// TODO: maybe pass this Logger to the template for logging from there?
// private static final Logger log = LoggerFactory.getLogger(VelocityResponseWriter.class);
public void write(Writer writer, SolrQueryRequest request, SolrQueryResponse response) throws IOException {
VelocityEngine engine = getEngine(request); // TODO: have HTTP headers available for configuring engine
Template template = getTemplate(engine, request);
VelocityContext context = new VelocityContext();
context.put("request", request);
// Turn the SolrQueryResponse into a SolrResponse.
// QueryResponse has lots of conveniences suitable for a view
// Problem is, which SolrResponse class to use?
// One patch to SOLR-620 solved this by passing in a class name as
// as a parameter and using reflection and Solr's class loader to
// create a new instance. But for now the implementation simply
// uses QueryResponse, and if it chokes in a known way, fall back
// to bare bones SolrResponseBase.
// TODO: Can this writer know what the handler class is? With echoHandler=true it can get its string name at least
SolrResponse rsp = new QueryResponse();
NamedList<Object> parsedResponse = BinaryResponseWriter.getParsedResponse(request, response);
try {
rsp.setResponse(parsedResponse);
// page only injected if QueryResponse works
context.put("page", new PageTool(request, response)); // page tool only makes sense for a SearchHandler request... *sigh*
} catch (ClassCastException e) {
// known edge case where QueryResponse's extraction assumes "response" is a SolrDocumentList
// (AnalysisRequestHandler emits a "response")
e.printStackTrace();
rsp = new SolrResponseBase();
rsp.setResponse(parsedResponse);
}
context.put("response", rsp);
// Velocity context tools - TODO: make these pluggable
context.put("esc", new EscapeTool());
context.put("date", new ComparisonDateTool());
context.put("list", new ListTool());
context.put("math", new MathTool());
context.put("number", new NumberTool());
context.put("sort", new SortTool());
context.put("engine", engine); // for $engine.resourceExists(...)
String layout_template = request.getParams().get("v.layout");
String json_wrapper = request.getParams().get("v.json");
boolean wrap_response = (layout_template != null) || (json_wrapper != null);
// create output, optionally wrap it into a json object
if (wrap_response) {
StringWriter stringWriter = new StringWriter();
template.merge(context, stringWriter);
if (layout_template != null) {
context.put("content", stringWriter.toString());
stringWriter = new StringWriter();
try {
engine.getTemplate(layout_template + ".vm").merge(context, stringWriter);
} catch (Exception e) {
throw new IOException(e.getMessage());
}
}