public ParseNode addChild(String newlabel) {
ParseNode child = new ParseNode(newlabel, -1);
children.addElement(child);
child.setParent(this);
return child;
}
public ParseNode addChild(ParseNode child) {
if (child == null) throw new NullPointerException("Can't add null node to parse tree");
children.addElement(child);
child.setParent(this);
return child;
}
public ParseNodeVector getChildren(String label) {
int i;
ParseNodeVector v = new ParseNodeVector();
for (i = 0; i < children.size(); i++) {
ParseNode pn = children.elementAt(i);
if (pn.getLabel().equals(label)) v.addElement(pn);
}
return v;
}