@Override
public void handleRequest(final RestRequest request, final RestChannel channel) {
final ExplainRequest explainRequest =
new ExplainRequest(request.param("index"), request.param("type"), request.param("id"));
explainRequest.parent(request.param("parent"));
explainRequest.routing(request.param("routing"));
explainRequest.preference(request.param("preference"));
String sourceString = request.param("source");
String queryString = request.param("q");
if (request.hasContent()) {
explainRequest.source(request.content(), request.contentUnsafe());
} else if (sourceString != null) {
explainRequest.source(new BytesArray(request.param("source")), false);
} else if (queryString != null) {
QueryStringQueryBuilder queryStringBuilder = QueryBuilders.queryString(queryString);
queryStringBuilder.defaultField(request.param("df"));
queryStringBuilder.analyzer(request.param("analyzer"));
queryStringBuilder.analyzeWildcard(request.paramAsBoolean("analyze_wildcard", false));
queryStringBuilder.lowercaseExpandedTerms(
request.paramAsBoolean("lowercase_expanded_terms", true));
queryStringBuilder.lenient(request.paramAsBooleanOptional("lenient", null));
String defaultOperator = request.param("default_operator");
if (defaultOperator != null) {
if ("OR".equals(defaultOperator)) {
queryStringBuilder.defaultOperator(QueryStringQueryBuilder.Operator.OR);
} else if ("AND".equals(defaultOperator)) {
queryStringBuilder.defaultOperator(QueryStringQueryBuilder.Operator.AND);
} else {
throw new ElasticSearchIllegalArgumentException(
"Unsupported defaultOperator [" + defaultOperator + "], can either be [OR] or [AND]");
}
}
ExplainSourceBuilder explainSourceBuilder = new ExplainSourceBuilder();
explainSourceBuilder.query(queryStringBuilder);
explainRequest.source(explainSourceBuilder);
}
client.explain(
explainRequest,
new ActionListener<ExplainResponse>() {
@Override
public void onResponse(ExplainResponse response) {
try {
XContentBuilder builder = restContentBuilder(request);
builder.startObject();
builder.field(Fields.OK, response.exists());
builder.field(Fields.MATCHES, response.match());
if (response.hasExplanation()) {
builder.startObject(Fields.EXPLANATION);
buildExplanation(builder, response.explanation());
builder.endObject();
}
builder.endObject();
channel.sendResponse(
new XContentRestResponse(request, response.exists() ? OK : NOT_FOUND, builder));
} catch (Exception e) {
onFailure(e);
}
}
private void buildExplanation(XContentBuilder builder, Explanation explanation)
throws IOException {
builder.field(Fields.VALUE, explanation.getValue());
builder.field(Fields.DESCRIPTION, explanation.getDescription());
Explanation[] innerExps = explanation.getDetails();
if (innerExps != null) {
builder.startArray(Fields.DETAILS);
for (Explanation exp : innerExps) {
builder.startObject();
buildExplanation(builder, exp);
builder.endObject();
}
builder.endArray();
}
}
@Override
public void onFailure(Throwable e) {
try {
channel.sendResponse(new XContentThrowableRestResponse(request, e));
} catch (IOException e1) {
logger.error("Failed to send failure response", e1);
}
}
});
}
