1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
//
// GTMCalculatedRange.m
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMCalculatedRange.h"
// Our internal storage type. It keeps track of an item and it's
// position.
@interface GTMCalculatedRangeStopPrivate : NSObject {
id item_; // the item (STRONG)
CGFloat position_; //
}
+ (id)stopWithObject:(id)item position:(CGFloat)inPosition;
- (id)initWithObject:(id)item position:(CGFloat)inPosition;
- (id)item;
- (CGFloat)position;
@end
GTM_INLINE BOOL FPEqual(CGFloat a, CGFloat b) {
return (fpclassify(a - b) == FP_ZERO);
}
@implementation GTMCalculatedRangeStopPrivate
+ (id)stopWithObject:(id)item position:(CGFloat)inPosition {
return [[[self alloc] initWithObject:item position:inPosition] autorelease];
}
- (id)initWithObject:(id)item position:(CGFloat)inPosition {
self = [super init];
if (self != nil) {
item_ = [item retain];
position_ = inPosition;
}
return self;
}
- (void)dealloc {
[item_ release];
[super dealloc];
}
- (id)item {
return item_;
}
- (CGFloat)position {
return position_;
}
- (NSString *)description {
return [NSString stringWithFormat: @"%f %@", position_, item_];
}
@end
@implementation GTMCalculatedRange
- (id)init {
self = [super init];
if (self != nil) {
storage_ = [[NSMutableArray arrayWithCapacity:0] retain];
}
return self;
}
- (void)dealloc {
[storage_ release];
[super dealloc];
}
- (void)insertStop:(id)item atPosition:(CGFloat)position {
NSUInteger positionIndex = 0;
GTMCalculatedRangeStopPrivate *theStop;
GTM_FOREACH_OBJECT(theStop, storage_) {
if ([theStop position] < position) {
positionIndex += 1;
}
else if (FPEqual([theStop position], position)) {
// remove and stop the enum since we just modified the object
[storage_ removeObjectAtIndex:positionIndex];
break;
}
}
[storage_ insertObject:[GTMCalculatedRangeStopPrivate stopWithObject:item position:position]
atIndex:positionIndex];
}
- (BOOL)removeStopAtPosition:(CGFloat)position {
NSUInteger positionIndex = 0;
BOOL foundStop = NO;
GTMCalculatedRangeStopPrivate *theStop;
GTM_FOREACH_OBJECT(theStop, storage_) {
if (FPEqual([theStop position], position)) {
break;
} else {
positionIndex += 1;
}
}
if (nil != theStop) {
[self removeStopAtIndex:positionIndex];
foundStop = YES;
}
return foundStop;
}
- (void)removeStopAtIndex:(NSUInteger)positionIndex {
[storage_ removeObjectAtIndex:positionIndex];
}
- (NSUInteger)stopCount {
return [storage_ count];
}
- (id)stopAtIndex:(NSUInteger)positionIndex position:(CGFloat*)outPosition {
GTMCalculatedRangeStopPrivate *theStop = [storage_ objectAtIndex:positionIndex];
if (nil != outPosition) {
*outPosition = [theStop position];
}
return [theStop item];
}
- (id)valueAtPosition:(CGFloat)position {
id theValue = nil;
GTMCalculatedRangeStopPrivate *theStop;
GTM_FOREACH_OBJECT(theStop, storage_) {
if (FPEqual([theStop position], position)) {
theValue = [theStop item];
break;
}
}
return theValue;
}
- (NSString *)description {
return [storage_ description];
}
@end
|
