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Completed
Push — master ( 0c8b13...b1ee3a )
by Thomas
02:04
created

RandomIterator::getIterator()   A

↳ Parent: RandomIterator

Complexity

Conditions 3
Paths 2

Size

Total Lines 13
Code Lines 10

Duplication

Lines 0
Ratio 0 %

Code Coverage

Tests 10
CRAP Score 3

Importance

Changes 0
Metric Value
dl 0
loc 13
rs 9.4285
c 0
b 0
f 0
ccs 10
cts 10
cp 1
cc 3
eloc 10
nc 2
nop 0
crap 3
1 
<?php
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namespace Gielfeldt\Iterators;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class RandomIterator implements \IteratorAggregate, \Countable

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $count;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $innerIterator;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function __construct(\Traversable $iterator, int $count)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->innerIterator = new CountableIterator($iterator, CountableIterator::CACHE_COUNT);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->count = $count;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    public function getIterator()

            


            
                                                                        
                            
            
                                    
            
            

                
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    {

            


            
                                                                        
                            
            
                                    
            
            

                
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        $innerCount = $this->innerIterator->count();

            


            
                                                                        
                            
            
                                    
            
            

                
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        $count = min($this->count, $innerCount);

            


            
                                                                        
                            
            
                                    
            
            

                
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        $indexes = [];

            


            
                                                                        
                            
            
                                    
            
            

                
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        for ($i = 0; $i < $count; $i++) {

            


            
                                                                        
                            
            
                                    
            
            

                
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            do {

            


            
                                                                        
                            
            
                                    
            
            

                
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                $index = rand(0, $innerCount - 1);

            


            
                                                                        
                            
            
                                    
            
            

                
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            } while (isset($indexes[$index]));

            


            
                                                                        
                            
            
                                    
            
            

                
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            $indexes[$index] = $index;

            


            
                                                                        
                            
            
                                    
            
            

                
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        }

            


            
                                                                        
                            
            
                                    
            
            

                
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        return new IndexIterator($this->innerIterator, $indexes);

            


            
                                                                        
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function count()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return min(count($this->innerIterator), $this->count);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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