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From conflue...@apache.org
Subject [CONF] Apache Cayenne Documentation: Relationships (page edited)
Date Mon, 24 Sep 2007 14:14:00 GMT
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    -->
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC">CAYDOC</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC/Relationships">Relationships</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAYDOC/Relationships">Relationships</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~andrus">Andrus
Adamchik</a>
            <span class="smallfont">(Sep 24, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=10491&originalVersion=4&revisedVersion=5">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><p>Relationships are special object properties
that reference other "related" objects. Semantically there are two types of relationships
- to-one pointing to just a single DataObjects (e.g. Painting.toArtist), and to-many pointing
to a collection of Persistent objects of the some distinct base type (e.g. Artist.paintingArray).</p>

<h3><a name="Relationships-ToOneRelationships"></a>To-One Relationships</h3>

<p>"Get" methods for to-one relationships return the target Persistent object. If the
object is not in memory yet, it will be fetched on first access. Modifying to-one relationships
is no different from modifying attributes - just a simple call to a "set" method:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Painting painting;

<span class="code-comment">// obtain artist <span class="code-keyword">for</span>
a given painting
</span>Artist originalArtist = painting.getToArtist();

<span class="code-comment">// replace with a <span class="code-keyword">new</span>
artist
</span>Artist newArtist = (Artist)context.newObject(Artist.class);
painting.setToArtist(newArtist);

<span class="code-comment">// or remove Artist at all...
</span><span class="code-comment">// painting.setToArtist(<span class="code-keyword">null</span>);</span></pre>
</div></div>
<table cellpadding='5' width='85%' cellspacing='8px' class='infoMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/information.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>When adding or removing an object from any kind of relationship, Cayenne will locate
and modify an existing reverse relationship as appropriate.</p></td></tr></table>

<h3><a name="Relationships-ToManyRelationships"></a>To-Many Relationships</h3>

<p>"Get" methods for to-many relationships return various collections of Persistent
objects. To-many relationships can be mapped as Lists (default), Collections, Sets or Maps.
Below we may refer to all four types of mappings as "collections", although strictly speaking
Map is not a Collection in Java.</p>

<p>Just like individual Persistent objects, relationship collections are also resolved
on first access (e.g. when a user tries to read an element from a collection or obtains an
Iterator). For modification there are special "addTo..." and "removeFrom..." methods:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Artist artist;

<span class="code-comment">// obtain a list of paintings
</span>List paintings = artist.getPaintingArray();

<span class="code-comment">// remove the first painting
</span><span class="code-keyword">if</span>(paintings.size() &gt; 0)
{
   Painting firstPainting = (Painting)paintings.get(0);
   artist.removeFromPaintingArray(firstPainting);
}

<span class="code-comment">// add a <span class="code-keyword">new</span>
painting
</span>Painting newPainting = (Painting)context.newObject(Painting.class);
artist.addToPaintingArray(newPainting);</pre>
</div></div>

<p>Not much difference in managing Map relationships. Let's assume that Artist's paintings
are modeled as a map, keyed by painting name:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">Artist artist;

<span class="code-comment">// obtain a map of paintings
</span>Map paintings = artist.getPaintingMap();

<span class="code-comment">// remove the painting
</span>Painting girl = (Painting) paintings.get(<span class="code-quote">"Girl"</span>);
<span class="code-keyword">if</span>(girl != <span class="code-keyword">null</span>)
{
   artist.removeFromPaintingMap(girl);
}

<span class="code-comment">// add a <span class="code-keyword">new</span>
painting
</span>Painting newPainting = (Painting)context.newObject(Painting.class);

<span class="code-comment">// must set the key property BEFORE adding to relationship
</span><span class="code-comment">// unless the key is object id:
</span>newPainting.setName(<span class="code-quote">"New Painting"</span>);

artist.addToPaintingMap(newPainting);</pre>
</div></div>

<p>Performance-wise, Maps have the most overhead of all collection options. Sets are
somewhat slower than Lists or Collections (Collections are implemented as Lists internally).
Considering that Cayenne Lists are internally managed as ordered Sets, and are not allowed
to contain the same object more than once, you may want to avoid modeling relationships as
Sets at all, unless the object public interface requirements warrant that.</p></div>


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