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1/*
2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#import "WebElementDictionary.h"
30
31#import "DOMNodeInternal.h"
32#import "WebDOMOperations.h"
33#import "WebFrame.h"
34#import "WebFrameInternal.h"
35#import "WebKitLogging.h"
36#import "WebTypesInternal.h"
37#import "WebView.h"
38#import "WebViewPrivate.h"
39#import <WebCore/Frame.h>
40#import <WebCore/HitTestResult.h>
41#import <WebCore/Image.h>
42#import <WebCore/WebCoreObjCExtras.h>
43#import <WebKit/DOMCore.h>
44#import <WebKit/DOMExtensions.h>
45#import <runtime/InitializeThreading.h>
46
47using namespace WebCore;
48
49static CFMutableDictionaryRef lookupTable = NULL;
50
51static void addLookupKey(NSString *key, SEL selector)
52{
53    CFDictionaryAddValue(lookupTable, key, selector);
54}
55
56static void cacheValueForKey(const void *key, const void *value, void *self)
57{
58    // calling objectForKey will cache the value in our _cache dictionary
59    [(WebElementDictionary *)self objectForKey:(NSString *)key];
60}
61
62@implementation WebElementDictionary
63
64+ (void)initialize
65{
66    JSC::initializeThreading();
67#ifndef BUILDING_ON_TIGER
68    WebCoreObjCFinalizeOnMainThread(self);
69#endif
70}
71
72+ (void)initializeLookupTable
73{
74    if (lookupTable)
75        return;
76
77    lookupTable = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFCopyStringDictionaryKeyCallBacks, NULL);
78
79    addLookupKey(WebElementDOMNodeKey, @selector(_domNode));
80    addLookupKey(WebElementFrameKey, @selector(_webFrame));
81    addLookupKey(WebElementImageAltStringKey, @selector(_altDisplayString));
82    addLookupKey(WebElementImageKey, @selector(_image));
83    addLookupKey(WebElementImageRectKey, @selector(_imageRect));
84    addLookupKey(WebElementImageURLKey, @selector(_absoluteImageURL));
85    addLookupKey(WebElementIsSelectedKey, @selector(_isSelected));
86    addLookupKey(WebElementSpellingToolTipKey, @selector(_spellingToolTip));
87    addLookupKey(WebElementTitleKey, @selector(_title));
88    addLookupKey(WebElementLinkURLKey, @selector(_absoluteLinkURL));
89    addLookupKey(WebElementLinkTargetFrameKey, @selector(_targetWebFrame));
90    addLookupKey(WebElementLinkTitleKey, @selector(_titleDisplayString));
91    addLookupKey(WebElementLinkLabelKey, @selector(_textContent));
92    addLookupKey(WebElementLinkIsLiveKey, @selector(_isLiveLink));
93    addLookupKey(WebElementIsContentEditableKey, @selector(_isContentEditable));
94}
95
96- (id)initWithHitTestResult:(const HitTestResult&)result
97{
98    [[self class] initializeLookupTable];
99    [super init];
100    _result = new HitTestResult(result);
101    return self;
102}
103
104- (void)dealloc
105{
106    if (WebCoreObjCScheduleDeallocateOnMainThread([WebElementDictionary class], self))
107        return;
108
109    delete _result;
110    [_cache release];
111    [_nilValues release];
112    [super dealloc];
113}
114
115- (void)finalize
116{
117    ASSERT_MAIN_THREAD();
118    delete _result;
119    [super finalize];
120}
121
122- (void)_fillCache
123{
124    CFDictionaryApplyFunction(lookupTable, cacheValueForKey, self);
125    _cacheComplete = YES;
126}
127
128- (NSUInteger)count
129{
130    if (!_cacheComplete)
131        [self _fillCache];
132    return [_cache count];
133}
134
135- (NSEnumerator *)keyEnumerator
136{
137    if (!_cacheComplete)
138        [self _fillCache];
139    return [_cache keyEnumerator];
140}
141
142- (id)objectForKey:(id)key
143{
144    id value = [_cache objectForKey:key];
145    if (value || _cacheComplete || [_nilValues containsObject:key])
146        return value;
147
148    SEL selector = (SEL)CFDictionaryGetValue(lookupTable, key);
149    if (!selector)
150        return nil;
151    value = [self performSelector:selector];
152
153    unsigned lookupTableCount = CFDictionaryGetCount(lookupTable);
154    if (value) {
155        if (!_cache)
156            _cache = [[NSMutableDictionary alloc] initWithCapacity:lookupTableCount];
157        [_cache setObject:value forKey:key];
158    } else {
159        if (!_nilValues)
160            _nilValues = [[NSMutableSet alloc] initWithCapacity:lookupTableCount];
161        [_nilValues addObject:key];
162    }
163
164    _cacheComplete = ([_cache count] + [_nilValues count]) == lookupTableCount;
165
166    return value;
167}
168
169- (DOMNode *)_domNode
170{
171    return kit(_result->innerNonSharedNode());
172}
173
174- (WebFrame *)_webFrame
175{
176    return [[[self _domNode] ownerDocument] webFrame];
177}
178
179// String's NSString* operator converts null Strings to empty NSStrings for compatibility
180// with AppKit. We need to work around that here.
181static NSString* NSStringOrNil(String coreString)
182{
183    if (coreString.isNull())
184        return nil;
185    return coreString;
186}
187
188- (NSString *)_altDisplayString
189{
190    return NSStringOrNil(_result->altDisplayString());
191}
192
193- (NSString *)_spellingToolTip
194{
195    TextDirection dir;
196    return NSStringOrNil(_result->spellingToolTip(dir));
197}
198
199- (NSImage *)_image
200{
201    Image* image = _result->image();
202    return image ? image->getNSImage() : nil;
203}
204
205- (NSValue *)_imageRect
206{
207    IntRect rect = _result->imageRect();
208    return rect.isEmpty() ? nil : [NSValue valueWithRect:rect];
209}
210
211- (NSURL *)_absoluteImageURL
212{
213    return _result->absoluteImageURL();
214}
215
216- (NSNumber *)_isSelected
217{
218    return [NSNumber numberWithBool:_result->isSelected()];
219}
220
221- (NSString *)_title
222{
223    TextDirection dir;
224    return NSStringOrNil(_result->title(dir));
225}
226
227- (NSURL *)_absoluteLinkURL
228{
229    return _result->absoluteLinkURL();
230}
231
232- (WebFrame *)_targetWebFrame
233{
234    return kit(_result->targetFrame());
235}
236
237- (NSString *)_titleDisplayString
238{
239    return NSStringOrNil(_result->titleDisplayString());
240}
241
242- (NSString *)_textContent
243{
244    return NSStringOrNil(_result->textContent());
245}
246
247- (NSNumber *)_isLiveLink
248{
249    return [NSNumber numberWithBool:_result->isLiveLink()];
250}
251
252- (NSNumber *)_isContentEditable
253{
254    return [NSNumber numberWithBool:_result->isContentEditable()];
255}
256
257@end
258