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< ? php
/*
* This file is part of the Symfony package .
*
* ( c ) Fabien Potencier < fabien @ symfony . com >
*
* For the full copyright and license information , please view the LICENSE
* file that was distributed with this source code .
*/
namespace Symfony\Component\PropertyAccess ;
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use Symfony\Component\PropertyAccess\Exception\AccessException ;
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use Symfony\Component\PropertyAccess\Exception\NoSuchPropertyException ;
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use Symfony\Component\PropertyAccess\Exception\NoSuchIndexException ;
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use Symfony\Component\PropertyAccess\Exception\UnexpectedTypeException ;
/**
* Default implementation of { @ link PropertyAccessorInterface } .
*
* @ author Bernhard Schussek < bschussek @ gmail . com >
*/
class PropertyAccessor implements PropertyAccessorInterface
{
const VALUE = 0 ;
const IS_REF = 1 ;
[property-access] Improvement for Accessing Reference Chain
Improve performance for the following scenarios:
- Example 1:
```php
$a = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
);
$pa->setValue($a, '[a][b][c]', 'new-value');
// The PropertyAccessor will try to set values for
// $a['a']['b']['c'], $a['a']['b'] and $a['a'],
// but in fact it may terminate the loop
// right after the value of $a[a][b][c] is set,
// because $a, $[a], $[a][b] and $[a][b][c]
// are all passed as reference - the reference chain is not broken.
```
- Example 2
```php
$b = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
)
$a = new Foo($b);
// In this example, the reference chain of $b is broken,
// because it's passed to $a.value as value
// But its elements are all passed as reference,
// so after setting the value for $b[a][b][c], there is no need
// to set value for $b[a][b] and $b[a]
$pa->setValue($a, 'value[a][b][c]', 'new-value');
```
| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
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const IS_REF_CHAINED = 2 ;
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/**
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* @ var bool
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*/
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private $magicCall ;
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/**
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* @ var bool
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*/
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private $ignoreInvalidIndices ;
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/**
* Should not be used by application code . Use
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* { @ link PropertyAccess :: createPropertyAccessor ()} instead .
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*/
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public function __construct ( $magicCall = false , $throwExceptionOnInvalidIndex = false )
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{
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$this -> magicCall = $magicCall ;
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$this -> ignoreInvalidIndices = ! $throwExceptionOnInvalidIndex ;
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}
/**
* { @ inheritdoc }
*/
public function getValue ( $objectOrArray , $propertyPath )
{
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if ( ! $propertyPath instanceof PropertyPathInterface ) {
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$propertyPath = new PropertyPath ( $propertyPath );
}
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$propertyValues = & $this -> readPropertiesUntil ( $objectOrArray , $propertyPath , $propertyPath -> getLength (), $this -> ignoreInvalidIndices );
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return $propertyValues [ count ( $propertyValues ) - 1 ][ self :: VALUE ];
}
/**
* { @ inheritdoc }
*/
public function setValue ( & $objectOrArray , $propertyPath , $value )
{
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if ( ! $propertyPath instanceof PropertyPathInterface ) {
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$propertyPath = new PropertyPath ( $propertyPath );
}
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$propertyValues = & $this -> readPropertiesUntil ( $objectOrArray , $propertyPath , $propertyPath -> getLength () - 1 );
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// Add the root object to the list
array_unshift ( $propertyValues , array (
self :: VALUE => & $objectOrArray ,
self :: IS_REF => true ,
[property-access] Improvement for Accessing Reference Chain
Improve performance for the following scenarios:
- Example 1:
```php
$a = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
);
$pa->setValue($a, '[a][b][c]', 'new-value');
// The PropertyAccessor will try to set values for
// $a['a']['b']['c'], $a['a']['b'] and $a['a'],
// but in fact it may terminate the loop
// right after the value of $a[a][b][c] is set,
// because $a, $[a], $[a][b] and $[a][b][c]
// are all passed as reference - the reference chain is not broken.
```
- Example 2
```php
$b = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
)
$a = new Foo($b);
// In this example, the reference chain of $b is broken,
// because it's passed to $a.value as value
// But its elements are all passed as reference,
// so after setting the value for $b[a][b][c], there is no need
// to set value for $b[a][b] and $b[a]
$pa->setValue($a, 'value[a][b][c]', 'new-value');
```
| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
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self :: IS_REF_CHAINED => true ,
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));
for ( $i = count ( $propertyValues ) - 1 ; $i >= 0 ; -- $i ) {
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$objectOrArray = & $propertyValues [ $i ][ self :: VALUE ];
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$property = $propertyPath -> getElement ( $i );
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[property-access] Improvement for Accessing Reference Chain
Improve performance for the following scenarios:
- Example 1:
```php
$a = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
);
$pa->setValue($a, '[a][b][c]', 'new-value');
// The PropertyAccessor will try to set values for
// $a['a']['b']['c'], $a['a']['b'] and $a['a'],
// but in fact it may terminate the loop
// right after the value of $a[a][b][c] is set,
// because $a, $[a], $[a][b] and $[a][b][c]
// are all passed as reference - the reference chain is not broken.
```
- Example 2
```php
$b = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
)
$a = new Foo($b);
// In this example, the reference chain of $b is broken,
// because it's passed to $a.value as value
// But its elements are all passed as reference,
// so after setting the value for $b[a][b][c], there is no need
// to set value for $b[a][b] and $b[a]
$pa->setValue($a, 'value[a][b][c]', 'new-value');
```
| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
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// You only need set value for current element if:
// 1. it's the parent of the last index element
// OR
// 2. its child is not passed by reference
//
// This may avoid uncessary value setting process for array elements.
// For example:
// '[a][b][c]' => 'old-value'
// If you want to change its value to 'new-value',
// you only need set value for '[a][b][c]' and it's safe to ignore '[a][b]' and '[a]'
//
if ( $i === count ( $propertyValues ) - 1 || ! $propertyValues [ $i + 1 ][ self :: IS_REF ]) {
if ( $propertyPath -> isIndex ( $i )) {
$this -> writeIndex ( $objectOrArray , $property , $value );
} else {
$this -> writeProperty ( $objectOrArray , $property , $value );
}
// if current element is an object
// OR
// if current element's reference chain is not broken - current element
// as well as all its ancients in the property path are all passed by reference,
// then there is no need to continue the value setting process
if ( is_object ( $propertyValues [ $i ][ self :: VALUE ]) || $propertyValues [ $i ][ self :: IS_REF_CHAINED ]) {
return ;
}
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}
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$value = & $objectOrArray ;
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}
}
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/**
* { @ inheritdoc }
*/
public function isReadable ( $objectOrArray , $propertyPath )
{
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if ( ! $propertyPath instanceof PropertyPathInterface ) {
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$propertyPath = new PropertyPath ( $propertyPath );
}
try {
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$this -> readPropertiesUntil ( $objectOrArray , $propertyPath , $propertyPath -> getLength (), $this -> ignoreInvalidIndices );
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return true ;
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} catch ( AccessException $e ) {
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return false ;
} catch ( UnexpectedTypeException $e ) {
return false ;
}
}
/**
* { @ inheritdoc }
*/
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public function isWritable ( $objectOrArray , $propertyPath )
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{
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if ( ! $propertyPath instanceof PropertyPathInterface ) {
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$propertyPath = new PropertyPath ( $propertyPath );
}
try {
$propertyValues = $this -> readPropertiesUntil ( $objectOrArray , $propertyPath , $propertyPath -> getLength () - 1 );
// Add the root object to the list
array_unshift ( $propertyValues , array (
self :: VALUE => $objectOrArray ,
self :: IS_REF => true ,
[property-access] Improvement for Accessing Reference Chain
Improve performance for the following scenarios:
- Example 1:
```php
$a = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
);
$pa->setValue($a, '[a][b][c]', 'new-value');
// The PropertyAccessor will try to set values for
// $a['a']['b']['c'], $a['a']['b'] and $a['a'],
// but in fact it may terminate the loop
// right after the value of $a[a][b][c] is set,
// because $a, $[a], $[a][b] and $[a][b][c]
// are all passed as reference - the reference chain is not broken.
```
- Example 2
```php
$b = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
)
$a = new Foo($b);
// In this example, the reference chain of $b is broken,
// because it's passed to $a.value as value
// But its elements are all passed as reference,
// so after setting the value for $b[a][b][c], there is no need
// to set value for $b[a][b] and $b[a]
$pa->setValue($a, 'value[a][b][c]', 'new-value');
```
| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
2015-08-03 08:13:18 +01:00
self :: IS_REF_CHAINED => true ,
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));
for ( $i = count ( $propertyValues ) - 1 ; $i >= 0 ; -- $i ) {
$objectOrArray = $propertyValues [ $i ][ self :: VALUE ];
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$property = $propertyPath -> getElement ( $i );
if ( $propertyPath -> isIndex ( $i )) {
if ( ! $objectOrArray instanceof \ArrayAccess && ! is_array ( $objectOrArray )) {
return false ;
}
} else {
if ( ! $this -> isPropertyWritable ( $objectOrArray , $property )) {
return false ;
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}
}
[property-access] Improvement for Accessing Reference Chain
Improve performance for the following scenarios:
- Example 1:
```php
$a = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
);
$pa->setValue($a, '[a][b][c]', 'new-value');
// The PropertyAccessor will try to set values for
// $a['a']['b']['c'], $a['a']['b'] and $a['a'],
// but in fact it may terminate the loop
// right after the value of $a[a][b][c] is set,
// because $a, $[a], $[a][b] and $[a][b][c]
// are all passed as reference - the reference chain is not broken.
```
- Example 2
```php
$b = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
)
$a = new Foo($b);
// In this example, the reference chain of $b is broken,
// because it's passed to $a.value as value
// But its elements are all passed as reference,
// so after setting the value for $b[a][b][c], there is no need
// to set value for $b[a][b] and $b[a]
$pa->setValue($a, 'value[a][b][c]', 'new-value');
```
| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
2015-08-03 08:13:18 +01:00
if ( is_object ( $propertyValues [ $i ][ self :: VALUE ]) || $propertyValues [ $i ][ self :: IS_REF_CHAINED ]) {
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return true ;
}
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}
return true ;
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} catch ( AccessException $e ) {
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return false ;
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} catch ( UnexpectedTypeException $e ) {
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return false ;
}
}
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/**
* Reads the path from an object up to a given path index .
*
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* @ param object | array $objectOrArray The object or array to read from
* @ param PropertyPathInterface $propertyPath The property path to read
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* @ param int $lastIndex The index up to which should be read
* @ param bool $ignoreInvalidIndices Whether to ignore invalid indices
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* or throw an exception
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*
* @ return array The values read in the path .
*
* @ throws UnexpectedTypeException If a value within the path is neither object nor array .
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* @ throws NoSuchIndexException If a non - existing index is accessed
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*/
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private function & readPropertiesUntil ( & $objectOrArray , PropertyPathInterface $propertyPath , $lastIndex , $ignoreInvalidIndices = true )
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{
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if ( ! is_object ( $objectOrArray ) && ! is_array ( $objectOrArray )) {
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throw new UnexpectedTypeException ( $objectOrArray , $propertyPath , 0 );
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}
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$propertyValues = array ();
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for ( $i = 0 ; $i < $lastIndex ; ++ $i ) {
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$property = $propertyPath -> getElement ( $i );
$isIndex = $propertyPath -> isIndex ( $i );
// Create missing nested arrays on demand
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if ( $isIndex &&
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(
( $objectOrArray instanceof \ArrayAccess && ! isset ( $objectOrArray [ $property ])) ||
( is_array ( $objectOrArray ) && ! array_key_exists ( $property , $objectOrArray ))
)
) {
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if ( ! $ignoreInvalidIndices ) {
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if ( ! is_array ( $objectOrArray )) {
if ( ! $objectOrArray instanceof \Traversable ) {
throw new NoSuchIndexException ( sprintf (
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'Cannot read index "%s" while trying to traverse path "%s".' ,
$property ,
( string ) $propertyPath
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));
}
$objectOrArray = iterator_to_array ( $objectOrArray );
}
throw new NoSuchIndexException ( sprintf (
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'Cannot read index "%s" while trying to traverse path "%s". Available indices are "%s".' ,
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$property ,
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( string ) $propertyPath ,
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print_r ( array_keys ( $objectOrArray ), true )
));
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}
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$objectOrArray [ $property ] = $i + 1 < $propertyPath -> getLength () ? array () : null ;
}
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if ( $isIndex ) {
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$propertyValue = & $this -> readIndex ( $objectOrArray , $property );
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} else {
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$propertyValue = & $this -> readProperty ( $objectOrArray , $property );
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}
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$objectOrArray = & $propertyValue [ self :: VALUE ];
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// the final value of the path must not be validated
if ( $i + 1 < $propertyPath -> getLength () && ! is_object ( $objectOrArray ) && ! is_array ( $objectOrArray )) {
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throw new UnexpectedTypeException ( $objectOrArray , $propertyPath , $i + 1 );
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}
[property-access] Improvement for Accessing Reference Chain
Improve performance for the following scenarios:
- Example 1:
```php
$a = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
);
$pa->setValue($a, '[a][b][c]', 'new-value');
// The PropertyAccessor will try to set values for
// $a['a']['b']['c'], $a['a']['b'] and $a['a'],
// but in fact it may terminate the loop
// right after the value of $a[a][b][c] is set,
// because $a, $[a], $[a][b] and $[a][b][c]
// are all passed as reference - the reference chain is not broken.
```
- Example 2
```php
$b = array(
'a' => array(
'b' => array(
'c' => 'old-value'
)
)
)
$a = new Foo($b);
// In this example, the reference chain of $b is broken,
// because it's passed to $a.value as value
// But its elements are all passed as reference,
// so after setting the value for $b[a][b][c], there is no need
// to set value for $b[a][b] and $b[a]
$pa->setValue($a, 'value[a][b][c]', 'new-value');
```
| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
2015-08-03 08:13:18 +01:00
// Set the IS_REF_CHAINED flag to true if:
// current property is passed by reference and
// it is the first element in the property path or
// the IS_REF_CHAINED flag of its parent element is true
// Basically, this flag is true only when the reference chain from the top element to current element is not broken
$propertyValue [ self :: IS_REF_CHAINED ] = $propertyValue [ self :: IS_REF ] && ( $i == 0 || $propertyValues [ $i - 1 ][ self :: IS_REF_CHAINED ]);
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$propertyValues [] = & $propertyValue ;
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}
return $propertyValues ;
}
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/**
* Reads a key from an array - like structure .
*
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* @ param \ArrayAccess | array $array The array or \ArrayAccess object to read from
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* @ param string | int $index The key to read
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*
* @ return mixed The value of the key
*
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* @ throws NoSuchIndexException If the array does not implement \ArrayAccess or it is not an array
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*/
private function & readIndex ( & $array , $index )
{
if ( ! $array instanceof \ArrayAccess && ! is_array ( $array )) {
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throw new NoSuchIndexException ( sprintf ( 'Cannot read index "%s" from object of type "%s" because it doesn\'t implement \ArrayAccess.' , $index , get_class ( $array )));
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}
// Use an array instead of an object since performance is very crucial here
$result = array (
self :: VALUE => null ,
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self :: IS_REF => false ,
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);
if ( isset ( $array [ $index ])) {
if ( is_array ( $array )) {
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$result [ self :: VALUE ] = & $array [ $index ];
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$result [ self :: IS_REF ] = true ;
} else {
$result [ self :: VALUE ] = $array [ $index ];
// Objects are always passed around by reference
$result [ self :: IS_REF ] = is_object ( $array [ $index ]) ? true : false ;
}
}
return $result ;
}
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/**
* Reads the a property from an object or array .
*
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* @ param object $object The object to read from .
* @ param string $property The property to read .
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*
* @ return mixed The value of the read property
*
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* @ throws NoSuchPropertyException If the property does not exist or is not
* public .
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*/
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private function & readProperty ( & $object , $property )
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{
// Use an array instead of an object since performance is
// very crucial here
$result = array (
self :: VALUE => null ,
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self :: IS_REF => false ,
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);
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if ( ! is_object ( $object )) {
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throw new NoSuchPropertyException ( sprintf ( 'Cannot read property "%s" from an array. Maybe you intended to write the property path as "[%s]" instead.' , $property , $property ));
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}
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$camelized = $this -> camelize ( $property );
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$reflClass = new \ReflectionClass ( $object );
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$getter = 'get' . $camelized ;
$getsetter = lcfirst ( $camelized ); // jQuery style, e.g. read: last(), write: last($item)
$isser = 'is' . $camelized ;
$hasser = 'has' . $camelized ;
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$classHasProperty = $reflClass -> hasProperty ( $property );
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if ( $reflClass -> hasMethod ( $getter ) && $reflClass -> getMethod ( $getter ) -> isPublic ()) {
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$result [ self :: VALUE ] = $object -> $getter ();
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} elseif ( $this -> isMethodAccessible ( $reflClass , $getsetter , 0 )) {
$result [ self :: VALUE ] = $object -> $getsetter ();
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} elseif ( $reflClass -> hasMethod ( $isser ) && $reflClass -> getMethod ( $isser ) -> isPublic ()) {
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$result [ self :: VALUE ] = $object -> $isser ();
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} elseif ( $reflClass -> hasMethod ( $hasser ) && $reflClass -> getMethod ( $hasser ) -> isPublic ()) {
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$result [ self :: VALUE ] = $object -> $hasser ();
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} elseif ( $classHasProperty && $reflClass -> getProperty ( $property ) -> isPublic ()) {
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$result [ self :: VALUE ] = & $object -> $property ;
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$result [ self :: IS_REF ] = true ;
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} elseif ( $reflClass -> hasMethod ( '__get' ) && $reflClass -> getMethod ( '__get' ) -> isPublic ()) {
$result [ self :: VALUE ] = $object -> $property ;
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} elseif ( ! $classHasProperty && property_exists ( $object , $property )) {
// Needed to support \stdClass instances. We need to explicitly
// exclude $classHasProperty, otherwise if in the previous clause
// a *protected* property was found on the class, property_exists()
// returns true, consequently the following line will result in a
// fatal error.
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$result [ self :: VALUE ] = & $object -> $property ;
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$result [ self :: IS_REF ] = true ;
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} elseif ( $this -> magicCall && $reflClass -> hasMethod ( '__call' ) && $reflClass -> getMethod ( '__call' ) -> isPublic ()) {
// we call the getter and hope the __call do the job
$result [ self :: VALUE ] = $object -> $getter ();
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} else {
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$methods = array ( $getter , $getsetter , $isser , $hasser , '__get' );
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if ( $this -> magicCall ) {
$methods [] = '__call' ;
}
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throw new NoSuchPropertyException ( sprintf (
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'Neither the property "%s" nor one of the methods "%s()" ' .
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'exist and have public access in class "%s".' ,
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$property ,
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implode ( '()", "' , $methods ),
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$reflClass -> name
));
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}
// Objects are always passed around by reference
if ( is_object ( $result [ self :: VALUE ])) {
$result [ self :: IS_REF ] = true ;
}
return $result ;
}
/**
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* Sets the value of an index in a given array - accessible value .
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*
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* @ param \ArrayAccess | array $array An array or \ArrayAccess object to write to
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* @ param string | int $index The index to write at
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* @ param mixed $value The value to write
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*
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* @ throws NoSuchIndexException If the array does not implement \ArrayAccess or it is not an array
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*/
private function writeIndex ( & $array , $index , $value )
{
if ( ! $array instanceof \ArrayAccess && ! is_array ( $array )) {
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throw new NoSuchIndexException ( sprintf ( 'Cannot modify index "%s" in object of type "%s" because it doesn\'t implement \ArrayAccess' , $index , get_class ( $array )));
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}
$array [ $index ] = $value ;
}
/**
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* Sets the value of a property in the given object .
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*
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* @ param object $object The object to write to
* @ param string $property The property to write
* @ param mixed $value The value to write
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*
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* @ throws NoSuchPropertyException If the property does not exist or is not
* public .
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*/
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private function writeProperty ( & $object , $property , $value )
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{
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if ( ! is_object ( $object )) {
throw new NoSuchPropertyException ( sprintf ( 'Cannot write property "%s" to an array. Maybe you should write the property path as "[%s]" instead?' , $property , $property ));
}
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$reflClass = new \ReflectionClass ( $object );
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$camelized = $this -> camelize ( $property );
$singulars = ( array ) StringUtil :: singularify ( $camelized );
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if ( is_array ( $value ) || $value instanceof \Traversable ) {
$methods = $this -> findAdderAndRemover ( $reflClass , $singulars );
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// Use addXxx() and removeXxx() to write the collection
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if ( null !== $methods ) {
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$this -> writeCollection ( $object , $property , $value , $methods [ 0 ], $methods [ 1 ]);
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return ;
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}
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}
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$setter = 'set' . $camelized ;
$getsetter = lcfirst ( $camelized ); // jQuery style, e.g. read: last(), write: last($item)
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$classHasProperty = $reflClass -> hasProperty ( $property );
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if ( $this -> isMethodAccessible ( $reflClass , $setter , 1 )) {
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$object -> $setter ( $value );
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} elseif ( $this -> isMethodAccessible ( $reflClass , $getsetter , 1 )) {
$object -> $getsetter ( $value );
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} elseif ( $classHasProperty && $reflClass -> getProperty ( $property ) -> isPublic ()) {
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$object -> $property = $value ;
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} elseif ( $this -> isMethodAccessible ( $reflClass , '__set' , 2 )) {
$object -> $property = $value ;
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} elseif ( ! $classHasProperty && property_exists ( $object , $property )) {
// Needed to support \stdClass instances. We need to explicitly
// exclude $classHasProperty, otherwise if in the previous clause
// a *protected* property was found on the class, property_exists()
// returns true, consequently the following line will result in a
// fatal error.
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$object -> $property = $value ;
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} elseif ( $this -> magicCall && $this -> isMethodAccessible ( $reflClass , '__call' , 2 )) {
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// we call the getter and hope the __call do the job
$object -> $setter ( $value );
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} else {
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throw new NoSuchPropertyException ( sprintf (
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'Neither the property "%s" nor one of the methods %s"%s()", "%s()", ' .
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'"__set()" or "__call()" exist and have public access in class "%s".' ,
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$property ,
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implode ( '' , array_map ( function ( $singular ) {
return '"add' . $singular . '()"/"remove' . $singular . '()", ' ;
}, $singulars )),
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$setter ,
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$getsetter ,
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$reflClass -> name
));
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}
}
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/**
* Adjusts a collection - valued property by calling add * () and remove * ()
* methods .
*
* @ param object $object The object to write to
* @ param string $property The property to write
* @ param array | \Traversable $collection The collection to write
* @ param string $addMethod The add * () method
* @ param string $removeMethod The remove * () method
*/
private function writeCollection ( $object , $property , $collection , $addMethod , $removeMethod )
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{
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// At this point the add and remove methods have been found
// Use iterator_to_array() instead of clone in order to prevent side effects
// see https://github.com/symfony/symfony/issues/4670
$itemsToAdd = is_object ( $collection ) ? iterator_to_array ( $collection ) : $collection ;
$itemToRemove = array ();
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$propertyValue = & $this -> readProperty ( $object , $property );
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$previousValue = $propertyValue [ self :: VALUE ];
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// remove reference to avoid modifications
unset ( $propertyValue );
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if ( is_array ( $previousValue ) || $previousValue instanceof \Traversable ) {
foreach ( $previousValue as $previousItem ) {
foreach ( $collection as $key => $item ) {
if ( $item === $previousItem ) {
// Item found, don't add
unset ( $itemsToAdd [ $key ]);
// Next $previousItem
continue 2 ;
}
}
// Item not found, add to remove list
$itemToRemove [] = $previousItem ;
}
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}
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foreach ( $itemToRemove as $item ) {
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$object -> { $removeMethod }( $item );
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}
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foreach ( $itemsToAdd as $item ) {
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$object -> { $addMethod }( $item );
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}
}
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/**
* Returns whether a property is writable in the given object .
*
* @ param object $object The object to write to
* @ param string $property The property to write
*
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* @ return bool Whether the property is writable
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*/
private function isPropertyWritable ( $object , $property )
{
if ( ! is_object ( $object )) {
return false ;
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}
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$reflClass = new \ReflectionClass ( $object );
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$camelized = $this -> camelize ( $property );
$setter = 'set' . $camelized ;
$getsetter = lcfirst ( $camelized ); // jQuery style, e.g. read: last(), write: last($item)
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$classHasProperty = $reflClass -> hasProperty ( $property );
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if ( $this -> isMethodAccessible ( $reflClass , $setter , 1 )
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|| $this -> isMethodAccessible ( $reflClass , $getsetter , 1 )
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|| $this -> isMethodAccessible ( $reflClass , '__set' , 2 )
|| ( $classHasProperty && $reflClass -> getProperty ( $property ) -> isPublic ())
|| ( ! $classHasProperty && property_exists ( $object , $property ))
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|| ( $this -> magicCall && $this -> isMethodAccessible ( $reflClass , '__call' , 2 ))) {
return true ;
}
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$singulars = ( array ) StringUtil :: singularify ( $camelized );
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// Any of the two methods is required, but not yet known
if ( null !== $this -> findAdderAndRemover ( $reflClass , $singulars )) {
return true ;
}
return false ;
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}
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/**
* Camelizes a given string .
*
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* @ param string $string Some string
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*
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* @ return string The camelized version of the string
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*/
private function camelize ( $string )
{
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return strtr ( ucwords ( strtr ( $string , array ( '_' => ' ' ))), array ( ' ' => '' ));
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}
/**
* Searches for add and remove methods .
*
* @ param \ReflectionClass $reflClass The reflection class for the given object
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* @ param array $singulars The singular form of the property name or null
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*
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* @ return array | null An array containing the adder and remover when found , null otherwise
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*/
private function findAdderAndRemover ( \ReflectionClass $reflClass , array $singulars )
{
foreach ( $singulars as $singular ) {
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$addMethod = 'add' . $singular ;
$removeMethod = 'remove' . $singular ;
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$addMethodFound = $this -> isMethodAccessible ( $reflClass , $addMethod , 1 );
$removeMethodFound = $this -> isMethodAccessible ( $reflClass , $removeMethod , 1 );
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if ( $addMethodFound && $removeMethodFound ) {
return array ( $addMethod , $removeMethod );
}
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}
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}
/**
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* Returns whether a method is public and has the number of required parameters .
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*
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* @ param \ReflectionClass $class The class of the method
* @ param string $methodName The method name
* @ param int $parameters The number of parameters
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*
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* @ return bool Whether the method is public and has $parameters
* required parameters
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*/
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private function isMethodAccessible ( \ReflectionClass $class , $methodName , $parameters )
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{
if ( $class -> hasMethod ( $methodName )) {
$method = $class -> getMethod ( $methodName );
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if ( $method -> isPublic ()
&& $method -> getNumberOfRequiredParameters () <= $parameters
&& $method -> getNumberOfParameters () >= $parameters ) {
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return true ;
}
}
return false ;
}
}