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Dynamic scripting for the JVM

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package org.snapscript.studio.agent.runtime;

import static org.snapscript.studio.agent.runtime.RuntimeAttribute.VERSION;

import java.util.jar.Attributes;
import java.util.jar.Manifest;

public class VersionValue extends ManifestValue {

   private static final String IMPLEMENTATION_VERSION = "Implementation-Version";
   private static final String DEFAULT_VERSION = "1.0";

   @Override
   public String getName() {
      return VERSION.name;
   }

   @Override
   public String getValue() {
      Attributes.Name key = new Attributes.Name(IMPLEMENTATION_VERSION);
      Manifest manifest = getManifest();
      String version = (String)manifest.getMainAttributes().get(key);

      return version == null ? DEFAULT_VERSION : version;
   }
}