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<div class="section" id="implementing-arrayaccess-for-domain-objects">
<h1>Implementing ArrayAccess for Domain Objects<a class="headerlink" href="#implementing-arrayaccess-for-domain-objects" title="Permalink to this headline"></a></h1>
<p><em>Section author: Roman Borschel (<a class="reference external" href="mailto:roman&#37;&#52;&#48;code-factory&#46;org">roman<span>&#64;</span>code-factory<span>&#46;</span>org</a>)</em></p>
<p>This recipe will show you how to implement ArrayAccess for your
domain objects in order to allow more uniform access, for example
in templates. In these examples we will implement ArrayAccess on a
<a class="reference external" href="http://martinfowler.com/eaaCatalog/layerSupertype.html">Layer Supertype</a>
for all our domain objects.</p>
<div class="section" id="option-1">
<h2>Option 1<a class="headerlink" href="#option-1" title="Permalink to this headline"></a></h2>
<p>In this implementation we will make use of PHPs highly dynamic
nature to dynamically access properties of a subtype in a supertype
at runtime. Note that this implementation has 2 main caveats:</p>
<ul class="simple">
<li>It will not work with private fields</li>
<li>It will not go through any getters/setters</li>
</ul>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">abstract</span> <span class="k">class</span> <span class="nc">DomainObject</span> <span class="k">implements</span> <span class="nx">ArrayAccess</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetExists</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="nb">isset</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="nv">$offset</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetSet</span><span class="p">(</span><span class="nv">$offset</span><span class="p">,</span> <span class="nv">$value</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="nv">$offset</span> <span class="o">=</span> <span class="nv">$value</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetGet</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="nv">$offset</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetUnset</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="nv">$offset</span> <span class="o">=</span> <span class="k">null</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="option-2">
<h2>Option 2<a class="headerlink" href="#option-2" title="Permalink to this headline"></a></h2>
<p>In this implementation we will dynamically invoke getters/setters.
Again we use PHPs dynamic nature to invoke methods on a subtype
from a supertype at runtime. This implementation has the following
caveats:</p>
<ul class="simple">
<li>It relies on a naming convention</li>
<li>The semantics of offsetExists can differ</li>
<li>offsetUnset will not work with typehinted setters</li>
</ul>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">abstract</span> <span class="k">class</span> <span class="nc">DomainObject</span> <span class="k">implements</span> <span class="nx">ArrayAccess</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetExists</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="c1">// In this example we say that exists means it is not null</span>
<span class="nv">$value</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="p">{</span><span class="s2">&quot;get</span><span class="si">$offset</span><span class="s2">&quot;</span><span class="p">}();</span>
<span class="k">return</span> <span class="nv">$value</span> <span class="o">!==</span> <span class="k">null</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetSet</span><span class="p">(</span><span class="nv">$offset</span><span class="p">,</span> <span class="nv">$value</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="p">{</span><span class="s2">&quot;set</span><span class="si">$offset</span><span class="s2">&quot;</span><span class="p">}(</span><span class="nv">$value</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetGet</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="p">{</span><span class="s2">&quot;get</span><span class="si">$offset</span><span class="s2">&quot;</span><span class="p">}();</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetUnset</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="p">{</span><span class="s2">&quot;set</span><span class="si">$offset</span><span class="s2">&quot;</span><span class="p">}(</span><span class="k">null</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="read-only">
<h2>Read-only<a class="headerlink" href="#read-only" title="Permalink to this headline"></a></h2>
<p>You can slightly tweak option 1 or option 2 in order to make array
access read-only. This will also circumvent some of the caveats of
each option. Simply make offsetSet and offsetUnset throw an
exception (i.e. BadMethodCallException).</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">abstract</span> <span class="k">class</span> <span class="nc">DomainObject</span> <span class="k">implements</span> <span class="nx">ArrayAccess</span>
<span class="p">{</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetExists</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="c1">// option 1 or option 2</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetSet</span><span class="p">(</span><span class="nv">$offset</span><span class="p">,</span> <span class="nv">$value</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nx">BadMethodCallException</span><span class="p">(</span><span class="s2">&quot;Array access of class &quot;</span> <span class="o">.</span> <span class="nb">get_class</span><span class="p">(</span><span class="nv">$this</span><span class="p">)</span> <span class="o">.</span> <span class="s2">&quot; is read-only!&quot;</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetGet</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="c1">// option 1 or option 2</span>
<span class="p">}</span>
<span class="k">public</span> <span class="k">function</span> <span class="nf">offsetUnset</span><span class="p">(</span><span class="nv">$offset</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">throw</span> <span class="k">new</span> <span class="nx">BadMethodCallException</span><span class="p">(</span><span class="s2">&quot;Array access of class &quot;</span> <span class="o">.</span> <span class="nb">get_class</span><span class="p">(</span><span class="nv">$this</span><span class="p">)</span> <span class="o">.</span> <span class="s2">&quot; is read-only!&quot;</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
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<h3><a href="../index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Implementing ArrayAccess for Domain Objects</a><ul>
<li><a class="reference internal" href="#option-1">Option 1</a></li>
<li><a class="reference internal" href="#option-2">Option 2</a></li>
<li><a class="reference internal" href="#read-only">Read-only</a></li>
</ul>
</li>
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