (!parser.checkEvent(Event.ID.StreamEnd)) {
Event event = parser.getEvent();
throw new ComposerException(
"expected a single document in the stream",
document.getStartMark(),
"but found another document",
event.getStartMark());
}
// Drop the STREAM-END event.
parser.getEvent();
return document;
}
protected Node composeScalarNode(String anchor) {
ScalarEvent ev = (ScalarEvent) parser.getEvent();
String tag = ev.getTag();
boolean resolved = false;
Tag nodeTag;
if (tag == null || tag.equals("!")) {
nodeTag =
resolver.resolve(
NodeId.scalar, ev.getValue(), ev.getImplicit().canOmitTagInPlainScalar());
resolved = true;
} else {
nodeTag = new Tag(tag);
}
Node node =
new ScalarNode(
nodeTag, resolved, ev.getValue(), ev.getStartMark(), ev.getEndMark(), ev.getStyle());
if (anchor != null) {
anchors.put(anchor, node);
}
return node;
}