mirror of
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121 lines
3.8 KiB
Objective-C
121 lines
3.8 KiB
Objective-C
//
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// RKSearchEngine.m
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// RestKit
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//
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// Created by Blake Watters on 8/26/09.
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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 "RKSearchEngine.h"
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@implementation RKSearchEngine
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@synthesize mode;
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@synthesize tokenizeQuery;
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@synthesize stripsWhitespace;
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@synthesize caseSensitive;
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+ (id)searchEngine
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{
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return [[[RKSearchEngine alloc] init] autorelease];
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}
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- (id)init
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{
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self = [super init];
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if (self) {
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mode = RKSearchModeOr;
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tokenizeQuery = YES;
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stripsWhitespace = YES;
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caseSensitive = NO;
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}
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return self;
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}
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#pragma mark Private
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#pragma mark -
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- (NSString *)stripWhitespaceIfNecessary:(NSString *)string
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{
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if (stripsWhitespace) {
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return [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
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}
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return string;
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}
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- (NSArray *)tokenizeOrCollect:(NSString *)string
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{
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if (self.tokenizeQuery) {
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return [string componentsSeparatedByString:@" "];
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}
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return [NSArray arrayWithObject:string];
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}
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- (NSArray *)searchWithTerms:(NSArray*)searchTerms onProperties:(NSArray *)properties inCollection:(NSArray *)collection compoundSelector:(SEL)selector
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{
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NSPredicate *searchPredicate = nil;
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// do any of these properties contain all of these terms
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NSMutableArray *propertyPredicates = [NSMutableArray array];
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for (NSString *property in properties) {
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NSMutableArray *termPredicates = [NSMutableArray array];
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for (NSString *searchTerm in searchTerms) {
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NSPredicate *predicate;
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if (self.isCaseSensitive) {
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predicate = [NSPredicate predicateWithFormat:@"(%K contains %@)", property, searchTerm];
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} else {
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predicate = [NSPredicate predicateWithFormat:@"(%K contains[cd] %@)", property, searchTerm];
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}
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[termPredicates addObject:predicate];
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}
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// build a predicate for all of the search terms
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NSPredicate *termsPredicate = [NSCompoundPredicate performSelector:selector withObject:termPredicates];
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[propertyPredicates addObject:termsPredicate];
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}
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searchPredicate = [NSCompoundPredicate orPredicateWithSubpredicates:propertyPredicates];
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return [collection filteredArrayUsingPredicate:searchPredicate];
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}
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#pragma mark Public
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#pragma mark -
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- (NSArray *)searchFor:(NSString *)searchText inCollection:(NSArray *)collection
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{
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NSArray *properties = [NSArray arrayWithObject:@"searchableText"];
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return [self searchFor:searchText onProperties:properties inCollection:collection];
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}
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- (NSArray *)searchFor:(NSString *)searchText onProperties:(NSArray *)properties inCollection:(NSArray *)collection
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{
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NSString *searchQuery = [[searchText copy] autorelease];
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searchQuery = [self stripWhitespaceIfNecessary:searchQuery];
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NSArray *searchTerms = [self tokenizeOrCollect:searchQuery];
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if (mode == RKSearchModeOr) {
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return [self searchWithTerms:searchTerms onProperties:properties inCollection:collection compoundSelector:@selector(orPredicateWithSubpredicates:)];
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} else if (mode == RKSearchModeAnd) {
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return [self searchWithTerms:searchTerms onProperties:properties inCollection:collection 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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