Java compact1, compact2, compact3 javax.script Class AbstractScriptEngine（JDK8）

Field Detail

• context

  protected ScriptContext context

  The default ScriptContext of this AbstractScriptEngine.

Constructor Detail

• AbstractScriptEngine

  public AbstractScriptEngine()

  Creates a new instance of AbstractScriptEngine using a SimpleScriptContext as its default ScriptContext.

• AbstractScriptEngine

  public AbstractScriptEngine(Bindings n)

  Creates a new instance using the specified Bindings as the ENGINE_SCOPE Bindings in the protected context field.

  Parameters:

  n - The specified Bindings.

  Throws:

  NullPointerException - if n is null.

Method Detail

• setContext

  public void setContext(ScriptContext ctxt)

  Sets the value of the protected context field to the specified ScriptContext.

  Specified by:

  setContext in interface ScriptEngine

  Parameters:

  ctxt - The specified ScriptContext.

  Throws:

  NullPointerException - if ctxt is null.

• getContext

  public ScriptContext getContext()

  Returns the value of the protected context field.

  Specified by:

  getContext in interface ScriptEngine

  Returns:

  The value of the protected context field.

• getBindings

  public Bindings getBindings(int scope)

  Returns the Bindings with the specified scope value in the protected context field.

  Specified by:

  getBindings in interface ScriptEngine

  Parameters:

  scope - The specified scope

  Returns:

  The corresponding Bindings.

  Throws:

  IllegalArgumentException - if the value of scope is invalid for the type the protected context field.

• setBindings

  public void setBindings(Bindings bindings,
                          int scope)

  Sets the Bindings with the corresponding scope value in the context field.

  Specified by:

  setBindings in interface ScriptEngine

  Parameters:

  bindings - The specified Bindings.

  scope - The specified scope.

  Throws:

  IllegalArgumentException - if the value of scope is invalid for the type the context field.

  NullPointerException - if the bindings is null and the scope is ScriptContext.ENGINE_SCOPE

• put

  public void put(String key,
                  Object value)

  Sets the specified value with the specified key in the ENGINE_SCOPE Bindings of the protected context field.

  Specified by:

  put in interface ScriptEngine

  Parameters:

  key - The specified key.

  value - The specified value.

  Throws:

  NullPointerException - if key is null.

  IllegalArgumentException - if key is empty.

• get

  public Object get(String key)

  Gets the value for the specified key in the ENGINE_SCOPE of the protected context field.

  Specified by:

  get in interface ScriptEngine

  Parameters:

  key - The key whose value is to be returned

  Returns:

  The value for the specified key.

  Throws:

  NullPointerException - if key is null.

  IllegalArgumentException - if key is empty.

• eval

  public Object eval(Reader reader,
                     Bindings bindings)
              throws ScriptException

  eval(Reader, Bindings) calls the abstract eval(Reader, ScriptContext) method, passing it a ScriptContext whose Reader, Writers and Bindings for scopes other that ENGINE_SCOPE are identical to those members of the protected context field. The specified Bindings is used instead of the ENGINE_SCOPE Bindings of the context field.

  Specified by:

  eval in interface ScriptEngine

  Parameters:

  reader - A Reader containing the source of the script.

  bindings - A Bindings to use for the ENGINE_SCOPE while the script executes.

  Returns:

  The return value from eval(Reader, ScriptContext)

  Throws:

  ScriptException - if an error occurs in script.

  NullPointerException - if any of the parameters is null.

• eval

  public Object eval(String script,
                     Bindings bindings)
              throws ScriptException

  Same as eval(Reader, Bindings) except that the abstract eval(String, ScriptContext) is used.

  Specified by:

  eval in interface ScriptEngine

  Parameters:

  script - A String containing the source of the script.

  bindings - A Bindings to use as the ENGINE_SCOPE while the script executes.

  Returns:

  The return value from eval(String, ScriptContext)

  Throws:

  ScriptException - if an error occurs in script.

  NullPointerException - if any of the parameters is null.

• eval

  public Object eval(Reader reader)
              throws ScriptException

  eval(Reader) calls the abstract eval(Reader, ScriptContext) passing the value of the context field.

  Specified by:

  eval in interface ScriptEngine

  Parameters:

  reader - A Reader containing the source of the script.

  Returns:

  The return value from eval(Reader, ScriptContext)

  Throws:

  ScriptException - if an error occurs in script.

  NullPointerException - if any of the parameters is null.

• eval

  public Object eval(String script)
              throws ScriptException

  Same as eval(Reader) except that the abstract eval(String, ScriptContext) is used.

  Specified by:

  eval in interface ScriptEngine

  Parameters:

  script - A String containing the source of the script.

  Returns:

  The return value from eval(String, ScriptContext)

  Throws:

  ScriptException - if an error occurs in script.

  NullPointerException - if any of the parameters is null.

• getScriptContext

  protected ScriptContext getScriptContext(Bindings nn)

  Returns a SimpleScriptContext. The SimpleScriptContext:
  
  

  • Uses the specified Bindings for its ENGINE_SCOPE
  • Uses the Bindings returned by the abstract getGlobalScope method as its GLOBAL_SCOPE
  • Uses the Reader and Writer in the default ScriptContext of this ScriptEngine

  
  
  A SimpleScriptContext returned by this method is used to implement eval methods using the abstract eval(Reader,Bindings) and eval(String,Bindings) versions.

  Parameters:

  nn - Bindings to use for the ENGINE_SCOPE

  Returns:

  The SimpleScriptContext