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//
// TD_Database+Insertion.h
// TouchDB
//
// Created by Jens Alfke on 1/18/12.
// Copyright (c) 2012 Couchbase, Inc. All rights reserved.
//
#import <TouchDB/TD_Database.h>
@protocol TD_ValidationContext;
/** Validation block, used to approve revisions being added to the database. */
typedef BOOL (^TD_ValidationBlock) (TD_Revision* newRevision,
id<TD_ValidationContext> context);
@interface TD_Database (Insertion)
+ (BOOL) isValidDocumentID: (NSString*)str;
+ (NSString*) generateDocumentID;
/** Stores a new (or initial) revision of a document. This is what's invoked by a PUT or POST. As with those, the previous revision ID must be supplied when necessary and the call will fail if it doesn't match.
@param revision The revision to add. If the docID is nil, a new UUID will be assigned. Its revID must be nil. It must have a JSON body.
@param prevRevID The ID of the revision to replace (same as the "?rev=" parameter to a PUT), or nil if this is a new document.
@param allowConflict If NO, an error status kTDStatusConflict will be returned if the insertion would create a conflict, i.e. if the previous revision already has a child.
@param status On return, an HTTP status code indicating success or failure.
@return A new TD_Revision with the docID, revID and sequence filled in (but no body). */
- (TD_Revision*) putRevision: (TD_Revision*)revision
prevRevisionID: (NSString*)prevRevID
allowConflict: (BOOL)allowConflict
status: (TDStatus*)outStatus;
/** Inserts an already-existing revision replicated from a remote database. It must already have a revision ID. This may create a conflict! The revision's history must be given; ancestor revision IDs that don't already exist locally will create phantom revisions with no content. */
- (TDStatus) forceInsert: (TD_Revision*)rev
revisionHistory: (NSArray*)history
source: (NSURL*)source;
/** Parses the _revisions dict from a document into an array of revision ID strings */
+ (NSArray*) parseCouchDBRevisionHistory: (NSDictionary*)docProperties;
/** Define or clear a named document validation function. */
- (void) defineValidation: (NSString*)validationName asBlock: (TD_ValidationBlock)validationBlock;
- (TD_ValidationBlock) validationNamed: (NSString*)validationName;
/** Compacts the database storage by removing the bodies and attachments of obsolete revisions. */
- (TDStatus) compact;
/** Purges specific revisions, which deletes them completely from the local database _without_ adding a "tombstone" revision. It's as though they were never there.
@param docsToRevs A dictionary mapping document IDs to arrays of revision IDs.
@param outResult On success will point to an NSDictionary with the same form as docsToRev, containing the doc/revision IDs that were actually removed. */
- (TDStatus) purgeRevisions: (NSDictionary*)docsToRevs
result: (NSDictionary**)outResult;
@end
typedef BOOL (^TDChangeEnumeratorBlock) (NSString* key, id oldValue, id newValue);
/** Context passed into a TDValidationBlock. */
@protocol TD_ValidationContext <NSObject>
/** The contents of the current revision of the document, or nil if this is a new document. */
@property (readonly) TD_Revision* currentRevision;
/** The type of HTTP status to report, if the validate block returns NO.
The default value is 403 ("Forbidden"). */
@property TDStatus errorType;
/** The error message to return in the HTTP response, if the validate block returns NO.
The default value is "invalid document". */
@property (copy) NSString* errorMessage;
/** Returns an array of all the keys whose values are different between the current and new revisions. */
@property (readonly) NSArray* changedKeys;
/** Returns YES if only the keys given in the 'allowedKeys' array have changed; else returns NO and sets a default error message naming the offending key. */
- (BOOL) allowChangesOnlyTo: (NSArray*)allowedKeys;
/** Returns YES if none of the keys given in the 'disallowedKeys' array have changed; else returns NO and sets a default error message naming the offending key. */
- (BOOL) disallowChangesTo: (NSArray*)disallowedKeys;
/** Calls the 'enumerator' block for each key that's changed, passing both the old and new values.
If the block returns NO, the enumeration stops and sets a default error message, and the method returns NO; else the method returns YES. */
- (BOOL) enumerateChanges: (TDChangeEnumeratorBlock)enumerator;
@end
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