CollectionWriteTrait::emitOnChange() - Code Metrics - Inspection of "bugfixed for HHVM:" - Nayjest/Collection - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 0e2b97...e7d171 )

by Vitaliy

created 2016-03-01 17:23 UTC

CollectionWriteTrait::emitOnChange() A

↳ Parent: CollectionWriteTrait

Complexity

Conditions	2
Paths	2

Size

Total Lines	7
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	2

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	7
ccs	6
cts	6
cp	1
rs	9.4285
cc	2
eloc	4
nc	2
nop	1
crap	2

<?php

namespace Nayjest\Collection;

use Evenement\EventEmitterTrait;
use Traversable;

/**
 * Trait CollectionWriteTrait.
 *
 * @implements \Nayjest\Collection\CollectionWriteInterface
 */
trait CollectionWriteTrait
{
    use EventEmitterTrait;

    /**
     * used to avoid emitting multiple 'change' events in complex operations.
     * @var bool|string
     */
    protected $onChangeAlreadyEmittedBy = false;

    /**
     * Emits onChange if not emitted before.
     *
     * @param string|bool $method if false, does not require calling endEmitOnChange
     */
    protected function emitOnChange($method = false)
    {
        if (!$this->onChangeAlreadyEmittedBy) {
            $this->emit('change', [$this]);
            $this->onChangeAlreadyEmittedBy = $method;
        }
    }

    protected function endEmitOnChange($method)
    {
        if ($this->onChangeAlreadyEmittedBy === $method) {
            $this->onChangeAlreadyEmittedBy = false;
        }
    }

    /**
     * Returns reference to array storing collection items.
     *
     * @return array
     */
    abstract protected function &items();

    /**
     * Adds event listener.
     *
     * @param callable $callback callback that accepts added item and collection as argument
     * @return $this
     */
    public function onItemAdd(callable $callback)
    {
        $this->on('item.add', $callback);
        return $this;
    }

    /**
     * Adds event listener.
     *
     * @param callable $callback callback that accepts removed item and collection as argument
     * @return $this
     */
    public function onItemRemove(callable $callback)
    {
        $this->on('item.remove', $callback);
        return $this;
    }

    /**
     * Adds event listener.
     *
     * @param callable $callback callback that accepts collection instance as argument
     * @return $this
     */
    public function onChange(callable $callback)
    {
        $this->on('change', $callback);
        return $this;
    }

    /**
     * Adds item to collection.
     *
     * @param $item
     * @param bool $prepend false by default
     * @return $this
     */
    public function add($item, $prepend = false)
    {
        $this->emitOnChange();
        $this->emit('item.add', [$item, $this]);
        $items = &$this->items();
        if ($prepend) {
            array_unshift($items, $item);
        } else {
            $items[] = $item;
        }

        return $this;
    }

    /**
     * Removes items equals to specified value from collection.
     *
     * @param $item
     *
     * @return $this
     */
    public function remove($item)
    {
        $this->emitOnChange();
        $this->emit('item.remove', [$item, $this]);

        $keys = array_keys($this->items(), $item, true);
        foreach ($keys as $key) {
            unset($this->items()[$key]);
        }
        return $this;
    }

    /**
     * Replaces items equal to $oldItem to $newItem.
     *
     * If $forceAdd is true, $newItem will be added to collection even if there is no $oldItem.
     *
     * @param $oldItem
     * @param $newItem
     * @param bool $forceAdd [optional] true by default
     * @return $this
     */
    public function replace($oldItem, $newItem, $forceAdd = true)
    {
        $this->emitOnChange(__METHOD__);
        $keys = array_keys($this->items(), $oldItem, true);
        if (count($keys) === 0) {
            if ($forceAdd) {
                $this->add($newItem);
            }
        } else {
            $this->remove($oldItem);
            foreach ($keys as $key) {
                $this->add($newItem);
                // move to old item position
                $newKeys = array_keys($this->items(), $newItem, true);
                $lastAddedKey = array_pop($newKeys);
                $this->items()[$key] = $this->items()[$lastAddedKey];
                unset($this->items()[$lastAddedKey]);
            }
        }
        $this->endEmitOnChange(__METHOD__);
        return $this;
    }

    /**
     * Removes all items from collection.
     *
     * @return $this
     */
    public function clear()
    {
        $this->emitOnChange(__METHOD__);
        $items = &$this->items();
        if (count($this->listeners('item.remove'))) {
            foreach ($items as $item) {
                $this->emit('item.remove', [$item, $this]);
            }
        }

        // It's not mistake that $items never used after assigning empty array.
        // Yep, it really clears the collection.
        $items = [];
        $this->endEmitOnChange(__METHOD__);
        return $this;
    }

    /**
     * Adds multiple items to collection.
     *
     * @param array|Traversable $items
     * @param bool $prepend false by default
     *
     * @return $this
     */
    public function addMany($items, $prepend = false)
    {
        $this->emitOnChange(__METHOD__);
        if ($prepend) {
            # if items must be added to beginning, we need to reverse them
            if (!is_array($items)) {
                $items = iterator_to_array($items);
            }
            $items = array_reverse($items);
        }
        foreach ($items as $item) {
            $this->add($item, $prepend);
        }
        $this->endEmitOnChange(__METHOD__);
        return $this;
    }

    /**
     * Removes old and sets new collection items.
     *
     * @param array|Traversable $items
     *
     * @return $this
     */
    public function set($items)
    {
        $this->emitOnChange(__METHOD__);
        $this->clear();
        foreach ($items as $item) {
            $this->add($item);
        }
        $this->endEmitOnChange(__METHOD__);
        return $this;
    }

    /**
     * Creates collection of items.
     *
     * Override it if you need to implement
     * derived collection that requires specific initialization.
     *
     * @param array $items
     *
     * @return static
     */
    protected function createCollection(array $items)
    {
        $collection = new static();
        $collection->set($items);

        return $collection;
    }
}


1		<?php
2
3		namespace Nayjest\Collection;
4
5		use Evenement\EventEmitterTrait;
6		use Traversable;
7
8		/**
9		* Trait CollectionWriteTrait.
10		*
11		* @implements \Nayjest\Collection\CollectionWriteInterface
12		*/
13		trait CollectionWriteTrait
14		{
15		use EventEmitterTrait;
16
17		/**
18		* used to avoid emitting multiple 'change' events in complex operations.
19		* @var bool\|string
20		*/
21		protected $onChangeAlreadyEmittedBy = false;
22
23		/**
24		* Emits onChange if not emitted before.
25		*
26		* @param string\|bool $method if false, does not require calling endEmitOnChange
27		*/
28	32	protected function emitOnChange($method = false)
29		{
30	32	if (!$this->onChangeAlreadyEmittedBy) {
31	32	$this->emit('change', [$this]);
32	32	$this->onChangeAlreadyEmittedBy = $method;
33	32	}
34	32	}
35
36	32	protected function endEmitOnChange($method)
37		{
38	32	if ($this->onChangeAlreadyEmittedBy === $method) {
39	32	$this->onChangeAlreadyEmittedBy = false;
40	32	}
41	32	}
42
43		/**
44		* Returns reference to array storing collection items.
45		*
46		* @return array
47		*/
48		abstract protected function &items();
49
50		/**
51		* Adds event listener.
52		*
53		* @param callable $callback callback that accepts added item and collection as argument
54		* @return $this
55		*/
56	1	public function onItemAdd(callable $callback)
57		{
58	1	$this->on('item.add', $callback);
59	1	return $this;
60		}
61
62		/**
63		* Adds event listener.
64		*
65		* @param callable $callback callback that accepts removed item and collection as argument
66		* @return $this
67		*/
68	1	public function onItemRemove(callable $callback)
69		{
70	1	$this->on('item.remove', $callback);
71	1	return $this;
72		}
73
74		/**
75		* Adds event listener.
76		*
77		* @param callable $callback callback that accepts collection instance as argument
78		* @return $this
79		*/
80	1	public function onChange(callable $callback)
81		{
82	1	$this->on('change', $callback);
83	1	return $this;
84		}
85
86		/**
87		* Adds item to collection.
88		*
89		* @param $item
90		* @param bool $prepend false by default
91		* @return $this
92		*/
93	32	public function add($item, $prepend = false)
94		{
95	32	$this->emitOnChange();
96	32	$this->emit('item.add', [$item, $this]);
97	32	$items = &$this->items();
98	32	if ($prepend) {
99		array_unshift($items, $item);
100		} else {
101	32	$items[] = $item;
102		}
103
104	32	return $this;
105		}
106
107		/**
108		* Removes items equals to specified value from collection.
109		*
110		* @param $item
111		*
112		* @return $this
113		*/
114	2	public function remove($item)
115		{
116	2	$this->emitOnChange();
117	2	$this->emit('item.remove', [$item, $this]);
118
119	2	$keys = array_keys($this->items(), $item, true);
120	2	foreach ($keys as $key) {
121	2	unset($this->items()[$key]);
122	2	}
123	2	return $this;
124		}
125
126		/**
127		* Replaces items equal to $oldItem to $newItem.
128		*
129		* If $forceAdd is true, $newItem will be added to collection even if there is no $oldItem.
130		*
131		* @param $oldItem
132		* @param $newItem
133		* @param bool $forceAdd [optional] true by default
134		* @return $this
135		*/
136		public function replace($oldItem, $newItem, $forceAdd = true)
137		{
138		$this->emitOnChange(__METHOD__);
139		$keys = array_keys($this->items(), $oldItem, true);
140		if (count($keys) === 0) {
141		if ($forceAdd) {
142		$this->add($newItem);
143		}
144		} else {
145		$this->remove($oldItem);
146		foreach ($keys as $key) {
147		$this->add($newItem);
148		// move to old item position
149		$newKeys = array_keys($this->items(), $newItem, true);
150		$lastAddedKey = array_pop($newKeys);
151		$this->items()[$key] = $this->items()[$lastAddedKey];
152		unset($this->items()[$lastAddedKey]);
153		}
154		}
155		$this->endEmitOnChange(__METHOD__);
156		return $this;
157		}
158
159		/**
160		* Removes all items from collection.
161		*
162		* @return $this
163		*/
164	32	public function clear()
165		{
166	32	$this->emitOnChange(__METHOD__);
167	32	$items = &$this->items();
168	32	if (count($this->listeners('item.remove'))) {
169	1	foreach ($items as $item) {
170	1	$this->emit('item.remove', [$item, $this]);
171	1	}
172	1	}
173
174		// It's not mistake that $items never used after assigning empty array.
175		// Yep, it really clears the collection.
176	32	$items = [];
177	32	$this->endEmitOnChange(__METHOD__);
178	32	return $this;
179		}
180
181		/**
182		* Adds multiple items to collection.
183		*
184		* @param array\|Traversable $items
185		* @param bool $prepend false by default
186		*
187		* @return $this
188		*/
189		public function addMany($items, $prepend = false)
190		{
191		$this->emitOnChange(__METHOD__);
192		if ($prepend) {
193		# if items must be added to beginning, we need to reverse them
194		if (!is_array($items)) {
195		$items = iterator_to_array($items);
196		}
197		$items = array_reverse($items);
198		}
199		foreach ($items as $item) {
200		$this->add($item, $prepend);
201		}
202		$this->endEmitOnChange(__METHOD__);
203		return $this;
204		}
205
206		/**
207		* Removes old and sets new collection items.
208		*
209		* @param array\|Traversable $items
210		*
211		* @return $this
212		*/
213	32	public function set($items)
214		{
215	32	$this->emitOnChange(__METHOD__);
216	32	$this->clear();
217	32	foreach ($items as $item) {
218	32	$this->add($item);
219	32	}
220	32	$this->endEmitOnChange(__METHOD__);
221	32	return $this;
222		}
223
224		/**
225		* Creates collection of items.
226		*
227		* Override it if you need to implement
228		* derived collection that requires specific initialization.
229		*
230		* @param array $items
231		*
232		* @return static
233		*/
234	2	protected function createCollection(array $items)
235		{
236	2	$collection = new static();
237	2	$collection->set($items);
238
239	2	return $collection;
240		}
241		}
242

Nayjest / Collection

Push — master ( 0e2b97...e7d171 )

CollectionWriteTrait::emitOnChange() A

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