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101 lines
3.0 KiB
Objective-C
101 lines
3.0 KiB
Objective-C
//
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// RKManagedObjectSearchEngine.m
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// RestKit
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//
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// Created by Jeff Arena on 3/31/11.
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// Copyright (c) 2009-2012 RestKit. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#import "RKManagedObjectSearchEngine.h"
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#import "RKLog.h"
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// Set Logging Component
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#undef RKLogComponent
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#define RKLogComponent lcl_cRestKitCoreData
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@implementation RKManagedObjectSearchEngine
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static NSMutableCharacterSet* __removeSet;
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@synthesize mode = _mode;
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+ (id)searchEngine {
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RKManagedObjectSearchEngine* searchEngine = [[[RKManagedObjectSearchEngine alloc] init] autorelease];
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return searchEngine;
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}
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- (id)init {
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if (self = [super init]) {
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_mode = RKSearchModeOr;
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}
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return self;
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}
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#pragma mark -
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#pragma mark Private
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- (NSPredicate*)predicateForSearch:(NSArray*)searchTerms compoundSelector:(SEL)selector {
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NSMutableArray* termPredicates = [NSMutableArray array];
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for (NSString* searchTerm in searchTerms) {
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[termPredicates addObject:
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[NSPredicate predicateWithFormat:@"(ANY searchWords.word beginswith %@)", searchTerm]];
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}
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return [NSCompoundPredicate performSelector:selector withObject:termPredicates];
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}
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#pragma mark -
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#pragma mark Public
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+ (NSArray*)tokenizedNormalizedString:(NSString*)string {
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if (__removeSet == nil) {
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NSMutableCharacterSet* removeSet = [[NSCharacterSet alphanumericCharacterSet] mutableCopy];
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[removeSet formUnionWithCharacterSet:[NSCharacterSet whitespaceCharacterSet]];
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[removeSet invert];
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__removeSet = removeSet;
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}
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NSString* scannerString = [[[[string lowercaseString] decomposedStringWithCanonicalMapping]
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stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]
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stringByReplacingOccurrencesOfString:@"-" withString:@" "];
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NSArray* tokens = [[[scannerString componentsSeparatedByCharactersInSet:__removeSet]
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componentsJoinedByString:@""] componentsSeparatedByString:@" "];
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return tokens;
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}
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- (NSPredicate*)predicateForSearch:(NSString*)searchText {
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NSString* searchQuery = [searchText copy];
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NSArray* searchTerms = [RKManagedObjectSearchEngine tokenizedNormalizedString:searchQuery];
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[searchQuery release];
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if ([searchTerms count] == 0) {
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return nil;
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}
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if (_mode == RKSearchModeOr) {
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return [self predicateForSearch:searchTerms
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compoundSelector:@selector(orPredicateWithSubpredicates:)];
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} else if (_mode == RKSearchModeAnd) {
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return [self predicateForSearch:searchTerms
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compoundSelector:@selector(andPredicateWithSubpredicates:)];
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} else {
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return nil;
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}
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}
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@end
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