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| <h1 id="running-epsilon-from-java">Running Epsilon from Java<a class="headerlink" href="#running-epsilon-from-java" title="Permanent link">¶</a></h1> |
| <p>While Epsilon's development tools are based on Eclipse, its runtime is not, and can be used from any (headless) Java application. For example, the back-end of the <a href="../../../live">Epsilon Playground</a> is a headless, server-less Java application that runs on Google's Cloud Platform.</p> |
| <div class="admonition info"> |
| <p class="admonition-title">Did you know that ...</p> |
| <p>Contrary to popular belief, EMF is <strong>not</strong> tightly coupled to the Eclipse IDE either, and can also be embedded in any Java application by importing a couple of dependencies from <a href="https://mvnrepository.com/artifact/org.eclipse.emf">MavenCentral</a>.</p> |
| </div> |
| <h2 id="dependencies">Dependencies<a class="headerlink" href="#dependencies" title="Permanent link">¶</a></h2> |
| <p>Epsilon libraries are available on <a href="https://mvnrepository.com/artifact/org.eclipse.epsilon">MavenCentral</a>. Below is a fragment of a Maven <code>pom.xml</code> file, where we declare dependencies to the execution engine of Epsilon's <a href="../../eol">core expression language</a> and on Epsilon's driver for EMF-based models. As the EMF driver has a dependency on EMF, we don't need to declare a dependency to the EMF libraries on MavenCentral; Maven will fetch these automatically for us.</p> |
| <div class="highlight"><pre><span></span><code><span class="nt"><dependencies></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.eclipse.epsilon<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>org.eclipse.epsilon.emc.emf<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>2.2.0<span class="nt"></version></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.eclipse.epsilon<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>org.eclipse.epsilon.eol.engine<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>2.2.0<span class="nt"></version></span> |
| <span class="nt"></dependency></span> |
| ... |
| <span class="nt"></dependencies></span> |
| </code></pre></div> |
| <h2 id="parsing-and-executing-epsilon-programs">Parsing and Executing Epsilon Programs<a class="headerlink" href="#parsing-and-executing-epsilon-programs" title="Permanent link">¶</a></h2> |
| <p>Having declared a dependency to the EOL engine, parsing and executing an EOL program is as simple as that.</p> |
| <div class="highlight"><pre><span></span><code><span class="n">EolModule</span> <span class="n">module</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EolModule</span><span class="p">();</span> |
| <span class="n">module</span><span class="p">.</span><span class="na">parse</span><span class="p">(</span><span class="k">new</span> <span class="n">File</span><span class="p">(</span><span class="s">"program.eol"</span><span class="p">));</span> |
| <span class="n">module</span><span class="p">.</span><span class="na">execute</span><span class="p">();</span> |
| </code></pre></div> |
| <div class="admonition tip"> |
| <p class="admonition-title">Tip</p> |
| <p>By replacing <code>EolModule</code> with <code>EtlModule</code>, <code>EvlModule</code> etc. you can parse and execute <a href="../../etl">ETL transformations</a>, <a href="../../evl">EVL validation constraints</a> etc. <a href="../../egl">EGL</a> deviates from this pattern and if you wish to execute a single template you should use the <code>EglTemplateFactoryModuleAdapter</code> class.</p> |
| </div> |
| <h2 id="loading-models">Loading Models<a class="headerlink" href="#loading-models" title="Permanent link">¶</a></h2> |
| <p>Most of your Epsilon programs will need to run against models of some sort. To run an EOL program against a model (<code>model.xmi</code>) that conforms to a file-based Ecore metamodel (<code>metamodel.ecore</code>), you can extend the code above as follows.</p> |
| <div class="highlight"><pre><span></span><code><span class="c1">// Loads the EMF model</span> |
| <span class="n">EmfModel</span> <span class="n">model</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EmfModel</span><span class="p">();</span> |
| <span class="n">model</span><span class="p">.</span><span class="na">setMetamodelFile</span><span class="p">(</span><span class="s">"metamodel.ecore"</span><span class="p">);</span> |
| <span class="n">model</span><span class="p">.</span><span class="na">setModelFile</span><span class="p">(</span><span class="s">"model.xmi"</span><span class="p">);</span> |
| <span class="n">model</span><span class="p">.</span><span class="na">load</span><span class="p">();</span> |
| |
| <span class="c1">// Parses and executes the EOL program</span> |
| <span class="n">EolModule</span> <span class="n">module</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EolModule</span><span class="p">();</span> |
| <span class="n">module</span><span class="p">.</span><span class="na">parse</span><span class="p">(</span><span class="k">new</span> <span class="n">File</span><span class="p">(</span><span class="s">"program.eol"</span><span class="p">));</span> |
| <span class="c1">// Makes the model accessible from the program</span> |
| <span class="n">module</span><span class="p">.</span><span class="na">getContext</span><span class="p">().</span><span class="na">getModelRepository</span><span class="p">().</span><span class="na">addModel</span><span class="p">(</span><span class="n">model</span><span class="p">);</span> |
| <span class="n">module</span><span class="p">.</span><span class="na">execute</span><span class="p">();</span> |
| |
| <span class="c1">// Saves any changes to the model</span> |
| <span class="c1">// and unloads it from memory</span> |
| <span class="n">model</span><span class="p">.</span><span class="na">dispose</span><span class="p">();</span> |
| </code></pre></div> |
| <h2 id="analysing-epsilon-programs">Analysing Epsilon Programs<a class="headerlink" href="#analysing-epsilon-programs" title="Permanent link">¶</a></h2> |
| <p>As of version 2.3, Epsilon programs can be analysed using <a href="https://en.wikipedia.org/wiki/Visitor_pattern">visitors</a>. As an example, see the <code>EolUnparser</code> class which recursively visits the contents of an <code>EolModule</code> and pretty-prints it. To implement your own analyser, you will need to implement the <code>IEolVisitor</code> interface for EOL, or the respective <code>IE*lVisitor</code> interfaces for other Epsilon-based languages. Using a combination of <code>E*lUnparser</code> and your custom visitor, you can easily rewrite Epsilon programs too.</p> |
| <div class="highlight"><pre><span></span><code><span class="n">EolModule</span> <span class="n">module</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EolModule</span><span class="p">();</span> |
| <span class="n">module</span><span class="p">.</span><span class="na">parse</span><span class="p">(</span><span class="s">"'Hello world'.println();"</span><span class="p">);</span> |
| |
| <span class="n">EolUnparser</span> <span class="n">unparser</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EolUnparser</span><span class="p">();</span> |
| <span class="c1">// Prints "Hello world".println();</span> |
| <span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">unparser</span><span class="p">.</span><span class="na">unparse</span><span class="p">(</span><span class="n">module</span><span class="p">));</span> |
| </code></pre></div> |
| <h2 id="more-examples">More Examples<a class="headerlink" href="#more-examples" title="Permanent link">¶</a></h2> |
| <p>In Epsilon's Git repository, there are two example projects that show how to run <a href="https://git.eclipse.org/c/epsilon/org.eclipse.epsilon.git/tree/examples/org.eclipse.epsilon.examples.standalone">Epsilon from Java</a>, and the <a href="https://git.eclipse.org/c/epsilon/org.eclipse.epsilon.git/tree/examples/org.eclipse.epsilon.examples.workflow.standalone">ANT Epsilon tasks in a headless environment</a> (i.e. from command line).</p> |
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