|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Pinq\Providers\Utilities; |
|
4
|
|
|
|
|
5
|
|
|
use Pinq\Expressions as O; |
|
6
|
|
|
use Pinq\PinqException; |
|
7
|
|
|
use Pinq\Traversable; |
|
8
|
|
|
|
|
9
|
|
|
/** |
|
10
|
|
|
* Implementation of the query results collection that will |
|
11
|
|
|
* cache the query results and is able to evaluate queries in memory |
|
12
|
|
|
* when applicable parent values are loaded: |
|
13
|
|
|
* |
|
14
|
|
|
* <code> |
|
15
|
|
|
* $someRows = $queryable->where(function ($row) { return $row['id'] <= 50; }); |
|
16
|
|
|
* |
|
17
|
|
|
* foreach ($someRows as $row) { |
|
18
|
|
|
* //This will load the values |
|
19
|
|
|
* } |
|
20
|
|
|
* |
|
21
|
|
|
* //This should be evaluated in memory |
|
22
|
|
|
* $filteredRows = $someRows->where(function ($row) { return $row['isActive'] === true; }); |
|
23
|
|
|
* </code> |
|
24
|
|
|
* |
|
25
|
|
|
* @author Elliot Levin <[email protected]> |
|
26
|
|
|
*/ |
|
27
|
|
|
class QueryResultCollection implements IQueryResultCollection |
|
28
|
|
|
{ |
|
29
|
|
|
/** |
|
30
|
|
|
* @var \SplObjectStorage |
|
31
|
|
|
*/ |
|
32
|
|
|
protected $storage; |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* @var callable |
|
36
|
|
|
*/ |
|
37
|
|
|
protected $traversableFactory; |
|
38
|
|
|
|
|
39
|
|
|
public function __construct(callable $traversableFactory = null) |
|
40
|
|
|
{ |
|
41
|
|
|
$this->storage = new \SplObjectStorage(); |
|
42
|
|
|
$this->traversableFactory = $traversableFactory ?: Traversable::factory(); |
|
43
|
|
|
} |
|
44
|
|
|
|
|
45
|
|
|
public function optimizeQuery(O\Expression $queryExpression) |
|
46
|
|
|
{ |
|
47
|
|
|
//Converts all values requests (->asArray(), ->asIterator(), ->asCollection(), ->asTraversable()) |
|
48
|
|
|
//to ->asTrueIterator() such that the true underlying values are retrieved |
|
49
|
|
|
//and hence can be cached as a Traversable instance such that any queries |
|
50
|
|
|
//on scoped values can be evaluated in memory using the traversable implementation. |
|
51
|
|
|
if ($queryExpression instanceof O\MethodCallExpression) { |
|
52
|
|
|
$nameExpression = $queryExpression->getName(); |
|
53
|
|
|
if ($nameExpression instanceof O\ValueExpression) { |
|
54
|
|
|
switch (strtolower($nameExpression->getValue())) { |
|
55
|
|
|
case 'asarray': |
|
56
|
|
|
case 'asiterator': |
|
57
|
|
|
case 'ascollection': |
|
58
|
|
|
case 'astraversable': |
|
59
|
|
|
return $queryExpression->update( |
|
60
|
|
|
$queryExpression->getValue(), |
|
61
|
|
|
O\Expression::value('getTrueIterator'), |
|
62
|
|
|
$queryExpression->getArguments()); |
|
63
|
|
|
} |
|
64
|
|
|
} |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
return $queryExpression; |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
|
|
protected function removeGetTrueIteratorCall(O\Expression $queryExpression) |
|
71
|
|
|
{ |
|
72
|
|
|
//Removes the ->getTrueIterator() method call expression so when |
|
73
|
|
|
//searching for applicable results the expression will be a common ancestor |
|
74
|
|
|
if ($queryExpression instanceof O\MethodCallExpression) { |
|
75
|
|
|
$nameExpression = $queryExpression->getName(); |
|
76
|
|
|
if ($nameExpression instanceof O\ValueExpression) { |
|
77
|
|
|
if (strtolower($nameExpression->getValue()) === 'gettrueiterator') { |
|
78
|
|
|
return $queryExpression->getValue(); |
|
79
|
|
|
} |
|
80
|
|
|
} |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
|
|
return $queryExpression; |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
|
|
public function saveResults(O\Expression $expression, $results) |
|
87
|
|
|
{ |
|
88
|
|
|
$this->storage->attach($this->removeGetTrueIteratorCall($expression), $results); |
|
89
|
|
|
} |
|
90
|
|
|
|
|
91
|
|
|
public function clearResults() |
|
92
|
|
|
{ |
|
93
|
|
|
$this->storage = new \SplObjectStorage(); |
|
94
|
|
|
} |
|
95
|
|
|
|
|
96
|
|
|
public function removeResults(O\Expression $queryExpression) |
|
97
|
|
|
{ |
|
98
|
|
|
unset($this->storage[$queryExpression]); |
|
99
|
|
|
} |
|
100
|
|
|
|
|
101
|
|
|
public function tryComputeResults(O\Expression $queryExpression, &$results) |
|
102
|
|
|
{ |
|
103
|
|
|
if (isset($this->storage[$queryExpression])) { |
|
104
|
|
|
$results = $this->storage[$queryExpression]; |
|
105
|
|
|
|
|
106
|
|
|
return true; |
|
107
|
|
|
} |
|
108
|
|
|
|
|
109
|
|
|
$foundApplicableResults = false; |
|
110
|
|
|
|
|
111
|
|
|
//Searches the query expression tree and checks if any parent expressions have saved results |
|
112
|
|
|
//If so, the expression tree is updated with a Traversable implementation with the saved results |
|
113
|
|
|
$applicableScopeFinder = |
|
114
|
|
|
function (O\Expression $expression, O\ExpressionWalker $self) use (&$foundApplicableResults) { |
|
115
|
|
|
if (isset($this->storage[$expression])) { |
|
116
|
|
|
$foundApplicableResults = true; |
|
117
|
|
|
|
|
118
|
|
|
return O\Expression::value($this->newTraversable($this->storage[$expression])); |
|
119
|
|
|
} |
|
120
|
|
|
|
|
121
|
|
|
if ($expression instanceof O\ValueExpression) { |
|
122
|
|
|
return $expression; |
|
123
|
|
|
} |
|
124
|
|
|
|
|
125
|
|
|
/** @var $expression O\TraversalExpression */ |
|
126
|
|
|
|
|
127
|
|
|
return $expression->updateValue($self->walk($expression->getValue())); |
|
128
|
|
|
}; |
|
129
|
|
|
|
|
130
|
|
|
$traversalWalker = new O\DynamicExpressionWalker([ |
|
131
|
|
|
O\TraversalExpression::getType() => $applicableScopeFinder, |
|
132
|
|
|
O\ValueExpression::getType() => $applicableScopeFinder |
|
133
|
|
|
]); |
|
134
|
|
|
|
|
135
|
|
|
$remainingQueryExpression = $traversalWalker->walk($queryExpression); |
|
136
|
|
|
|
|
137
|
|
|
//If found applicable results, execute the updated expression tree against the Traversable |
|
138
|
|
|
//implementation to compute the result of the query. |
|
139
|
|
|
$results = $foundApplicableResults ? $remainingQueryExpression->evaluate() : null; |
|
140
|
|
|
|
|
141
|
|
|
return $foundApplicableResults; |
|
142
|
|
|
} |
|
143
|
|
|
|
|
144
|
|
|
public function computeResults(O\Expression $expression) |
|
145
|
|
|
{ |
|
146
|
|
|
if ($this->tryComputeResults($expression, $results)) { |
|
147
|
|
|
return $results; |
|
148
|
|
|
} |
|
149
|
|
|
|
|
150
|
|
|
throw new PinqException( |
|
151
|
|
|
'Could not compute query results: no applicable saved results found for the query expression, %s', |
|
152
|
|
|
$expression->compileDebug()); |
|
153
|
|
|
} |
|
154
|
|
|
|
|
155
|
|
|
protected function newTraversable($values) |
|
156
|
|
|
{ |
|
157
|
|
|
$factory = $this->traversableFactory; |
|
158
|
|
|
|
|
159
|
|
|
return $factory($values); |
|
160
|
|
|
} |
|
161
|
|
|
} |
|
162
|
|
|
|
TimeToogo /
Pinq
