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// index.h
* Copyright (C) 2008 10gen Inc.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <>.
#pragma once
#include "../pch.h"
#include "diskloc.h"
#include "jsobj.h"
#include "indexkey.h"
namespace mongo {
/* Details about a particular index. There is one of these effectively for each object in
system.namespaces (although this also includes the head pointer, which is not in that
** MemoryMapped Record ** (i.e., this is on disk data)
class IndexDetails {
* btree head disk location
* TODO We should make this variable private, since btree operations
* may change its value and we don't want clients to rely on an old
* value. If we create a btree class, we can provide a btree object
* to clients instead of 'head'.
DiskLoc head;
/* Location of index info object. Format:
{ name:"nameofindex", ns:"parentnsname", key: {keypattobject}
[, unique: <bool>, background: <bool>]
This object is in the system.indexes collection. Note that since we
have a pointer to the object here, the object in system.indexes MUST NEVER MOVE.
DiskLoc info;
/* extract key value from the query object
e.g., if key() == { x : 1 },
{ x : 70, y : 3 } -> { x : 70 }
BSONObj getKeyFromQuery(const BSONObj& query) const {
BSONObj k = keyPattern();
BSONObj res = query.extractFieldsUnDotted(k);
return res;
/* pull out the relevant key objects from obj, so we
can index them. Note that the set is multiple elements
only when it's a "multikey" array.
keys will be left empty if key not found in the object.
void getKeysFromObject( const BSONObj& obj, BSONObjSetDefaultOrder& keys) const;
/* get the key pattern for this object.
e.g., { lastname:1, firstname:1 }
BSONObj keyPattern() const {
return info.obj().getObjectField("key");
* @return offset into keyPattern for key
-1 if doesn't exist
int keyPatternOffset( const string& key ) const;
bool inKeyPattern( const string& key ) const { return keyPatternOffset( key ) >= 0; }
/* true if the specified key is in the index */
bool hasKey(const BSONObj& key);
bool wouldCreateDup(const BSONObj& key, DiskLoc self);
// returns name of this index's storage area
// database.table.$index
string indexNamespace() const {
BSONObj io = info.obj();
string s;
s = io.getStringField("ns");
assert( !s.empty() );
s += ".$";
s += io.getStringField("name");
return s;
string indexName() const { // e.g. "ts_1"
BSONObj io = info.obj();
return io.getStringField("name");
static bool isIdIndexPattern( const BSONObj &pattern ) {
BSONObjIterator i(pattern);
BSONElement e =;
if( strcmp(e.fieldName(), "_id") != 0 ) return false;
/* returns true if this is the _id index. */
bool isIdIndex() const {
return isIdIndexPattern( keyPattern() );
/* gets not our namespace name (indexNamespace for that),
but the collection we index, its name.
string parentNS() const {
BSONObj io = info.obj();
return io.getStringField("ns");
bool unique() const {
BSONObj io = info.obj();
return io["unique"].trueValue() ||
/* temp: can we juse make unique:true always be there for _id and get rid of this? */
/* if set, when building index, if any duplicates, drop the duplicating object */
bool dropDups() const {
return info.obj().getBoolField( "dropDups" );
/* delete this index. does NOT clean up the system catalog
(system.indexes or system.namespaces) -- only NamespaceIndex.
void kill_idx();
const IndexSpec& getSpec() const;
string toString() const {
return info.obj().toString();
struct IndexChanges { /*on an update*/
BSONObjSetDefaultOrder oldkeys;
BSONObjSetDefaultOrder newkeys;
vector<BSONObj*> removed; // these keys were removed as part of the change
vector<BSONObj*> added; // these keys were added as part of the change
/** @curObjLoc - the object we want to add's location. if it is already in the
index, that is allowed here (for bg indexing case).
void dupCheck(IndexDetails& idx, DiskLoc curObjLoc) {
if( added.empty() || !idx.unique() )
for( vector<BSONObj*>::iterator i = added.begin(); i != added.end(); i++ ) {
bool dup = idx.wouldCreateDup(**i, curObjLoc);
uassert( 11001 , "E11001 duplicate key on update", !dup);
class NamespaceDetails;
// changedId should be initialized to false
void getIndexChanges(vector<IndexChanges>& v, NamespaceDetails& d, BSONObj newObj, BSONObj oldObj, bool &cangedId);
void dupCheck(vector<IndexChanges>& v, NamespaceDetails& d, DiskLoc curObjLoc);
} // namespace mongo
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