mirror of
https://github.com/zhigang1992/RestKit.git
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98 lines
3.0 KiB
Objective-C
98 lines
3.0 KiB
Objective-C
//
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// RKSearchEngine.m
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// Two Toasters
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//
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// Created by Blake Watters on 8/26/09.
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// Copyright 2009 Two Toasters. All rights reserved.
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//
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#import "RKSearchEngine.h"
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@implementation RKSearchEngine
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@synthesize mode = _mode, tokenizeQuery = _tokenizeQuery, stripWhitespace = _stripWhitespace, caseSensitive = _caseSensitive;
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+ (id)searchEngine {
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return [[[RKSearchEngine alloc] init] autorelease];
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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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_tokenizeQuery = YES;
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_stripWhitespace = 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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if (_stripWhitespace) {
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return [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
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} else {
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return string;
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}
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}
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- (NSArray*)tokenizeOrCollect:(NSString*)string {
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if (_tokenizeQuery) {
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return [string componentsSeparatedByString:@" "];
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} else {
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return [NSArray arrayWithObject:string];
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}
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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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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 (_caseSensitive) {
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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 an and 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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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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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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