private FieldSelector buildFieldSelectors(DocumentMapper docMapper, String... fields) {
if (fields == null) {
return docMapper.sourceMapper().fieldSelector();
}
// don't load anything
if (fields.length == 0) {
return null;
}
FieldMappersFieldSelector fieldSelector = null;
for (String fieldName : fields) {
FieldMappers x = docMapper.mappers().smartName(fieldName);
if (x != null && x.mapper().stored()) {
if (fieldSelector == null) {
fieldSelector = new FieldMappersFieldSelector();
}
fieldSelector.add(x);
}
}
return fieldSelector;
}
@Override
protected GetResponse shardOperation(GetRequest request, int shardId)
throws ElasticSearchException {
IndexService indexService = indicesService.indexServiceSafe(request.index());
BloomCache bloomCache = indexService.cache().bloomCache();
IndexShard indexShard = indexService.shardSafe(shardId);
DocumentMapper docMapper = indexService.mapperService().documentMapper(request.type());
if (docMapper == null) {
throw new TypeMissingException(new Index(request.index()), request.type());
}
if (request.refresh()) {
indexShard.refresh(new Engine.Refresh(false));
}
Engine.Searcher searcher = indexShard.searcher();
boolean exists = false;
byte[] source = null;
Map<String, GetField> fields = null;
long version = -1;
try {
UidField.DocIdAndVersion docIdAndVersion =
loadCurrentVersionFromIndex(
bloomCache, searcher, docMapper.uidMapper().term(request.type(), request.id()));
if (docIdAndVersion != null && docIdAndVersion.docId != Lucene.NO_DOC) {
if (docIdAndVersion.version > 0) {
version = docIdAndVersion.version;
}
exists = true;
FieldSelector fieldSelector = buildFieldSelectors(docMapper, request.fields());
if (fieldSelector != null) {
Document doc = docIdAndVersion.reader.document(docIdAndVersion.docId, fieldSelector);
source = extractSource(doc, docMapper);
for (Object oField : doc.getFields()) {
Fieldable field = (Fieldable) oField;
String name = field.name();
Object value = null;
FieldMappers fieldMappers = docMapper.mappers().indexName(field.name());
if (fieldMappers != null) {
FieldMapper mapper = fieldMappers.mapper();
if (mapper != null) {
name = mapper.names().fullName();
value = mapper.valueForSearch(field);
}
}
if (value == null) {
if (field.isBinary()) {
value = field.getBinaryValue();
} else {
value = field.stringValue();
}
}
if (fields == null) {
fields = newHashMapWithExpectedSize(2);
}
GetField getField = fields.get(name);
if (getField == null) {
getField = new GetField(name, new ArrayList<Object>(2));
fields.put(name, getField);
}
getField.values().add(value);
}
}
// now, go and do the script thingy if needed
if (request.fields() != null && request.fields().length > 0) {
SearchLookup searchLookup = null;
for (String field : request.fields()) {
String script = null;
if (field.contains("_source.") || field.contains("doc[")) {
script = field;
} else {
FieldMappers x = docMapper.mappers().smartName(field);
if (x != null && !x.mapper().stored()) {
script = "_source." + x.mapper().names().fullName();
}
}
if (script != null) {
if (searchLookup == null) {
searchLookup =
new SearchLookup(
indexService.mapperService(), indexService.cache().fieldData());
}
SearchScript searchScript = scriptService.search(searchLookup, "mvel", script, null);
searchScript.setNextReader(docIdAndVersion.reader);
searchScript.setNextDocId(docIdAndVersion.docId);
try {
Object value = searchScript.run();
if (fields == null) {
fields = newHashMapWithExpectedSize(2);
}
GetField getField = fields.get(field);
if (getField == null) {
getField = new GetField(field, new ArrayList<Object>(2));
fields.put(field, getField);
}
getField.values().add(value);
} catch (RuntimeException e) {
if (logger.isTraceEnabled()) {
logger.trace("failed to execute get request script field [{}]", e, script);
}
// ignore
}
}
}
}
}
} catch (IOException e) {
throw new ElasticSearchException(
"Failed to get type [" + request.type() + "] and id [" + request.id() + "]", e);
} finally {
searcher.release();
}
return new GetResponse(
request.index(), request.type(), request.id(), version, exists, source, fields);
}