public ParseNode addChild(String newlabel) {
ParseNode child = new ParseNode(newlabel, -1);
children.addElement(child);
child.setParent(this);
return child;
}
public String getTerminal() {
ParseNode pn = children.elementAt(0);
if (pn == null) {
return null;
} else {
return pn.getLabel();
}
}
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;
}
public ParseNode getChild(String label) {
int i;
ParseNode p;
for (i = 0; i < children.size(); i++) {
p = children.elementAt(i);
if (p.getLabel().equals(label)) {
return p;
}
}
return null;
}
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 ParseNode insertChild(ParseNode child) {
if (child == null) {
throw new NullPointerException("Can't add null node to parse tree");
}
children.insertElementAt(child, 0);
child.setParent(this);
return child;
}
public int getLine() {
if (line >= 0) {
return line;
} else {
if (parent != null) {
return parent.getLine();
} else {
return 0;
}
}
}
public ParseNode getRoot() {
return (parent == null) ? this : parent.getRoot();
}