org.molgenis.js.JsScriptExecutor Maven / Gradle / Ivy

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package org.molgenis.js;

import static java.util.Objects.requireNonNull;

import javax.script.ScriptException;
import org.molgenis.js.nashorn.NashornScriptEngine;
import org.springframework.stereotype.Service;

/** Executes a JavaScript */
@Service
class JsScriptExecutor {
  private final NashornScriptEngine jsScriptEngine;

  public JsScriptExecutor(NashornScriptEngine jsScriptEngine) {
    this.jsScriptEngine = requireNonNull(jsScriptEngine);
  }

  /**
   * Executes the given JavaScript, e.g. 'var product = 2 * 3; return product;'
   *
   * @param jsScript JavaScript
   * @return value of which the type depends on the JavaScript type of the returned variable
   */
  Object executeScript(String jsScript) {
    String jsScriptWithFunction = "(function (){" + jsScript + "})();";
    try {
      return jsScriptEngine.eval(jsScriptWithFunction);
    } catch (ScriptException e) {
      throw new org.molgenis.script.core.ScriptException(e);
    }
  }
}