/**
* Returns the {@link RHSHistory history} of the types that have been selected most recently as
* right hand sides for the given type.
*
* @param lhs the fully qualified type name of an expected type for which right hand sides are
* requested, or <code>null</code>
* @return the right hand side history for the given type
*/
public RHSHistory getHistory(String lhs) {
MRUSet<String> rhsCache = fLHSCache.get(lhs);
if (rhsCache != null) {
int count = rhsCache.size();
LinkedHashMap<String, Integer> history =
new LinkedHashMap<String, Integer>((int) (count / 0.75));
int rank = 1;
for (Iterator<String> it = rhsCache.iterator(); it.hasNext(); rank++) {
String type = it.next();
history.put(type, new Integer(rank));
}
return new RHSHistory(history);
}
return EMPTY_HISTORY;
}
public void store(ContentAssistHistory history, StreamResult result) throws CoreException {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.newDocument();
Element rootElement = document.createElement(NODE_ROOT);
rootElement.setAttribute(ATTRIBUTE_MAX_LHS, Integer.toString(history.fMaxLHS));
rootElement.setAttribute(ATTRIBUTE_MAX_RHS, Integer.toString(history.fMaxRHS));
document.appendChild(rootElement);
for (Iterator<String> leftHandSides = history.fLHSCache.keySet().iterator();
leftHandSides.hasNext(); ) {
String lhs = leftHandSides.next();
Element lhsElement = document.createElement(NODE_LHS);
lhsElement.setAttribute(ATTRIBUTE_NAME, lhs);
rootElement.appendChild(lhsElement);
MRUSet<String> rightHandSides = history.fLHSCache.get(lhs);
for (Iterator<String> rhsIterator = rightHandSides.iterator(); rhsIterator.hasNext(); ) {
String rhs = rhsIterator.next();
Element rhsElement = document.createElement(NODE_RHS);
rhsElement.setAttribute(ATTRIBUTE_NAME, rhs);
lhsElement.appendChild(rhsElement);
}
}
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.METHOD, "xml"); // $NON-NLS-1$
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); // $NON-NLS-1$
transformer.setOutputProperty(OutputKeys.INDENT, "no"); // $NON-NLS-1$
DOMSource source = new DOMSource(document);
transformer.transform(source, result);
} catch (TransformerException e) {
throw createException(e, JavaTextMessages.ContentAssistHistory_serialize_error);
} catch (ParserConfigurationException e) {
throw createException(e, JavaTextMessages.ContentAssistHistory_serialize_error);
}
}