Module jdk.scripting.nashorn
Package jdk.nashorn.api.scripting

Class NashornScriptEngineFactory

  • All Implemented Interfaces:
    ScriptEngineFactory

    public final class NashornScriptEngineFactory
extends Object
implements ScriptEngineFactory
    JSR-223 compliant script engine factory for Nashorn. The engine answers for:
    • names "nashorn", "Nashorn", "js", "JS", "JavaScript", "javascript", "ECMAScript", and "ecmascript";
    • MIME types "application/javascript", "application/ecmascript", "text/javascript", and "text/ecmascript";
    • as well as for the extension "js".
    Programs executing in engines created using getScriptEngine(String[]) will have the passed arguments accessible as a global variable named "arguments".
    Since:
    1.8u40

    • Constructor Detail

      • NashornScriptEngineFactory

        public NashornScriptEngineFactory​()

    • Method Detail

      • getEngineName

        public String getEngineName​()
        Description copied from interface: ScriptEngineFactory
        Returns the full name of the ScriptEngine. For instance an implementation based on the Mozilla Rhino Javascript engine might return Rhino Mozilla Javascript Engine.
        Specified by:
        getEngineName in interface ScriptEngineFactory
        Returns:
        The name of the engine implementation.

      • getExtensions

        public List<String> getExtensions​()
        Description copied from interface: ScriptEngineFactory
        Returns an immutable list of filename extensions, which generally identify scripts written in the language supported by this ScriptEngine. The array is used by the ScriptEngineManager to implement its getEngineByExtension method.
        Specified by:
        getExtensions in interface ScriptEngineFactory
        Returns:
        The list of extensions.

      • getLanguageName

        public String getLanguageName​()
        Description copied from interface: ScriptEngineFactory
        Returns the name of the scripting language supported by this ScriptEngine.
        Specified by:
        getLanguageName in interface ScriptEngineFactory
        Returns:
        The name of the supported language.

      • getLanguageVersion

        public String getLanguageVersion​()
        Description copied from interface: ScriptEngineFactory
        Returns the version of the scripting language supported by this ScriptEngine.
        Specified by:
        getLanguageVersion in interface ScriptEngineFactory
        Returns:
        The version of the supported language.

      • getMethodCallSyntax

        public String getMethodCallSyntax​(String obj,
                                  String method,
                                  String... args)
        Description copied from interface: ScriptEngineFactory
        Returns a String which can be used to invoke a method of a Java object using the syntax of the supported scripting language. For instance, an implementation for a Javascript engine might be; 
        
 public String getMethodCallSyntax(String obj,
                                   String m, String... args) {
      String ret = obj;
      ret += "." + m + "(";
      for (int i = 0; i < args.length; i++) {
          ret += args[i];
          if (i < args.length - 1) {
              ret += ",";
          }
      }
      ret += ")";
      return ret;
 }
        Specified by:
        getMethodCallSyntax in interface ScriptEngineFactory
        Parameters:
        obj - The name representing the object whose method is to be invoked. The name is the one used to create bindings using the put method of ScriptEngine, the put method of an ENGINE_SCOPE Bindings,or the setAttribute method of ScriptContext. The identifier used in scripts may be a decorated form of the specified one.
        method - The name of the method to invoke.
        args - names of the arguments in the method call.
        Returns:
        The String used to invoke the method in the syntax of the scripting language.

      • getMimeTypes

        public List<String> getMimeTypes​()
        Description copied from interface: ScriptEngineFactory
        Returns an immutable list of mimetypes, associated with scripts that can be executed by the engine. The list is used by the ScriptEngineManager class to implement its getEngineByMimetype method.
        Specified by:
        getMimeTypes in interface ScriptEngineFactory
        Returns:
        The list of mime types.

      • getNames

        public List<String> getNames​()
        Description copied from interface: ScriptEngineFactory
        Returns an immutable list of short names for the ScriptEngine, which may be used to identify the ScriptEngine by the ScriptEngineManager. For instance, an implementation based on the Mozilla Rhino Javascript engine might return list containing {"javascript", "rhino"}.
        Specified by:
        getNames in interface ScriptEngineFactory
        Returns:
        an immutable list of short names

      • getOutputStatement

        public String getOutputStatement​(String toDisplay)
        Description copied from interface: ScriptEngineFactory
        Returns a String that can be used as a statement to display the specified String using the syntax of the supported scripting language. For instance, the implementation for a Perl engine might be; 
        
 public String getOutputStatement(String toDisplay) {
      return "print(" + toDisplay + ")";
 }
        Specified by:
        getOutputStatement in interface ScriptEngineFactory
        Parameters:
        toDisplay - The String to be displayed by the returned statement.
        Returns:
        The string used to display the String in the syntax of the scripting language.

      • getParameter

        public Object getParameter​(String key)
        Description copied from interface: ScriptEngineFactory
        Returns the value of an attribute whose meaning may be implementation-specific. Keys for which the value is defined in all implementations are:
        • ScriptEngine.ENGINE
        • ScriptEngine.ENGINE_VERSION
        • ScriptEngine.LANGUAGE
        • ScriptEngine.LANGUAGE_VERSION
        • ScriptEngine.NAME

        The values for these keys are the Strings returned by getEngineName, getEngineVersion, getLanguageName, getLanguageVersion for the first four keys respectively. For NAME, one of the Strings returned by getNames is returned.

        A reserved key, THREADING, whose value describes the behavior of the engine with respect to concurrent execution of scripts and maintenance of state is also defined. These values for the THREADING key are:

        • null - The engine implementation is not thread safe, and cannot be used to execute scripts concurrently on multiple threads.
        • "MULTITHREADED" - The engine implementation is internally thread-safe and scripts may execute concurrently although effects of script execution on one thread may be visible to scripts on other threads.
        • "THREAD-ISOLATED" - The implementation satisfies the requirements of "MULTITHREADED", and also, the engine maintains independent values for symbols in scripts executing on different threads.
        • "STATELESS" - The implementation satisfies the requirements of "THREAD-ISOLATED". In addition, script executions do not alter the mappings in the Bindings which is the engine scope of the ScriptEngine. In particular, the keys in the Bindings and their associated values are the same before and after the execution of the script.


        Implementations may define implementation-specific keys.
        Specified by:
        getParameter in interface ScriptEngineFactory
        Parameters:
        key - The name of the parameter
        Returns:
        The value for the given parameter. Returns null if no value is assigned to the key.

      • getProgram

        public String getProgram​(String... statements)
        Description copied from interface: ScriptEngineFactory
        Returns a valid scripting language executable program with given statements. For instance an implementation for a PHP engine might be: 
        
 public String getProgram(String... statements) {
      String retval = "<?\n";
      int len = statements.length;
      for (int i = 0; i < len; i++) {
          retval += statements[i] + ";\n";
      }
      return retval += "?>";
 }
        Specified by:
        getProgram in interface ScriptEngineFactory
        Parameters:
        statements - The statements to be executed. May be return values of calls to the getMethodCallSyntax and getOutputStatement methods.
        Returns:
        The Program

      • getScriptEngine

        public ScriptEngine getScriptEngine​()
        Description copied from interface: ScriptEngineFactory
        Returns an instance of the ScriptEngine associated with this ScriptEngineFactory. A new ScriptEngine is generally returned, but implementations may pool, share or reuse engines.
        Specified by:
        getScriptEngine in interface ScriptEngineFactory
        Returns:
        A new ScriptEngine instance.

      • getScriptEngine

        public ScriptEngine getScriptEngine​(ClassLoader appLoader)
        Create a new Script engine initialized with the given class loader.
        Parameters:
        appLoader - class loader to be used as script "app" class loader.
        Returns:
        newly created script engine.
        Throws:
        SecurityException - if the security manager's checkPermission denies RuntimePermission("nashorn.setConfig")

      • getScriptEngine

        public ScriptEngine getScriptEngine​(ClassFilter classFilter)
        Create a new Script engine initialized with the given class filter.
        Parameters:
        classFilter - class filter to use.
        Returns:
        newly created script engine.
        Throws:
        NullPointerException - if classFilter is null
        SecurityException - if the security manager's checkPermission denies RuntimePermission("nashorn.setConfig")

      • getScriptEngine

        public ScriptEngine getScriptEngine​(String... args)
        Create a new Script engine initialized with the given arguments.
        Parameters:
        args - arguments array passed to script engine.
        Returns:
        newly created script engine.
        Throws:
        NullPointerException - if args is null
        SecurityException - if the security manager's checkPermission denies RuntimePermission("nashorn.setConfig")

      • getScriptEngine

        public ScriptEngine getScriptEngine​(String[] args,
                                    ClassLoader appLoader)
        Create a new Script engine initialized with the given arguments and the given class loader.
        Parameters:
        args - arguments array passed to script engine.
        appLoader - class loader to be used as script "app" class loader.
        Returns:
        newly created script engine.
        Throws:
        NullPointerException - if args is null
        SecurityException - if the security manager's checkPermission denies RuntimePermission("nashorn.setConfig")

      • getScriptEngine

        public ScriptEngine getScriptEngine​(String[] args,
                                    ClassLoader appLoader,
                                    ClassFilter classFilter)
        Create a new Script engine initialized with the given arguments, class loader and class filter.
        Parameters:
        args - arguments array passed to script engine.
        appLoader - class loader to be used as script "app" class loader.
        classFilter - class filter to use.
        Returns:
        newly created script engine.
        Throws:
        NullPointerException - if args or classFilter is null
        SecurityException - if the security manager's checkPermission denies RuntimePermission("nashorn.setConfig")