private Element makeTerm(Document doc, TablesRevisionProblem problem, Field field)
throws RenderException {
assert field != null;
Element element = doc.createElement("term");
if (field.equals(problem.getFraction())) {
Element child = doc.createElement("numerator");
child.setTextContent("1");
element.appendChild(child);
child = doc.createElement("denominator");
child.setTextContent(String.valueOf(problem.getValue(field)));
if (field.equals(problem.getBlank())) {
setBlank(element);
}
element.appendChild(child);
} else {
if (field.equals(problem.getBlank())) {
setBlank(element);
}
element.setTextContent(String.valueOf(problem.getValue(field)));
}
return element;
}
private Element makeRHS(Document doc, TablesRevisionProblem problem) throws RenderException {
Element element = doc.createElement("answer");
element.setTextContent(String.valueOf(problem.getAnswer()));
if (Field.ANSWER.equals(problem.getBlank())) {
setBlank(element);
}
return element;
}
@Override
protected Element renderProblem(
DOMRenderContext context, Document doc, TablesRevisionProblem problem)
throws RenderException {
if (problem == null) {
return null;
}
if (doc == null) {
throw new NullPointerException("Document is null");
}
Element lhs = makeLHS(doc, problem);
Element rhs = makeRHS(doc, problem);
Element element = doc.createElement(DOMRenderContext.TAG_PROBLEM);
element.setAttribute("type", TablesRevision.EXERCISE_ID);
if (problem.getFlip()) {
element.appendChild(rhs);
element.appendChild(doc.createElement("equals"));
element.appendChild(lhs);
} else {
element.appendChild(lhs);
element.appendChild(doc.createElement("equals"));
element.appendChild(rhs);
}
return element;
}
private Element makeLHS(Document doc, TablesRevisionProblem problem) throws RenderException {
Element element = doc.createElement(problem.isDivide() ? "divide" : "multiply");
element.appendChild(makeTerm(doc, problem, Field.TERM1));
element.appendChild(makeTerm(doc, problem, Field.TERM2));
return element;
}