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arangodb
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lookup function for keys

This commit is contained in:
Jan Steemann 2014-09-30 14:47:58 +02:00
parent b7f649803b
commit b78f54d94e
1 changed files with 25 additions and 0 deletions
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25
arangod/V8Server/v8-query.cpp
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@ -1200,6 +1200,30 @@ static v8::Handle<v8::Value> JS_Nth2Query (v8::Arguments const& argv) {
return scope.Close(result);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief @mchacki
////////////////////////////////////////////////////////////////////////////////
static v8::Handle<v8::Value> JS_Nth3Query (v8::Arguments const& argv) {
v8::HandleScope scope;
// expecting two arguments
if (argv.Length() != 2 || ! argv[0]->IsString() || ! argv[1]->IsNumber()) {
TRI_V8_EXCEPTION_USAGE(scope, "NTH3(<key>, <numberOfPartitions>)");
}
std::string const key(TRI_ObjectToString(argv[0]));
uint64_t const numberOfPartitions = TRI_ObjectToUInt64(argv[1], false);
if (numberOfPartitions == 0) {
TRI_V8_EXCEPTION_PARAMETER(scope, "invalid value for <numberOfPartitions>");
}
uint64_t hash = TRI_FnvHashPointer(static_cast<void const*>(key.c_str()), key.size());
return scope.Close(v8::Number::New(static_cast<int>(hash % numberOfPartitions)));
}
////////////////////////////////////////////////////////////////////////////////
/// @brief selects documents from a collection, using an offset into the
/// primary index. this can be used for incremental access
@ -2476,6 +2500,7 @@ void TRI_InitV8Queries (v8::Handle<v8::Context> context) {
// internal method. not intended to be used by end-users
TRI_AddMethodVocbase(rt, "NTH", JS_NthQuery, true);
TRI_AddMethodVocbase(rt, "NTH2", JS_Nth2Query, true);
TRI_AddMethodVocbase(rt, "NTH3", JS_Nth3Query, true);
// internal method. not intended to be used by end-users
TRI_AddMethodVocbase(rt, "OFFSET", JS_OffsetQuery, true);