Implemented new search engine for managed objects.

Code/Search/RKSearchPredicate.h

@@ -0,0 +1,45 @@
+//
+//  RKSearchPredicate.h
+//  RestKit
+//
+//  Created by Blake Watters on 7/27/12.
+//  Copyright (c) 2012 RestKit. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+/**
+ RKSearchPredicate is a suclass of NSCompoundPredicate used to represent
+ textual search operations against entities indexed by an instance of RKSearchIndexer.
+ 
+ @see RKSearchIndexer
+ */
+@interface RKSearchPredicate : NSCompoundPredicate
+
+/**
+ Creates and returns a new predicate for performing a full text search on an entity indexed
+ by an instance of RKSearchIndexer. The given search text will be tokenized, normalized and 
+ used to construct a collection of subpredicates specifying a BEGINSWITH match against the 
+ searchWords relationship of the searchable entity.
+ 
+ @param searchText A string of text with which to construct subpredicates for searching.
+ @param type The type of the new compound predicate.
+ @return A new compound predicate for performing a full text search with the given search text and type.
+ */
++ (NSPredicate *)searchPredicateWithText:(NSString *)searchText type:(NSCompoundPredicateType)type;
+
+/**
+ Initializes the receiver with a string of search text and a compound predicate type.
+ 
+ The search text will be tokenized, normalized and then used to construct an array of
+ subpredicates specifying a BEGINSWITH match against the searchWords relationship of the 
+ searchable entity.
+ 
+ @param searchText A string of text with which to construct subpredicates for searching.
+ @param type The type of the new compound predicate.
+ @return The receiver with its type set to the given type and its subpredicates set to an
+    array of subpredicates for searching for the given text.
+ */
+- (id)initWithSearchText:(NSString *)searchText type:(NSCompoundPredicateType)type;
+
+@end