public Edge addSecondaryEdge(ComparableNode source, ComparableNode target)
throws MaltChainedException {
if (source == null || target == null) {
throw new SyntaxGraphException("Head or dependent node is missing.");
} else if (!target.isRoot()) {
Edge e = edgePool.checkOut();
e.setBelongsToGraph(this);
e.setEdge((Node) source, (Node) target, Edge.SECONDARY_EDGE);
graphEdges.add(e);
return e;
}
return null;
}
protected Edge addDependencyEdge(DependencyNode head, DependencyNode dependent)
throws MaltChainedException {
if (head == null || dependent == null) {
throw new SyntaxGraphException("Head or dependent node is missing.");
} else if (!dependent.isRoot()) {
if (singleHeadedConstraint && dependent.hasHead()) {
return moveDependencyEdge(head, dependent);
}
DependencyNode hc = ((DependencyNode) head).findComponent();
DependencyNode dc = ((DependencyNode) dependent).findComponent();
if (hc != dc) {
link(hc, dc);
numberOfComponents--;
}
Edge e = edgePool.checkOut();
e.setBelongsToGraph(this);
e.setEdge((Node) head, (Node) dependent, Edge.DEPENDENCY_EDGE);
graphEdges.add(e);
return e;
} else {
throw new SyntaxGraphException("Head node is not a root node or a terminal node.");
}
}
