/**
* Constructs the AggregatorParsers out of all the given parsers
*
* @param parsers The available aggregator parsers (dynamically injected by the {@link
* org.elasticsearch.search.aggregations.AggregationModule}).
*/
@Inject
public AggregatorParsers(Set<Aggregator.Parser> parsers) {
MapBuilder<String, Aggregator.Parser> builder = MapBuilder.newMapBuilder();
for (Aggregator.Parser parser : parsers) {
builder.put(parser.type(), parser);
}
this.parsers = builder.immutableMap();
}
private AggregatorFactories parseAggregators(
XContentParser parser, SearchContext context, int level) throws IOException {
Matcher validAggMatcher = VALID_AGG_NAME.matcher("");
AggregatorFactories.Builder factories = new AggregatorFactories.Builder();
XContentParser.Token token = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token != XContentParser.Token.FIELD_NAME) {
throw new SearchParseException(
context,
"Unexpected token "
+ token
+ " in [aggs]: aggregations definitions must start with the name of the aggregation.");
}
final String aggregationName = parser.currentName();
if (!validAggMatcher.reset(aggregationName).matches()) {
throw new SearchParseException(
context,
"Invalid aggregation name ["
+ aggregationName
+ "]. Aggregation names must be alpha-numeric and can only contain '_' and '-'");
}
token = parser.nextToken();
if (token != XContentParser.Token.START_OBJECT) {
throw new SearchParseException(
context,
"Aggregation definition for ["
+ aggregationName
+ " starts with a ["
+ token
+ "], expected a ["
+ XContentParser.Token.START_OBJECT
+ "].");
}
AggregatorFactory factory = null;
AggregatorFactories subFactories = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token != XContentParser.Token.FIELD_NAME) {
throw new SearchParseException(
context,
"Expected ["
+ XContentParser.Token.FIELD_NAME
+ "] under a ["
+ XContentParser.Token.START_OBJECT
+ "], but got a ["
+ token
+ "] in ["
+ aggregationName
+ "]");
}
final String fieldName = parser.currentName();
token = parser.nextToken();
if ("aggregations_binary".equals(fieldName)) {
if (subFactories != null) {
throw new SearchParseException(
context, "Found two sub aggregation definitions under [" + aggregationName + "]");
}
XContentParser binaryParser = null;
if (token == XContentParser.Token.VALUE_STRING
|| token == XContentParser.Token.VALUE_EMBEDDED_OBJECT) {
byte[] source = parser.binaryValue();
binaryParser = XContentFactory.xContent(source).createParser(source);
} else {
throw new SearchParseException(
context,
"Expected ["
+ XContentParser.Token.VALUE_STRING
+ " or "
+ XContentParser.Token.VALUE_EMBEDDED_OBJECT
+ "] for ["
+ fieldName
+ "], but got a ["
+ token
+ "] in ["
+ aggregationName
+ "]");
}
XContentParser.Token binaryToken = binaryParser.nextToken();
if (binaryToken != XContentParser.Token.START_OBJECT) {
throw new SearchParseException(
context,
"Expected ["
+ XContentParser.Token.START_OBJECT
+ "] as first token when parsing ["
+ fieldName
+ "], but got a ["
+ binaryToken
+ "] in ["
+ aggregationName
+ "]");
}
subFactories = parseAggregators(binaryParser, context, level + 1);
} else if (token == XContentParser.Token.START_OBJECT) {
switch (fieldName) {
case "aggregations":
case "aggs":
if (subFactories != null) {
throw new SearchParseException(
context,
"Found two sub aggregation definitions under [" + aggregationName + "]");
}
subFactories = parseAggregators(parser, context, level + 1);
break;
default:
if (factory != null) {
throw new SearchParseException(
context,
"Found two aggregation type definitions in ["
+ aggregationName
+ "]: ["
+ factory.type
+ "] and ["
+ fieldName
+ "]");
}
Aggregator.Parser aggregatorParser = parser(fieldName);
if (aggregatorParser == null) {
throw new SearchParseException(
context,
"Could not find aggregator type ["
+ fieldName
+ "] in ["
+ aggregationName
+ "]");
}
factory = aggregatorParser.parse(aggregationName, parser, context);
}
} else {
throw new SearchParseException(
context,
"Expected ["
+ XContentParser.Token.START_OBJECT
+ "] under ["
+ fieldName
+ "], but got a ["
+ token
+ "] in ["
+ aggregationName
+ "]");
}
}
if (factory == null) {
throw new SearchParseException(
context, "Missing definition for aggregation [" + aggregationName + "]");
}
if (subFactories != null) {
factory.subFactories(subFactories);
}
if (level == 0) {
factory.validate();
}
factories.add(factory);
}
return factories.build();
}
