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| <h2 title="Interface NCValueLoader" class="title">Interface NCValueLoader</h2> |
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| <pre>public interface <span class="typeNameLabel">NCValueLoader</span> |
| extends <a href="NCLifecycle.html" title="interface in org.apache.nlpcraft.model">NCLifecycle</a></pre> |
| <div class="block">Dynamic value loader that can be used by model elements to dynamically load or create their values. Note that |
| the primary use case for this interface is the dynamic value loading for the models defines in JSON/YAML |
| presentation. However, it's not technically limited to that use case only, and this interface can be |
| set programmatically when model elements are created programmatically too. |
| <p> |
| <b>JSON</b> |
| <br> |
| When using JSON/YAML model presentation element values can be defined statically. However, in some |
| cases, it is required to load these values from external sources like database or REST services while |
| keeping the rest of the model declaration static (i.e. in JSON/YAML). To accomplish this you can |
| define <code>valueLoader</code> property and provide a fully qualified class name that implements |
| this interface. During the model instantiation an instance of that class will be created once per |
| each model and class of loader and method <a href="#load(org.apache.nlpcraft.model.NCElement)"><code>load(NCElement)</code></a> will be called to load |
| element's values. Note that you can use both statically defined values (i.e. <code>values</code> property) |
| and dynamically loaded values together and they will be merged: |
| <pre class="brush: js, highlight: [11]"> |
| "elements": [ |
| { |
| "id": "my:id", |
| "description": "My description.", |
| "values": [ |
| { |
| "name": "name1", |
| "synonyms": ["syn1", "syn2"] |
| } |
| ], |
| "valueLoader": "my.package.MyLoader" |
| } |
| ] |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a><<a href="NCValue.html" title="interface in org.apache.nlpcraft.model">NCValue</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#load(org.apache.nlpcraft.model.NCElement)">load</a></span>​(<a href="NCElement.html" title="interface in org.apache.nlpcraft.model">NCElement</a> owner)</code></th> |
| <td class="colLast"> |
| <div class="block">Loads values for given model element.</div> |
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| <h3>Methods inherited from interface org.apache.nlpcraft.model.<a href="NCLifecycle.html" title="interface in org.apache.nlpcraft.model">NCLifecycle</a></h3> |
| <code><a href="NCLifecycle.html#onDiscard()">onDiscard</a>, <a href="NCLifecycle.html#onInit()">onInit</a></code></li> |
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| <h4>load</h4> |
| <pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a><<a href="NCValue.html" title="interface in org.apache.nlpcraft.model">NCValue</a>> load​(<a href="NCElement.html" title="interface in org.apache.nlpcraft.model">NCElement</a> owner)</pre> |
| <div class="block">Loads values for given model element.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>owner</code> - Model element to which this value loader belongs to.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Set of values, potentially empty but never <code>null</code>.</dd> |
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