| <!DOCTYPE html> |
| <html lang="en"> |
| <head> |
| |
| |
| <title>Apache Jena - Inside assemblers</title> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| |
| <link href="/css/bootstrap.min.css" rel="stylesheet" media="screen"> |
| <link href="/css/bootstrap-icons.css" rel="stylesheet" media="screen"><link rel="stylesheet" type="text/css" href="https://jena.apache.org/sass/jena.1b17c39a117e22b46db4c66f6395dc27c134a60377d87d2d5745b8600eb69722.css" integrity="sha256-GxfDmhF+IrRttMZvY5XcJ8E0pgN32H0tV0W4YA62lyI="> |
| <link rel="shortcut icon" href="/images/favicon.ico" /> |
| |
| </head> |
| |
| <body> |
| |
| <nav class="navbar navbar-expand-lg bg-body-tertiary" role="navigation"> |
| <div class="container"> |
| <div class="navbar-header"> |
| <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> |
| <span class="navbar-toggler-icon"></span> |
| </button> |
| <a class="navbar-brand" href="/index.html"> |
| <img class="logo-menu" src="/images/jena-logo/jena-logo-notext-small.png" alt="jena logo">Apache Jena</a> |
| </div> |
| |
| <div class="collapse navbar-collapse" id="navbarNav"> |
| <ul class="navbar-nav me-auto mb-2 mb-lg-0"> |
| <li id="homepage" class="nav-item"><a class="nav-link" href="/index.html"><span class="bi-house"></span> Home</a></li> |
| <li id="download" class="nav-item"><a class="nav-link" href="/download/index.cgi"><span class="bi-download"></span> Download</a></li> |
| <li class="nav-item dropdown"> |
| <a href="#" class="nav-link dropdown-toggle" role="button" data-bs-toggle="dropdown" aria-expanded="false"><span class="bi-journal"></span> Learn <b class="caret"></b></a> |
| <ul class="dropdown-menu"> |
| <li class="dropdown-header">Tutorials</li> |
| <li><a class="dropdown-item" href="/tutorials/index.html">Overview</a></li> |
| <li><a class="dropdown-item" href="/documentation/fuseki2/index.html">Fuseki Triplestore</a></li> |
| <li><a class="dropdown-item" href="/documentation/notes/index.html">How-To's</a></li> |
| <li><a class="dropdown-item" href="/documentation/query/manipulating_sparql_using_arq.html">Manipulating SPARQL using ARQ</a></li> |
| <li><a class="dropdown-item" href="/tutorials/rdf_api.html">RDF core API tutorial</a></li> |
| <li><a class="dropdown-item" href="/tutorials/sparql.html">SPARQL tutorial</a></li> |
| <li><a class="dropdown-item" href="/tutorials/using_jena_with_eclipse.html">Using Jena with Eclipse</a></li> |
| <li class="dropdown-divider"></li> |
| <li class="dropdown-header">References</li> |
| <li><a class="dropdown-item" href="/documentation/index.html">Overview</a></li> |
| <li><a class="dropdown-item" href="/documentation/query/index.html">ARQ (SPARQL)</a></li> |
| <li><a class="dropdown-item" href="/documentation/io/">RDF I/O</a></li> |
| <li><a class="dropdown-item" href="/documentation/assembler/index.html">Assembler</a></li> |
| <li><a class="dropdown-item" href="/documentation/tools/index.html">Command-line tools</a></li> |
| <li><a class="dropdown-item" href="/documentation/rdfs/">Data with RDFS Inferencing</a></li> |
| <li><a class="dropdown-item" href="/documentation/geosparql/index.html">GeoSPARQL</a></li> |
| <li><a class="dropdown-item" href="/documentation/inference/index.html">Inference API</a></li> |
| <li><a class="dropdown-item" href="/documentation/ontology/">Ontology API</a></li> |
| <li><a class="dropdown-item" href="/documentation/permissions/index.html">Permissions</a></li> |
| <li><a class="dropdown-item" href="/documentation/extras/querybuilder/index.html">Query Builder</a></li> |
| <li><a class="dropdown-item" href="/documentation/rdf/index.html">RDF API</a></li> |
| <li><a class="dropdown-item" href="/documentation/rdfconnection/">RDF Connection - SPARQL API</a></li> |
| <li><a class="dropdown-item" href="/documentation/rdfstar/index.html">RDF-star</a></li> |
| <li><a class="dropdown-item" href="/documentation/shacl/index.html">SHACL</a></li> |
| <li><a class="dropdown-item" href="/documentation/shex/index.html">ShEx</a></li> |
| <li><a class="dropdown-item" href="/documentation/tdb/index.html">TDB</a></li> |
| <li><a class="dropdown-item" href="/documentation/tdb2/index.html">TDB2</a></li> |
| <li><a class="dropdown-item" href="/documentation/query/text-query.html">Text Search</a></li> |
| </ul> |
| </li> |
| |
| <li class="nav-item dropdown"> |
| <a href="#" class="nav-link dropdown-toggle" role="button" data-bs-toggle="dropdown" aria-expanded="false"><span class="bi-journal-code"></span> Javadoc <b class="caret"></b></a> |
| <ul class="dropdown-menu"> |
| <li><a class="dropdown-item" href="/documentation/javadoc.html">All Javadoc</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/arq/">ARQ</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/fuseki2/">Fuseki</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/geosparql/">GeoSPARQL</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/jena/">Jena Core</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/permissions/">Permissions</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/extras/querybuilder/">Query Builder</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/shacl/">SHACL</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/tdb/">TDB</a></li> |
| <li><a class="dropdown-item" href="/documentation/javadoc/text/">Text Search</a></li> |
| </ul> |
| </li> |
| </ul> |
| <form class="d-flex" role="search" action="/search" method="GET"> |
| <div class="input-group"> |
| <input class="form-control border-end-0 border m-0" type="search" name="q" id="search-query" placeholder="Search...." aria-label="Search" style="width: 10rem;"> |
| <button class="btn btn-outline-secondary border-start-0 border" type="submit"> |
| <i class="bi-search"></i> |
| </button> |
| </div> |
| </form> |
| <ul class="navbar-nav"> |
| <li id="ask" class="nav-item"><a class="nav-link" href="/help_and_support/index.html" title="Ask"><span class="bi-patch-question"></span><span class="text-body d-none d-xxl-inline"> Ask</span></a></li> |
| |
| <li class="nav-item dropdown"> |
| <a href="#" title="Get involved" class="nav-link dropdown-toggle" role="button" data-bs-toggle="dropdown" aria-expanded="false"><span class="bi-megaphone"></span><span class="text-body d-none d-xxl-inline"> Get involved </span><b class="caret"></b></a> |
| <ul class="dropdown-menu"> |
| <li><a class="dropdown-item" href="/getting_involved/index.html">Contribute</a></li> |
| <li><a class="dropdown-item" href="/help_and_support/bugs_and_suggestions.html">Report a bug</a></li> |
| <li class="dropdown-divider"></li> |
| <li class="dropdown-header">Project</li> |
| <li><a class="dropdown-item" href="/about_jena/about.html">About Jena</a></li> |
| <li><a class="dropdown-item" href="/about_jena/architecture.html">Architecture</a></li> |
| <li><a class="dropdown-item" href="/about_jena/citing.html">Citing</a></li> |
| <li><a class="dropdown-item" href="/about_jena/team.html">Project team</a></li> |
| <li><a class="dropdown-item" href="/about_jena/contributions.html">Related projects</a></li> |
| <li><a class="dropdown-item" href="/about_jena/roadmap.html">Roadmap</a></li> |
| <li><a class="dropdown-item" href="/about_jena/security-advisories.html">Security Advisories</a></li> |
| <li class="dropdown-divider"></li> |
| <li class="dropdown-header">ASF</li> |
| <li><a class="dropdown-item" href="https://www.apache.org/">Apache Software Foundation</a></li> |
| <li><a class="dropdown-item" href="https://www.apache.org/foundation/sponsorship.html">Become a Sponsor</a></li> |
| <li><a class="dropdown-item" href="https://www.apache.org/licenses/LICENSE-2.0">License</a></li> |
| <li><a class="dropdown-item" href="https://www.apache.org/security/">Security</a></li> |
| <li><a class="dropdown-item" href="https://www.apache.org/foundation/thanks.html">Thanks</a></li> |
| </ul> |
| </li> |
| |
| |
| |
| |
| <li class="nav-item" id="edit"><a class="nav-link" href="https://github.com/apache/jena-site/edit/main/source/documentation/assembler/inside-assemblers.md" title="Edit this page on GitHub"><span class="bi-pencil-square"></span><span class="text-body d-none d-xxl-inline"> Edit this page</span></a></li> |
| </ul> |
| </div> |
| </div> |
| </nav> |
| |
| <div class="container"> |
| <div class="row"> |
| <div class="col-md-12"> |
| |
| <div id="breadcrumbs"> |
|
|
|
|
|
|
|
|
|
|
|
|
| <ol class="breadcrumb mt-4 p-2 bg-body-tertiary">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| <li class="breadcrumb-item"><a href='/documentation'>DOCUMENTATION</a></li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| <li class="breadcrumb-item"><a href='/documentation/assembler'>ASSEMBLER</a></li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| <li class="breadcrumb-item active">INSIDE ASSEMBLERS</li>
|
|
|
|
|
|
|
|
|
| </ol>
|
|
|
|
|
|
|
| |
| </div> |
| <h1 class="title">Inside assemblers</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
| |
| <aside class="text-muted align-self-start mb-3 p-0 d-xl-none d-block"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#the-assembler-interface">The Assembler interface</a></li> |
| <li><a href="#builtin-assemblers">Builtin assemblers</a></li> |
| <li><a href="#inside-assemblers">Inside Assemblers</a></li> |
| <li><a href="#implementing-your-own-assemblers">Implementing your own assemblers</a></li> |
| <li><a href="#basic-assemblers">basic assemblers</a> |
| <ul> |
| <li><a href="#basic-assembler-contentassembler">Basic assembler ContentAssembler</a></li> |
| <li><a href="#basic-assembler-rulesetassembler">Basic assembler RulesetAssembler</a></li> |
| <li><a href="#basic-assembler-defaultmodelassembler">Basic assembler DefaultModelAssembler</a></li> |
| <li><a href="#assemblergroup">AssemblerGroup</a></li> |
| <li><a href="#loading-assembler-classes">Loading assembler classes</a></li> |
| </ul> |
| </li> |
| </ul> |
| </nav> |
| </aside> |
| <article class="flex-column me-lg-4"> |
| <p>This document describes Jena’s built-in assembler classes and how |
| to write and integrate your own assemblers. If you just need a |
| quick guide to the common model specifications, see the |
| <a href="index.html">assembler quickstart</a>; if you want more details on |
| writing assembler descriptions, see the |
| <a href="assembler-howto.html">assembler howto</a>.</p> |
| <h2 id="the-assembler-interface">The Assembler interface</h2> |
| <p>An <code>Assembler</code> is an object that builds objects (most importantly, |
| <code>Model</code>s) from RDF descriptions.</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">public</span> Object <span style="color:#00a000">open</span><span style="color:#666">(</span> Assembler a<span style="color:#666">,</span> Resource root<span style="color:#666">,</span> Mode mode <span style="color:#666">);</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">public</span> Object <span style="color:#00a000">open</span><span style="color:#666">(</span> Assembler a<span style="color:#666">,</span> Resource root <span style="color:#666">);</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">public</span> Object <span style="color:#00a000">open</span><span style="color:#666">(</span> Resource root <span style="color:#666">);</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">public</span> Model <span style="color:#00a000">openModel</span><span style="color:#666">(</span> Resource root <span style="color:#666">);</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">public</span> Model <span style="color:#00a000">openModel</span><span style="color:#666">(</span> Resource root<span style="color:#666">,</span> Mode mode <span style="color:#666">);</span> |
| </span></span></code></pre></div><p>The fundamental method is the first: all the others are shorthands |
| for ways of calling it. The abstract class <code>AssemblerBase</code> |
| implements <code>Assembler</code> leaving only that method abstract and |
| defining the others in terms of it.</p> |
| <p>The definition of <code>a.open(Assembler sub, Resource root, Mode mode)</code> |
| is that <code>a</code> will construct the object described by the properties |
| of <code>root</code>. If this requires the construction of sub-objects from |
| descriptions hanging off <code>root</code>, <code>sub.open</code> is to be used to |
| construct those. If the object is to be constructed in some |
| persistent store, <code>mode</code> defines whether objects can be re-used or |
| created: see <a href="#modes">modes</a> for more details.</p> |
| <h2 id="builtin-assemblers">Builtin assemblers</h2> |
| <p>Jena comes with a collection of built-in assemblers: various |
| <em>basic assemblers</em> and a composite <em>general assembler</em>. Each of |
| these assemblers has a constant instance declared as a field of |
| <code>Assembler</code>.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Assembler</th> |
| <th>Result class</th> |
| <th>Type constant</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><em>Temporarily omitted as the source got scrambled by the Markdown import</em> <strong>TODO</strong></td> |
| <td></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <h2 id="inside-assemblers">Inside Assemblers</h2> |
| <p><code>Assembler.general</code> is a particular implementation of the |
| <code>Assembler</code> interface. An <code>Assembler</code> knows how to build the |
| objects - not just models - described by an Assembler |
| specification. The normal route into an Assembler is through the |
| method:</p> |
| <ul> |
| <li>open( Resource root ) ? Object</li> |
| </ul> |
| <p>The Assembler inspects the <code>root</code> resource properties and decides |
| whether it can build an object with that description. If not, it |
| throws an exception. Otherwise, it constructs and returns a |
| suitable object. |
| Since the creation of Models is the reason for the existence of |
| Assemblers, there is a convenience wrapper method:</p> |
| <ul> |
| <li>openModel( Resource root ) ? Model</li> |
| </ul> |
| <p>which constructs the object and checks that it’s a Model before |
| returning it. |
| When an <code>Assembler</code> requires sub-objects (for example, when an |
| InfModel Assembler requires a Reasoner object), it uses the |
| method:</p> |
| <ul> |
| <li>open( Assembler sub, Resource root ) ? Model</li> |
| </ul> |
| <p>passing in a suitable Assembler object. In fact the standard |
| implementation of <code>open(root)</code> is just</p> |
| <ul> |
| <li>open( this, root )</li> |
| </ul> |
| <p>passing in itself as the sub-assembler and having |
| <code>open(Assembler,Resource)</code> be the place where all the work is done. |
| (Amongst other things, this makes testing easier.) |
| When working with named persistent objects (typically database |
| models), sometimes you need to control whether new objects should |
| be constructed or old models can be reused. There is an additional |
| method</p> |
| <ul> |
| <li>open( Assembler sub, Resource root, Mode mode )</li> |
| </ul> |
| <p>where the <code>Mode</code> argument controls the creation (or not) of |
| persistent models. The mode is passed down to all sub-object |
| creation. The standard implementation of <code>open(sub,root)</code> is just:</p> |
| <ul> |
| <li>open( sub, root, Mode.DEFAULT )</li> |
| </ul> |
| <p>A <code>Mode</code> object has two methods:</p> |
| <ul> |
| <li>permitCreateNew( Resource root, String name )</li> |
| <li>permitUseExisting( Resource root, String name )</li> |
| </ul> |
| <p><code>root</code> is the root resource describing the object to be created or |
| reused, and <code>name</code> is the name given to it. The result is <code>true</code> |
| iff the permission is granted. <code>Mode.DEFAULT</code> permits the reuse of |
| existing objects and denies the creation of new ones. |
| There are four <code>Mode constants:</code></p> |
| <ul> |
| <li>Mode.DEFAULT - reuse existing objects</li> |
| <li>Mode.CREATE - create missing objects</li> |
| <li>Mode.REUSE - reuse existing objects</li> |
| <li>Mode.ANY - reuse existing objects, create missing ones</li> |
| </ul> |
| <p>Since the <code>Mode</code> methods are passed the resource root and name, the |
| user can write specialised <code>Mode</code>s that look at the name or the |
| other root properties to make their decision. |
| Note that the Modes only apply to persistent objects, so <em>eg</em> |
| MemoryModels or PrefixMappings ignore their Mode arguments.</p> |
| <h2 id="implementing-your-own-assemblers">Implementing your own assemblers</h2> |
| <p>(Temporary documentation pasted in from email; will be integrated |
| and made nice RSN.)</p> |
| <pre><code>You have to implement the Assembler interface, most straightforwardly |
| done by subclassing AssemblerBase and overriding |
| |
| public Object open( Assembler a, Resource root, Mode mode ); |
| |
| because AssemblerBase both implements the boring methods that are |
| just specialisations of `open` and provides some utility methods |
| such as getting the values of unique properties. The arguments are |
| |
| * a -- the assembler to use for any sub-assemblies |
| * root -- the resource in the assembler description for this object |
| * mode -- the persistent open vs create mode |
| |
| The pattern is to look for the known properties of the root, use |
| those to define any sub-objects of the object you're assembling |
| (including using `a` for anything that's itself a structured |
| object) and then constructing a new result object from those |
| components. |
| |
| Then you attach this new assembler object to its type in some |
| AssemblerGroup using that group's `implementWith` method. You |
| can attach it to the handy-but-public-and-shared group |
| `Assembler.general` or you can construct your own group. The |
| point about an AssemblerGroup is that it does the type-to-assembler |
| mapping for you -- and when an AssemblerGroup calls a component |
| assembler's `open` method, it passes /itself/ in as the `a` argument, |
| so that the invoked assembler has access to all of the component |
| assemblers of the Group. |
| </code></pre> |
| <h2 id="basic-assemblers">basic assemblers</h2> |
| <p>There is a family of <em>basic assemblers</em>, each of which knows how to |
| assemble a specific kind of object so long as they’re given an |
| Assembler that can construct their sub-objects. There are defined |
| constants in <code>Assembler</code> for (an instance of) each of these basic |
| assembler classes.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>produces</th> |
| <th>Class</th> |
| <th>Type</th> |
| <th>constant</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>default models</td> |
| <td>DefaultModelAssembler</td> |
| <td>ja:DefaultModel</td> |
| <td>defaultModel</td> |
| </tr> |
| <tr> |
| <td>memory models</td> |
| <td>MemoryModelAssembler</td> |
| <td>ja:MemoryModel</td> |
| <td>memoryModel</td> |
| </tr> |
| <tr> |
| <td>inference models</td> |
| <td>InfModelAssembler</td> |
| <td>ja:InfModel</td> |
| <td>infModel</td> |
| </tr> |
| <tr> |
| <td>reasoners</td> |
| <td>ReasonerAssembler</td> |
| <td>ja:Reasoner</td> |
| <td>reasoner</td> |
| </tr> |
| <tr> |
| <td>content</td> |
| <td>ContentAssembler</td> |
| <td>ja:Content</td> |
| <td>content</td> |
| </tr> |
| <tr> |
| <td>ontology models</td> |
| <td>OntModelAssembler</td> |
| <td>ja:OntModel</td> |
| <td>ontModel</td> |
| </tr> |
| <tr> |
| <td>rules</td> |
| <td>RuleSetAssembler</td> |
| <td>ja:RuleSet</td> |
| <td>rules</td> |
| </tr> |
| <tr> |
| <td>union models</td> |
| <td>UnionModelAssembler</td> |
| <td>ja:UnionModel</td> |
| <td>unionModel</td> |
| </tr> |
| <tr> |
| <td>prefix mappings</td> |
| <td>PrefixMappingAssembler</td> |
| <td>ja:PrefixMapping</td> |
| <td>prefixMapping</td> |
| </tr> |
| <tr> |
| <td>file models</td> |
| <td>FileModelAssembler</td> |
| <td>ja:FileModel</td> |
| <td>fileModel</td> |
| </tr> |
| </tbody> |
| </table> |
| <p><code>Assembler.general</code> is an <em>assembler group</em>, which ties together |
| those basic assemblers. <code>general</code> can be extended by Jena coders if |
| required. Jena components that use Assembler specifications to |
| construct objects will use <code>general</code> unless documented otherwise.</p> |
| <p>In the remaining sections we will discuss the <code>Assembler</code> classes |
| that return non-Model objects and conclude with a description of |
| <code>AssemblerGroup</code>.</p> |
| <h3 id="basic-assembler-contentassembler">Basic assembler ContentAssembler</h3> |
| <p>The ContentAssembler constructs Content objects (using the |
| <code>ja:Content</code> vocabulary) used to supply content to models. A |
| Content object has the method:</p> |
| <ul> |
| <li>fill( Model m ) ? m</li> |
| </ul> |
| <p>Invoking the <code>fill</code> method adds the represented content to the |
| model. The supplied ModelAssemblers automatically apply the |
| <code>Content</code> objects corresponding to <code>ja:content</code> property values.</p> |
| <h3 id="basic-assembler-rulesetassembler">Basic assembler RulesetAssembler</h3> |
| <p>A RulesetAssembler generates lists of Jena rules.</p> |
| <h3 id="basic-assembler-defaultmodelassembler">Basic assembler DefaultModelAssembler</h3> |
| <p>A “default model” is a model of unspecified type which is |
| implemented as whatever kind the assembler for <code>ja:DefaultModel</code> |
| generates. The default for a DefaultModel is to create a |
| MemoryModel with no special properties.</p> |
| <h3 id="assemblergroup">AssemblerGroup</h3> |
| <p>The AssemblerGroup class allows a bunch of other Assemblers to be |
| bundled together and selected by RDF type. AssemblerGroup |
| implements Assembler and adds the methods:</p> |
| <ul> |
| <li>implementWith( Resource type, Assembler a ) ? this</li> |
| <li>assemblerFor( Resource type ) ? Assembler</li> |
| </ul> |
| <p>AssemblerGroup’s implementation of <code>open(sub,root)</code> finds the |
| <em>most specific type</em> of <code>root</code> that is a subclass of <code>ja:Object</code> |
| and looks for the Assembler that has been associated with that type |
| by a call of <code>implementWith</code>. It then delegates construction to |
| that Assembler, passing <em>itself</em> as the sub-assembler. Hence each |
| component Assembler only needs to know how to assemble its own |
| particular objects.</p> |
| <p>The <code>assemblerFor</code> method returns the assembler associated with the |
| argument type by a previous call of <code>implementWith</code>, or <code>null</code> if |
| there is no associated assembler.</p> |
| <h3 id="loading-assembler-classes">Loading assembler classes</h3> |
| <p>AssemblerGroups implement the <code>ja:assembler</code> functionality. The |
| object of an <code>(type ja:assembler "ClassName")</code> statement is a |
| string which is taken as the name of an <code>Assembler</code> implementation |
| to load. An instance of that class is associated with <code>type</code> using |
| <code>implementWith</code>.</p> |
| <p>If the class has a constructor that takes a single <code>Resource</code> |
| object, that constructor is used to initialise the class, passing |
| in the <code>type</code> subject of the triple. Otherwise the no-argument |
| constructor of the class is used.</p> |
| |
| </article> |
| |
| <aside class="text-muted align-self-start mb-3 mb-xl-5 p-0 d-none d-xl-flex flex-column sticky-top"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#the-assembler-interface">The Assembler interface</a></li> |
| <li><a href="#builtin-assemblers">Builtin assemblers</a></li> |
| <li><a href="#inside-assemblers">Inside Assemblers</a></li> |
| <li><a href="#implementing-your-own-assemblers">Implementing your own assemblers</a></li> |
| <li><a href="#basic-assemblers">basic assemblers</a> |
| <ul> |
| <li><a href="#basic-assembler-contentassembler">Basic assembler ContentAssembler</a></li> |
| <li><a href="#basic-assembler-rulesetassembler">Basic assembler RulesetAssembler</a></li> |
| <li><a href="#basic-assembler-defaultmodelassembler">Basic assembler DefaultModelAssembler</a></li> |
| <li><a href="#assemblergroup">AssemblerGroup</a></li> |
| <li><a href="#loading-assembler-classes">Loading assembler classes</a></li> |
| </ul> |
| </li> |
| </ul> |
| </nav> |
| </aside> |
| </main> |
| |
| </div> |
| </div> |
| </div> |
| |
| <footer class="bd-footer py-4 py-md-5 mt-4 mt-lg-5 bg-body-tertiary"> |
| <div class="container" style="font-size:80%" > |
| <p> |
| Copyright © 2011–2024 The Apache Software Foundation, Licensed under the |
| <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>. |
| </p> |
| <p> |
| Apache Jena, Jena, the Apache Jena project logo, Apache and the Apache feather logos are trademarks of |
| The Apache Software Foundation. |
| <br/> |
| <a href="https://privacy.apache.org/policies/privacy-policy-public.html" |
| >Apache Software Foundation Privacy Policy</a>. |
| </p> |
| </div> |
| </footer> |
| |
| <script src="/js/popper.min.js.js" type="text/javascript"></script> |
| <script src="/js/bootstrap.min.js" type="text/javascript"></script> |
| <script src="/js/improve.js" type="text/javascript"></script> |
| |
| <script type="text/javascript"> |
| (function() { |
| 'use strict' |
| |
| |
| |
| const links = document.querySelectorAll(`a[href="${window.location.pathname}"]`) |
| if (links !== undefined && links !== null) { |
| for (const link of links) { |
| |
| link.classList.add('active') |
| let parentElement = link.parentElement |
| let count = 0 |
| const levelsLimit = 4 |
| |
| |
| |
| |
| |
| while (['UL', 'LI'].includes(parentElement.tagName) && count <= levelsLimit) { |
| if (parentElement.tagName === 'LI') { |
| |
| |
| |
| parentElement.querySelector('a:first-child').classList.add('active') |
| } |
| parentElement = parentElement.parentElement |
| count++ |
| } |
| } |
| } |
| })() |
| </script> |
| |
| </body> |
| </html> |
